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/*
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* Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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# include "incls/_precompiled.incl"
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# include "incls/_thread.cpp.incl"
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#ifdef DTRACE_ENABLED
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// Only bother with this argument setup if dtrace is available
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HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin);
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HS_DTRACE_PROBE_DECL(hotspot, vm__init__end);
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HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t,
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intptr_t, intptr_t, bool);
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HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t,
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intptr_t, intptr_t, bool);
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#define DTRACE_THREAD_PROBE(probe, javathread) \
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{ \
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ResourceMark rm(this); \
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int len = 0; \
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const char* name = (javathread)->get_thread_name(); \
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len = strlen(name); \
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HS_DTRACE_PROBE5(hotspot, thread__##probe, \
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name, len, \
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java_lang_Thread::thread_id((javathread)->threadObj()), \
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(javathread)->osthread()->thread_id(), \
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java_lang_Thread::is_daemon((javathread)->threadObj())); \
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}
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#else // ndef DTRACE_ENABLED
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#define DTRACE_THREAD_PROBE(probe, javathread)
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#endif // ndef DTRACE_ENABLED
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// Class hierarchy
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// - Thread
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// - VMThread
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// - WatcherThread
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// - ConcurrentMarkSweepThread
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// - JavaThread
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// - CompilerThread
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// ======= Thread ========
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// Support for forcing alignment of thread objects for biased locking
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void* Thread::operator new(size_t size) {
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if (UseBiasedLocking) {
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const int alignment = markOopDesc::biased_lock_alignment;
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size_t aligned_size = size + (alignment - sizeof(intptr_t));
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void* real_malloc_addr = CHeapObj::operator new(aligned_size);
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void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment);
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assert(((uintptr_t) aligned_addr + (uintptr_t) size) <=
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((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size),
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"JavaThread alignment code overflowed allocated storage");
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if (TraceBiasedLocking) {
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if (aligned_addr != real_malloc_addr)
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tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT,
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real_malloc_addr, aligned_addr);
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}
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((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr;
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return aligned_addr;
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} else {
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return CHeapObj::operator new(size);
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}
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}
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void Thread::operator delete(void* p) {
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if (UseBiasedLocking) {
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void* real_malloc_addr = ((Thread*) p)->_real_malloc_address;
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CHeapObj::operator delete(real_malloc_addr);
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} else {
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CHeapObj::operator delete(p);
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}
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}
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// Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread,
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// JavaThread
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Thread::Thread() {
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// stack
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_stack_base = NULL;
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_stack_size = 0;
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_self_raw_id = 0;
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_lgrp_id = -1;
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_osthread = NULL;
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// allocated data structures
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set_resource_area(new ResourceArea());
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set_handle_area(new HandleArea(NULL));
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set_active_handles(NULL);
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set_free_handle_block(NULL);
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set_last_handle_mark(NULL);
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set_osthread(NULL);
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// This initial value ==> never claimed.
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_oops_do_parity = 0;
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// the handle mark links itself to last_handle_mark
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new HandleMark(this);
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// plain initialization
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debug_only(_owned_locks = NULL;)
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debug_only(_allow_allocation_count = 0;)
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NOT_PRODUCT(_allow_safepoint_count = 0;)
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CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;)
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_highest_lock = NULL;
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_jvmti_env_iteration_count = 0;
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_vm_operation_started_count = 0;
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_vm_operation_completed_count = 0;
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_current_pending_monitor = NULL;
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_current_pending_monitor_is_from_java = true;
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_current_waiting_monitor = NULL;
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_num_nested_signal = 0;
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omFreeList = NULL ;
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omFreeCount = 0 ;
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omFreeProvision = 32 ;
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_SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true);
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_suspend_flags = 0;
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// thread-specific hashCode stream generator state - Marsaglia shift-xor form
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_hashStateX = os::random() ;
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_hashStateY = 842502087 ;
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_hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ;
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_hashStateW = 273326509 ;
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_OnTrap = 0 ;
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_schedctl = NULL ;
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_Stalled = 0 ;
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_TypeTag = 0x2BAD ;
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// Many of the following fields are effectively final - immutable
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// Note that nascent threads can't use the Native Monitor-Mutex
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// construct until the _MutexEvent is initialized ...
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// CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents
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// we might instead use a stack of ParkEvents that we could provision on-demand.
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// The stack would act as a cache to avoid calls to ParkEvent::Allocate()
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// and ::Release()
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_ParkEvent = ParkEvent::Allocate (this) ;
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_SleepEvent = ParkEvent::Allocate (this) ;
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_MutexEvent = ParkEvent::Allocate (this) ;
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_MuxEvent = ParkEvent::Allocate (this) ;
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#ifdef CHECK_UNHANDLED_OOPS
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if (CheckUnhandledOops) {
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_unhandled_oops = new UnhandledOops(this);
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}
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#endif // CHECK_UNHANDLED_OOPS
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#ifdef ASSERT
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if (UseBiasedLocking) {
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assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed");
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assert(this == _real_malloc_address ||
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this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment),
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"bug in forced alignment of thread objects");
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}
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#endif /* ASSERT */
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}
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void Thread::initialize_thread_local_storage() {
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// Note: Make sure this method only calls
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// non-blocking operations. Otherwise, it might not work
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// with the thread-startup/safepoint interaction.
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// During Java thread startup, safepoint code should allow this
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// method to complete because it may need to allocate memory to
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// store information for the new thread.
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// initialize structure dependent on thread local storage
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ThreadLocalStorage::set_thread(this);
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// set up any platform-specific state.
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os::initialize_thread();
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}
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void Thread::record_stack_base_and_size() {
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set_stack_base(os::current_stack_base());
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set_stack_size(os::current_stack_size());
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}
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Thread::~Thread() {
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// Reclaim the objectmonitors from the omFreeList of the moribund thread.
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ObjectSynchronizer::omFlush (this) ;
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// deallocate data structures
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delete resource_area();
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// since the handle marks are using the handle area, we have to deallocated the root
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// handle mark before deallocating the thread's handle area,
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assert(last_handle_mark() != NULL, "check we have an element");
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delete last_handle_mark();
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assert(last_handle_mark() == NULL, "check we have reached the end");
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// It's possible we can encounter a null _ParkEvent, etc., in stillborn threads.
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// We NULL out the fields for good hygiene.
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ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ;
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ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ;
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ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ;
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ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ;
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delete handle_area();
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// osthread() can be NULL, if creation of thread failed.
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if (osthread() != NULL) os::free_thread(osthread());
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delete _SR_lock;
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// clear thread local storage if the Thread is deleting itself
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if (this == Thread::current()) {
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ThreadLocalStorage::set_thread(NULL);
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} else {
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// In the case where we're not the current thread, invalidate all the
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// caches in case some code tries to get the current thread or the
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// thread that was destroyed, and gets stale information.
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ThreadLocalStorage::invalidate_all();
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}
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CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();)
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}
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// NOTE: dummy function for assertion purpose.
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void Thread::run() {
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ShouldNotReachHere();
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}
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#ifdef ASSERT
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// Private method to check for dangling thread pointer
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void check_for_dangling_thread_pointer(Thread *thread) {
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assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
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"possibility of dangling Thread pointer");
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}
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#endif
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#ifndef PRODUCT
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// Tracing method for basic thread operations
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void Thread::trace(const char* msg, const Thread* const thread) {
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if (!TraceThreadEvents) return;
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ResourceMark rm;
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ThreadCritical tc;
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const char *name = "non-Java thread";
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int prio = -1;
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if (thread->is_Java_thread()
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&& !thread->is_Compiler_thread()) {
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// The Threads_lock must be held to get information about
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// this thread but may not be in some situations when
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// tracing thread events.
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bool release_Threads_lock = false;
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if (!Threads_lock->owned_by_self()) {
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Threads_lock->lock();
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release_Threads_lock = true;
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}
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JavaThread* jt = (JavaThread *)thread;
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name = (char *)jt->get_thread_name();
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oop thread_oop = jt->threadObj();
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if (thread_oop != NULL) {
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prio = java_lang_Thread::priority(thread_oop);
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}
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if (release_Threads_lock) {
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Threads_lock->unlock();
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}
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}
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tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio);
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}
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#endif
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ThreadPriority Thread::get_priority(const Thread* const thread) {
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trace("get priority", thread);
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ThreadPriority priority;
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// Can return an error!
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(void)os::get_priority(thread, priority);
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assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found");
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return priority;
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}
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void Thread::set_priority(Thread* thread, ThreadPriority priority) {
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trace("set priority", thread);
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debug_only(check_for_dangling_thread_pointer(thread);)
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// Can return an error!
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(void)os::set_priority(thread, priority);
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}
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void Thread::start(Thread* thread) {
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trace("start", thread);
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// Start is different from resume in that its safety is guaranteed by context or
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// being called from a Java method synchronized on the Thread object.
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if (!DisableStartThread) {
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if (thread->is_Java_thread()) {
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// Initialize the thread state to RUNNABLE before starting this thread.
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// Can not set it after the thread started because we do not know the
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// exact thread state at that time. It could be in MONITOR_WAIT or
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// in SLEEPING or some other state.
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java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(),
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java_lang_Thread::RUNNABLE);
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}
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os::start_thread(thread);
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}
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}
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// Enqueue a VM_Operation to do the job for us - sometime later
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void Thread::send_async_exception(oop java_thread, oop java_throwable) {
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VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable);
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VMThread::execute(vm_stop);
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}
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//
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// Check if an external suspend request has completed (or has been
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// cancelled). Returns true if the thread is externally suspended and
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// false otherwise.
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//
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// The bits parameter returns information about the code path through
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// the routine. Useful for debugging:
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//
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// set in is_ext_suspend_completed():
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// 0x00000001 - routine was entered
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// 0x00000010 - routine return false at end
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// 0x00000100 - thread exited (return false)
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// 0x00000200 - suspend request cancelled (return false)
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// 0x00000400 - thread suspended (return true)
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// 0x00001000 - thread is in a suspend equivalent state (return true)
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// 0x00002000 - thread is native and walkable (return true)
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// 0x00004000 - thread is native_trans and walkable (needed retry)
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//
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// set in wait_for_ext_suspend_completion():
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// 0x00010000 - routine was entered
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// 0x00020000 - suspend request cancelled before loop (return false)
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// 0x00040000 - thread suspended before loop (return true)
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// 0x00080000 - suspend request cancelled in loop (return false)
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// 0x00100000 - thread suspended in loop (return true)
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// 0x00200000 - suspend not completed during retry loop (return false)
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//
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// Helper class for tracing suspend wait debug bits.
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//
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// 0x00000100 indicates that the target thread exited before it could
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// self-suspend which is not a wait failure. 0x00000200, 0x00020000 and
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// 0x00080000 each indicate a cancelled suspend request so they don't
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// count as wait failures either.
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#define DEBUG_FALSE_BITS (0x00000010 | 0x00200000)
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class TraceSuspendDebugBits : public StackObj {
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private:
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JavaThread * jt;
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bool is_wait;
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bool called_by_wait; // meaningful when !is_wait
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uint32_t * bits;
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public:
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TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait,
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uint32_t *_bits) {
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jt = _jt;
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is_wait = _is_wait;
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called_by_wait = _called_by_wait;
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bits = _bits;
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}
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~TraceSuspendDebugBits() {
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if (!is_wait) {
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#if 1
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// By default, don't trace bits for is_ext_suspend_completed() calls.
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// That trace is very chatty.
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return;
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#else
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if (!called_by_wait) {
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// If tracing for is_ext_suspend_completed() is enabled, then only
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// trace calls to it from wait_for_ext_suspend_completion()
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return;
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}
|
|
396 |
#endif
|
|
397 |
}
|
|
398 |
|
|
399 |
if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) {
|
|
400 |
if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) {
|
|
401 |
MutexLocker ml(Threads_lock); // needed for get_thread_name()
|
|
402 |
ResourceMark rm;
|
|
403 |
|
|
404 |
tty->print_cr(
|
|
405 |
"Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)",
|
|
406 |
jt->get_thread_name(), *bits);
|
|
407 |
|
|
408 |
guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed");
|
|
409 |
}
|
|
410 |
}
|
|
411 |
}
|
|
412 |
};
|
|
413 |
#undef DEBUG_FALSE_BITS
|
|
414 |
|
|
415 |
|
|
416 |
bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) {
|
|
417 |
TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits);
|
|
418 |
|
|
419 |
bool did_trans_retry = false; // only do thread_in_native_trans retry once
|
|
420 |
bool do_trans_retry; // flag to force the retry
|
|
421 |
|
|
422 |
*bits |= 0x00000001;
|
|
423 |
|
|
424 |
do {
|
|
425 |
do_trans_retry = false;
|
|
426 |
|
|
427 |
if (is_exiting()) {
|
|
428 |
// Thread is in the process of exiting. This is always checked
|
|
429 |
// first to reduce the risk of dereferencing a freed JavaThread.
|
|
430 |
*bits |= 0x00000100;
|
|
431 |
return false;
|
|
432 |
}
|
|
433 |
|
|
434 |
if (!is_external_suspend()) {
|
|
435 |
// Suspend request is cancelled. This is always checked before
|
|
436 |
// is_ext_suspended() to reduce the risk of a rogue resume
|
|
437 |
// confusing the thread that made the suspend request.
|
|
438 |
*bits |= 0x00000200;
|
|
439 |
return false;
|
|
440 |
}
|
|
441 |
|
|
442 |
if (is_ext_suspended()) {
|
|
443 |
// thread is suspended
|
|
444 |
*bits |= 0x00000400;
|
|
445 |
return true;
|
|
446 |
}
|
|
447 |
|
|
448 |
// Now that we no longer do hard suspends of threads running
|
|
449 |
// native code, the target thread can be changing thread state
|
|
450 |
// while we are in this routine:
|
|
451 |
//
|
|
452 |
// _thread_in_native -> _thread_in_native_trans -> _thread_blocked
|
|
453 |
//
|
|
454 |
// We save a copy of the thread state as observed at this moment
|
|
455 |
// and make our decision about suspend completeness based on the
|
|
456 |
// copy. This closes the race where the thread state is seen as
|
|
457 |
// _thread_in_native_trans in the if-thread_blocked check, but is
|
|
458 |
// seen as _thread_blocked in if-thread_in_native_trans check.
|
|
459 |
JavaThreadState save_state = thread_state();
|
|
460 |
|
|
461 |
if (save_state == _thread_blocked && is_suspend_equivalent()) {
|
|
462 |
// If the thread's state is _thread_blocked and this blocking
|
|
463 |
// condition is known to be equivalent to a suspend, then we can
|
|
464 |
// consider the thread to be externally suspended. This means that
|
|
465 |
// the code that sets _thread_blocked has been modified to do
|
|
466 |
// self-suspension if the blocking condition releases. We also
|
|
467 |
// used to check for CONDVAR_WAIT here, but that is now covered by
|
|
468 |
// the _thread_blocked with self-suspension check.
|
|
469 |
//
|
|
470 |
// Return true since we wouldn't be here unless there was still an
|
|
471 |
// external suspend request.
|
|
472 |
*bits |= 0x00001000;
|
|
473 |
return true;
|
|
474 |
} else if (save_state == _thread_in_native && frame_anchor()->walkable()) {
|
|
475 |
// Threads running native code will self-suspend on native==>VM/Java
|
|
476 |
// transitions. If its stack is walkable (should always be the case
|
|
477 |
// unless this function is called before the actual java_suspend()
|
|
478 |
// call), then the wait is done.
|
|
479 |
*bits |= 0x00002000;
|
|
480 |
return true;
|
|
481 |
} else if (!called_by_wait && !did_trans_retry &&
|
|
482 |
save_state == _thread_in_native_trans &&
|
|
483 |
frame_anchor()->walkable()) {
|
|
484 |
// The thread is transitioning from thread_in_native to another
|
|
485 |
// thread state. check_safepoint_and_suspend_for_native_trans()
|
|
486 |
// will force the thread to self-suspend. If it hasn't gotten
|
|
487 |
// there yet we may have caught the thread in-between the native
|
|
488 |
// code check above and the self-suspend. Lucky us. If we were
|
|
489 |
// called by wait_for_ext_suspend_completion(), then it
|
|
490 |
// will be doing the retries so we don't have to.
|
|
491 |
//
|
|
492 |
// Since we use the saved thread state in the if-statement above,
|
|
493 |
// there is a chance that the thread has already transitioned to
|
|
494 |
// _thread_blocked by the time we get here. In that case, we will
|
|
495 |
// make a single unnecessary pass through the logic below. This
|
|
496 |
// doesn't hurt anything since we still do the trans retry.
|
|
497 |
|
|
498 |
*bits |= 0x00004000;
|
|
499 |
|
|
500 |
// Once the thread leaves thread_in_native_trans for another
|
|
501 |
// thread state, we break out of this retry loop. We shouldn't
|
|
502 |
// need this flag to prevent us from getting back here, but
|
|
503 |
// sometimes paranoia is good.
|
|
504 |
did_trans_retry = true;
|
|
505 |
|
|
506 |
// We wait for the thread to transition to a more usable state.
|
|
507 |
for (int i = 1; i <= SuspendRetryCount; i++) {
|
|
508 |
// We used to do an "os::yield_all(i)" call here with the intention
|
|
509 |
// that yielding would increase on each retry. However, the parameter
|
|
510 |
// is ignored on Linux which means the yield didn't scale up. Waiting
|
|
511 |
// on the SR_lock below provides a much more predictable scale up for
|
|
512 |
// the delay. It also provides a simple/direct point to check for any
|
|
513 |
// safepoint requests from the VMThread
|
|
514 |
|
|
515 |
// temporarily drops SR_lock while doing wait with safepoint check
|
|
516 |
// (if we're a JavaThread - the WatcherThread can also call this)
|
|
517 |
// and increase delay with each retry
|
|
518 |
SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay);
|
|
519 |
|
|
520 |
// check the actual thread state instead of what we saved above
|
|
521 |
if (thread_state() != _thread_in_native_trans) {
|
|
522 |
// the thread has transitioned to another thread state so
|
|
523 |
// try all the checks (except this one) one more time.
|
|
524 |
do_trans_retry = true;
|
|
525 |
break;
|
|
526 |
}
|
|
527 |
} // end retry loop
|
|
528 |
|
|
529 |
|
|
530 |
}
|
|
531 |
} while (do_trans_retry);
|
|
532 |
|
|
533 |
*bits |= 0x00000010;
|
|
534 |
return false;
|
|
535 |
}
|
|
536 |
|
|
537 |
//
|
|
538 |
// Wait for an external suspend request to complete (or be cancelled).
|
|
539 |
// Returns true if the thread is externally suspended and false otherwise.
|
|
540 |
//
|
|
541 |
bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay,
|
|
542 |
uint32_t *bits) {
|
|
543 |
TraceSuspendDebugBits tsdb(this, true /* is_wait */,
|
|
544 |
false /* !called_by_wait */, bits);
|
|
545 |
|
|
546 |
// local flag copies to minimize SR_lock hold time
|
|
547 |
bool is_suspended;
|
|
548 |
bool pending;
|
|
549 |
uint32_t reset_bits;
|
|
550 |
|
|
551 |
// set a marker so is_ext_suspend_completed() knows we are the caller
|
|
552 |
*bits |= 0x00010000;
|
|
553 |
|
|
554 |
// We use reset_bits to reinitialize the bits value at the top of
|
|
555 |
// each retry loop. This allows the caller to make use of any
|
|
556 |
// unused bits for their own marking purposes.
|
|
557 |
reset_bits = *bits;
|
|
558 |
|
|
559 |
{
|
|
560 |
MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
|
|
561 |
is_suspended = is_ext_suspend_completed(true /* called_by_wait */,
|
|
562 |
delay, bits);
|
|
563 |
pending = is_external_suspend();
|
|
564 |
}
|
|
565 |
// must release SR_lock to allow suspension to complete
|
|
566 |
|
|
567 |
if (!pending) {
|
|
568 |
// A cancelled suspend request is the only false return from
|
|
569 |
// is_ext_suspend_completed() that keeps us from entering the
|
|
570 |
// retry loop.
|
|
571 |
*bits |= 0x00020000;
|
|
572 |
return false;
|
|
573 |
}
|
|
574 |
|
|
575 |
if (is_suspended) {
|
|
576 |
*bits |= 0x00040000;
|
|
577 |
return true;
|
|
578 |
}
|
|
579 |
|
|
580 |
for (int i = 1; i <= retries; i++) {
|
|
581 |
*bits = reset_bits; // reinit to only track last retry
|
|
582 |
|
|
583 |
// We used to do an "os::yield_all(i)" call here with the intention
|
|
584 |
// that yielding would increase on each retry. However, the parameter
|
|
585 |
// is ignored on Linux which means the yield didn't scale up. Waiting
|
|
586 |
// on the SR_lock below provides a much more predictable scale up for
|
|
587 |
// the delay. It also provides a simple/direct point to check for any
|
|
588 |
// safepoint requests from the VMThread
|
|
589 |
|
|
590 |
{
|
|
591 |
MutexLocker ml(SR_lock());
|
|
592 |
// wait with safepoint check (if we're a JavaThread - the WatcherThread
|
|
593 |
// can also call this) and increase delay with each retry
|
|
594 |
SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay);
|
|
595 |
|
|
596 |
is_suspended = is_ext_suspend_completed(true /* called_by_wait */,
|
|
597 |
delay, bits);
|
|
598 |
|
|
599 |
// It is possible for the external suspend request to be cancelled
|
|
600 |
// (by a resume) before the actual suspend operation is completed.
|
|
601 |
// Refresh our local copy to see if we still need to wait.
|
|
602 |
pending = is_external_suspend();
|
|
603 |
}
|
|
604 |
|
|
605 |
if (!pending) {
|
|
606 |
// A cancelled suspend request is the only false return from
|
|
607 |
// is_ext_suspend_completed() that keeps us from staying in the
|
|
608 |
// retry loop.
|
|
609 |
*bits |= 0x00080000;
|
|
610 |
return false;
|
|
611 |
}
|
|
612 |
|
|
613 |
if (is_suspended) {
|
|
614 |
*bits |= 0x00100000;
|
|
615 |
return true;
|
|
616 |
}
|
|
617 |
} // end retry loop
|
|
618 |
|
|
619 |
// thread did not suspend after all our retries
|
|
620 |
*bits |= 0x00200000;
|
|
621 |
return false;
|
|
622 |
}
|
|
623 |
|
|
624 |
#ifndef PRODUCT
|
|
625 |
void JavaThread::record_jump(address target, address instr, const char* file, int line) {
|
|
626 |
|
|
627 |
// This should not need to be atomic as the only way for simultaneous
|
|
628 |
// updates is via interrupts. Even then this should be rare or non-existant
|
|
629 |
// and we don't care that much anyway.
|
|
630 |
|
|
631 |
int index = _jmp_ring_index;
|
|
632 |
_jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1);
|
|
633 |
_jmp_ring[index]._target = (intptr_t) target;
|
|
634 |
_jmp_ring[index]._instruction = (intptr_t) instr;
|
|
635 |
_jmp_ring[index]._file = file;
|
|
636 |
_jmp_ring[index]._line = line;
|
|
637 |
}
|
|
638 |
#endif /* PRODUCT */
|
|
639 |
|
|
640 |
// Called by flat profiler
|
|
641 |
// Callers have already called wait_for_ext_suspend_completion
|
|
642 |
// The assertion for that is currently too complex to put here:
|
|
643 |
bool JavaThread::profile_last_Java_frame(frame* _fr) {
|
|
644 |
bool gotframe = false;
|
|
645 |
// self suspension saves needed state.
|
|
646 |
if (has_last_Java_frame() && _anchor.walkable()) {
|
|
647 |
*_fr = pd_last_frame();
|
|
648 |
gotframe = true;
|
|
649 |
}
|
|
650 |
return gotframe;
|
|
651 |
}
|
|
652 |
|
|
653 |
void Thread::interrupt(Thread* thread) {
|
|
654 |
trace("interrupt", thread);
|
|
655 |
debug_only(check_for_dangling_thread_pointer(thread);)
|
|
656 |
os::interrupt(thread);
|
|
657 |
}
|
|
658 |
|
|
659 |
bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) {
|
|
660 |
trace("is_interrupted", thread);
|
|
661 |
debug_only(check_for_dangling_thread_pointer(thread);)
|
|
662 |
// Note: If clear_interrupted==false, this simply fetches and
|
|
663 |
// returns the value of the field osthread()->interrupted().
|
|
664 |
return os::is_interrupted(thread, clear_interrupted);
|
|
665 |
}
|
|
666 |
|
|
667 |
|
|
668 |
// GC Support
|
|
669 |
bool Thread::claim_oops_do_par_case(int strong_roots_parity) {
|
|
670 |
jint thread_parity = _oops_do_parity;
|
|
671 |
if (thread_parity != strong_roots_parity) {
|
|
672 |
jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity);
|
|
673 |
if (res == thread_parity) return true;
|
|
674 |
else {
|
|
675 |
guarantee(res == strong_roots_parity, "Or else what?");
|
|
676 |
assert(SharedHeap::heap()->n_par_threads() > 0,
|
|
677 |
"Should only fail when parallel.");
|
|
678 |
return false;
|
|
679 |
}
|
|
680 |
}
|
|
681 |
assert(SharedHeap::heap()->n_par_threads() > 0,
|
|
682 |
"Should only fail when parallel.");
|
|
683 |
return false;
|
|
684 |
}
|
|
685 |
|
|
686 |
void Thread::oops_do(OopClosure* f) {
|
|
687 |
active_handles()->oops_do(f);
|
|
688 |
// Do oop for ThreadShadow
|
|
689 |
f->do_oop((oop*)&_pending_exception);
|
|
690 |
handle_area()->oops_do(f);
|
|
691 |
}
|
|
692 |
|
|
693 |
void Thread::nmethods_do() {
|
|
694 |
}
|
|
695 |
|
|
696 |
void Thread::print_on(outputStream* st) const {
|
|
697 |
// get_priority assumes osthread initialized
|
|
698 |
if (osthread() != NULL) {
|
|
699 |
st->print("prio=%d tid=" INTPTR_FORMAT " ", get_priority(this), this);
|
|
700 |
osthread()->print_on(st);
|
|
701 |
}
|
|
702 |
debug_only(if (WizardMode) print_owned_locks_on(st);)
|
|
703 |
}
|
|
704 |
|
|
705 |
// Thread::print_on_error() is called by fatal error handler. Don't use
|
|
706 |
// any lock or allocate memory.
|
|
707 |
void Thread::print_on_error(outputStream* st, char* buf, int buflen) const {
|
|
708 |
if (is_VM_thread()) st->print("VMThread");
|
|
709 |
else if (is_Compiler_thread()) st->print("CompilerThread");
|
|
710 |
else if (is_Java_thread()) st->print("JavaThread");
|
|
711 |
else if (is_GC_task_thread()) st->print("GCTaskThread");
|
|
712 |
else if (is_Watcher_thread()) st->print("WatcherThread");
|
|
713 |
else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread");
|
|
714 |
else st->print("Thread");
|
|
715 |
|
|
716 |
st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]",
|
|
717 |
_stack_base - _stack_size, _stack_base);
|
|
718 |
|
|
719 |
if (osthread()) {
|
|
720 |
st->print(" [id=%d]", osthread()->thread_id());
|
|
721 |
}
|
|
722 |
}
|
|
723 |
|
|
724 |
#ifdef ASSERT
|
|
725 |
void Thread::print_owned_locks_on(outputStream* st) const {
|
|
726 |
Monitor *cur = _owned_locks;
|
|
727 |
if (cur == NULL) {
|
|
728 |
st->print(" (no locks) ");
|
|
729 |
} else {
|
|
730 |
st->print_cr(" Locks owned:");
|
|
731 |
while(cur) {
|
|
732 |
cur->print_on(st);
|
|
733 |
cur = cur->next();
|
|
734 |
}
|
|
735 |
}
|
|
736 |
}
|
|
737 |
|
|
738 |
static int ref_use_count = 0;
|
|
739 |
|
|
740 |
bool Thread::owns_locks_but_compiled_lock() const {
|
|
741 |
for(Monitor *cur = _owned_locks; cur; cur = cur->next()) {
|
|
742 |
if (cur != Compile_lock) return true;
|
|
743 |
}
|
|
744 |
return false;
|
|
745 |
}
|
|
746 |
|
|
747 |
|
|
748 |
#endif
|
|
749 |
|
|
750 |
#ifndef PRODUCT
|
|
751 |
|
|
752 |
// The flag: potential_vm_operation notifies if this particular safepoint state could potential
|
|
753 |
// invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that
|
|
754 |
// no threads which allow_vm_block's are held
|
|
755 |
void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) {
|
|
756 |
// Check if current thread is allowed to block at a safepoint
|
|
757 |
if (!(_allow_safepoint_count == 0))
|
|
758 |
fatal("Possible safepoint reached by thread that does not allow it");
|
|
759 |
if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) {
|
|
760 |
fatal("LEAF method calling lock?");
|
|
761 |
}
|
|
762 |
|
|
763 |
#ifdef ASSERT
|
|
764 |
if (potential_vm_operation && is_Java_thread()
|
|
765 |
&& !Universe::is_bootstrapping()) {
|
|
766 |
// Make sure we do not hold any locks that the VM thread also uses.
|
|
767 |
// This could potentially lead to deadlocks
|
|
768 |
for(Monitor *cur = _owned_locks; cur; cur = cur->next()) {
|
|
769 |
// Threads_lock is special, since the safepoint synchronization will not start before this is
|
|
770 |
// acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock,
|
|
771 |
// since it is used to transfer control between JavaThreads and the VMThread
|
|
772 |
// Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first!
|
|
773 |
if ( (cur->allow_vm_block() &&
|
|
774 |
cur != Threads_lock &&
|
|
775 |
cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation
|
|
776 |
cur != VMOperationRequest_lock &&
|
|
777 |
cur != VMOperationQueue_lock) ||
|
|
778 |
cur->rank() == Mutex::special) {
|
|
779 |
warning("Thread holding lock at safepoint that vm can block on: %s", cur->name());
|
|
780 |
}
|
|
781 |
}
|
|
782 |
}
|
|
783 |
|
|
784 |
if (GCALotAtAllSafepoints) {
|
|
785 |
// We could enter a safepoint here and thus have a gc
|
|
786 |
InterfaceSupport::check_gc_alot();
|
|
787 |
}
|
|
788 |
|
|
789 |
#endif
|
|
790 |
}
|
|
791 |
#endif
|
|
792 |
|
|
793 |
bool Thread::lock_is_in_stack(address adr) const {
|
|
794 |
assert(Thread::current() == this, "lock_is_in_stack can only be called from current thread");
|
|
795 |
// High limit: highest_lock is set during thread execution
|
|
796 |
// Low limit: address of the local variable dummy, rounded to 4K boundary.
|
|
797 |
// (The rounding helps finding threads in unsafe mode, even if the particular stack
|
|
798 |
// frame has been popped already. Correct as long as stacks are at least 4K long and aligned.)
|
|
799 |
address end = os::current_stack_pointer();
|
|
800 |
if (_highest_lock >= adr && adr >= end) return true;
|
|
801 |
|
|
802 |
return false;
|
|
803 |
}
|
|
804 |
|
|
805 |
|
|
806 |
bool Thread::is_in_stack(address adr) const {
|
|
807 |
assert(Thread::current() == this, "is_in_stack can only be called from current thread");
|
|
808 |
address end = os::current_stack_pointer();
|
|
809 |
if (stack_base() >= adr && adr >= end) return true;
|
|
810 |
|
|
811 |
return false;
|
|
812 |
}
|
|
813 |
|
|
814 |
|
|
815 |
// We had to move these methods here, because vm threads get into ObjectSynchronizer::enter
|
|
816 |
// However, there is a note in JavaThread::is_lock_owned() about the VM threads not being
|
|
817 |
// used for compilation in the future. If that change is made, the need for these methods
|
|
818 |
// should be revisited, and they should be removed if possible.
|
|
819 |
|
|
820 |
bool Thread::is_lock_owned(address adr) const {
|
|
821 |
if (lock_is_in_stack(adr) ) return true;
|
|
822 |
return false;
|
|
823 |
}
|
|
824 |
|
|
825 |
bool Thread::set_as_starting_thread() {
|
|
826 |
// NOTE: this must be called inside the main thread.
|
|
827 |
return os::create_main_thread((JavaThread*)this);
|
|
828 |
}
|
|
829 |
|
|
830 |
static void initialize_class(symbolHandle class_name, TRAPS) {
|
|
831 |
klassOop klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK);
|
|
832 |
instanceKlass::cast(klass)->initialize(CHECK);
|
|
833 |
}
|
|
834 |
|
|
835 |
|
|
836 |
// Creates the initial ThreadGroup
|
|
837 |
static Handle create_initial_thread_group(TRAPS) {
|
|
838 |
klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_ThreadGroup(), true, CHECK_NH);
|
|
839 |
instanceKlassHandle klass (THREAD, k);
|
|
840 |
|
|
841 |
Handle system_instance = klass->allocate_instance_handle(CHECK_NH);
|
|
842 |
{
|
|
843 |
JavaValue result(T_VOID);
|
|
844 |
JavaCalls::call_special(&result,
|
|
845 |
system_instance,
|
|
846 |
klass,
|
|
847 |
vmSymbolHandles::object_initializer_name(),
|
|
848 |
vmSymbolHandles::void_method_signature(),
|
|
849 |
CHECK_NH);
|
|
850 |
}
|
|
851 |
Universe::set_system_thread_group(system_instance());
|
|
852 |
|
|
853 |
Handle main_instance = klass->allocate_instance_handle(CHECK_NH);
|
|
854 |
{
|
|
855 |
JavaValue result(T_VOID);
|
|
856 |
Handle string = java_lang_String::create_from_str("main", CHECK_NH);
|
|
857 |
JavaCalls::call_special(&result,
|
|
858 |
main_instance,
|
|
859 |
klass,
|
|
860 |
vmSymbolHandles::object_initializer_name(),
|
|
861 |
vmSymbolHandles::threadgroup_string_void_signature(),
|
|
862 |
system_instance,
|
|
863 |
string,
|
|
864 |
CHECK_NH);
|
|
865 |
}
|
|
866 |
return main_instance;
|
|
867 |
}
|
|
868 |
|
|
869 |
// Creates the initial Thread
|
|
870 |
static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) {
|
|
871 |
klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_Thread(), true, CHECK_NULL);
|
|
872 |
instanceKlassHandle klass (THREAD, k);
|
|
873 |
instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL);
|
|
874 |
|
|
875 |
java_lang_Thread::set_thread(thread_oop(), thread);
|
|
876 |
java_lang_Thread::set_priority(thread_oop(), NormPriority);
|
|
877 |
thread->set_threadObj(thread_oop());
|
|
878 |
|
|
879 |
Handle string = java_lang_String::create_from_str("main", CHECK_NULL);
|
|
880 |
|
|
881 |
JavaValue result(T_VOID);
|
|
882 |
JavaCalls::call_special(&result, thread_oop,
|
|
883 |
klass,
|
|
884 |
vmSymbolHandles::object_initializer_name(),
|
|
885 |
vmSymbolHandles::threadgroup_string_void_signature(),
|
|
886 |
thread_group,
|
|
887 |
string,
|
|
888 |
CHECK_NULL);
|
|
889 |
return thread_oop();
|
|
890 |
}
|
|
891 |
|
|
892 |
static void call_initializeSystemClass(TRAPS) {
|
|
893 |
klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_System(), true, CHECK);
|
|
894 |
instanceKlassHandle klass (THREAD, k);
|
|
895 |
|
|
896 |
JavaValue result(T_VOID);
|
|
897 |
JavaCalls::call_static(&result, klass, vmSymbolHandles::initializeSystemClass_name(),
|
|
898 |
vmSymbolHandles::void_method_signature(), CHECK);
|
|
899 |
}
|
|
900 |
|
|
901 |
static void reset_vm_info_property(TRAPS) {
|
|
902 |
// the vm info string
|
|
903 |
ResourceMark rm(THREAD);
|
|
904 |
const char *vm_info = VM_Version::vm_info_string();
|
|
905 |
|
|
906 |
// java.lang.System class
|
|
907 |
klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_System(), true, CHECK);
|
|
908 |
instanceKlassHandle klass (THREAD, k);
|
|
909 |
|
|
910 |
// setProperty arguments
|
|
911 |
Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK);
|
|
912 |
Handle value_str = java_lang_String::create_from_str(vm_info, CHECK);
|
|
913 |
|
|
914 |
// return value
|
|
915 |
JavaValue r(T_OBJECT);
|
|
916 |
|
|
917 |
// public static String setProperty(String key, String value);
|
|
918 |
JavaCalls::call_static(&r,
|
|
919 |
klass,
|
|
920 |
vmSymbolHandles::setProperty_name(),
|
|
921 |
vmSymbolHandles::string_string_string_signature(),
|
|
922 |
key_str,
|
|
923 |
value_str,
|
|
924 |
CHECK);
|
|
925 |
}
|
|
926 |
|
|
927 |
|
|
928 |
void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) {
|
|
929 |
assert(thread_group.not_null(), "thread group should be specified");
|
|
930 |
assert(threadObj() == NULL, "should only create Java thread object once");
|
|
931 |
|
|
932 |
klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_Thread(), true, CHECK);
|
|
933 |
instanceKlassHandle klass (THREAD, k);
|
|
934 |
instanceHandle thread_oop = klass->allocate_instance_handle(CHECK);
|
|
935 |
|
|
936 |
java_lang_Thread::set_thread(thread_oop(), this);
|
|
937 |
java_lang_Thread::set_priority(thread_oop(), NormPriority);
|
|
938 |
set_threadObj(thread_oop());
|
|
939 |
|
|
940 |
JavaValue result(T_VOID);
|
|
941 |
if (thread_name != NULL) {
|
|
942 |
Handle name = java_lang_String::create_from_str(thread_name, CHECK);
|
|
943 |
// Thread gets assigned specified name and null target
|
|
944 |
JavaCalls::call_special(&result,
|
|
945 |
thread_oop,
|
|
946 |
klass,
|
|
947 |
vmSymbolHandles::object_initializer_name(),
|
|
948 |
vmSymbolHandles::threadgroup_string_void_signature(),
|
|
949 |
thread_group, // Argument 1
|
|
950 |
name, // Argument 2
|
|
951 |
THREAD);
|
|
952 |
} else {
|
|
953 |
// Thread gets assigned name "Thread-nnn" and null target
|
|
954 |
// (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument)
|
|
955 |
JavaCalls::call_special(&result,
|
|
956 |
thread_oop,
|
|
957 |
klass,
|
|
958 |
vmSymbolHandles::object_initializer_name(),
|
|
959 |
vmSymbolHandles::threadgroup_runnable_void_signature(),
|
|
960 |
thread_group, // Argument 1
|
|
961 |
Handle(), // Argument 2
|
|
962 |
THREAD);
|
|
963 |
}
|
|
964 |
|
|
965 |
|
|
966 |
if (daemon) {
|
|
967 |
java_lang_Thread::set_daemon(thread_oop());
|
|
968 |
}
|
|
969 |
|
|
970 |
if (HAS_PENDING_EXCEPTION) {
|
|
971 |
return;
|
|
972 |
}
|
|
973 |
|
|
974 |
KlassHandle group(this, SystemDictionary::threadGroup_klass());
|
|
975 |
Handle threadObj(this, this->threadObj());
|
|
976 |
|
|
977 |
JavaCalls::call_special(&result,
|
|
978 |
thread_group,
|
|
979 |
group,
|
|
980 |
vmSymbolHandles::add_method_name(),
|
|
981 |
vmSymbolHandles::thread_void_signature(),
|
|
982 |
threadObj, // Arg 1
|
|
983 |
THREAD);
|
|
984 |
|
|
985 |
|
|
986 |
}
|
|
987 |
|
|
988 |
// NamedThread -- non-JavaThread subclasses with multiple
|
|
989 |
// uniquely named instances should derive from this.
|
|
990 |
NamedThread::NamedThread() : Thread() {
|
|
991 |
_name = NULL;
|
|
992 |
}
|
|
993 |
|
|
994 |
NamedThread::~NamedThread() {
|
|
995 |
if (_name != NULL) {
|
|
996 |
FREE_C_HEAP_ARRAY(char, _name);
|
|
997 |
_name = NULL;
|
|
998 |
}
|
|
999 |
}
|
|
1000 |
|
|
1001 |
void NamedThread::set_name(const char* format, ...) {
|
|
1002 |
guarantee(_name == NULL, "Only get to set name once.");
|
|
1003 |
_name = NEW_C_HEAP_ARRAY(char, max_name_len);
|
|
1004 |
guarantee(_name != NULL, "alloc failure");
|
|
1005 |
va_list ap;
|
|
1006 |
va_start(ap, format);
|
|
1007 |
jio_vsnprintf(_name, max_name_len, format, ap);
|
|
1008 |
va_end(ap);
|
|
1009 |
}
|
|
1010 |
|
|
1011 |
// ======= WatcherThread ========
|
|
1012 |
|
|
1013 |
// The watcher thread exists to simulate timer interrupts. It should
|
|
1014 |
// be replaced by an abstraction over whatever native support for
|
|
1015 |
// timer interrupts exists on the platform.
|
|
1016 |
|
|
1017 |
WatcherThread* WatcherThread::_watcher_thread = NULL;
|
|
1018 |
bool WatcherThread::_should_terminate = false;
|
|
1019 |
|
|
1020 |
WatcherThread::WatcherThread() : Thread() {
|
|
1021 |
assert(watcher_thread() == NULL, "we can only allocate one WatcherThread");
|
|
1022 |
if (os::create_thread(this, os::watcher_thread)) {
|
|
1023 |
_watcher_thread = this;
|
|
1024 |
|
|
1025 |
// Set the watcher thread to the highest OS priority which should not be
|
|
1026 |
// used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY
|
|
1027 |
// is created. The only normal thread using this priority is the reference
|
|
1028 |
// handler thread, which runs for very short intervals only.
|
|
1029 |
// If the VMThread's priority is not lower than the WatcherThread profiling
|
|
1030 |
// will be inaccurate.
|
|
1031 |
os::set_priority(this, MaxPriority);
|
|
1032 |
if (!DisableStartThread) {
|
|
1033 |
os::start_thread(this);
|
|
1034 |
}
|
|
1035 |
}
|
|
1036 |
}
|
|
1037 |
|
|
1038 |
void WatcherThread::run() {
|
|
1039 |
assert(this == watcher_thread(), "just checking");
|
|
1040 |
|
|
1041 |
this->record_stack_base_and_size();
|
|
1042 |
this->initialize_thread_local_storage();
|
|
1043 |
this->set_active_handles(JNIHandleBlock::allocate_block());
|
|
1044 |
while(!_should_terminate) {
|
|
1045 |
assert(watcher_thread() == Thread::current(), "thread consistency check");
|
|
1046 |
assert(watcher_thread() == this, "thread consistency check");
|
|
1047 |
|
|
1048 |
// Calculate how long it'll be until the next PeriodicTask work
|
|
1049 |
// should be done, and sleep that amount of time.
|
|
1050 |
const size_t time_to_wait = PeriodicTask::time_to_wait();
|
|
1051 |
os::sleep(this, time_to_wait, false);
|
|
1052 |
|
|
1053 |
if (is_error_reported()) {
|
|
1054 |
// A fatal error has happened, the error handler(VMError::report_and_die)
|
|
1055 |
// should abort JVM after creating an error log file. However in some
|
|
1056 |
// rare cases, the error handler itself might deadlock. Here we try to
|
|
1057 |
// kill JVM if the fatal error handler fails to abort in 2 minutes.
|
|
1058 |
//
|
|
1059 |
// This code is in WatcherThread because WatcherThread wakes up
|
|
1060 |
// periodically so the fatal error handler doesn't need to do anything;
|
|
1061 |
// also because the WatcherThread is less likely to crash than other
|
|
1062 |
// threads.
|
|
1063 |
|
|
1064 |
for (;;) {
|
|
1065 |
if (!ShowMessageBoxOnError
|
|
1066 |
&& (OnError == NULL || OnError[0] == '\0')
|
|
1067 |
&& Arguments::abort_hook() == NULL) {
|
|
1068 |
os::sleep(this, 2 * 60 * 1000, false);
|
|
1069 |
fdStream err(defaultStream::output_fd());
|
|
1070 |
err.print_raw_cr("# [ timer expired, abort... ]");
|
|
1071 |
// skip atexit/vm_exit/vm_abort hooks
|
|
1072 |
os::die();
|
|
1073 |
}
|
|
1074 |
|
|
1075 |
// Wake up 5 seconds later, the fatal handler may reset OnError or
|
|
1076 |
// ShowMessageBoxOnError when it is ready to abort.
|
|
1077 |
os::sleep(this, 5 * 1000, false);
|
|
1078 |
}
|
|
1079 |
}
|
|
1080 |
|
|
1081 |
PeriodicTask::real_time_tick(time_to_wait);
|
|
1082 |
|
|
1083 |
// If we have no more tasks left due to dynamic disenrollment,
|
|
1084 |
// shut down the thread since we don't currently support dynamic enrollment
|
|
1085 |
if (PeriodicTask::num_tasks() == 0) {
|
|
1086 |
_should_terminate = true;
|
|
1087 |
}
|
|
1088 |
}
|
|
1089 |
|
|
1090 |
// Signal that it is terminated
|
|
1091 |
{
|
|
1092 |
MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag);
|
|
1093 |
_watcher_thread = NULL;
|
|
1094 |
Terminator_lock->notify();
|
|
1095 |
}
|
|
1096 |
|
|
1097 |
// Thread destructor usually does this..
|
|
1098 |
ThreadLocalStorage::set_thread(NULL);
|
|
1099 |
}
|
|
1100 |
|
|
1101 |
void WatcherThread::start() {
|
|
1102 |
if (watcher_thread() == NULL) {
|
|
1103 |
_should_terminate = false;
|
|
1104 |
// Create the single instance of WatcherThread
|
|
1105 |
new WatcherThread();
|
|
1106 |
}
|
|
1107 |
}
|
|
1108 |
|
|
1109 |
void WatcherThread::stop() {
|
|
1110 |
// it is ok to take late safepoints here, if needed
|
|
1111 |
MutexLocker mu(Terminator_lock);
|
|
1112 |
_should_terminate = true;
|
|
1113 |
while(watcher_thread() != NULL) {
|
|
1114 |
// This wait should make safepoint checks, wait without a timeout,
|
|
1115 |
// and wait as a suspend-equivalent condition.
|
|
1116 |
//
|
|
1117 |
// Note: If the FlatProfiler is running, then this thread is waiting
|
|
1118 |
// for the WatcherThread to terminate and the WatcherThread, via the
|
|
1119 |
// FlatProfiler task, is waiting for the external suspend request on
|
|
1120 |
// this thread to complete. wait_for_ext_suspend_completion() will
|
|
1121 |
// eventually timeout, but that takes time. Making this wait a
|
|
1122 |
// suspend-equivalent condition solves that timeout problem.
|
|
1123 |
//
|
|
1124 |
Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0,
|
|
1125 |
Mutex::_as_suspend_equivalent_flag);
|
|
1126 |
}
|
|
1127 |
}
|
|
1128 |
|
|
1129 |
void WatcherThread::print_on(outputStream* st) const {
|
|
1130 |
st->print("\"%s\" ", name());
|
|
1131 |
Thread::print_on(st);
|
|
1132 |
st->cr();
|
|
1133 |
}
|
|
1134 |
|
|
1135 |
// ======= JavaThread ========
|
|
1136 |
|
|
1137 |
// A JavaThread is a normal Java thread
|
|
1138 |
|
|
1139 |
void JavaThread::initialize() {
|
|
1140 |
// Initialize fields
|
|
1141 |
set_saved_exception_pc(NULL);
|
|
1142 |
set_threadObj(NULL);
|
|
1143 |
_anchor.clear();
|
|
1144 |
set_entry_point(NULL);
|
|
1145 |
set_jni_functions(jni_functions());
|
|
1146 |
set_callee_target(NULL);
|
|
1147 |
set_vm_result(NULL);
|
|
1148 |
set_vm_result_2(NULL);
|
|
1149 |
set_vframe_array_head(NULL);
|
|
1150 |
set_vframe_array_last(NULL);
|
|
1151 |
set_deferred_locals(NULL);
|
|
1152 |
set_deopt_mark(NULL);
|
|
1153 |
clear_must_deopt_id();
|
|
1154 |
set_monitor_chunks(NULL);
|
|
1155 |
set_next(NULL);
|
|
1156 |
set_thread_state(_thread_new);
|
|
1157 |
_terminated = _not_terminated;
|
|
1158 |
_privileged_stack_top = NULL;
|
|
1159 |
_array_for_gc = NULL;
|
|
1160 |
_suspend_equivalent = false;
|
|
1161 |
_in_deopt_handler = 0;
|
|
1162 |
_doing_unsafe_access = false;
|
|
1163 |
_stack_guard_state = stack_guard_unused;
|
|
1164 |
_exception_oop = NULL;
|
|
1165 |
_exception_pc = 0;
|
|
1166 |
_exception_handler_pc = 0;
|
|
1167 |
_exception_stack_size = 0;
|
|
1168 |
_jvmti_thread_state= NULL;
|
|
1169 |
_jvmti_get_loaded_classes_closure = NULL;
|
|
1170 |
_interp_only_mode = 0;
|
|
1171 |
_special_runtime_exit_condition = _no_async_condition;
|
|
1172 |
_pending_async_exception = NULL;
|
|
1173 |
_is_compiling = false;
|
|
1174 |
_thread_stat = NULL;
|
|
1175 |
_thread_stat = new ThreadStatistics();
|
|
1176 |
_blocked_on_compilation = false;
|
|
1177 |
_jni_active_critical = 0;
|
|
1178 |
_do_not_unlock_if_synchronized = false;
|
|
1179 |
_cached_monitor_info = NULL;
|
|
1180 |
_parker = Parker::Allocate(this) ;
|
|
1181 |
|
|
1182 |
#ifndef PRODUCT
|
|
1183 |
_jmp_ring_index = 0;
|
|
1184 |
for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) {
|
|
1185 |
record_jump(NULL, NULL, NULL, 0);
|
|
1186 |
}
|
|
1187 |
#endif /* PRODUCT */
|
|
1188 |
|
|
1189 |
set_thread_profiler(NULL);
|
|
1190 |
if (FlatProfiler::is_active()) {
|
|
1191 |
// This is where we would decide to either give each thread it's own profiler
|
|
1192 |
// or use one global one from FlatProfiler,
|
|
1193 |
// or up to some count of the number of profiled threads, etc.
|
|
1194 |
ThreadProfiler* pp = new ThreadProfiler();
|
|
1195 |
pp->engage();
|
|
1196 |
set_thread_profiler(pp);
|
|
1197 |
}
|
|
1198 |
|
|
1199 |
// Setup safepoint state info for this thread
|
|
1200 |
ThreadSafepointState::create(this);
|
|
1201 |
|
|
1202 |
debug_only(_java_call_counter = 0);
|
|
1203 |
|
|
1204 |
// JVMTI PopFrame support
|
|
1205 |
_popframe_condition = popframe_inactive;
|
|
1206 |
_popframe_preserved_args = NULL;
|
|
1207 |
_popframe_preserved_args_size = 0;
|
|
1208 |
|
|
1209 |
pd_initialize();
|
|
1210 |
}
|
|
1211 |
|
|
1212 |
JavaThread::JavaThread(bool is_attaching) : Thread() {
|
|
1213 |
initialize();
|
|
1214 |
_is_attaching = is_attaching;
|
|
1215 |
}
|
|
1216 |
|
|
1217 |
bool JavaThread::reguard_stack(address cur_sp) {
|
|
1218 |
if (_stack_guard_state != stack_guard_yellow_disabled) {
|
|
1219 |
return true; // Stack already guarded or guard pages not needed.
|
|
1220 |
}
|
|
1221 |
|
|
1222 |
if (register_stack_overflow()) {
|
|
1223 |
// For those architectures which have separate register and
|
|
1224 |
// memory stacks, we must check the register stack to see if
|
|
1225 |
// it has overflowed.
|
|
1226 |
return false;
|
|
1227 |
}
|
|
1228 |
|
|
1229 |
// Java code never executes within the yellow zone: the latter is only
|
|
1230 |
// there to provoke an exception during stack banging. If java code
|
|
1231 |
// is executing there, either StackShadowPages should be larger, or
|
|
1232 |
// some exception code in c1, c2 or the interpreter isn't unwinding
|
|
1233 |
// when it should.
|
|
1234 |
guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages");
|
|
1235 |
|
|
1236 |
enable_stack_yellow_zone();
|
|
1237 |
return true;
|
|
1238 |
}
|
|
1239 |
|
|
1240 |
bool JavaThread::reguard_stack(void) {
|
|
1241 |
return reguard_stack(os::current_stack_pointer());
|
|
1242 |
}
|
|
1243 |
|
|
1244 |
|
|
1245 |
void JavaThread::block_if_vm_exited() {
|
|
1246 |
if (_terminated == _vm_exited) {
|
|
1247 |
// _vm_exited is set at safepoint, and Threads_lock is never released
|
|
1248 |
// we will block here forever
|
|
1249 |
Threads_lock->lock_without_safepoint_check();
|
|
1250 |
ShouldNotReachHere();
|
|
1251 |
}
|
|
1252 |
}
|
|
1253 |
|
|
1254 |
|
|
1255 |
// Remove this ifdef when C1 is ported to the compiler interface.
|
|
1256 |
static void compiler_thread_entry(JavaThread* thread, TRAPS);
|
|
1257 |
|
|
1258 |
JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : Thread() {
|
|
1259 |
if (TraceThreadEvents) {
|
|
1260 |
tty->print_cr("creating thread %p", this);
|
|
1261 |
}
|
|
1262 |
initialize();
|
|
1263 |
_is_attaching = false;
|
|
1264 |
set_entry_point(entry_point);
|
|
1265 |
// Create the native thread itself.
|
|
1266 |
// %note runtime_23
|
|
1267 |
os::ThreadType thr_type = os::java_thread;
|
|
1268 |
thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread :
|
|
1269 |
os::java_thread;
|
|
1270 |
os::create_thread(this, thr_type, stack_sz);
|
|
1271 |
|
|
1272 |
// The _osthread may be NULL here because we ran out of memory (too many threads active).
|
|
1273 |
// We need to throw and OutOfMemoryError - however we cannot do this here because the caller
|
|
1274 |
// may hold a lock and all locks must be unlocked before throwing the exception (throwing
|
|
1275 |
// the exception consists of creating the exception object & initializing it, initialization
|
|
1276 |
// will leave the VM via a JavaCall and then all locks must be unlocked).
|
|
1277 |
//
|
|
1278 |
// The thread is still suspended when we reach here. Thread must be explicit started
|
|
1279 |
// by creator! Furthermore, the thread must also explicitly be added to the Threads list
|
|
1280 |
// by calling Threads:add. The reason why this is not done here, is because the thread
|
|
1281 |
// object must be fully initialized (take a look at JVM_Start)
|
|
1282 |
}
|
|
1283 |
|
|
1284 |
JavaThread::~JavaThread() {
|
|
1285 |
if (TraceThreadEvents) {
|
|
1286 |
tty->print_cr("terminate thread %p", this);
|
|
1287 |
}
|
|
1288 |
|
|
1289 |
// JSR166 -- return the parker to the free list
|
|
1290 |
Parker::Release(_parker);
|
|
1291 |
_parker = NULL ;
|
|
1292 |
|
|
1293 |
// Free any remaining previous UnrollBlock
|
|
1294 |
vframeArray* old_array = vframe_array_last();
|
|
1295 |
|
|
1296 |
if (old_array != NULL) {
|
|
1297 |
Deoptimization::UnrollBlock* old_info = old_array->unroll_block();
|
|
1298 |
old_array->set_unroll_block(NULL);
|
|
1299 |
delete old_info;
|
|
1300 |
delete old_array;
|
|
1301 |
}
|
|
1302 |
|
|
1303 |
GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals();
|
|
1304 |
if (deferred != NULL) {
|
|
1305 |
// This can only happen if thread is destroyed before deoptimization occurs.
|
|
1306 |
assert(deferred->length() != 0, "empty array!");
|
|
1307 |
do {
|
|
1308 |
jvmtiDeferredLocalVariableSet* dlv = deferred->at(0);
|
|
1309 |
deferred->remove_at(0);
|
|
1310 |
// individual jvmtiDeferredLocalVariableSet are CHeapObj's
|
|
1311 |
delete dlv;
|
|
1312 |
} while (deferred->length() != 0);
|
|
1313 |
delete deferred;
|
|
1314 |
}
|
|
1315 |
|
|
1316 |
// All Java related clean up happens in exit
|
|
1317 |
ThreadSafepointState::destroy(this);
|
|
1318 |
if (_thread_profiler != NULL) delete _thread_profiler;
|
|
1319 |
if (_thread_stat != NULL) delete _thread_stat;
|
|
1320 |
|
|
1321 |
if (jvmti_thread_state() != NULL) {
|
|
1322 |
JvmtiExport::cleanup_thread(this);
|
|
1323 |
}
|
|
1324 |
}
|
|
1325 |
|
|
1326 |
|
|
1327 |
// The first routine called by a new Java thread
|
|
1328 |
void JavaThread::run() {
|
|
1329 |
// initialize thread-local alloc buffer related fields
|
|
1330 |
this->initialize_tlab();
|
|
1331 |
|
|
1332 |
// used to test validitity of stack trace backs
|
|
1333 |
this->record_base_of_stack_pointer();
|
|
1334 |
|
|
1335 |
// Record real stack base and size.
|
|
1336 |
this->record_stack_base_and_size();
|
|
1337 |
|
|
1338 |
// Initialize thread local storage; set before calling MutexLocker
|
|
1339 |
this->initialize_thread_local_storage();
|
|
1340 |
|
|
1341 |
this->create_stack_guard_pages();
|
|
1342 |
|
|
1343 |
// Thread is now sufficient initialized to be handled by the safepoint code as being
|
|
1344 |
// in the VM. Change thread state from _thread_new to _thread_in_vm
|
|
1345 |
ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm);
|
|
1346 |
|
|
1347 |
assert(JavaThread::current() == this, "sanity check");
|
|
1348 |
assert(!Thread::current()->owns_locks(), "sanity check");
|
|
1349 |
|
|
1350 |
DTRACE_THREAD_PROBE(start, this);
|
|
1351 |
|
|
1352 |
// This operation might block. We call that after all safepoint checks for a new thread has
|
|
1353 |
// been completed.
|
|
1354 |
this->set_active_handles(JNIHandleBlock::allocate_block());
|
|
1355 |
|
|
1356 |
if (JvmtiExport::should_post_thread_life()) {
|
|
1357 |
JvmtiExport::post_thread_start(this);
|
|
1358 |
}
|
|
1359 |
|
|
1360 |
// We call another function to do the rest so we are sure that the stack addresses used
|
|
1361 |
// from there will be lower than the stack base just computed
|
|
1362 |
thread_main_inner();
|
|
1363 |
|
|
1364 |
// Note, thread is no longer valid at this point!
|
|
1365 |
}
|
|
1366 |
|
|
1367 |
|
|
1368 |
void JavaThread::thread_main_inner() {
|
|
1369 |
assert(JavaThread::current() == this, "sanity check");
|
|
1370 |
assert(this->threadObj() != NULL, "just checking");
|
|
1371 |
|
|
1372 |
// Execute thread entry point. If this thread is being asked to restart,
|
|
1373 |
// or has been stopped before starting, do not reexecute entry point.
|
|
1374 |
// Note: Due to JVM_StopThread we can have pending exceptions already!
|
|
1375 |
if (!this->has_pending_exception() && !java_lang_Thread::is_stillborn(this->threadObj())) {
|
|
1376 |
// enter the thread's entry point only if we have no pending exceptions
|
|
1377 |
HandleMark hm(this);
|
|
1378 |
this->entry_point()(this, this);
|
|
1379 |
}
|
|
1380 |
|
|
1381 |
DTRACE_THREAD_PROBE(stop, this);
|
|
1382 |
|
|
1383 |
this->exit(false);
|
|
1384 |
delete this;
|
|
1385 |
}
|
|
1386 |
|
|
1387 |
|
|
1388 |
static void ensure_join(JavaThread* thread) {
|
|
1389 |
// We do not need to grap the Threads_lock, since we are operating on ourself.
|
|
1390 |
Handle threadObj(thread, thread->threadObj());
|
|
1391 |
assert(threadObj.not_null(), "java thread object must exist");
|
|
1392 |
ObjectLocker lock(threadObj, thread);
|
|
1393 |
// Ignore pending exception (ThreadDeath), since we are exiting anyway
|
|
1394 |
thread->clear_pending_exception();
|
|
1395 |
// It is of profound importance that we set the stillborn bit and reset the thread object,
|
|
1396 |
// before we do the notify. Since, changing these two variable will make JVM_IsAlive return
|
|
1397 |
// false. So in case another thread is doing a join on this thread , it will detect that the thread
|
|
1398 |
// is dead when it gets notified.
|
|
1399 |
java_lang_Thread::set_stillborn(threadObj());
|
|
1400 |
// Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED.
|
|
1401 |
java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED);
|
|
1402 |
java_lang_Thread::set_thread(threadObj(), NULL);
|
|
1403 |
lock.notify_all(thread);
|
|
1404 |
// Ignore pending exception (ThreadDeath), since we are exiting anyway
|
|
1405 |
thread->clear_pending_exception();
|
|
1406 |
}
|
|
1407 |
|
|
1408 |
// For any new cleanup additions, please check to see if they need to be applied to
|
|
1409 |
// cleanup_failed_attach_current_thread as well.
|
|
1410 |
void JavaThread::exit(bool destroy_vm, ExitType exit_type) {
|
|
1411 |
assert(this == JavaThread::current(), "thread consistency check");
|
|
1412 |
if (!InitializeJavaLangSystem) return;
|
|
1413 |
|
|
1414 |
HandleMark hm(this);
|
|
1415 |
Handle uncaught_exception(this, this->pending_exception());
|
|
1416 |
this->clear_pending_exception();
|
|
1417 |
Handle threadObj(this, this->threadObj());
|
|
1418 |
assert(threadObj.not_null(), "Java thread object should be created");
|
|
1419 |
|
|
1420 |
if (get_thread_profiler() != NULL) {
|
|
1421 |
get_thread_profiler()->disengage();
|
|
1422 |
ResourceMark rm;
|
|
1423 |
get_thread_profiler()->print(get_thread_name());
|
|
1424 |
}
|
|
1425 |
|
|
1426 |
|
|
1427 |
// FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place
|
|
1428 |
{
|
|
1429 |
EXCEPTION_MARK;
|
|
1430 |
|
|
1431 |
CLEAR_PENDING_EXCEPTION;
|
|
1432 |
}
|
|
1433 |
// FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This
|
|
1434 |
// has to be fixed by a runtime query method
|
|
1435 |
if (!destroy_vm || JDK_Version::is_jdk12x_version()) {
|
|
1436 |
// JSR-166: change call from from ThreadGroup.uncaughtException to
|
|
1437 |
// java.lang.Thread.dispatchUncaughtException
|
|
1438 |
if (uncaught_exception.not_null()) {
|
|
1439 |
Handle group(this, java_lang_Thread::threadGroup(threadObj()));
|
|
1440 |
Events::log("uncaught exception INTPTR_FORMAT " " INTPTR_FORMAT " " INTPTR_FORMAT",
|
|
1441 |
(address)uncaught_exception(), (address)threadObj(), (address)group());
|
|
1442 |
{
|
|
1443 |
EXCEPTION_MARK;
|
|
1444 |
// Check if the method Thread.dispatchUncaughtException() exists. If so
|
|
1445 |
// call it. Otherwise we have an older library without the JSR-166 changes,
|
|
1446 |
// so call ThreadGroup.uncaughtException()
|
|
1447 |
KlassHandle recvrKlass(THREAD, threadObj->klass());
|
|
1448 |
CallInfo callinfo;
|
|
1449 |
KlassHandle thread_klass(THREAD, SystemDictionary::thread_klass());
|
|
1450 |
LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass,
|
|
1451 |
vmSymbolHandles::dispatchUncaughtException_name(),
|
|
1452 |
vmSymbolHandles::throwable_void_signature(),
|
|
1453 |
KlassHandle(), false, false, THREAD);
|
|
1454 |
CLEAR_PENDING_EXCEPTION;
|
|
1455 |
methodHandle method = callinfo.selected_method();
|
|
1456 |
if (method.not_null()) {
|
|
1457 |
JavaValue result(T_VOID);
|
|
1458 |
JavaCalls::call_virtual(&result,
|
|
1459 |
threadObj, thread_klass,
|
|
1460 |
vmSymbolHandles::dispatchUncaughtException_name(),
|
|
1461 |
vmSymbolHandles::throwable_void_signature(),
|
|
1462 |
uncaught_exception,
|
|
1463 |
THREAD);
|
|
1464 |
} else {
|
|
1465 |
KlassHandle thread_group(THREAD, SystemDictionary::threadGroup_klass());
|
|
1466 |
JavaValue result(T_VOID);
|
|
1467 |
JavaCalls::call_virtual(&result,
|
|
1468 |
group, thread_group,
|
|
1469 |
vmSymbolHandles::uncaughtException_name(),
|
|
1470 |
vmSymbolHandles::thread_throwable_void_signature(),
|
|
1471 |
threadObj, // Arg 1
|
|
1472 |
uncaught_exception, // Arg 2
|
|
1473 |
THREAD);
|
|
1474 |
}
|
|
1475 |
CLEAR_PENDING_EXCEPTION;
|
|
1476 |
}
|
|
1477 |
}
|
|
1478 |
|
|
1479 |
// Call Thread.exit(). We try 3 times in case we got another Thread.stop during
|
|
1480 |
// the execution of the method. If that is not enough, then we don't really care. Thread.stop
|
|
1481 |
// is deprecated anyhow.
|
|
1482 |
{ int count = 3;
|
|
1483 |
while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) {
|
|
1484 |
EXCEPTION_MARK;
|
|
1485 |
JavaValue result(T_VOID);
|
|
1486 |
KlassHandle thread_klass(THREAD, SystemDictionary::thread_klass());
|
|
1487 |
JavaCalls::call_virtual(&result,
|
|
1488 |
threadObj, thread_klass,
|
|
1489 |
vmSymbolHandles::exit_method_name(),
|
|
1490 |
vmSymbolHandles::void_method_signature(),
|
|
1491 |
THREAD);
|
|
1492 |
CLEAR_PENDING_EXCEPTION;
|
|
1493 |
}
|
|
1494 |
}
|
|
1495 |
|
|
1496 |
// notify JVMTI
|
|
1497 |
if (JvmtiExport::should_post_thread_life()) {
|
|
1498 |
JvmtiExport::post_thread_end(this);
|
|
1499 |
}
|
|
1500 |
|
|
1501 |
// We have notified the agents that we are exiting, before we go on,
|
|
1502 |
// we must check for a pending external suspend request and honor it
|
|
1503 |
// in order to not surprise the thread that made the suspend request.
|
|
1504 |
while (true) {
|
|
1505 |
{
|
|
1506 |
MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
|
|
1507 |
if (!is_external_suspend()) {
|
|
1508 |
set_terminated(_thread_exiting);
|
|
1509 |
ThreadService::current_thread_exiting(this);
|
|
1510 |
break;
|
|
1511 |
}
|
|
1512 |
// Implied else:
|
|
1513 |
// Things get a little tricky here. We have a pending external
|
|
1514 |
// suspend request, but we are holding the SR_lock so we
|
|
1515 |
// can't just self-suspend. So we temporarily drop the lock
|
|
1516 |
// and then self-suspend.
|
|
1517 |
}
|
|
1518 |
|
|
1519 |
ThreadBlockInVM tbivm(this);
|
|
1520 |
java_suspend_self();
|
|
1521 |
|
|
1522 |
// We're done with this suspend request, but we have to loop around
|
|
1523 |
// and check again. Eventually we will get SR_lock without a pending
|
|
1524 |
// external suspend request and will be able to mark ourselves as
|
|
1525 |
// exiting.
|
|
1526 |
}
|
|
1527 |
// no more external suspends are allowed at this point
|
|
1528 |
} else {
|
|
1529 |
// before_exit() has already posted JVMTI THREAD_END events
|
|
1530 |
}
|
|
1531 |
|
|
1532 |
// Notify waiters on thread object. This has to be done after exit() is called
|
|
1533 |
// on the thread (if the thread is the last thread in a daemon ThreadGroup the
|
|
1534 |
// group should have the destroyed bit set before waiters are notified).
|
|
1535 |
ensure_join(this);
|
|
1536 |
assert(!this->has_pending_exception(), "ensure_join should have cleared");
|
|
1537 |
|
|
1538 |
// 6282335 JNI DetachCurrentThread spec states that all Java monitors
|
|
1539 |
// held by this thread must be released. A detach operation must only
|
|
1540 |
// get here if there are no Java frames on the stack. Therefore, any
|
|
1541 |
// owned monitors at this point MUST be JNI-acquired monitors which are
|
|
1542 |
// pre-inflated and in the monitor cache.
|
|
1543 |
//
|
|
1544 |
// ensure_join() ignores IllegalThreadStateExceptions, and so does this.
|
|
1545 |
if (exit_type == jni_detach && JNIDetachReleasesMonitors) {
|
|
1546 |
assert(!this->has_last_Java_frame(), "detaching with Java frames?");
|
|
1547 |
ObjectSynchronizer::release_monitors_owned_by_thread(this);
|
|
1548 |
assert(!this->has_pending_exception(), "release_monitors should have cleared");
|
|
1549 |
}
|
|
1550 |
|
|
1551 |
// These things needs to be done while we are still a Java Thread. Make sure that thread
|
|
1552 |
// is in a consistent state, in case GC happens
|
|
1553 |
assert(_privileged_stack_top == NULL, "must be NULL when we get here");
|
|
1554 |
|
|
1555 |
if (active_handles() != NULL) {
|
|
1556 |
JNIHandleBlock* block = active_handles();
|
|
1557 |
set_active_handles(NULL);
|
|
1558 |
JNIHandleBlock::release_block(block);
|
|
1559 |
}
|
|
1560 |
|
|
1561 |
if (free_handle_block() != NULL) {
|
|
1562 |
JNIHandleBlock* block = free_handle_block();
|
|
1563 |
set_free_handle_block(NULL);
|
|
1564 |
JNIHandleBlock::release_block(block);
|
|
1565 |
}
|
|
1566 |
|
|
1567 |
// These have to be removed while this is still a valid thread.
|
|
1568 |
remove_stack_guard_pages();
|
|
1569 |
|
|
1570 |
if (UseTLAB) {
|
|
1571 |
tlab().make_parsable(true); // retire TLAB
|
|
1572 |
}
|
|
1573 |
|
|
1574 |
// Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread
|
|
1575 |
Threads::remove(this);
|
|
1576 |
}
|
|
1577 |
|
|
1578 |
void JavaThread::cleanup_failed_attach_current_thread() {
|
|
1579 |
|
|
1580 |
if (get_thread_profiler() != NULL) {
|
|
1581 |
get_thread_profiler()->disengage();
|
|
1582 |
ResourceMark rm;
|
|
1583 |
get_thread_profiler()->print(get_thread_name());
|
|
1584 |
}
|
|
1585 |
|
|
1586 |
if (active_handles() != NULL) {
|
|
1587 |
JNIHandleBlock* block = active_handles();
|
|
1588 |
set_active_handles(NULL);
|
|
1589 |
JNIHandleBlock::release_block(block);
|
|
1590 |
}
|
|
1591 |
|
|
1592 |
if (free_handle_block() != NULL) {
|
|
1593 |
JNIHandleBlock* block = free_handle_block();
|
|
1594 |
set_free_handle_block(NULL);
|
|
1595 |
JNIHandleBlock::release_block(block);
|
|
1596 |
}
|
|
1597 |
|
|
1598 |
if (UseTLAB) {
|
|
1599 |
tlab().make_parsable(true); // retire TLAB, if any
|
|
1600 |
}
|
|
1601 |
|
|
1602 |
Threads::remove(this);
|
|
1603 |
delete this;
|
|
1604 |
}
|
|
1605 |
|
|
1606 |
|
|
1607 |
JavaThread* JavaThread::active() {
|
|
1608 |
Thread* thread = ThreadLocalStorage::thread();
|
|
1609 |
assert(thread != NULL, "just checking");
|
|
1610 |
if (thread->is_Java_thread()) {
|
|
1611 |
return (JavaThread*) thread;
|
|
1612 |
} else {
|
|
1613 |
assert(thread->is_VM_thread(), "this must be a vm thread");
|
|
1614 |
VM_Operation* op = ((VMThread*) thread)->vm_operation();
|
|
1615 |
JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread();
|
|
1616 |
assert(ret->is_Java_thread(), "must be a Java thread");
|
|
1617 |
return ret;
|
|
1618 |
}
|
|
1619 |
}
|
|
1620 |
|
|
1621 |
bool JavaThread::is_lock_owned(address adr) const {
|
|
1622 |
if (lock_is_in_stack(adr)) return true;
|
|
1623 |
|
|
1624 |
for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) {
|
|
1625 |
if (chunk->contains(adr)) return true;
|
|
1626 |
}
|
|
1627 |
|
|
1628 |
return false;
|
|
1629 |
}
|
|
1630 |
|
|
1631 |
|
|
1632 |
void JavaThread::add_monitor_chunk(MonitorChunk* chunk) {
|
|
1633 |
chunk->set_next(monitor_chunks());
|
|
1634 |
set_monitor_chunks(chunk);
|
|
1635 |
}
|
|
1636 |
|
|
1637 |
void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) {
|
|
1638 |
guarantee(monitor_chunks() != NULL, "must be non empty");
|
|
1639 |
if (monitor_chunks() == chunk) {
|
|
1640 |
set_monitor_chunks(chunk->next());
|
|
1641 |
} else {
|
|
1642 |
MonitorChunk* prev = monitor_chunks();
|
|
1643 |
while (prev->next() != chunk) prev = prev->next();
|
|
1644 |
prev->set_next(chunk->next());
|
|
1645 |
}
|
|
1646 |
}
|
|
1647 |
|
|
1648 |
// JVM support.
|
|
1649 |
|
|
1650 |
// Note: this function shouldn't block if it's called in
|
|
1651 |
// _thread_in_native_trans state (such as from
|
|
1652 |
// check_special_condition_for_native_trans()).
|
|
1653 |
void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) {
|
|
1654 |
|
|
1655 |
if (has_last_Java_frame() && has_async_condition()) {
|
|
1656 |
// If we are at a polling page safepoint (not a poll return)
|
|
1657 |
// then we must defer async exception because live registers
|
|
1658 |
// will be clobbered by the exception path. Poll return is
|
|
1659 |
// ok because the call we a returning from already collides
|
|
1660 |
// with exception handling registers and so there is no issue.
|
|
1661 |
// (The exception handling path kills call result registers but
|
|
1662 |
// this is ok since the exception kills the result anyway).
|
|
1663 |
|
|
1664 |
if (is_at_poll_safepoint()) {
|
|
1665 |
// if the code we are returning to has deoptimized we must defer
|
|
1666 |
// the exception otherwise live registers get clobbered on the
|
|
1667 |
// exception path before deoptimization is able to retrieve them.
|
|
1668 |
//
|
|
1669 |
RegisterMap map(this, false);
|
|
1670 |
frame caller_fr = last_frame().sender(&map);
|
|
1671 |
assert(caller_fr.is_compiled_frame(), "what?");
|
|
1672 |
if (caller_fr.is_deoptimized_frame()) {
|
|
1673 |
if (TraceExceptions) {
|
|
1674 |
ResourceMark rm;
|
|
1675 |
tty->print_cr("deferred async exception at compiled safepoint");
|
|
1676 |
}
|
|
1677 |
return;
|
|
1678 |
}
|
|
1679 |
}
|
|
1680 |
}
|
|
1681 |
|
|
1682 |
JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition();
|
|
1683 |
if (condition == _no_async_condition) {
|
|
1684 |
// Conditions have changed since has_special_runtime_exit_condition()
|
|
1685 |
// was called:
|
|
1686 |
// - if we were here only because of an external suspend request,
|
|
1687 |
// then that was taken care of above (or cancelled) so we are done
|
|
1688 |
// - if we were here because of another async request, then it has
|
|
1689 |
// been cleared between the has_special_runtime_exit_condition()
|
|
1690 |
// and now so again we are done
|
|
1691 |
return;
|
|
1692 |
}
|
|
1693 |
|
|
1694 |
// Check for pending async. exception
|
|
1695 |
if (_pending_async_exception != NULL) {
|
|
1696 |
// Only overwrite an already pending exception, if it is not a threadDeath.
|
|
1697 |
if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::threaddeath_klass())) {
|
|
1698 |
|
|
1699 |
// We cannot call Exceptions::_throw(...) here because we cannot block
|
|
1700 |
set_pending_exception(_pending_async_exception, __FILE__, __LINE__);
|
|
1701 |
|
|
1702 |
if (TraceExceptions) {
|
|
1703 |
ResourceMark rm;
|
|
1704 |
tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this);
|
|
1705 |
if (has_last_Java_frame() ) {
|
|
1706 |
frame f = last_frame();
|
|
1707 |
tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp());
|
|
1708 |
}
|
|
1709 |
tty->print_cr(" of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name());
|
|
1710 |
}
|
|
1711 |
_pending_async_exception = NULL;
|
|
1712 |
clear_has_async_exception();
|
|
1713 |
}
|
|
1714 |
}
|
|
1715 |
|
|
1716 |
if (check_unsafe_error &&
|
|
1717 |
condition == _async_unsafe_access_error && !has_pending_exception()) {
|
|
1718 |
condition = _no_async_condition; // done
|
|
1719 |
switch (thread_state()) {
|
|
1720 |
case _thread_in_vm:
|
|
1721 |
{
|
|
1722 |
JavaThread* THREAD = this;
|
|
1723 |
THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation");
|
|
1724 |
}
|
|
1725 |
case _thread_in_native:
|
|
1726 |
{
|
|
1727 |
ThreadInVMfromNative tiv(this);
|
|
1728 |
JavaThread* THREAD = this;
|
|
1729 |
THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation");
|
|
1730 |
}
|
|
1731 |
case _thread_in_Java:
|
|
1732 |
{
|
|
1733 |
ThreadInVMfromJava tiv(this);
|
|
1734 |
JavaThread* THREAD = this;
|
|
1735 |
THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code");
|
|
1736 |
}
|
|
1737 |
default:
|
|
1738 |
ShouldNotReachHere();
|
|
1739 |
}
|
|
1740 |
}
|
|
1741 |
|
|
1742 |
assert(condition == _no_async_condition || has_pending_exception() ||
|
|
1743 |
(!check_unsafe_error && condition == _async_unsafe_access_error),
|
|
1744 |
"must have handled the async condition, if no exception");
|
|
1745 |
}
|
|
1746 |
|
|
1747 |
void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) {
|
|
1748 |
//
|
|
1749 |
// Check for pending external suspend. Internal suspend requests do
|
|
1750 |
// not use handle_special_runtime_exit_condition().
|
|
1751 |
// If JNIEnv proxies are allowed, don't self-suspend if the target
|
|
1752 |
// thread is not the current thread. In older versions of jdbx, jdbx
|
|
1753 |
// threads could call into the VM with another thread's JNIEnv so we
|
|
1754 |
// can be here operating on behalf of a suspended thread (4432884).
|
|
1755 |
bool do_self_suspend = is_external_suspend_with_lock();
|
|
1756 |
if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) {
|
|
1757 |
//
|
|
1758 |
// Because thread is external suspended the safepoint code will count
|
|
1759 |
// thread as at a safepoint. This can be odd because we can be here
|
|
1760 |
// as _thread_in_Java which would normally transition to _thread_blocked
|
|
1761 |
// at a safepoint. We would like to mark the thread as _thread_blocked
|
|
1762 |
// before calling java_suspend_self like all other callers of it but
|
|
1763 |
// we must then observe proper safepoint protocol. (We can't leave
|
|
1764 |
// _thread_blocked with a safepoint in progress). However we can be
|
|
1765 |
// here as _thread_in_native_trans so we can't use a normal transition
|
|
1766 |
// constructor/destructor pair because they assert on that type of
|
|
1767 |
// transition. We could do something like:
|
|
1768 |
//
|
|
1769 |
// JavaThreadState state = thread_state();
|
|
1770 |
// set_thread_state(_thread_in_vm);
|
|
1771 |
// {
|
|
1772 |
// ThreadBlockInVM tbivm(this);
|
|
1773 |
// java_suspend_self()
|
|
1774 |
// }
|
|
1775 |
// set_thread_state(_thread_in_vm_trans);
|
|
1776 |
// if (safepoint) block;
|
|
1777 |
// set_thread_state(state);
|
|
1778 |
//
|
|
1779 |
// but that is pretty messy. Instead we just go with the way the
|
|
1780 |
// code has worked before and note that this is the only path to
|
|
1781 |
// java_suspend_self that doesn't put the thread in _thread_blocked
|
|
1782 |
// mode.
|
|
1783 |
|
|
1784 |
frame_anchor()->make_walkable(this);
|
|
1785 |
java_suspend_self();
|
|
1786 |
|
|
1787 |
// We might be here for reasons in addition to the self-suspend request
|
|
1788 |
// so check for other async requests.
|
|
1789 |
}
|
|
1790 |
|
|
1791 |
if (check_asyncs) {
|
|
1792 |
check_and_handle_async_exceptions();
|
|
1793 |
}
|
|
1794 |
}
|
|
1795 |
|
|
1796 |
void JavaThread::send_thread_stop(oop java_throwable) {
|
|
1797 |
assert(Thread::current()->is_VM_thread(), "should be in the vm thread");
|
|
1798 |
assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code");
|
|
1799 |
assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped");
|
|
1800 |
|
|
1801 |
// Do not throw asynchronous exceptions against the compiler thread
|
|
1802 |
// (the compiler thread should not be a Java thread -- fix in 1.4.2)
|
|
1803 |
if (is_Compiler_thread()) return;
|
|
1804 |
|
|
1805 |
// This is a change from JDK 1.1, but JDK 1.2 will also do it:
|
|
1806 |
if (java_throwable->is_a(SystemDictionary::threaddeath_klass())) {
|
|
1807 |
java_lang_Thread::set_stillborn(threadObj());
|
|
1808 |
}
|
|
1809 |
|
|
1810 |
{
|
|
1811 |
// Actually throw the Throwable against the target Thread - however
|
|
1812 |
// only if there is no thread death exception installed already.
|
|
1813 |
if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::threaddeath_klass())) {
|
|
1814 |
// If the topmost frame is a runtime stub, then we are calling into
|
|
1815 |
// OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..)
|
|
1816 |
// must deoptimize the caller before continuing, as the compiled exception handler table
|
|
1817 |
// may not be valid
|
|
1818 |
if (has_last_Java_frame()) {
|
|
1819 |
frame f = last_frame();
|
|
1820 |
if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) {
|
|
1821 |
// BiasedLocking needs an updated RegisterMap for the revoke monitors pass
|
|
1822 |
RegisterMap reg_map(this, UseBiasedLocking);
|
|
1823 |
frame compiled_frame = f.sender(®_map);
|
|
1824 |
if (compiled_frame.can_be_deoptimized()) {
|
|
1825 |
Deoptimization::deoptimize(this, compiled_frame, ®_map);
|
|
1826 |
}
|
|
1827 |
}
|
|
1828 |
}
|
|
1829 |
|
|
1830 |
// Set async. pending exception in thread.
|
|
1831 |
set_pending_async_exception(java_throwable);
|
|
1832 |
|
|
1833 |
if (TraceExceptions) {
|
|
1834 |
ResourceMark rm;
|
|
1835 |
tty->print_cr("Pending Async. exception installed of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name());
|
|
1836 |
}
|
|
1837 |
// for AbortVMOnException flag
|
|
1838 |
NOT_PRODUCT(Exceptions::debug_check_abort(instanceKlass::cast(_pending_async_exception->klass())->external_name()));
|
|
1839 |
}
|
|
1840 |
}
|
|
1841 |
|
|
1842 |
|
|
1843 |
// Interrupt thread so it will wake up from a potential wait()
|
|
1844 |
Thread::interrupt(this);
|
|
1845 |
}
|
|
1846 |
|
|
1847 |
// External suspension mechanism.
|
|
1848 |
//
|
|
1849 |
// Tell the VM to suspend a thread when ever it knows that it does not hold on
|
|
1850 |
// to any VM_locks and it is at a transition
|
|
1851 |
// Self-suspension will happen on the transition out of the vm.
|
|
1852 |
// Catch "this" coming in from JNIEnv pointers when the thread has been freed
|
|
1853 |
//
|
|
1854 |
// Guarantees on return:
|
|
1855 |
// + Target thread will not execute any new bytecode (that's why we need to
|
|
1856 |
// force a safepoint)
|
|
1857 |
// + Target thread will not enter any new monitors
|
|
1858 |
//
|
|
1859 |
void JavaThread::java_suspend() {
|
|
1860 |
{ MutexLocker mu(Threads_lock);
|
|
1861 |
if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) {
|
|
1862 |
return;
|
|
1863 |
}
|
|
1864 |
}
|
|
1865 |
|
|
1866 |
{ MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
|
|
1867 |
if (!is_external_suspend()) {
|
|
1868 |
// a racing resume has cancelled us; bail out now
|
|
1869 |
return;
|
|
1870 |
}
|
|
1871 |
|
|
1872 |
// suspend is done
|
|
1873 |
uint32_t debug_bits = 0;
|
|
1874 |
// Warning: is_ext_suspend_completed() may temporarily drop the
|
|
1875 |
// SR_lock to allow the thread to reach a stable thread state if
|
|
1876 |
// it is currently in a transient thread state.
|
|
1877 |
if (is_ext_suspend_completed(false /* !called_by_wait */,
|
|
1878 |
SuspendRetryDelay, &debug_bits) ) {
|
|
1879 |
return;
|
|
1880 |
}
|
|
1881 |
}
|
|
1882 |
|
|
1883 |
VM_ForceSafepoint vm_suspend;
|
|
1884 |
VMThread::execute(&vm_suspend);
|
|
1885 |
}
|
|
1886 |
|
|
1887 |
// Part II of external suspension.
|
|
1888 |
// A JavaThread self suspends when it detects a pending external suspend
|
|
1889 |
// request. This is usually on transitions. It is also done in places
|
|
1890 |
// where continuing to the next transition would surprise the caller,
|
|
1891 |
// e.g., monitor entry.
|
|
1892 |
//
|
|
1893 |
// Returns the number of times that the thread self-suspended.
|
|
1894 |
//
|
|
1895 |
// Note: DO NOT call java_suspend_self() when you just want to block current
|
|
1896 |
// thread. java_suspend_self() is the second stage of cooperative
|
|
1897 |
// suspension for external suspend requests and should only be used
|
|
1898 |
// to complete an external suspend request.
|
|
1899 |
//
|
|
1900 |
int JavaThread::java_suspend_self() {
|
|
1901 |
int ret = 0;
|
|
1902 |
|
|
1903 |
// we are in the process of exiting so don't suspend
|
|
1904 |
if (is_exiting()) {
|
|
1905 |
clear_external_suspend();
|
|
1906 |
return ret;
|
|
1907 |
}
|
|
1908 |
|
|
1909 |
assert(_anchor.walkable() ||
|
|
1910 |
(is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()),
|
|
1911 |
"must have walkable stack");
|
|
1912 |
|
|
1913 |
MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
|
|
1914 |
|
|
1915 |
assert(!this->is_any_suspended(),
|
|
1916 |
"a thread trying to self-suspend should not already be suspended");
|
|
1917 |
|
|
1918 |
if (this->is_suspend_equivalent()) {
|
|
1919 |
// If we are self-suspending as a result of the lifting of a
|
|
1920 |
// suspend equivalent condition, then the suspend_equivalent
|
|
1921 |
// flag is not cleared until we set the ext_suspended flag so
|
|
1922 |
// that wait_for_ext_suspend_completion() returns consistent
|
|
1923 |
// results.
|
|
1924 |
this->clear_suspend_equivalent();
|
|
1925 |
}
|
|
1926 |
|
|
1927 |
// A racing resume may have cancelled us before we grabbed SR_lock
|
|
1928 |
// above. Or another external suspend request could be waiting for us
|
|
1929 |
// by the time we return from SR_lock()->wait(). The thread
|
|
1930 |
// that requested the suspension may already be trying to walk our
|
|
1931 |
// stack and if we return now, we can change the stack out from under
|
|
1932 |
// it. This would be a "bad thing (TM)" and cause the stack walker
|
|
1933 |
// to crash. We stay self-suspended until there are no more pending
|
|
1934 |
// external suspend requests.
|
|
1935 |
while (is_external_suspend()) {
|
|
1936 |
ret++;
|
|
1937 |
this->set_ext_suspended();
|
|
1938 |
|
|
1939 |
// _ext_suspended flag is cleared by java_resume()
|
|
1940 |
while (is_ext_suspended()) {
|
|
1941 |
this->SR_lock()->wait(Mutex::_no_safepoint_check_flag);
|
|
1942 |
}
|
|
1943 |
}
|
|
1944 |
|
|
1945 |
return ret;
|
|
1946 |
}
|
|
1947 |
|
|
1948 |
#ifdef ASSERT
|
|
1949 |
// verify the JavaThread has not yet been published in the Threads::list, and
|
|
1950 |
// hence doesn't need protection from concurrent access at this stage
|
|
1951 |
void JavaThread::verify_not_published() {
|
|
1952 |
if (!Threads_lock->owned_by_self()) {
|
|
1953 |
MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag);
|
|
1954 |
assert( !Threads::includes(this),
|
|
1955 |
"java thread shouldn't have been published yet!");
|
|
1956 |
}
|
|
1957 |
else {
|
|
1958 |
assert( !Threads::includes(this),
|
|
1959 |
"java thread shouldn't have been published yet!");
|
|
1960 |
}
|
|
1961 |
}
|
|
1962 |
#endif
|
|
1963 |
|
|
1964 |
// Slow path when the native==>VM/Java barriers detect a safepoint is in
|
|
1965 |
// progress or when _suspend_flags is non-zero.
|
|
1966 |
// Current thread needs to self-suspend if there is a suspend request and/or
|
|
1967 |
// block if a safepoint is in progress.
|
|
1968 |
// Async exception ISN'T checked.
|
|
1969 |
// Note only the ThreadInVMfromNative transition can call this function
|
|
1970 |
// directly and when thread state is _thread_in_native_trans
|
|
1971 |
void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) {
|
|
1972 |
assert(thread->thread_state() == _thread_in_native_trans, "wrong state");
|
|
1973 |
|
|
1974 |
JavaThread *curJT = JavaThread::current();
|
|
1975 |
bool do_self_suspend = thread->is_external_suspend();
|
|
1976 |
|
|
1977 |
assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition");
|
|
1978 |
|
|
1979 |
// If JNIEnv proxies are allowed, don't self-suspend if the target
|
|
1980 |
// thread is not the current thread. In older versions of jdbx, jdbx
|
|
1981 |
// threads could call into the VM with another thread's JNIEnv so we
|
|
1982 |
// can be here operating on behalf of a suspended thread (4432884).
|
|
1983 |
if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) {
|
|
1984 |
JavaThreadState state = thread->thread_state();
|
|
1985 |
|
|
1986 |
// We mark this thread_blocked state as a suspend-equivalent so
|
|
1987 |
// that a caller to is_ext_suspend_completed() won't be confused.
|
|
1988 |
// The suspend-equivalent state is cleared by java_suspend_self().
|
|
1989 |
thread->set_suspend_equivalent();
|
|
1990 |
|
|
1991 |
// If the safepoint code sees the _thread_in_native_trans state, it will
|
|
1992 |
// wait until the thread changes to other thread state. There is no
|
|
1993 |
// guarantee on how soon we can obtain the SR_lock and complete the
|
|
1994 |
// self-suspend request. It would be a bad idea to let safepoint wait for
|
|
1995 |
// too long. Temporarily change the state to _thread_blocked to
|
|
1996 |
// let the VM thread know that this thread is ready for GC. The problem
|
|
1997 |
// of changing thread state is that safepoint could happen just after
|
|
1998 |
// java_suspend_self() returns after being resumed, and VM thread will
|
|
1999 |
// see the _thread_blocked state. We must check for safepoint
|
|
2000 |
// after restoring the state and make sure we won't leave while a safepoint
|
|
2001 |
// is in progress.
|
|
2002 |
thread->set_thread_state(_thread_blocked);
|
|
2003 |
thread->java_suspend_self();
|
|
2004 |
thread->set_thread_state(state);
|
|
2005 |
// Make sure new state is seen by VM thread
|
|
2006 |
if (os::is_MP()) {
|
|
2007 |
if (UseMembar) {
|
|
2008 |
// Force a fence between the write above and read below
|
|
2009 |
OrderAccess::fence();
|
|
2010 |
} else {
|
|
2011 |
// Must use this rather than serialization page in particular on Windows
|
|
2012 |
InterfaceSupport::serialize_memory(thread);
|
|
2013 |
}
|
|
2014 |
}
|
|
2015 |
}
|
|
2016 |
|
|
2017 |
if (SafepointSynchronize::do_call_back()) {
|
|
2018 |
// If we are safepointing, then block the caller which may not be
|
|
2019 |
// the same as the target thread (see above).
|
|
2020 |
SafepointSynchronize::block(curJT);
|
|
2021 |
}
|
|
2022 |
|
|
2023 |
if (thread->is_deopt_suspend()) {
|
|
2024 |
thread->clear_deopt_suspend();
|
|
2025 |
RegisterMap map(thread, false);
|
|
2026 |
frame f = thread->last_frame();
|
|
2027 |
while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) {
|
|
2028 |
f = f.sender(&map);
|
|
2029 |
}
|
|
2030 |
if (f.id() == thread->must_deopt_id()) {
|
|
2031 |
thread->clear_must_deopt_id();
|
|
2032 |
// Since we know we're safe to deopt the current state is a safe state
|
|
2033 |
f.deoptimize(thread, true);
|
|
2034 |
} else {
|
|
2035 |
fatal("missed deoptimization!");
|
|
2036 |
}
|
|
2037 |
}
|
|
2038 |
}
|
|
2039 |
|
|
2040 |
// Slow path when the native==>VM/Java barriers detect a safepoint is in
|
|
2041 |
// progress or when _suspend_flags is non-zero.
|
|
2042 |
// Current thread needs to self-suspend if there is a suspend request and/or
|
|
2043 |
// block if a safepoint is in progress.
|
|
2044 |
// Also check for pending async exception (not including unsafe access error).
|
|
2045 |
// Note only the native==>VM/Java barriers can call this function and when
|
|
2046 |
// thread state is _thread_in_native_trans.
|
|
2047 |
void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) {
|
|
2048 |
check_safepoint_and_suspend_for_native_trans(thread);
|
|
2049 |
|
|
2050 |
if (thread->has_async_exception()) {
|
|
2051 |
// We are in _thread_in_native_trans state, don't handle unsafe
|
|
2052 |
// access error since that may block.
|
|
2053 |
thread->check_and_handle_async_exceptions(false);
|
|
2054 |
}
|
|
2055 |
}
|
|
2056 |
|
|
2057 |
// We need to guarantee the Threads_lock here, since resumes are not
|
|
2058 |
// allowed during safepoint synchronization
|
|
2059 |
// Can only resume from an external suspension
|
|
2060 |
void JavaThread::java_resume() {
|
|
2061 |
assert_locked_or_safepoint(Threads_lock);
|
|
2062 |
|
|
2063 |
// Sanity check: thread is gone, has started exiting or the thread
|
|
2064 |
// was not externally suspended.
|
|
2065 |
if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) {
|
|
2066 |
return;
|
|
2067 |
}
|
|
2068 |
|
|
2069 |
MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
|
|
2070 |
|
|
2071 |
clear_external_suspend();
|
|
2072 |
|
|
2073 |
if (is_ext_suspended()) {
|
|
2074 |
clear_ext_suspended();
|
|
2075 |
SR_lock()->notify_all();
|
|
2076 |
}
|
|
2077 |
}
|
|
2078 |
|
|
2079 |
void JavaThread::create_stack_guard_pages() {
|
|
2080 |
if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return;
|
|
2081 |
address low_addr = stack_base() - stack_size();
|
|
2082 |
size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size();
|
|
2083 |
|
|
2084 |
int allocate = os::allocate_stack_guard_pages();
|
|
2085 |
// warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len);
|
|
2086 |
|
|
2087 |
if (allocate && !os::commit_memory((char *) low_addr, len)) {
|
|
2088 |
warning("Attempt to allocate stack guard pages failed.");
|
|
2089 |
return;
|
|
2090 |
}
|
|
2091 |
|
|
2092 |
if (os::guard_memory((char *) low_addr, len)) {
|
|
2093 |
_stack_guard_state = stack_guard_enabled;
|
|
2094 |
} else {
|
|
2095 |
warning("Attempt to protect stack guard pages failed.");
|
|
2096 |
if (os::uncommit_memory((char *) low_addr, len)) {
|
|
2097 |
warning("Attempt to deallocate stack guard pages failed.");
|
|
2098 |
}
|
|
2099 |
}
|
|
2100 |
}
|
|
2101 |
|
|
2102 |
void JavaThread::remove_stack_guard_pages() {
|
|
2103 |
if (_stack_guard_state == stack_guard_unused) return;
|
|
2104 |
address low_addr = stack_base() - stack_size();
|
|
2105 |
size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size();
|
|
2106 |
|
|
2107 |
if (os::allocate_stack_guard_pages()) {
|
|
2108 |
if (os::uncommit_memory((char *) low_addr, len)) {
|
|
2109 |
_stack_guard_state = stack_guard_unused;
|
|
2110 |
} else {
|
|
2111 |
warning("Attempt to deallocate stack guard pages failed.");
|
|
2112 |
}
|
|
2113 |
} else {
|
|
2114 |
if (_stack_guard_state == stack_guard_unused) return;
|
|
2115 |
if (os::unguard_memory((char *) low_addr, len)) {
|
|
2116 |
_stack_guard_state = stack_guard_unused;
|
|
2117 |
} else {
|
|
2118 |
warning("Attempt to unprotect stack guard pages failed.");
|
|
2119 |
}
|
|
2120 |
}
|
|
2121 |
}
|
|
2122 |
|
|
2123 |
void JavaThread::enable_stack_yellow_zone() {
|
|
2124 |
assert(_stack_guard_state != stack_guard_unused, "must be using guard pages.");
|
|
2125 |
assert(_stack_guard_state != stack_guard_enabled, "already enabled");
|
|
2126 |
|
|
2127 |
// The base notation is from the stacks point of view, growing downward.
|
|
2128 |
// We need to adjust it to work correctly with guard_memory()
|
|
2129 |
address base = stack_yellow_zone_base() - stack_yellow_zone_size();
|
|
2130 |
|
|
2131 |
guarantee(base < stack_base(),"Error calculating stack yellow zone");
|
|
2132 |
guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone");
|
|
2133 |
|
|
2134 |
if (os::guard_memory((char *) base, stack_yellow_zone_size())) {
|
|
2135 |
_stack_guard_state = stack_guard_enabled;
|
|
2136 |
} else {
|
|
2137 |
warning("Attempt to guard stack yellow zone failed.");
|
|
2138 |
}
|
|
2139 |
enable_register_stack_guard();
|
|
2140 |
}
|
|
2141 |
|
|
2142 |
void JavaThread::disable_stack_yellow_zone() {
|
|
2143 |
assert(_stack_guard_state != stack_guard_unused, "must be using guard pages.");
|
|
2144 |
assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled");
|
|
2145 |
|
|
2146 |
// Simply return if called for a thread that does not use guard pages.
|
|
2147 |
if (_stack_guard_state == stack_guard_unused) return;
|
|
2148 |
|
|
2149 |
// The base notation is from the stacks point of view, growing downward.
|
|
2150 |
// We need to adjust it to work correctly with guard_memory()
|
|
2151 |
address base = stack_yellow_zone_base() - stack_yellow_zone_size();
|
|
2152 |
|
|
2153 |
if (os::unguard_memory((char *)base, stack_yellow_zone_size())) {
|
|
2154 |
_stack_guard_state = stack_guard_yellow_disabled;
|
|
2155 |
} else {
|
|
2156 |
warning("Attempt to unguard stack yellow zone failed.");
|
|
2157 |
}
|
|
2158 |
disable_register_stack_guard();
|
|
2159 |
}
|
|
2160 |
|
|
2161 |
void JavaThread::enable_stack_red_zone() {
|
|
2162 |
// The base notation is from the stacks point of view, growing downward.
|
|
2163 |
// We need to adjust it to work correctly with guard_memory()
|
|
2164 |
assert(_stack_guard_state != stack_guard_unused, "must be using guard pages.");
|
|
2165 |
address base = stack_red_zone_base() - stack_red_zone_size();
|
|
2166 |
|
|
2167 |
guarantee(base < stack_base(),"Error calculating stack red zone");
|
|
2168 |
guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone");
|
|
2169 |
|
|
2170 |
if(!os::guard_memory((char *) base, stack_red_zone_size())) {
|
|
2171 |
warning("Attempt to guard stack red zone failed.");
|
|
2172 |
}
|
|
2173 |
}
|
|
2174 |
|
|
2175 |
void JavaThread::disable_stack_red_zone() {
|
|
2176 |
// The base notation is from the stacks point of view, growing downward.
|
|
2177 |
// We need to adjust it to work correctly with guard_memory()
|
|
2178 |
assert(_stack_guard_state != stack_guard_unused, "must be using guard pages.");
|
|
2179 |
address base = stack_red_zone_base() - stack_red_zone_size();
|
|
2180 |
if (!os::unguard_memory((char *)base, stack_red_zone_size())) {
|
|
2181 |
warning("Attempt to unguard stack red zone failed.");
|
|
2182 |
}
|
|
2183 |
}
|
|
2184 |
|
|
2185 |
void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) {
|
|
2186 |
// ignore is there is no stack
|
|
2187 |
if (!has_last_Java_frame()) return;
|
|
2188 |
// traverse the stack frames. Starts from top frame.
|
|
2189 |
for(StackFrameStream fst(this); !fst.is_done(); fst.next()) {
|
|
2190 |
frame* fr = fst.current();
|
|
2191 |
f(fr, fst.register_map());
|
|
2192 |
}
|
|
2193 |
}
|
|
2194 |
|
|
2195 |
|
|
2196 |
#ifndef PRODUCT
|
|
2197 |
// Deoptimization
|
|
2198 |
// Function for testing deoptimization
|
|
2199 |
void JavaThread::deoptimize() {
|
|
2200 |
// BiasedLocking needs an updated RegisterMap for the revoke monitors pass
|
|
2201 |
StackFrameStream fst(this, UseBiasedLocking);
|
|
2202 |
bool deopt = false; // Dump stack only if a deopt actually happens.
|
|
2203 |
bool only_at = strlen(DeoptimizeOnlyAt) > 0;
|
|
2204 |
// Iterate over all frames in the thread and deoptimize
|
|
2205 |
for(; !fst.is_done(); fst.next()) {
|
|
2206 |
if(fst.current()->can_be_deoptimized()) {
|
|
2207 |
|
|
2208 |
if (only_at) {
|
|
2209 |
// Deoptimize only at particular bcis. DeoptimizeOnlyAt
|
|
2210 |
// consists of comma or carriage return separated numbers so
|
|
2211 |
// search for the current bci in that string.
|
|
2212 |
address pc = fst.current()->pc();
|
|
2213 |
nmethod* nm = (nmethod*) fst.current()->cb();
|
|
2214 |
ScopeDesc* sd = nm->scope_desc_at( pc);
|
|
2215 |
char buffer[8];
|
|
2216 |
jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci());
|
|
2217 |
size_t len = strlen(buffer);
|
|
2218 |
const char * found = strstr(DeoptimizeOnlyAt, buffer);
|
|
2219 |
while (found != NULL) {
|
|
2220 |
if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') &&
|
|
2221 |
(found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) {
|
|
2222 |
// Check that the bci found is bracketed by terminators.
|
|
2223 |
break;
|
|
2224 |
}
|
|
2225 |
found = strstr(found + 1, buffer);
|
|
2226 |
}
|
|
2227 |
if (!found) {
|
|
2228 |
continue;
|
|
2229 |
}
|
|
2230 |
}
|
|
2231 |
|
|
2232 |
if (DebugDeoptimization && !deopt) {
|
|
2233 |
deopt = true; // One-time only print before deopt
|
|
2234 |
tty->print_cr("[BEFORE Deoptimization]");
|
|
2235 |
trace_frames();
|
|
2236 |
trace_stack();
|
|
2237 |
}
|
|
2238 |
Deoptimization::deoptimize(this, *fst.current(), fst.register_map());
|
|
2239 |
}
|
|
2240 |
}
|
|
2241 |
|
|
2242 |
if (DebugDeoptimization && deopt) {
|
|
2243 |
tty->print_cr("[AFTER Deoptimization]");
|
|
2244 |
trace_frames();
|
|
2245 |
}
|
|
2246 |
}
|
|
2247 |
|
|
2248 |
|
|
2249 |
// Make zombies
|
|
2250 |
void JavaThread::make_zombies() {
|
|
2251 |
for(StackFrameStream fst(this); !fst.is_done(); fst.next()) {
|
|
2252 |
if (fst.current()->can_be_deoptimized()) {
|
|
2253 |
// it is a Java nmethod
|
|
2254 |
nmethod* nm = CodeCache::find_nmethod(fst.current()->pc());
|
|
2255 |
nm->make_not_entrant();
|
|
2256 |
}
|
|
2257 |
}
|
|
2258 |
}
|
|
2259 |
#endif // PRODUCT
|
|
2260 |
|
|
2261 |
|
|
2262 |
void JavaThread::deoptimized_wrt_marked_nmethods() {
|
|
2263 |
if (!has_last_Java_frame()) return;
|
|
2264 |
// BiasedLocking needs an updated RegisterMap for the revoke monitors pass
|
|
2265 |
StackFrameStream fst(this, UseBiasedLocking);
|
|
2266 |
for(; !fst.is_done(); fst.next()) {
|
|
2267 |
if (fst.current()->should_be_deoptimized()) {
|
|
2268 |
Deoptimization::deoptimize(this, *fst.current(), fst.register_map());
|
|
2269 |
}
|
|
2270 |
}
|
|
2271 |
}
|
|
2272 |
|
|
2273 |
|
|
2274 |
// GC support
|
|
2275 |
static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); }
|
|
2276 |
|
|
2277 |
void JavaThread::gc_epilogue() {
|
|
2278 |
frames_do(frame_gc_epilogue);
|
|
2279 |
}
|
|
2280 |
|
|
2281 |
|
|
2282 |
static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); }
|
|
2283 |
|
|
2284 |
void JavaThread::gc_prologue() {
|
|
2285 |
frames_do(frame_gc_prologue);
|
|
2286 |
}
|
|
2287 |
|
|
2288 |
|
|
2289 |
void JavaThread::oops_do(OopClosure* f) {
|
|
2290 |
// The ThreadProfiler oops_do is done from FlatProfiler::oops_do
|
|
2291 |
// since there may be more than one thread using each ThreadProfiler.
|
|
2292 |
|
|
2293 |
// Traverse the GCHandles
|
|
2294 |
Thread::oops_do(f);
|
|
2295 |
|
|
2296 |
assert( (!has_last_Java_frame() && java_call_counter() == 0) ||
|
|
2297 |
(has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!");
|
|
2298 |
|
|
2299 |
if (has_last_Java_frame()) {
|
|
2300 |
|
|
2301 |
// Traverse the privileged stack
|
|
2302 |
if (_privileged_stack_top != NULL) {
|
|
2303 |
_privileged_stack_top->oops_do(f);
|
|
2304 |
}
|
|
2305 |
|
|
2306 |
// traverse the registered growable array
|
|
2307 |
if (_array_for_gc != NULL) {
|
|
2308 |
for (int index = 0; index < _array_for_gc->length(); index++) {
|
|
2309 |
f->do_oop(_array_for_gc->adr_at(index));
|
|
2310 |
}
|
|
2311 |
}
|
|
2312 |
|
|
2313 |
// Traverse the monitor chunks
|
|
2314 |
for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) {
|
|
2315 |
chunk->oops_do(f);
|
|
2316 |
}
|
|
2317 |
|
|
2318 |
// Traverse the execution stack
|
|
2319 |
for(StackFrameStream fst(this); !fst.is_done(); fst.next()) {
|
|
2320 |
fst.current()->oops_do(f, fst.register_map());
|
|
2321 |
}
|
|
2322 |
}
|
|
2323 |
|
|
2324 |
// callee_target is never live across a gc point so NULL it here should
|
|
2325 |
// it still contain a methdOop.
|
|
2326 |
|
|
2327 |
set_callee_target(NULL);
|
|
2328 |
|
|
2329 |
assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!");
|
|
2330 |
// If we have deferred set_locals there might be oops waiting to be
|
|
2331 |
// written
|
|
2332 |
GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals();
|
|
2333 |
if (list != NULL) {
|
|
2334 |
for (int i = 0; i < list->length(); i++) {
|
|
2335 |
list->at(i)->oops_do(f);
|
|
2336 |
}
|
|
2337 |
}
|
|
2338 |
|
|
2339 |
// Traverse instance variables at the end since the GC may be moving things
|
|
2340 |
// around using this function
|
|
2341 |
f->do_oop((oop*) &_threadObj);
|
|
2342 |
f->do_oop((oop*) &_vm_result);
|
|
2343 |
f->do_oop((oop*) &_vm_result_2);
|
|
2344 |
f->do_oop((oop*) &_exception_oop);
|
|
2345 |
f->do_oop((oop*) &_pending_async_exception);
|
|
2346 |
|
|
2347 |
if (jvmti_thread_state() != NULL) {
|
|
2348 |
jvmti_thread_state()->oops_do(f);
|
|
2349 |
}
|
|
2350 |
}
|
|
2351 |
|
|
2352 |
void JavaThread::nmethods_do() {
|
|
2353 |
// Traverse the GCHandles
|
|
2354 |
Thread::nmethods_do();
|
|
2355 |
|
|
2356 |
assert( (!has_last_Java_frame() && java_call_counter() == 0) ||
|
|
2357 |
(has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!");
|
|
2358 |
|
|
2359 |
if (has_last_Java_frame()) {
|
|
2360 |
// Traverse the execution stack
|
|
2361 |
for(StackFrameStream fst(this); !fst.is_done(); fst.next()) {
|
|
2362 |
fst.current()->nmethods_do();
|
|
2363 |
}
|
|
2364 |
}
|
|
2365 |
}
|
|
2366 |
|
|
2367 |
// Printing
|
|
2368 |
const char* _get_thread_state_name(JavaThreadState _thread_state) {
|
|
2369 |
switch (_thread_state) {
|
|
2370 |
case _thread_uninitialized: return "_thread_uninitialized";
|
|
2371 |
case _thread_new: return "_thread_new";
|
|
2372 |
case _thread_new_trans: return "_thread_new_trans";
|
|
2373 |
case _thread_in_native: return "_thread_in_native";
|
|
2374 |
case _thread_in_native_trans: return "_thread_in_native_trans";
|
|
2375 |
case _thread_in_vm: return "_thread_in_vm";
|
|
2376 |
case _thread_in_vm_trans: return "_thread_in_vm_trans";
|
|
2377 |
case _thread_in_Java: return "_thread_in_Java";
|
|
2378 |
case _thread_in_Java_trans: return "_thread_in_Java_trans";
|
|
2379 |
case _thread_blocked: return "_thread_blocked";
|
|
2380 |
case _thread_blocked_trans: return "_thread_blocked_trans";
|
|
2381 |
default: return "unknown thread state";
|
|
2382 |
}
|
|
2383 |
}
|
|
2384 |
|
|
2385 |
#ifndef PRODUCT
|
|
2386 |
void JavaThread::print_thread_state_on(outputStream *st) const {
|
|
2387 |
st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state));
|
|
2388 |
};
|
|
2389 |
void JavaThread::print_thread_state() const {
|
|
2390 |
print_thread_state_on(tty);
|
|
2391 |
};
|
|
2392 |
#endif // PRODUCT
|
|
2393 |
|
|
2394 |
// Called by Threads::print() for VM_PrintThreads operation
|
|
2395 |
void JavaThread::print_on(outputStream *st) const {
|
|
2396 |
st->print("\"%s\" ", get_thread_name());
|
|
2397 |
oop thread_oop = threadObj();
|
|
2398 |
if (thread_oop != NULL && java_lang_Thread::is_daemon(thread_oop)) st->print("daemon ");
|
|
2399 |
Thread::print_on(st);
|
|
2400 |
// print guess for valid stack memory region (assume 4K pages); helps lock debugging
|
|
2401 |
st->print_cr("[" INTPTR_FORMAT ".." INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12), highest_lock());
|
|
2402 |
if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) {
|
|
2403 |
st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop));
|
|
2404 |
}
|
|
2405 |
#ifndef PRODUCT
|
|
2406 |
print_thread_state_on(st);
|
|
2407 |
_safepoint_state->print_on(st);
|
|
2408 |
#endif // PRODUCT
|
|
2409 |
}
|
|
2410 |
|
|
2411 |
// Called by fatal error handler. The difference between this and
|
|
2412 |
// JavaThread::print() is that we can't grab lock or allocate memory.
|
|
2413 |
void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const {
|
|
2414 |
st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen));
|
|
2415 |
oop thread_obj = threadObj();
|
|
2416 |
if (thread_obj != NULL) {
|
|
2417 |
if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon");
|
|
2418 |
}
|
|
2419 |
st->print(" [");
|
|
2420 |
st->print("%s", _get_thread_state_name(_thread_state));
|
|
2421 |
if (osthread()) {
|
|
2422 |
st->print(", id=%d", osthread()->thread_id());
|
|
2423 |
}
|
|
2424 |
st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")",
|
|
2425 |
_stack_base - _stack_size, _stack_base);
|
|
2426 |
st->print("]");
|
|
2427 |
return;
|
|
2428 |
}
|
|
2429 |
|
|
2430 |
// Verification
|
|
2431 |
|
|
2432 |
static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); }
|
|
2433 |
|
|
2434 |
void JavaThread::verify() {
|
|
2435 |
// Verify oops in the thread.
|
|
2436 |
oops_do(&VerifyOopClosure::verify_oop);
|
|
2437 |
|
|
2438 |
// Verify the stack frames.
|
|
2439 |
frames_do(frame_verify);
|
|
2440 |
}
|
|
2441 |
|
|
2442 |
// CR 6300358 (sub-CR 2137150)
|
|
2443 |
// Most callers of this method assume that it can't return NULL but a
|
|
2444 |
// thread may not have a name whilst it is in the process of attaching to
|
|
2445 |
// the VM - see CR 6412693, and there are places where a JavaThread can be
|
|
2446 |
// seen prior to having it's threadObj set (eg JNI attaching threads and
|
|
2447 |
// if vm exit occurs during initialization). These cases can all be accounted
|
|
2448 |
// for such that this method never returns NULL.
|
|
2449 |
const char* JavaThread::get_thread_name() const {
|
|
2450 |
#ifdef ASSERT
|
|
2451 |
// early safepoints can hit while current thread does not yet have TLS
|
|
2452 |
if (!SafepointSynchronize::is_at_safepoint()) {
|
|
2453 |
Thread *cur = Thread::current();
|
|
2454 |
if (!(cur->is_Java_thread() && cur == this)) {
|
|
2455 |
// Current JavaThreads are allowed to get their own name without
|
|
2456 |
// the Threads_lock.
|
|
2457 |
assert_locked_or_safepoint(Threads_lock);
|
|
2458 |
}
|
|
2459 |
}
|
|
2460 |
#endif // ASSERT
|
|
2461 |
return get_thread_name_string();
|
|
2462 |
}
|
|
2463 |
|
|
2464 |
// Returns a non-NULL representation of this thread's name, or a suitable
|
|
2465 |
// descriptive string if there is no set name
|
|
2466 |
const char* JavaThread::get_thread_name_string(char* buf, int buflen) const {
|
|
2467 |
const char* name_str;
|
|
2468 |
oop thread_obj = threadObj();
|
|
2469 |
if (thread_obj != NULL) {
|
|
2470 |
typeArrayOop name = java_lang_Thread::name(thread_obj);
|
|
2471 |
if (name != NULL) {
|
|
2472 |
if (buf == NULL) {
|
|
2473 |
name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length());
|
|
2474 |
}
|
|
2475 |
else {
|
|
2476 |
name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen);
|
|
2477 |
}
|
|
2478 |
}
|
|
2479 |
else if (is_attaching()) { // workaround for 6412693 - see 6404306
|
|
2480 |
name_str = "<no-name - thread is attaching>";
|
|
2481 |
}
|
|
2482 |
else {
|
|
2483 |
name_str = Thread::name();
|
|
2484 |
}
|
|
2485 |
}
|
|
2486 |
else {
|
|
2487 |
name_str = Thread::name();
|
|
2488 |
}
|
|
2489 |
assert(name_str != NULL, "unexpected NULL thread name");
|
|
2490 |
return name_str;
|
|
2491 |
}
|
|
2492 |
|
|
2493 |
|
|
2494 |
const char* JavaThread::get_threadgroup_name() const {
|
|
2495 |
debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);)
|
|
2496 |
oop thread_obj = threadObj();
|
|
2497 |
if (thread_obj != NULL) {
|
|
2498 |
oop thread_group = java_lang_Thread::threadGroup(thread_obj);
|
|
2499 |
if (thread_group != NULL) {
|
|
2500 |
typeArrayOop name = java_lang_ThreadGroup::name(thread_group);
|
|
2501 |
// ThreadGroup.name can be null
|
|
2502 |
if (name != NULL) {
|
|
2503 |
const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length());
|
|
2504 |
return str;
|
|
2505 |
}
|
|
2506 |
}
|
|
2507 |
}
|
|
2508 |
return NULL;
|
|
2509 |
}
|
|
2510 |
|
|
2511 |
const char* JavaThread::get_parent_name() const {
|
|
2512 |
debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);)
|
|
2513 |
oop thread_obj = threadObj();
|
|
2514 |
if (thread_obj != NULL) {
|
|
2515 |
oop thread_group = java_lang_Thread::threadGroup(thread_obj);
|
|
2516 |
if (thread_group != NULL) {
|
|
2517 |
oop parent = java_lang_ThreadGroup::parent(thread_group);
|
|
2518 |
if (parent != NULL) {
|
|
2519 |
typeArrayOop name = java_lang_ThreadGroup::name(parent);
|
|
2520 |
// ThreadGroup.name can be null
|
|
2521 |
if (name != NULL) {
|
|
2522 |
const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length());
|
|
2523 |
return str;
|
|
2524 |
}
|
|
2525 |
}
|
|
2526 |
}
|
|
2527 |
}
|
|
2528 |
return NULL;
|
|
2529 |
}
|
|
2530 |
|
|
2531 |
ThreadPriority JavaThread::java_priority() const {
|
|
2532 |
oop thr_oop = threadObj();
|
|
2533 |
if (thr_oop == NULL) return NormPriority; // Bootstrapping
|
|
2534 |
ThreadPriority priority = java_lang_Thread::priority(thr_oop);
|
|
2535 |
assert(MinPriority <= priority && priority <= MaxPriority, "sanity check");
|
|
2536 |
return priority;
|
|
2537 |
}
|
|
2538 |
|
|
2539 |
void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) {
|
|
2540 |
|
|
2541 |
assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
|
|
2542 |
// Link Java Thread object <-> C++ Thread
|
|
2543 |
|
|
2544 |
// Get the C++ thread object (an oop) from the JNI handle (a jthread)
|
|
2545 |
// and put it into a new Handle. The Handle "thread_oop" can then
|
|
2546 |
// be used to pass the C++ thread object to other methods.
|
|
2547 |
|
|
2548 |
// Set the Java level thread object (jthread) field of the
|
|
2549 |
// new thread (a JavaThread *) to C++ thread object using the
|
|
2550 |
// "thread_oop" handle.
|
|
2551 |
|
|
2552 |
// Set the thread field (a JavaThread *) of the
|
|
2553 |
// oop representing the java_lang_Thread to the new thread (a JavaThread *).
|
|
2554 |
|
|
2555 |
Handle thread_oop(Thread::current(),
|
|
2556 |
JNIHandles::resolve_non_null(jni_thread));
|
|
2557 |
assert(instanceKlass::cast(thread_oop->klass())->is_linked(),
|
|
2558 |
"must be initialized");
|
|
2559 |
set_threadObj(thread_oop());
|
|
2560 |
java_lang_Thread::set_thread(thread_oop(), this);
|
|
2561 |
|
|
2562 |
if (prio == NoPriority) {
|
|
2563 |
prio = java_lang_Thread::priority(thread_oop());
|
|
2564 |
assert(prio != NoPriority, "A valid priority should be present");
|
|
2565 |
}
|
|
2566 |
|
|
2567 |
// Push the Java priority down to the native thread; needs Threads_lock
|
|
2568 |
Thread::set_priority(this, prio);
|
|
2569 |
|
|
2570 |
// Add the new thread to the Threads list and set it in motion.
|
|
2571 |
// We must have threads lock in order to call Threads::add.
|
|
2572 |
// It is crucial that we do not block before the thread is
|
|
2573 |
// added to the Threads list for if a GC happens, then the java_thread oop
|
|
2574 |
// will not be visited by GC.
|
|
2575 |
Threads::add(this);
|
|
2576 |
}
|
|
2577 |
|
|
2578 |
oop JavaThread::current_park_blocker() {
|
|
2579 |
// Support for JSR-166 locks
|
|
2580 |
oop thread_oop = threadObj();
|
|
2581 |
if (thread_oop != NULL && JDK_Version::supports_thread_park_blocker()) {
|
|
2582 |
return java_lang_Thread::park_blocker(thread_oop);
|
|
2583 |
}
|
|
2584 |
return NULL;
|
|
2585 |
}
|
|
2586 |
|
|
2587 |
|
|
2588 |
void JavaThread::print_stack_on(outputStream* st) {
|
|
2589 |
if (!has_last_Java_frame()) return;
|
|
2590 |
ResourceMark rm;
|
|
2591 |
HandleMark hm;
|
|
2592 |
|
|
2593 |
RegisterMap reg_map(this);
|
|
2594 |
vframe* start_vf = last_java_vframe(®_map);
|
|
2595 |
int count = 0;
|
|
2596 |
for (vframe* f = start_vf; f; f = f->sender() ) {
|
|
2597 |
if (f->is_java_frame()) {
|
|
2598 |
javaVFrame* jvf = javaVFrame::cast(f);
|
|
2599 |
java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci());
|
|
2600 |
|
|
2601 |
// Print out lock information
|
|
2602 |
if (JavaMonitorsInStackTrace) {
|
|
2603 |
jvf->print_lock_info_on(st, count);
|
|
2604 |
}
|
|
2605 |
} else {
|
|
2606 |
// Ignore non-Java frames
|
|
2607 |
}
|
|
2608 |
|
|
2609 |
// Bail-out case for too deep stacks
|
|
2610 |
count++;
|
|
2611 |
if (MaxJavaStackTraceDepth == count) return;
|
|
2612 |
}
|
|
2613 |
}
|
|
2614 |
|
|
2615 |
|
|
2616 |
// JVMTI PopFrame support
|
|
2617 |
void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) {
|
|
2618 |
assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments");
|
|
2619 |
if (in_bytes(size_in_bytes) != 0) {
|
|
2620 |
_popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes));
|
|
2621 |
_popframe_preserved_args_size = in_bytes(size_in_bytes);
|
|
2622 |
Copy::conjoint_bytes(start, _popframe_preserved_args, _popframe_preserved_args_size);
|
|
2623 |
}
|
|
2624 |
}
|
|
2625 |
|
|
2626 |
void* JavaThread::popframe_preserved_args() {
|
|
2627 |
return _popframe_preserved_args;
|
|
2628 |
}
|
|
2629 |
|
|
2630 |
ByteSize JavaThread::popframe_preserved_args_size() {
|
|
2631 |
return in_ByteSize(_popframe_preserved_args_size);
|
|
2632 |
}
|
|
2633 |
|
|
2634 |
WordSize JavaThread::popframe_preserved_args_size_in_words() {
|
|
2635 |
int sz = in_bytes(popframe_preserved_args_size());
|
|
2636 |
assert(sz % wordSize == 0, "argument size must be multiple of wordSize");
|
|
2637 |
return in_WordSize(sz / wordSize);
|
|
2638 |
}
|
|
2639 |
|
|
2640 |
void JavaThread::popframe_free_preserved_args() {
|
|
2641 |
assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice");
|
|
2642 |
FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args);
|
|
2643 |
_popframe_preserved_args = NULL;
|
|
2644 |
_popframe_preserved_args_size = 0;
|
|
2645 |
}
|
|
2646 |
|
|
2647 |
#ifndef PRODUCT
|
|
2648 |
|
|
2649 |
void JavaThread::trace_frames() {
|
|
2650 |
tty->print_cr("[Describe stack]");
|
|
2651 |
int frame_no = 1;
|
|
2652 |
for(StackFrameStream fst(this); !fst.is_done(); fst.next()) {
|
|
2653 |
tty->print(" %d. ", frame_no++);
|
|
2654 |
fst.current()->print_value_on(tty,this);
|
|
2655 |
tty->cr();
|
|
2656 |
}
|
|
2657 |
}
|
|
2658 |
|
|
2659 |
|
|
2660 |
void JavaThread::trace_stack_from(vframe* start_vf) {
|
|
2661 |
ResourceMark rm;
|
|
2662 |
int vframe_no = 1;
|
|
2663 |
for (vframe* f = start_vf; f; f = f->sender() ) {
|
|
2664 |
if (f->is_java_frame()) {
|
|
2665 |
javaVFrame::cast(f)->print_activation(vframe_no++);
|
|
2666 |
} else {
|
|
2667 |
f->print();
|
|
2668 |
}
|
|
2669 |
if (vframe_no > StackPrintLimit) {
|
|
2670 |
tty->print_cr("...<more frames>...");
|
|
2671 |
return;
|
|
2672 |
}
|
|
2673 |
}
|
|
2674 |
}
|
|
2675 |
|
|
2676 |
|
|
2677 |
void JavaThread::trace_stack() {
|
|
2678 |
if (!has_last_Java_frame()) return;
|
|
2679 |
ResourceMark rm;
|
|
2680 |
HandleMark hm;
|
|
2681 |
RegisterMap reg_map(this);
|
|
2682 |
trace_stack_from(last_java_vframe(®_map));
|
|
2683 |
}
|
|
2684 |
|
|
2685 |
|
|
2686 |
#endif // PRODUCT
|
|
2687 |
|
|
2688 |
|
|
2689 |
javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) {
|
|
2690 |
assert(reg_map != NULL, "a map must be given");
|
|
2691 |
frame f = last_frame();
|
|
2692 |
for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) {
|
|
2693 |
if (vf->is_java_frame()) return javaVFrame::cast(vf);
|
|
2694 |
}
|
|
2695 |
return NULL;
|
|
2696 |
}
|
|
2697 |
|
|
2698 |
|
|
2699 |
klassOop JavaThread::security_get_caller_class(int depth) {
|
|
2700 |
vframeStream vfst(this);
|
|
2701 |
vfst.security_get_caller_frame(depth);
|
|
2702 |
if (!vfst.at_end()) {
|
|
2703 |
return vfst.method()->method_holder();
|
|
2704 |
}
|
|
2705 |
return NULL;
|
|
2706 |
}
|
|
2707 |
|
|
2708 |
static void compiler_thread_entry(JavaThread* thread, TRAPS) {
|
|
2709 |
assert(thread->is_Compiler_thread(), "must be compiler thread");
|
|
2710 |
CompileBroker::compiler_thread_loop();
|
|
2711 |
}
|
|
2712 |
|
|
2713 |
// Create a CompilerThread
|
|
2714 |
CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters)
|
|
2715 |
: JavaThread(&compiler_thread_entry) {
|
|
2716 |
_env = NULL;
|
|
2717 |
_log = NULL;
|
|
2718 |
_task = NULL;
|
|
2719 |
_queue = queue;
|
|
2720 |
_counters = counters;
|
|
2721 |
|
|
2722 |
#ifndef PRODUCT
|
|
2723 |
_ideal_graph_printer = NULL;
|
|
2724 |
#endif
|
|
2725 |
}
|
|
2726 |
|
|
2727 |
|
|
2728 |
// ======= Threads ========
|
|
2729 |
|
|
2730 |
// The Threads class links together all active threads, and provides
|
|
2731 |
// operations over all threads. It is protected by its own Mutex
|
|
2732 |
// lock, which is also used in other contexts to protect thread
|
|
2733 |
// operations from having the thread being operated on from exiting
|
|
2734 |
// and going away unexpectedly (e.g., safepoint synchronization)
|
|
2735 |
|
|
2736 |
JavaThread* Threads::_thread_list = NULL;
|
|
2737 |
int Threads::_number_of_threads = 0;
|
|
2738 |
int Threads::_number_of_non_daemon_threads = 0;
|
|
2739 |
int Threads::_return_code = 0;
|
|
2740 |
size_t JavaThread::_stack_size_at_create = 0;
|
|
2741 |
|
|
2742 |
// All JavaThreads
|
|
2743 |
#define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next())
|
|
2744 |
|
|
2745 |
void os_stream();
|
|
2746 |
|
|
2747 |
// All JavaThreads + all non-JavaThreads (i.e., every thread in the system)
|
|
2748 |
void Threads::threads_do(ThreadClosure* tc) {
|
|
2749 |
assert_locked_or_safepoint(Threads_lock);
|
|
2750 |
// ALL_JAVA_THREADS iterates through all JavaThreads
|
|
2751 |
ALL_JAVA_THREADS(p) {
|
|
2752 |
tc->do_thread(p);
|
|
2753 |
}
|
|
2754 |
// Someday we could have a table or list of all non-JavaThreads.
|
|
2755 |
// For now, just manually iterate through them.
|
|
2756 |
tc->do_thread(VMThread::vm_thread());
|
|
2757 |
Universe::heap()->gc_threads_do(tc);
|
|
2758 |
tc->do_thread(WatcherThread::watcher_thread());
|
|
2759 |
// If CompilerThreads ever become non-JavaThreads, add them here
|
|
2760 |
}
|
|
2761 |
|
|
2762 |
jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) {
|
|
2763 |
|
|
2764 |
// Check version
|
|
2765 |
if (!is_supported_jni_version(args->version)) return JNI_EVERSION;
|
|
2766 |
|
|
2767 |
// Initialize the output stream module
|
|
2768 |
ostream_init();
|
|
2769 |
|
|
2770 |
// Process java launcher properties.
|
|
2771 |
Arguments::process_sun_java_launcher_properties(args);
|
|
2772 |
|
|
2773 |
// Initialize the os module before using TLS
|
|
2774 |
os::init();
|
|
2775 |
|
|
2776 |
// Initialize system properties.
|
|
2777 |
Arguments::init_system_properties();
|
|
2778 |
|
|
2779 |
// Parse arguments
|
|
2780 |
jint parse_result = Arguments::parse(args);
|
|
2781 |
if (parse_result != JNI_OK) return parse_result;
|
|
2782 |
|
|
2783 |
if (PauseAtStartup) {
|
|
2784 |
os::pause();
|
|
2785 |
}
|
|
2786 |
|
|
2787 |
HS_DTRACE_PROBE(hotspot, vm__init__begin);
|
|
2788 |
|
|
2789 |
// Record VM creation timing statistics
|
|
2790 |
TraceVmCreationTime create_vm_timer;
|
|
2791 |
create_vm_timer.start();
|
|
2792 |
|
|
2793 |
// Timing (must come after argument parsing)
|
|
2794 |
TraceTime timer("Create VM", TraceStartupTime);
|
|
2795 |
|
|
2796 |
// Initialize the os module after parsing the args
|
|
2797 |
jint os_init_2_result = os::init_2();
|
|
2798 |
if (os_init_2_result != JNI_OK) return os_init_2_result;
|
|
2799 |
|
|
2800 |
// Initialize output stream logging
|
|
2801 |
ostream_init_log();
|
|
2802 |
|
|
2803 |
// Convert -Xrun to -agentlib: if there is no JVM_OnLoad
|
|
2804 |
// Must be before create_vm_init_agents()
|
|
2805 |
if (Arguments::init_libraries_at_startup()) {
|
|
2806 |
convert_vm_init_libraries_to_agents();
|
|
2807 |
}
|
|
2808 |
|
|
2809 |
// Launch -agentlib/-agentpath and converted -Xrun agents
|
|
2810 |
if (Arguments::init_agents_at_startup()) {
|
|
2811 |
create_vm_init_agents();
|
|
2812 |
}
|
|
2813 |
|
|
2814 |
// Initialize Threads state
|
|
2815 |
_thread_list = NULL;
|
|
2816 |
_number_of_threads = 0;
|
|
2817 |
_number_of_non_daemon_threads = 0;
|
|
2818 |
|
|
2819 |
// Initialize TLS
|
|
2820 |
ThreadLocalStorage::init();
|
|
2821 |
|
|
2822 |
// Initialize global data structures and create system classes in heap
|
|
2823 |
vm_init_globals();
|
|
2824 |
|
|
2825 |
// Attach the main thread to this os thread
|
|
2826 |
JavaThread* main_thread = new JavaThread();
|
|
2827 |
main_thread->set_thread_state(_thread_in_vm);
|
|
2828 |
// must do this before set_active_handles and initialize_thread_local_storage
|
|
2829 |
// Note: on solaris initialize_thread_local_storage() will (indirectly)
|
|
2830 |
// change the stack size recorded here to one based on the java thread
|
|
2831 |
// stacksize. This adjusted size is what is used to figure the placement
|
|
2832 |
// of the guard pages.
|
|
2833 |
main_thread->record_stack_base_and_size();
|
|
2834 |
main_thread->initialize_thread_local_storage();
|
|
2835 |
|
|
2836 |
main_thread->set_active_handles(JNIHandleBlock::allocate_block());
|
|
2837 |
|
|
2838 |
if (!main_thread->set_as_starting_thread()) {
|
|
2839 |
vm_shutdown_during_initialization(
|
|
2840 |
"Failed necessary internal allocation. Out of swap space");
|
|
2841 |
delete main_thread;
|
|
2842 |
*canTryAgain = false; // don't let caller call JNI_CreateJavaVM again
|
|
2843 |
return JNI_ENOMEM;
|
|
2844 |
}
|
|
2845 |
|
|
2846 |
// Enable guard page *after* os::create_main_thread(), otherwise it would
|
|
2847 |
// crash Linux VM, see notes in os_linux.cpp.
|
|
2848 |
main_thread->create_stack_guard_pages();
|
|
2849 |
|
|
2850 |
// Initialize Java-Leve synchronization subsystem
|
|
2851 |
ObjectSynchronizer::Initialize() ;
|
|
2852 |
|
|
2853 |
// Initialize global modules
|
|
2854 |
jint status = init_globals();
|
|
2855 |
if (status != JNI_OK) {
|
|
2856 |
delete main_thread;
|
|
2857 |
*canTryAgain = false; // don't let caller call JNI_CreateJavaVM again
|
|
2858 |
return status;
|
|
2859 |
}
|
|
2860 |
|
|
2861 |
HandleMark hm;
|
|
2862 |
|
|
2863 |
{ MutexLocker mu(Threads_lock);
|
|
2864 |
Threads::add(main_thread);
|
|
2865 |
}
|
|
2866 |
|
|
2867 |
// Any JVMTI raw monitors entered in onload will transition into
|
|
2868 |
// real raw monitor. VM is setup enough here for raw monitor enter.
|
|
2869 |
JvmtiExport::transition_pending_onload_raw_monitors();
|
|
2870 |
|
|
2871 |
if (VerifyBeforeGC &&
|
|
2872 |
Universe::heap()->total_collections() >= VerifyGCStartAt) {
|
|
2873 |
Universe::heap()->prepare_for_verify();
|
|
2874 |
Universe::verify(); // make sure we're starting with a clean slate
|
|
2875 |
}
|
|
2876 |
|
|
2877 |
// Create the VMThread
|
|
2878 |
{ TraceTime timer("Start VMThread", TraceStartupTime);
|
|
2879 |
VMThread::create();
|
|
2880 |
Thread* vmthread = VMThread::vm_thread();
|
|
2881 |
|
|
2882 |
if (!os::create_thread(vmthread, os::vm_thread))
|
|
2883 |
vm_exit_during_initialization("Cannot create VM thread. Out of system resources.");
|
|
2884 |
|
|
2885 |
// Wait for the VM thread to become ready, and VMThread::run to initialize
|
|
2886 |
// Monitors can have spurious returns, must always check another state flag
|
|
2887 |
{
|
|
2888 |
MutexLocker ml(Notify_lock);
|
|
2889 |
os::start_thread(vmthread);
|
|
2890 |
while (vmthread->active_handles() == NULL) {
|
|
2891 |
Notify_lock->wait();
|
|
2892 |
}
|
|
2893 |
}
|
|
2894 |
}
|
|
2895 |
|
|
2896 |
assert (Universe::is_fully_initialized(), "not initialized");
|
|
2897 |
EXCEPTION_MARK;
|
|
2898 |
|
|
2899 |
// At this point, the Universe is initialized, but we have not executed
|
|
2900 |
// any byte code. Now is a good time (the only time) to dump out the
|
|
2901 |
// internal state of the JVM for sharing.
|
|
2902 |
|
|
2903 |
if (DumpSharedSpaces) {
|
|
2904 |
Universe::heap()->preload_and_dump(CHECK_0);
|
|
2905 |
ShouldNotReachHere();
|
|
2906 |
}
|
|
2907 |
|
|
2908 |
// Always call even when there are not JVMTI environments yet, since environments
|
|
2909 |
// may be attached late and JVMTI must track phases of VM execution
|
|
2910 |
JvmtiExport::enter_start_phase();
|
|
2911 |
|
|
2912 |
// Notify JVMTI agents that VM has started (JNI is up) - nop if no agents.
|
|
2913 |
JvmtiExport::post_vm_start();
|
|
2914 |
|
|
2915 |
{
|
|
2916 |
TraceTime timer("Initialize java.lang classes", TraceStartupTime);
|
|
2917 |
|
|
2918 |
if (EagerXrunInit && Arguments::init_libraries_at_startup()) {
|
|
2919 |
create_vm_init_libraries();
|
|
2920 |
}
|
|
2921 |
|
|
2922 |
if (InitializeJavaLangString) {
|
|
2923 |
initialize_class(vmSymbolHandles::java_lang_String(), CHECK_0);
|
|
2924 |
} else {
|
|
2925 |
warning("java.lang.String not initialized");
|
|
2926 |
}
|
|
2927 |
|
|
2928 |
// Initialize java_lang.System (needed before creating the thread)
|
|
2929 |
if (InitializeJavaLangSystem) {
|
|
2930 |
initialize_class(vmSymbolHandles::java_lang_System(), CHECK_0);
|
|
2931 |
initialize_class(vmSymbolHandles::java_lang_ThreadGroup(), CHECK_0);
|
|
2932 |
Handle thread_group = create_initial_thread_group(CHECK_0);
|
|
2933 |
Universe::set_main_thread_group(thread_group());
|
|
2934 |
initialize_class(vmSymbolHandles::java_lang_Thread(), CHECK_0);
|
|
2935 |
oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0);
|
|
2936 |
main_thread->set_threadObj(thread_object);
|
|
2937 |
// Set thread status to running since main thread has
|
|
2938 |
// been started and running.
|
|
2939 |
java_lang_Thread::set_thread_status(thread_object,
|
|
2940 |
java_lang_Thread::RUNNABLE);
|
|
2941 |
|
|
2942 |
// The VM preresolve methods to these classes. Make sure that get initialized
|
|
2943 |
initialize_class(vmSymbolHandles::java_lang_reflect_Method(), CHECK_0);
|
|
2944 |
initialize_class(vmSymbolHandles::java_lang_ref_Finalizer(), CHECK_0);
|
|
2945 |
// The VM creates & returns objects of this class. Make sure it's initialized.
|
|
2946 |
initialize_class(vmSymbolHandles::java_lang_Class(), CHECK_0);
|
|
2947 |
call_initializeSystemClass(CHECK_0);
|
|
2948 |
} else {
|
|
2949 |
warning("java.lang.System not initialized");
|
|
2950 |
}
|
|
2951 |
|
|
2952 |
// an instance of OutOfMemory exception has been allocated earlier
|
|
2953 |
if (InitializeJavaLangExceptionsErrors) {
|
|
2954 |
initialize_class(vmSymbolHandles::java_lang_OutOfMemoryError(), CHECK_0);
|
|
2955 |
initialize_class(vmSymbolHandles::java_lang_NullPointerException(), CHECK_0);
|
|
2956 |
initialize_class(vmSymbolHandles::java_lang_ClassCastException(), CHECK_0);
|
|
2957 |
initialize_class(vmSymbolHandles::java_lang_ArrayStoreException(), CHECK_0);
|
|
2958 |
initialize_class(vmSymbolHandles::java_lang_ArithmeticException(), CHECK_0);
|
|
2959 |
initialize_class(vmSymbolHandles::java_lang_StackOverflowError(), CHECK_0);
|
|
2960 |
initialize_class(vmSymbolHandles::java_lang_IllegalMonitorStateException(), CHECK_0);
|
|
2961 |
} else {
|
|
2962 |
warning("java.lang.OutOfMemoryError has not been initialized");
|
|
2963 |
warning("java.lang.NullPointerException has not been initialized");
|
|
2964 |
warning("java.lang.ClassCastException has not been initialized");
|
|
2965 |
warning("java.lang.ArrayStoreException has not been initialized");
|
|
2966 |
warning("java.lang.ArithmeticException has not been initialized");
|
|
2967 |
warning("java.lang.StackOverflowError has not been initialized");
|
|
2968 |
}
|
|
2969 |
}
|
|
2970 |
|
|
2971 |
// See : bugid 4211085.
|
|
2972 |
// Background : the static initializer of java.lang.Compiler tries to read
|
|
2973 |
// property"java.compiler" and read & write property "java.vm.info".
|
|
2974 |
// When a security manager is installed through the command line
|
|
2975 |
// option "-Djava.security.manager", the above properties are not
|
|
2976 |
// readable and the static initializer for java.lang.Compiler fails
|
|
2977 |
// resulting in a NoClassDefFoundError. This can happen in any
|
|
2978 |
// user code which calls methods in java.lang.Compiler.
|
|
2979 |
// Hack : the hack is to pre-load and initialize this class, so that only
|
|
2980 |
// system domains are on the stack when the properties are read.
|
|
2981 |
// Currently even the AWT code has calls to methods in java.lang.Compiler.
|
|
2982 |
// On the classic VM, java.lang.Compiler is loaded very early to load the JIT.
|
|
2983 |
// Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and
|
|
2984 |
// read and write"java.vm.info" in the default policy file. See bugid 4211383
|
|
2985 |
// Once that is done, we should remove this hack.
|
|
2986 |
initialize_class(vmSymbolHandles::java_lang_Compiler(), CHECK_0);
|
|
2987 |
|
|
2988 |
// More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to
|
|
2989 |
// the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot
|
|
2990 |
// compiler does not get loaded through java.lang.Compiler). "java -version" with the
|
|
2991 |
// hotspot vm says "nojit" all the time which is confusing. So, we reset it here.
|
|
2992 |
// This should also be taken out as soon as 4211383 gets fixed.
|
|
2993 |
reset_vm_info_property(CHECK_0);
|
|
2994 |
|
|
2995 |
quicken_jni_functions();
|
|
2996 |
|
|
2997 |
// Set flag that basic initialization has completed. Used by exceptions and various
|
|
2998 |
// debug stuff, that does not work until all basic classes have been initialized.
|
|
2999 |
set_init_completed();
|
|
3000 |
|
|
3001 |
HS_DTRACE_PROBE(hotspot, vm__init__end);
|
|
3002 |
|
|
3003 |
// record VM initialization completion time
|
|
3004 |
Management::record_vm_init_completed();
|
|
3005 |
|
|
3006 |
// Compute system loader. Note that this has to occur after set_init_completed, since
|
|
3007 |
// valid exceptions may be thrown in the process.
|
|
3008 |
// Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and
|
|
3009 |
// set_init_completed has just been called, causing exceptions not to be shortcut
|
|
3010 |
// anymore. We call vm_exit_during_initialization directly instead.
|
|
3011 |
SystemDictionary::compute_java_system_loader(THREAD);
|
|
3012 |
if (HAS_PENDING_EXCEPTION) {
|
|
3013 |
vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION));
|
|
3014 |
}
|
|
3015 |
|
|
3016 |
#ifndef SERIALGC
|
|
3017 |
// Support for ConcurrentMarkSweep. This should be cleaned up
|
|
3018 |
// and better encapsulated. XXX YSR
|
|
3019 |
if (UseConcMarkSweepGC) {
|
|
3020 |
ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD);
|
|
3021 |
if (HAS_PENDING_EXCEPTION) {
|
|
3022 |
vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION));
|
|
3023 |
}
|
|
3024 |
}
|
|
3025 |
#endif // SERIALGC
|
|
3026 |
|
|
3027 |
// Always call even when there are not JVMTI environments yet, since environments
|
|
3028 |
// may be attached late and JVMTI must track phases of VM execution
|
|
3029 |
JvmtiExport::enter_live_phase();
|
|
3030 |
|
|
3031 |
// Signal Dispatcher needs to be started before VMInit event is posted
|
|
3032 |
os::signal_init();
|
|
3033 |
|
|
3034 |
// Start Attach Listener if +StartAttachListener or it can't be started lazily
|
|
3035 |
if (!DisableAttachMechanism) {
|
|
3036 |
if (StartAttachListener || AttachListener::init_at_startup()) {
|
|
3037 |
AttachListener::init();
|
|
3038 |
}
|
|
3039 |
}
|
|
3040 |
|
|
3041 |
// Launch -Xrun agents
|
|
3042 |
// Must be done in the JVMTI live phase so that for backward compatibility the JDWP
|
|
3043 |
// back-end can launch with -Xdebug -Xrunjdwp.
|
|
3044 |
if (!EagerXrunInit && Arguments::init_libraries_at_startup()) {
|
|
3045 |
create_vm_init_libraries();
|
|
3046 |
}
|
|
3047 |
|
|
3048 |
// Notify JVMTI agents that VM initialization is complete - nop if no agents.
|
|
3049 |
JvmtiExport::post_vm_initialized();
|
|
3050 |
|
|
3051 |
Chunk::start_chunk_pool_cleaner_task();
|
|
3052 |
|
|
3053 |
// initialize compiler(s)
|
|
3054 |
CompileBroker::compilation_init();
|
|
3055 |
|
|
3056 |
Management::initialize(THREAD);
|
|
3057 |
if (HAS_PENDING_EXCEPTION) {
|
|
3058 |
// management agent fails to start possibly due to
|
|
3059 |
// configuration problem and is responsible for printing
|
|
3060 |
// stack trace if appropriate. Simply exit VM.
|
|
3061 |
vm_exit(1);
|
|
3062 |
}
|
|
3063 |
|
|
3064 |
if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true);
|
|
3065 |
if (Arguments::has_alloc_profile()) AllocationProfiler::engage();
|
|
3066 |
if (MemProfiling) MemProfiler::engage();
|
|
3067 |
StatSampler::engage();
|
|
3068 |
if (CheckJNICalls) JniPeriodicChecker::engage();
|
|
3069 |
if (CacheTimeMillis) TimeMillisUpdateTask::engage();
|
|
3070 |
|
|
3071 |
BiasedLocking::init();
|
|
3072 |
|
|
3073 |
|
|
3074 |
// Start up the WatcherThread if there are any periodic tasks
|
|
3075 |
// NOTE: All PeriodicTasks should be registered by now. If they
|
|
3076 |
// aren't, late joiners might appear to start slowly (we might
|
|
3077 |
// take a while to process their first tick).
|
|
3078 |
if (PeriodicTask::num_tasks() > 0) {
|
|
3079 |
WatcherThread::start();
|
|
3080 |
}
|
|
3081 |
|
|
3082 |
create_vm_timer.end();
|
|
3083 |
return JNI_OK;
|
|
3084 |
}
|
|
3085 |
|
|
3086 |
// type for the Agent_OnLoad and JVM_OnLoad entry points
|
|
3087 |
extern "C" {
|
|
3088 |
typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *);
|
|
3089 |
}
|
|
3090 |
// Find a command line agent library and return its entry point for
|
|
3091 |
// -agentlib: -agentpath: -Xrun
|
|
3092 |
// num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array.
|
|
3093 |
static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) {
|
|
3094 |
OnLoadEntry_t on_load_entry = NULL;
|
|
3095 |
void *library = agent->os_lib(); // check if we have looked it up before
|
|
3096 |
|
|
3097 |
if (library == NULL) {
|
|
3098 |
char buffer[JVM_MAXPATHLEN];
|
|
3099 |
char ebuf[1024];
|
|
3100 |
const char *name = agent->name();
|
|
3101 |
|
|
3102 |
if (agent->is_absolute_path()) {
|
|
3103 |
library = hpi::dll_load(name, ebuf, sizeof ebuf);
|
|
3104 |
if (library == NULL) {
|
|
3105 |
// If we can't find the agent, exit.
|
|
3106 |
vm_exit_during_initialization("Could not find agent library in absolute path", name);
|
|
3107 |
}
|
|
3108 |
} else {
|
|
3109 |
// Try to load the agent from the standard dll directory
|
|
3110 |
hpi::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), name);
|
|
3111 |
library = hpi::dll_load(buffer, ebuf, sizeof ebuf);
|
|
3112 |
#ifdef KERNEL
|
|
3113 |
// Download instrument dll
|
|
3114 |
if (library == NULL && strcmp(name, "instrument") == 0) {
|
|
3115 |
char *props = Arguments::get_kernel_properties();
|
|
3116 |
char *home = Arguments::get_java_home();
|
|
3117 |
const char *fmt = "%s/bin/java %s -Dkernel.background.download=false"
|
|
3118 |
" sun.jkernel.DownloadManager -download client_jvm";
|
|
3119 |
int length = strlen(props) + strlen(home) + strlen(fmt) + 1;
|
|
3120 |
char *cmd = AllocateHeap(length);
|
|
3121 |
jio_snprintf(cmd, length, fmt, home, props);
|
|
3122 |
int status = os::fork_and_exec(cmd);
|
|
3123 |
FreeHeap(props);
|
|
3124 |
FreeHeap(cmd);
|
|
3125 |
if (status == -1) {
|
|
3126 |
warning(cmd);
|
|
3127 |
vm_exit_during_initialization("fork_and_exec failed: %s",
|
|
3128 |
strerror(errno));
|
|
3129 |
}
|
|
3130 |
// when this comes back the instrument.dll should be where it belongs.
|
|
3131 |
library = hpi::dll_load(buffer, ebuf, sizeof ebuf);
|
|
3132 |
}
|
|
3133 |
#endif // KERNEL
|
|
3134 |
if (library == NULL) { // Try the local directory
|
|
3135 |
char ns[1] = {0};
|
|
3136 |
hpi::dll_build_name(buffer, sizeof(buffer), ns, name);
|
|
3137 |
library = hpi::dll_load(buffer, ebuf, sizeof ebuf);
|
|
3138 |
if (library == NULL) {
|
|
3139 |
// If we can't find the agent, exit.
|
|
3140 |
vm_exit_during_initialization("Could not find agent library on the library path or in the local directory", name);
|
|
3141 |
}
|
|
3142 |
}
|
|
3143 |
}
|
|
3144 |
agent->set_os_lib(library);
|
|
3145 |
}
|
|
3146 |
|
|
3147 |
// Find the OnLoad function.
|
|
3148 |
for (size_t symbol_index = 0; symbol_index < num_symbol_entries; symbol_index++) {
|
|
3149 |
on_load_entry = CAST_TO_FN_PTR(OnLoadEntry_t, hpi::dll_lookup(library, on_load_symbols[symbol_index]));
|
|
3150 |
if (on_load_entry != NULL) break;
|
|
3151 |
}
|
|
3152 |
return on_load_entry;
|
|
3153 |
}
|
|
3154 |
|
|
3155 |
// Find the JVM_OnLoad entry point
|
|
3156 |
static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) {
|
|
3157 |
const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS;
|
|
3158 |
return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*));
|
|
3159 |
}
|
|
3160 |
|
|
3161 |
// Find the Agent_OnLoad entry point
|
|
3162 |
static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) {
|
|
3163 |
const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS;
|
|
3164 |
return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*));
|
|
3165 |
}
|
|
3166 |
|
|
3167 |
// For backwards compatibility with -Xrun
|
|
3168 |
// Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be
|
|
3169 |
// treated like -agentpath:
|
|
3170 |
// Must be called before agent libraries are created
|
|
3171 |
void Threads::convert_vm_init_libraries_to_agents() {
|
|
3172 |
AgentLibrary* agent;
|
|
3173 |
AgentLibrary* next;
|
|
3174 |
|
|
3175 |
for (agent = Arguments::libraries(); agent != NULL; agent = next) {
|
|
3176 |
next = agent->next(); // cache the next agent now as this agent may get moved off this list
|
|
3177 |
OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent);
|
|
3178 |
|
|
3179 |
// If there is an JVM_OnLoad function it will get called later,
|
|
3180 |
// otherwise see if there is an Agent_OnLoad
|
|
3181 |
if (on_load_entry == NULL) {
|
|
3182 |
on_load_entry = lookup_agent_on_load(agent);
|
|
3183 |
if (on_load_entry != NULL) {
|
|
3184 |
// switch it to the agent list -- so that Agent_OnLoad will be called,
|
|
3185 |
// JVM_OnLoad won't be attempted and Agent_OnUnload will
|
|
3186 |
Arguments::convert_library_to_agent(agent);
|
|
3187 |
} else {
|
|
3188 |
vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name());
|
|
3189 |
}
|
|
3190 |
}
|
|
3191 |
}
|
|
3192 |
}
|
|
3193 |
|
|
3194 |
// Create agents for -agentlib: -agentpath: and converted -Xrun
|
|
3195 |
// Invokes Agent_OnLoad
|
|
3196 |
// Called very early -- before JavaThreads exist
|
|
3197 |
void Threads::create_vm_init_agents() {
|
|
3198 |
extern struct JavaVM_ main_vm;
|
|
3199 |
AgentLibrary* agent;
|
|
3200 |
|
|
3201 |
JvmtiExport::enter_onload_phase();
|
|
3202 |
for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) {
|
|
3203 |
OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent);
|
|
3204 |
|
|
3205 |
if (on_load_entry != NULL) {
|
|
3206 |
// Invoke the Agent_OnLoad function
|
|
3207 |
jint err = (*on_load_entry)(&main_vm, agent->options(), NULL);
|
|
3208 |
if (err != JNI_OK) {
|
|
3209 |
vm_exit_during_initialization("agent library failed to init", agent->name());
|
|
3210 |
}
|
|
3211 |
} else {
|
|
3212 |
vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name());
|
|
3213 |
}
|
|
3214 |
}
|
|
3215 |
JvmtiExport::enter_primordial_phase();
|
|
3216 |
}
|
|
3217 |
|
|
3218 |
extern "C" {
|
|
3219 |
typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *);
|
|
3220 |
}
|
|
3221 |
|
|
3222 |
void Threads::shutdown_vm_agents() {
|
|
3223 |
// Send any Agent_OnUnload notifications
|
|
3224 |
const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS;
|
|
3225 |
extern struct JavaVM_ main_vm;
|
|
3226 |
for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) {
|
|
3227 |
|
|
3228 |
// Find the Agent_OnUnload function.
|
|
3229 |
for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_unload_symbols); symbol_index++) {
|
|
3230 |
Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t,
|
|
3231 |
hpi::dll_lookup(agent->os_lib(), on_unload_symbols[symbol_index]));
|
|
3232 |
|
|
3233 |
// Invoke the Agent_OnUnload function
|
|
3234 |
if (unload_entry != NULL) {
|
|
3235 |
JavaThread* thread = JavaThread::current();
|
|
3236 |
ThreadToNativeFromVM ttn(thread);
|
|
3237 |
HandleMark hm(thread);
|
|
3238 |
(*unload_entry)(&main_vm);
|
|
3239 |
break;
|
|
3240 |
}
|
|
3241 |
}
|
|
3242 |
}
|
|
3243 |
}
|
|
3244 |
|
|
3245 |
// Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries
|
|
3246 |
// Invokes JVM_OnLoad
|
|
3247 |
void Threads::create_vm_init_libraries() {
|
|
3248 |
extern struct JavaVM_ main_vm;
|
|
3249 |
AgentLibrary* agent;
|
|
3250 |
|
|
3251 |
for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) {
|
|
3252 |
OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent);
|
|
3253 |
|
|
3254 |
if (on_load_entry != NULL) {
|
|
3255 |
// Invoke the JVM_OnLoad function
|
|
3256 |
JavaThread* thread = JavaThread::current();
|
|
3257 |
ThreadToNativeFromVM ttn(thread);
|
|
3258 |
HandleMark hm(thread);
|
|
3259 |
jint err = (*on_load_entry)(&main_vm, agent->options(), NULL);
|
|
3260 |
if (err != JNI_OK) {
|
|
3261 |
vm_exit_during_initialization("-Xrun library failed to init", agent->name());
|
|
3262 |
}
|
|
3263 |
} else {
|
|
3264 |
vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name());
|
|
3265 |
}
|
|
3266 |
}
|
|
3267 |
}
|
|
3268 |
|
|
3269 |
// Last thread running calls java.lang.Shutdown.shutdown()
|
|
3270 |
void JavaThread::invoke_shutdown_hooks() {
|
|
3271 |
HandleMark hm(this);
|
|
3272 |
|
|
3273 |
// We could get here with a pending exception, if so clear it now.
|
|
3274 |
if (this->has_pending_exception()) {
|
|
3275 |
this->clear_pending_exception();
|
|
3276 |
}
|
|
3277 |
|
|
3278 |
EXCEPTION_MARK;
|
|
3279 |
klassOop k =
|
|
3280 |
SystemDictionary::resolve_or_null(vmSymbolHandles::java_lang_Shutdown(),
|
|
3281 |
THREAD);
|
|
3282 |
if (k != NULL) {
|
|
3283 |
// SystemDictionary::resolve_or_null will return null if there was
|
|
3284 |
// an exception. If we cannot load the Shutdown class, just don't
|
|
3285 |
// call Shutdown.shutdown() at all. This will mean the shutdown hooks
|
|
3286 |
// and finalizers (if runFinalizersOnExit is set) won't be run.
|
|
3287 |
// Note that if a shutdown hook was registered or runFinalizersOnExit
|
|
3288 |
// was called, the Shutdown class would have already been loaded
|
|
3289 |
// (Runtime.addShutdownHook and runFinalizersOnExit will load it).
|
|
3290 |
instanceKlassHandle shutdown_klass (THREAD, k);
|
|
3291 |
JavaValue result(T_VOID);
|
|
3292 |
JavaCalls::call_static(&result,
|
|
3293 |
shutdown_klass,
|
|
3294 |
vmSymbolHandles::shutdown_method_name(),
|
|
3295 |
vmSymbolHandles::void_method_signature(),
|
|
3296 |
THREAD);
|
|
3297 |
}
|
|
3298 |
CLEAR_PENDING_EXCEPTION;
|
|
3299 |
}
|
|
3300 |
|
|
3301 |
// Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when
|
|
3302 |
// the program falls off the end of main(). Another VM exit path is through
|
|
3303 |
// vm_exit() when the program calls System.exit() to return a value or when
|
|
3304 |
// there is a serious error in VM. The two shutdown paths are not exactly
|
|
3305 |
// the same, but they share Shutdown.shutdown() at Java level and before_exit()
|
|
3306 |
// and VM_Exit op at VM level.
|
|
3307 |
//
|
|
3308 |
// Shutdown sequence:
|
|
3309 |
// + Wait until we are the last non-daemon thread to execute
|
|
3310 |
// <-- every thing is still working at this moment -->
|
|
3311 |
// + Call java.lang.Shutdown.shutdown(), which will invoke Java level
|
|
3312 |
// shutdown hooks, run finalizers if finalization-on-exit
|
|
3313 |
// + Call before_exit(), prepare for VM exit
|
|
3314 |
// > run VM level shutdown hooks (they are registered through JVM_OnExit(),
|
|
3315 |
// currently the only user of this mechanism is File.deleteOnExit())
|
|
3316 |
// > stop flat profiler, StatSampler, watcher thread, CMS threads,
|
|
3317 |
// post thread end and vm death events to JVMTI,
|
|
3318 |
// stop signal thread
|
|
3319 |
// + Call JavaThread::exit(), it will:
|
|
3320 |
// > release JNI handle blocks, remove stack guard pages
|
|
3321 |
// > remove this thread from Threads list
|
|
3322 |
// <-- no more Java code from this thread after this point -->
|
|
3323 |
// + Stop VM thread, it will bring the remaining VM to a safepoint and stop
|
|
3324 |
// the compiler threads at safepoint
|
|
3325 |
// <-- do not use anything that could get blocked by Safepoint -->
|
|
3326 |
// + Disable tracing at JNI/JVM barriers
|
|
3327 |
// + Set _vm_exited flag for threads that are still running native code
|
|
3328 |
// + Delete this thread
|
|
3329 |
// + Call exit_globals()
|
|
3330 |
// > deletes tty
|
|
3331 |
// > deletes PerfMemory resources
|
|
3332 |
// + Return to caller
|
|
3333 |
|
|
3334 |
bool Threads::destroy_vm() {
|
|
3335 |
JavaThread* thread = JavaThread::current();
|
|
3336 |
|
|
3337 |
// Wait until we are the last non-daemon thread to execute
|
|
3338 |
{ MutexLocker nu(Threads_lock);
|
|
3339 |
while (Threads::number_of_non_daemon_threads() > 1 )
|
|
3340 |
// This wait should make safepoint checks, wait without a timeout,
|
|
3341 |
// and wait as a suspend-equivalent condition.
|
|
3342 |
//
|
|
3343 |
// Note: If the FlatProfiler is running and this thread is waiting
|
|
3344 |
// for another non-daemon thread to finish, then the FlatProfiler
|
|
3345 |
// is waiting for the external suspend request on this thread to
|
|
3346 |
// complete. wait_for_ext_suspend_completion() will eventually
|
|
3347 |
// timeout, but that takes time. Making this wait a suspend-
|
|
3348 |
// equivalent condition solves that timeout problem.
|
|
3349 |
//
|
|
3350 |
Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0,
|
|
3351 |
Mutex::_as_suspend_equivalent_flag);
|
|
3352 |
}
|
|
3353 |
|
|
3354 |
// Hang forever on exit if we are reporting an error.
|
|
3355 |
if (ShowMessageBoxOnError && is_error_reported()) {
|
|
3356 |
os::infinite_sleep();
|
|
3357 |
}
|
|
3358 |
|
|
3359 |
if (JDK_Version::is_jdk12x_version()) {
|
|
3360 |
// We are the last thread running, so check if finalizers should be run.
|
|
3361 |
// For 1.3 or later this is done in thread->invoke_shutdown_hooks()
|
|
3362 |
HandleMark rm(thread);
|
|
3363 |
Universe::run_finalizers_on_exit();
|
|
3364 |
} else {
|
|
3365 |
// run Java level shutdown hooks
|
|
3366 |
thread->invoke_shutdown_hooks();
|
|
3367 |
}
|
|
3368 |
|
|
3369 |
before_exit(thread);
|
|
3370 |
|
|
3371 |
thread->exit(true);
|
|
3372 |
|
|
3373 |
// Stop VM thread.
|
|
3374 |
{
|
|
3375 |
// 4945125 The vm thread comes to a safepoint during exit.
|
|
3376 |
// GC vm_operations can get caught at the safepoint, and the
|
|
3377 |
// heap is unparseable if they are caught. Grab the Heap_lock
|
|
3378 |
// to prevent this. The GC vm_operations will not be able to
|
|
3379 |
// queue until after the vm thread is dead.
|
|
3380 |
MutexLocker ml(Heap_lock);
|
|
3381 |
|
|
3382 |
VMThread::wait_for_vm_thread_exit();
|
|
3383 |
assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint");
|
|
3384 |
VMThread::destroy();
|
|
3385 |
}
|
|
3386 |
|
|
3387 |
// clean up ideal graph printers
|
|
3388 |
#if defined(COMPILER2) && !defined(PRODUCT)
|
|
3389 |
IdealGraphPrinter::clean_up();
|
|
3390 |
#endif
|
|
3391 |
|
|
3392 |
// Now, all Java threads are gone except daemon threads. Daemon threads
|
|
3393 |
// running Java code or in VM are stopped by the Safepoint. However,
|
|
3394 |
// daemon threads executing native code are still running. But they
|
|
3395 |
// will be stopped at native=>Java/VM barriers. Note that we can't
|
|
3396 |
// simply kill or suspend them, as it is inherently deadlock-prone.
|
|
3397 |
|
|
3398 |
#ifndef PRODUCT
|
|
3399 |
// disable function tracing at JNI/JVM barriers
|
|
3400 |
TraceHPI = false;
|
|
3401 |
TraceJNICalls = false;
|
|
3402 |
TraceJVMCalls = false;
|
|
3403 |
TraceRuntimeCalls = false;
|
|
3404 |
#endif
|
|
3405 |
|
|
3406 |
VM_Exit::set_vm_exited();
|
|
3407 |
|
|
3408 |
notify_vm_shutdown();
|
|
3409 |
|
|
3410 |
delete thread;
|
|
3411 |
|
|
3412 |
// exit_globals() will delete tty
|
|
3413 |
exit_globals();
|
|
3414 |
|
|
3415 |
return true;
|
|
3416 |
}
|
|
3417 |
|
|
3418 |
|
|
3419 |
jboolean Threads::is_supported_jni_version_including_1_1(jint version) {
|
|
3420 |
if (version == JNI_VERSION_1_1) return JNI_TRUE;
|
|
3421 |
return is_supported_jni_version(version);
|
|
3422 |
}
|
|
3423 |
|
|
3424 |
|
|
3425 |
jboolean Threads::is_supported_jni_version(jint version) {
|
|
3426 |
if (version == JNI_VERSION_1_2) return JNI_TRUE;
|
|
3427 |
if (version == JNI_VERSION_1_4) return JNI_TRUE;
|
|
3428 |
if (version == JNI_VERSION_1_6) return JNI_TRUE;
|
|
3429 |
return JNI_FALSE;
|
|
3430 |
}
|
|
3431 |
|
|
3432 |
|
|
3433 |
void Threads::add(JavaThread* p, bool force_daemon) {
|
|
3434 |
// The threads lock must be owned at this point
|
|
3435 |
assert_locked_or_safepoint(Threads_lock);
|
|
3436 |
p->set_next(_thread_list);
|
|
3437 |
_thread_list = p;
|
|
3438 |
_number_of_threads++;
|
|
3439 |
oop threadObj = p->threadObj();
|
|
3440 |
bool daemon = true;
|
|
3441 |
// Bootstrapping problem: threadObj can be null for initial
|
|
3442 |
// JavaThread (or for threads attached via JNI)
|
|
3443 |
if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) {
|
|
3444 |
_number_of_non_daemon_threads++;
|
|
3445 |
daemon = false;
|
|
3446 |
}
|
|
3447 |
|
|
3448 |
ThreadService::add_thread(p, daemon);
|
|
3449 |
|
|
3450 |
// Possible GC point.
|
|
3451 |
Events::log("Thread added: " INTPTR_FORMAT, p);
|
|
3452 |
}
|
|
3453 |
|
|
3454 |
void Threads::remove(JavaThread* p) {
|
|
3455 |
// Extra scope needed for Thread_lock, so we can check
|
|
3456 |
// that we do not remove thread without safepoint code notice
|
|
3457 |
{ MutexLocker ml(Threads_lock);
|
|
3458 |
|
|
3459 |
assert(includes(p), "p must be present");
|
|
3460 |
|
|
3461 |
JavaThread* current = _thread_list;
|
|
3462 |
JavaThread* prev = NULL;
|
|
3463 |
|
|
3464 |
while (current != p) {
|
|
3465 |
prev = current;
|
|
3466 |
current = current->next();
|
|
3467 |
}
|
|
3468 |
|
|
3469 |
if (prev) {
|
|
3470 |
prev->set_next(current->next());
|
|
3471 |
} else {
|
|
3472 |
_thread_list = p->next();
|
|
3473 |
}
|
|
3474 |
_number_of_threads--;
|
|
3475 |
oop threadObj = p->threadObj();
|
|
3476 |
bool daemon = true;
|
|
3477 |
if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) {
|
|
3478 |
_number_of_non_daemon_threads--;
|
|
3479 |
daemon = false;
|
|
3480 |
|
|
3481 |
// Only one thread left, do a notify on the Threads_lock so a thread waiting
|
|
3482 |
// on destroy_vm will wake up.
|
|
3483 |
if (number_of_non_daemon_threads() == 1)
|
|
3484 |
Threads_lock->notify_all();
|
|
3485 |
}
|
|
3486 |
ThreadService::remove_thread(p, daemon);
|
|
3487 |
|
|
3488 |
// Make sure that safepoint code disregard this thread. This is needed since
|
|
3489 |
// the thread might mess around with locks after this point. This can cause it
|
|
3490 |
// to do callbacks into the safepoint code. However, the safepoint code is not aware
|
|
3491 |
// of this thread since it is removed from the queue.
|
|
3492 |
p->set_terminated_value();
|
|
3493 |
} // unlock Threads_lock
|
|
3494 |
|
|
3495 |
// Since Events::log uses a lock, we grab it outside the Threads_lock
|
|
3496 |
Events::log("Thread exited: " INTPTR_FORMAT, p);
|
|
3497 |
}
|
|
3498 |
|
|
3499 |
// Threads_lock must be held when this is called (or must be called during a safepoint)
|
|
3500 |
bool Threads::includes(JavaThread* p) {
|
|
3501 |
assert(Threads_lock->is_locked(), "sanity check");
|
|
3502 |
ALL_JAVA_THREADS(q) {
|
|
3503 |
if (q == p ) {
|
|
3504 |
return true;
|
|
3505 |
}
|
|
3506 |
}
|
|
3507 |
return false;
|
|
3508 |
}
|
|
3509 |
|
|
3510 |
// Operations on the Threads list for GC. These are not explicitly locked,
|
|
3511 |
// but the garbage collector must provide a safe context for them to run.
|
|
3512 |
// In particular, these things should never be called when the Threads_lock
|
|
3513 |
// is held by some other thread. (Note: the Safepoint abstraction also
|
|
3514 |
// uses the Threads_lock to gurantee this property. It also makes sure that
|
|
3515 |
// all threads gets blocked when exiting or starting).
|
|
3516 |
|
|
3517 |
void Threads::oops_do(OopClosure* f) {
|
|
3518 |
ALL_JAVA_THREADS(p) {
|
|
3519 |
p->oops_do(f);
|
|
3520 |
}
|
|
3521 |
VMThread::vm_thread()->oops_do(f);
|
|
3522 |
}
|
|
3523 |
|
|
3524 |
void Threads::possibly_parallel_oops_do(OopClosure* f) {
|
|
3525 |
// Introduce a mechanism allowing parallel threads to claim threads as
|
|
3526 |
// root groups. Overhead should be small enough to use all the time,
|
|
3527 |
// even in sequential code.
|
|
3528 |
SharedHeap* sh = SharedHeap::heap();
|
|
3529 |
bool is_par = (sh->n_par_threads() > 0);
|
|
3530 |
int cp = SharedHeap::heap()->strong_roots_parity();
|
|
3531 |
ALL_JAVA_THREADS(p) {
|
|
3532 |
if (p->claim_oops_do(is_par, cp)) {
|
|
3533 |
p->oops_do(f);
|
|
3534 |
}
|
|
3535 |
}
|
|
3536 |
VMThread* vmt = VMThread::vm_thread();
|
|
3537 |
if (vmt->claim_oops_do(is_par, cp))
|
|
3538 |
vmt->oops_do(f);
|
|
3539 |
}
|
|
3540 |
|
|
3541 |
#ifndef SERIALGC
|
|
3542 |
// Used by ParallelScavenge
|
|
3543 |
void Threads::create_thread_roots_tasks(GCTaskQueue* q) {
|
|
3544 |
ALL_JAVA_THREADS(p) {
|
|
3545 |
q->enqueue(new ThreadRootsTask(p));
|
|
3546 |
}
|
|
3547 |
q->enqueue(new ThreadRootsTask(VMThread::vm_thread()));
|
|
3548 |
}
|
|
3549 |
|
|
3550 |
// Used by Parallel Old
|
|
3551 |
void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) {
|
|
3552 |
ALL_JAVA_THREADS(p) {
|
|
3553 |
q->enqueue(new ThreadRootsMarkingTask(p));
|
|
3554 |
}
|
|
3555 |
q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread()));
|
|
3556 |
}
|
|
3557 |
#endif // SERIALGC
|
|
3558 |
|
|
3559 |
void Threads::nmethods_do() {
|
|
3560 |
ALL_JAVA_THREADS(p) {
|
|
3561 |
p->nmethods_do();
|
|
3562 |
}
|
|
3563 |
VMThread::vm_thread()->nmethods_do();
|
|
3564 |
}
|
|
3565 |
|
|
3566 |
void Threads::gc_epilogue() {
|
|
3567 |
ALL_JAVA_THREADS(p) {
|
|
3568 |
p->gc_epilogue();
|
|
3569 |
}
|
|
3570 |
}
|
|
3571 |
|
|
3572 |
void Threads::gc_prologue() {
|
|
3573 |
ALL_JAVA_THREADS(p) {
|
|
3574 |
p->gc_prologue();
|
|
3575 |
}
|
|
3576 |
}
|
|
3577 |
|
|
3578 |
void Threads::deoptimized_wrt_marked_nmethods() {
|
|
3579 |
ALL_JAVA_THREADS(p) {
|
|
3580 |
p->deoptimized_wrt_marked_nmethods();
|
|
3581 |
}
|
|
3582 |
}
|
|
3583 |
|
|
3584 |
|
|
3585 |
// Get count Java threads that are waiting to enter the specified monitor.
|
|
3586 |
GrowableArray<JavaThread*>* Threads::get_pending_threads(int count,
|
|
3587 |
address monitor, bool doLock) {
|
|
3588 |
assert(doLock || SafepointSynchronize::is_at_safepoint(),
|
|
3589 |
"must grab Threads_lock or be at safepoint");
|
|
3590 |
GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count);
|
|
3591 |
|
|
3592 |
int i = 0;
|
|
3593 |
{
|
|
3594 |
MutexLockerEx ml(doLock ? Threads_lock : NULL);
|
|
3595 |
ALL_JAVA_THREADS(p) {
|
|
3596 |
if (p->is_Compiler_thread()) continue;
|
|
3597 |
|
|
3598 |
address pending = (address)p->current_pending_monitor();
|
|
3599 |
if (pending == monitor) { // found a match
|
|
3600 |
if (i < count) result->append(p); // save the first count matches
|
|
3601 |
i++;
|
|
3602 |
}
|
|
3603 |
}
|
|
3604 |
}
|
|
3605 |
return result;
|
|
3606 |
}
|
|
3607 |
|
|
3608 |
|
|
3609 |
JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) {
|
|
3610 |
assert(doLock ||
|
|
3611 |
Threads_lock->owned_by_self() ||
|
|
3612 |
SafepointSynchronize::is_at_safepoint(),
|
|
3613 |
"must grab Threads_lock or be at safepoint");
|
|
3614 |
|
|
3615 |
// NULL owner means not locked so we can skip the search
|
|
3616 |
if (owner == NULL) return NULL;
|
|
3617 |
|
|
3618 |
{
|
|
3619 |
MutexLockerEx ml(doLock ? Threads_lock : NULL);
|
|
3620 |
ALL_JAVA_THREADS(p) {
|
|
3621 |
// first, see if owner is the address of a Java thread
|
|
3622 |
if (owner == (address)p) return p;
|
|
3623 |
}
|
|
3624 |
}
|
|
3625 |
assert(UseHeavyMonitors == false, "Did not find owning Java thread with UseHeavyMonitors enabled");
|
|
3626 |
if (UseHeavyMonitors) return NULL;
|
|
3627 |
|
|
3628 |
//
|
|
3629 |
// If we didn't find a matching Java thread and we didn't force use of
|
|
3630 |
// heavyweight monitors, then the owner is the stack address of the
|
|
3631 |
// Lock Word in the owning Java thread's stack.
|
|
3632 |
//
|
|
3633 |
// We can't use Thread::is_lock_owned() or Thread::lock_is_in_stack() because
|
|
3634 |
// those routines rely on the "current" stack pointer. That would be our
|
|
3635 |
// stack pointer which is not relevant to the question. Instead we use the
|
|
3636 |
// highest lock ever entered by the thread and find the thread that is
|
|
3637 |
// higher than and closest to our target stack address.
|
|
3638 |
//
|
|
3639 |
address least_diff = 0;
|
|
3640 |
bool least_diff_initialized = false;
|
|
3641 |
JavaThread* the_owner = NULL;
|
|
3642 |
{
|
|
3643 |
MutexLockerEx ml(doLock ? Threads_lock : NULL);
|
|
3644 |
ALL_JAVA_THREADS(q) {
|
|
3645 |
address addr = q->highest_lock();
|
|
3646 |
if (addr == NULL || addr < owner) continue; // thread has entered no monitors or is too low
|
|
3647 |
address diff = (address)(addr - owner);
|
|
3648 |
if (!least_diff_initialized || diff < least_diff) {
|
|
3649 |
least_diff_initialized = true;
|
|
3650 |
least_diff = diff;
|
|
3651 |
the_owner = q;
|
|
3652 |
}
|
|
3653 |
}
|
|
3654 |
}
|
|
3655 |
assert(the_owner != NULL, "Did not find owning Java thread for lock word address");
|
|
3656 |
return the_owner;
|
|
3657 |
}
|
|
3658 |
|
|
3659 |
// Threads::print_on() is called at safepoint by VM_PrintThreads operation.
|
|
3660 |
void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) {
|
|
3661 |
char buf[32];
|
|
3662 |
st->print_cr(os::local_time_string(buf, sizeof(buf)));
|
|
3663 |
|
|
3664 |
st->print_cr("Full thread dump %s (%s %s):",
|
|
3665 |
Abstract_VM_Version::vm_name(),
|
|
3666 |
Abstract_VM_Version::vm_release(),
|
|
3667 |
Abstract_VM_Version::vm_info_string()
|
|
3668 |
);
|
|
3669 |
st->cr();
|
|
3670 |
|
|
3671 |
#ifndef SERIALGC
|
|
3672 |
// Dump concurrent locks
|
|
3673 |
ConcurrentLocksDump concurrent_locks;
|
|
3674 |
if (print_concurrent_locks) {
|
|
3675 |
concurrent_locks.dump_at_safepoint();
|
|
3676 |
}
|
|
3677 |
#endif // SERIALGC
|
|
3678 |
|
|
3679 |
ALL_JAVA_THREADS(p) {
|
|
3680 |
ResourceMark rm;
|
|
3681 |
p->print_on(st);
|
|
3682 |
if (print_stacks) {
|
|
3683 |
if (internal_format) {
|
|
3684 |
p->trace_stack();
|
|
3685 |
} else {
|
|
3686 |
p->print_stack_on(st);
|
|
3687 |
}
|
|
3688 |
}
|
|
3689 |
st->cr();
|
|
3690 |
#ifndef SERIALGC
|
|
3691 |
if (print_concurrent_locks) {
|
|
3692 |
concurrent_locks.print_locks_on(p, st);
|
|
3693 |
}
|
|
3694 |
#endif // SERIALGC
|
|
3695 |
}
|
|
3696 |
|
|
3697 |
VMThread::vm_thread()->print_on(st);
|
|
3698 |
st->cr();
|
|
3699 |
Universe::heap()->print_gc_threads_on(st);
|
|
3700 |
WatcherThread* wt = WatcherThread::watcher_thread();
|
|
3701 |
if (wt != NULL) wt->print_on(st);
|
|
3702 |
st->cr();
|
|
3703 |
CompileBroker::print_compiler_threads_on(st);
|
|
3704 |
st->flush();
|
|
3705 |
}
|
|
3706 |
|
|
3707 |
// Threads::print_on_error() is called by fatal error handler. It's possible
|
|
3708 |
// that VM is not at safepoint and/or current thread is inside signal handler.
|
|
3709 |
// Don't print stack trace, as the stack may not be walkable. Don't allocate
|
|
3710 |
// memory (even in resource area), it might deadlock the error handler.
|
|
3711 |
void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) {
|
|
3712 |
bool found_current = false;
|
|
3713 |
st->print_cr("Java Threads: ( => current thread )");
|
|
3714 |
ALL_JAVA_THREADS(thread) {
|
|
3715 |
bool is_current = (current == thread);
|
|
3716 |
found_current = found_current || is_current;
|
|
3717 |
|
|
3718 |
st->print("%s", is_current ? "=>" : " ");
|
|
3719 |
|
|
3720 |
st->print(PTR_FORMAT, thread);
|
|
3721 |
st->print(" ");
|
|
3722 |
thread->print_on_error(st, buf, buflen);
|
|
3723 |
st->cr();
|
|
3724 |
}
|
|
3725 |
st->cr();
|
|
3726 |
|
|
3727 |
st->print_cr("Other Threads:");
|
|
3728 |
if (VMThread::vm_thread()) {
|
|
3729 |
bool is_current = (current == VMThread::vm_thread());
|
|
3730 |
found_current = found_current || is_current;
|
|
3731 |
st->print("%s", current == VMThread::vm_thread() ? "=>" : " ");
|
|
3732 |
|
|
3733 |
st->print(PTR_FORMAT, VMThread::vm_thread());
|
|
3734 |
st->print(" ");
|
|
3735 |
VMThread::vm_thread()->print_on_error(st, buf, buflen);
|
|
3736 |
st->cr();
|
|
3737 |
}
|
|
3738 |
WatcherThread* wt = WatcherThread::watcher_thread();
|
|
3739 |
if (wt != NULL) {
|
|
3740 |
bool is_current = (current == wt);
|
|
3741 |
found_current = found_current || is_current;
|
|
3742 |
st->print("%s", is_current ? "=>" : " ");
|
|
3743 |
|
|
3744 |
st->print(PTR_FORMAT, wt);
|
|
3745 |
st->print(" ");
|
|
3746 |
wt->print_on_error(st, buf, buflen);
|
|
3747 |
st->cr();
|
|
3748 |
}
|
|
3749 |
if (!found_current) {
|
|
3750 |
st->cr();
|
|
3751 |
st->print("=>" PTR_FORMAT " (exited) ", current);
|
|
3752 |
current->print_on_error(st, buf, buflen);
|
|
3753 |
st->cr();
|
|
3754 |
}
|
|
3755 |
}
|
|
3756 |
|
|
3757 |
|
|
3758 |
// Lifecycle management for TSM ParkEvents.
|
|
3759 |
// ParkEvents are type-stable (TSM).
|
|
3760 |
// In our particular implementation they happen to be immortal.
|
|
3761 |
//
|
|
3762 |
// We manage concurrency on the FreeList with a CAS-based
|
|
3763 |
// detach-modify-reattach idiom that avoids the ABA problems
|
|
3764 |
// that would otherwise be present in a simple CAS-based
|
|
3765 |
// push-pop implementation. (push-one and pop-all)
|
|
3766 |
//
|
|
3767 |
// Caveat: Allocate() and Release() may be called from threads
|
|
3768 |
// other than the thread associated with the Event!
|
|
3769 |
// If we need to call Allocate() when running as the thread in
|
|
3770 |
// question then look for the PD calls to initialize native TLS.
|
|
3771 |
// Native TLS (Win32/Linux/Solaris) can only be initialized or
|
|
3772 |
// accessed by the associated thread.
|
|
3773 |
// See also pd_initialize().
|
|
3774 |
//
|
|
3775 |
// Note that we could defer associating a ParkEvent with a thread
|
|
3776 |
// until the 1st time the thread calls park(). unpark() calls to
|
|
3777 |
// an unprovisioned thread would be ignored. The first park() call
|
|
3778 |
// for a thread would allocate and associate a ParkEvent and return
|
|
3779 |
// immediately.
|
|
3780 |
|
|
3781 |
volatile int ParkEvent::ListLock = 0 ;
|
|
3782 |
ParkEvent * volatile ParkEvent::FreeList = NULL ;
|
|
3783 |
|
|
3784 |
ParkEvent * ParkEvent::Allocate (Thread * t) {
|
|
3785 |
// In rare cases -- JVM_RawMonitor* operations -- we can find t == null.
|
|
3786 |
ParkEvent * ev ;
|
|
3787 |
|
|
3788 |
// Start by trying to recycle an existing but unassociated
|
|
3789 |
// ParkEvent from the global free list.
|
|
3790 |
for (;;) {
|
|
3791 |
ev = FreeList ;
|
|
3792 |
if (ev == NULL) break ;
|
|
3793 |
// 1: Detach - sequester or privatize the list
|
|
3794 |
// Tantamount to ev = Swap (&FreeList, NULL)
|
|
3795 |
if (Atomic::cmpxchg_ptr (NULL, &FreeList, ev) != ev) {
|
|
3796 |
continue ;
|
|
3797 |
}
|
|
3798 |
|
|
3799 |
// We've detached the list. The list in-hand is now
|
|
3800 |
// local to this thread. This thread can operate on the
|
|
3801 |
// list without risk of interference from other threads.
|
|
3802 |
// 2: Extract -- pop the 1st element from the list.
|
|
3803 |
ParkEvent * List = ev->FreeNext ;
|
|
3804 |
if (List == NULL) break ;
|
|
3805 |
for (;;) {
|
|
3806 |
// 3: Try to reattach the residual list
|
|
3807 |
guarantee (List != NULL, "invariant") ;
|
|
3808 |
ParkEvent * Arv = (ParkEvent *) Atomic::cmpxchg_ptr (List, &FreeList, NULL) ;
|
|
3809 |
if (Arv == NULL) break ;
|
|
3810 |
|
|
3811 |
// New nodes arrived. Try to detach the recent arrivals.
|
|
3812 |
if (Atomic::cmpxchg_ptr (NULL, &FreeList, Arv) != Arv) {
|
|
3813 |
continue ;
|
|
3814 |
}
|
|
3815 |
guarantee (Arv != NULL, "invariant") ;
|
|
3816 |
// 4: Merge Arv into List
|
|
3817 |
ParkEvent * Tail = List ;
|
|
3818 |
while (Tail->FreeNext != NULL) Tail = Tail->FreeNext ;
|
|
3819 |
Tail->FreeNext = Arv ;
|
|
3820 |
}
|
|
3821 |
break ;
|
|
3822 |
}
|
|
3823 |
|
|
3824 |
if (ev != NULL) {
|
|
3825 |
guarantee (ev->AssociatedWith == NULL, "invariant") ;
|
|
3826 |
} else {
|
|
3827 |
// Do this the hard way -- materialize a new ParkEvent.
|
|
3828 |
// In rare cases an allocating thread might detach a long list --
|
|
3829 |
// installing null into FreeList -- and then stall or be obstructed.
|
|
3830 |
// A 2nd thread calling Allocate() would see FreeList == null.
|
|
3831 |
// The list held privately by the 1st thread is unavailable to the 2nd thread.
|
|
3832 |
// In that case the 2nd thread would have to materialize a new ParkEvent,
|
|
3833 |
// even though free ParkEvents existed in the system. In this case we end up
|
|
3834 |
// with more ParkEvents in circulation than we need, but the race is
|
|
3835 |
// rare and the outcome is benign. Ideally, the # of extant ParkEvents
|
|
3836 |
// is equal to the maximum # of threads that existed at any one time.
|
|
3837 |
// Because of the race mentioned above, segments of the freelist
|
|
3838 |
// can be transiently inaccessible. At worst we may end up with the
|
|
3839 |
// # of ParkEvents in circulation slightly above the ideal.
|
|
3840 |
// Note that if we didn't have the TSM/immortal constraint, then
|
|
3841 |
// when reattaching, above, we could trim the list.
|
|
3842 |
ev = new ParkEvent () ;
|
|
3843 |
guarantee ((intptr_t(ev) & 0xFF) == 0, "invariant") ;
|
|
3844 |
}
|
|
3845 |
ev->reset() ; // courtesy to caller
|
|
3846 |
ev->AssociatedWith = t ; // Associate ev with t
|
|
3847 |
ev->FreeNext = NULL ;
|
|
3848 |
return ev ;
|
|
3849 |
}
|
|
3850 |
|
|
3851 |
void ParkEvent::Release (ParkEvent * ev) {
|
|
3852 |
if (ev == NULL) return ;
|
|
3853 |
guarantee (ev->FreeNext == NULL , "invariant") ;
|
|
3854 |
ev->AssociatedWith = NULL ;
|
|
3855 |
for (;;) {
|
|
3856 |
// Push ev onto FreeList
|
|
3857 |
// The mechanism is "half" lock-free.
|
|
3858 |
ParkEvent * List = FreeList ;
|
|
3859 |
ev->FreeNext = List ;
|
|
3860 |
if (Atomic::cmpxchg_ptr (ev, &FreeList, List) == List) break ;
|
|
3861 |
}
|
|
3862 |
}
|
|
3863 |
|
|
3864 |
// Override operator new and delete so we can ensure that the
|
|
3865 |
// least significant byte of ParkEvent addresses is 0.
|
|
3866 |
// Beware that excessive address alignment is undesirable
|
|
3867 |
// as it can result in D$ index usage imbalance as
|
|
3868 |
// well as bank access imbalance on Niagara-like platforms,
|
|
3869 |
// although Niagara's hash function should help.
|
|
3870 |
|
|
3871 |
void * ParkEvent::operator new (size_t sz) {
|
|
3872 |
return (void *) ((intptr_t (CHeapObj::operator new (sz + 256)) + 256) & -256) ;
|
|
3873 |
}
|
|
3874 |
|
|
3875 |
void ParkEvent::operator delete (void * a) {
|
|
3876 |
// ParkEvents are type-stable and immortal ...
|
|
3877 |
ShouldNotReachHere();
|
|
3878 |
}
|
|
3879 |
|
|
3880 |
|
|
3881 |
// 6399321 As a temporary measure we copied & modified the ParkEvent::
|
|
3882 |
// allocate() and release() code for use by Parkers. The Parker:: forms
|
|
3883 |
// will eventually be removed as we consolide and shift over to ParkEvents
|
|
3884 |
// for both builtin synchronization and JSR166 operations.
|
|
3885 |
|
|
3886 |
volatile int Parker::ListLock = 0 ;
|
|
3887 |
Parker * volatile Parker::FreeList = NULL ;
|
|
3888 |
|
|
3889 |
Parker * Parker::Allocate (JavaThread * t) {
|
|
3890 |
guarantee (t != NULL, "invariant") ;
|
|
3891 |
Parker * p ;
|
|
3892 |
|
|
3893 |
// Start by trying to recycle an existing but unassociated
|
|
3894 |
// Parker from the global free list.
|
|
3895 |
for (;;) {
|
|
3896 |
p = FreeList ;
|
|
3897 |
if (p == NULL) break ;
|
|
3898 |
// 1: Detach
|
|
3899 |
// Tantamount to p = Swap (&FreeList, NULL)
|
|
3900 |
if (Atomic::cmpxchg_ptr (NULL, &FreeList, p) != p) {
|
|
3901 |
continue ;
|
|
3902 |
}
|
|
3903 |
|
|
3904 |
// We've detached the list. The list in-hand is now
|
|
3905 |
// local to this thread. This thread can operate on the
|
|
3906 |
// list without risk of interference from other threads.
|
|
3907 |
// 2: Extract -- pop the 1st element from the list.
|
|
3908 |
Parker * List = p->FreeNext ;
|
|
3909 |
if (List == NULL) break ;
|
|
3910 |
for (;;) {
|
|
3911 |
// 3: Try to reattach the residual list
|
|
3912 |
guarantee (List != NULL, "invariant") ;
|
|
3913 |
Parker * Arv = (Parker *) Atomic::cmpxchg_ptr (List, &FreeList, NULL) ;
|
|
3914 |
if (Arv == NULL) break ;
|
|
3915 |
|
|
3916 |
// New nodes arrived. Try to detach the recent arrivals.
|
|
3917 |
if (Atomic::cmpxchg_ptr (NULL, &FreeList, Arv) != Arv) {
|
|
3918 |
continue ;
|
|
3919 |
}
|
|
3920 |
guarantee (Arv != NULL, "invariant") ;
|
|
3921 |
// 4: Merge Arv into List
|
|
3922 |
Parker * Tail = List ;
|
|
3923 |
while (Tail->FreeNext != NULL) Tail = Tail->FreeNext ;
|
|
3924 |
Tail->FreeNext = Arv ;
|
|
3925 |
}
|
|
3926 |
break ;
|
|
3927 |
}
|
|
3928 |
|
|
3929 |
if (p != NULL) {
|
|
3930 |
guarantee (p->AssociatedWith == NULL, "invariant") ;
|
|
3931 |
} else {
|
|
3932 |
// Do this the hard way -- materialize a new Parker..
|
|
3933 |
// In rare cases an allocating thread might detach
|
|
3934 |
// a long list -- installing null into FreeList --and
|
|
3935 |
// then stall. Another thread calling Allocate() would see
|
|
3936 |
// FreeList == null and then invoke the ctor. In this case we
|
|
3937 |
// end up with more Parkers in circulation than we need, but
|
|
3938 |
// the race is rare and the outcome is benign.
|
|
3939 |
// Ideally, the # of extant Parkers is equal to the
|
|
3940 |
// maximum # of threads that existed at any one time.
|
|
3941 |
// Because of the race mentioned above, segments of the
|
|
3942 |
// freelist can be transiently inaccessible. At worst
|
|
3943 |
// we may end up with the # of Parkers in circulation
|
|
3944 |
// slightly above the ideal.
|
|
3945 |
p = new Parker() ;
|
|
3946 |
}
|
|
3947 |
p->AssociatedWith = t ; // Associate p with t
|
|
3948 |
p->FreeNext = NULL ;
|
|
3949 |
return p ;
|
|
3950 |
}
|
|
3951 |
|
|
3952 |
|
|
3953 |
void Parker::Release (Parker * p) {
|
|
3954 |
if (p == NULL) return ;
|
|
3955 |
guarantee (p->AssociatedWith != NULL, "invariant") ;
|
|
3956 |
guarantee (p->FreeNext == NULL , "invariant") ;
|
|
3957 |
p->AssociatedWith = NULL ;
|
|
3958 |
for (;;) {
|
|
3959 |
// Push p onto FreeList
|
|
3960 |
Parker * List = FreeList ;
|
|
3961 |
p->FreeNext = List ;
|
|
3962 |
if (Atomic::cmpxchg_ptr (p, &FreeList, List) == List) break ;
|
|
3963 |
}
|
|
3964 |
}
|
|
3965 |
|
|
3966 |
void Threads::verify() {
|
|
3967 |
ALL_JAVA_THREADS(p) {
|
|
3968 |
p->verify();
|
|
3969 |
}
|
|
3970 |
VMThread* thread = VMThread::vm_thread();
|
|
3971 |
if (thread != NULL) thread->verify();
|
|
3972 |
}
|