--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/runtime/mutexLocker.cpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,323 @@
+/*
+ * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "runtime/mutexLocker.hpp"
+#include "runtime/os.inline.hpp"
+#include "runtime/safepoint.hpp"
+#include "runtime/thread.inline.hpp"
+#include "runtime/vmThread.hpp"
+
+// Mutexes used in the VM (see comment in mutexLocker.hpp):
+//
+// Note that the following pointers are effectively final -- after having been
+// set at JVM startup-time, they should never be subsequently mutated.
+// Instead of using pointers to malloc()ed monitors and mutexes we should consider
+// eliminating the indirection and using instances instead.
+// Consider using GCC's __read_mostly.
+
+Mutex* Patching_lock = NULL;
+Monitor* SystemDictionary_lock = NULL;
+Mutex* Module_lock = NULL;
+Mutex* CompiledIC_lock = NULL;
+Mutex* InlineCacheBuffer_lock = NULL;
+Mutex* VMStatistic_lock = NULL;
+Mutex* JNIGlobalHandle_lock = NULL;
+Mutex* JNIHandleBlockFreeList_lock = NULL;
+Mutex* ResolvedMethodTable_lock = NULL;
+Mutex* JmethodIdCreation_lock = NULL;
+Mutex* JfieldIdCreation_lock = NULL;
+Monitor* JNICritical_lock = NULL;
+Mutex* JvmtiThreadState_lock = NULL;
+Monitor* Heap_lock = NULL;
+Mutex* ExpandHeap_lock = NULL;
+Mutex* AdapterHandlerLibrary_lock = NULL;
+Mutex* SignatureHandlerLibrary_lock = NULL;
+Mutex* VtableStubs_lock = NULL;
+Mutex* SymbolTable_lock = NULL;
+Mutex* StringTable_lock = NULL;
+Monitor* StringDedupQueue_lock = NULL;
+Mutex* StringDedupTable_lock = NULL;
+Monitor* CodeCache_lock = NULL;
+Mutex* MethodData_lock = NULL;
+Mutex* TouchedMethodLog_lock = NULL;
+Mutex* RetData_lock = NULL;
+Monitor* VMOperationQueue_lock = NULL;
+Monitor* VMOperationRequest_lock = NULL;
+Monitor* Safepoint_lock = NULL;
+Monitor* SerializePage_lock = NULL;
+Monitor* Threads_lock = NULL;
+Monitor* CGC_lock = NULL;
+Monitor* STS_lock = NULL;
+Monitor* FullGCCount_lock = NULL;
+Mutex* SATB_Q_FL_lock = NULL;
+Monitor* SATB_Q_CBL_mon = NULL;
+Mutex* Shared_SATB_Q_lock = NULL;
+Mutex* DirtyCardQ_FL_lock = NULL;
+Monitor* DirtyCardQ_CBL_mon = NULL;
+Mutex* Shared_DirtyCardQ_lock = NULL;
+Mutex* MarkStackFreeList_lock = NULL;
+Mutex* MarkStackChunkList_lock = NULL;
+Mutex* ParGCRareEvent_lock = NULL;
+Mutex* DerivedPointerTableGC_lock = NULL;
+Monitor* CGCPhaseManager_lock = NULL;
+Mutex* Compile_lock = NULL;
+Monitor* MethodCompileQueue_lock = NULL;
+Monitor* CompileThread_lock = NULL;
+Monitor* Compilation_lock = NULL;
+Mutex* CompileTaskAlloc_lock = NULL;
+Mutex* CompileStatistics_lock = NULL;
+Mutex* DirectivesStack_lock = NULL;
+Mutex* MultiArray_lock = NULL;
+Monitor* Terminator_lock = NULL;
+Monitor* BeforeExit_lock = NULL;
+Monitor* Notify_lock = NULL;
+Mutex* ProfilePrint_lock = NULL;
+Mutex* ExceptionCache_lock = NULL;
+Mutex* OsrList_lock = NULL;
+
+#ifndef PRODUCT
+Mutex* FullGCALot_lock = NULL;
+#endif
+
+Mutex* Debug1_lock = NULL;
+Mutex* Debug2_lock = NULL;
+Mutex* Debug3_lock = NULL;
+
+Mutex* tty_lock = NULL;
+
+Mutex* RawMonitor_lock = NULL;
+Mutex* PerfDataMemAlloc_lock = NULL;
+Mutex* PerfDataManager_lock = NULL;
+Mutex* OopMapCacheAlloc_lock = NULL;
+
+Mutex* FreeList_lock = NULL;
+Monitor* SecondaryFreeList_lock = NULL;
+Mutex* OldSets_lock = NULL;
+Monitor* RootRegionScan_lock = NULL;
+Mutex* MMUTracker_lock = NULL;
+
+Monitor* GCTaskManager_lock = NULL;
+
+Mutex* Management_lock = NULL;
+Monitor* Service_lock = NULL;
+Monitor* PeriodicTask_lock = NULL;
+Monitor* RedefineClasses_lock = NULL;
+
+#if INCLUDE_TRACE
+Mutex* JfrStacktrace_lock = NULL;
+Monitor* JfrMsg_lock = NULL;
+Mutex* JfrBuffer_lock = NULL;
+Mutex* JfrStream_lock = NULL;
+Mutex* JfrThreadGroups_lock = NULL;
+#endif
+
+#ifndef SUPPORTS_NATIVE_CX8
+Mutex* UnsafeJlong_lock = NULL;
+#endif
+
+#define MAX_NUM_MUTEX 128
+static Monitor * _mutex_array[MAX_NUM_MUTEX];
+static int _num_mutex;
+
+#ifdef ASSERT
+void assert_locked_or_safepoint(const Monitor * lock) {
+ // check if this thread owns the lock (common case)
+ if (IgnoreLockingAssertions) return;
+ assert(lock != NULL, "Need non-NULL lock");
+ if (lock->owned_by_self()) return;
+ if (SafepointSynchronize::is_at_safepoint()) return;
+ if (!Universe::is_fully_initialized()) return;
+ // see if invoker of VM operation owns it
+ VM_Operation* op = VMThread::vm_operation();
+ if (op != NULL && op->calling_thread() == lock->owner()) return;
+ fatal("must own lock %s", lock->name());
+}
+
+// a stronger assertion than the above
+void assert_lock_strong(const Monitor * lock) {
+ if (IgnoreLockingAssertions) return;
+ assert(lock != NULL, "Need non-NULL lock");
+ if (lock->owned_by_self()) return;
+ fatal("must own lock %s", lock->name());
+}
+#endif
+
+#define def(var, type, pri, vm_block, safepoint_check_allowed ) { \
+ var = new type(Mutex::pri, #var, vm_block, safepoint_check_allowed); \
+ assert(_num_mutex < MAX_NUM_MUTEX, "increase MAX_NUM_MUTEX"); \
+ _mutex_array[_num_mutex++] = var; \
+}
+
+// Using Padded subclasses to prevent false sharing of these global monitors and mutexes.
+void mutex_init() {
+ def(tty_lock , PaddedMutex , event, true, Monitor::_safepoint_check_never); // allow to lock in VM
+
+ def(CGC_lock , PaddedMonitor, special, true, Monitor::_safepoint_check_never); // coordinate between fore- and background GC
+ def(STS_lock , PaddedMonitor, leaf, true, Monitor::_safepoint_check_never);
+
+ if (UseConcMarkSweepGC || UseG1GC) {
+ def(FullGCCount_lock , PaddedMonitor, leaf, true, Monitor::_safepoint_check_never); // in support of ExplicitGCInvokesConcurrent
+ }
+ if (UseG1GC) {
+ def(SATB_Q_FL_lock , PaddedMutex , access, true, Monitor::_safepoint_check_never);
+ def(SATB_Q_CBL_mon , PaddedMonitor, access, true, Monitor::_safepoint_check_never);
+ def(Shared_SATB_Q_lock , PaddedMutex , access + 1, true, Monitor::_safepoint_check_never);
+
+ def(DirtyCardQ_FL_lock , PaddedMutex , access, true, Monitor::_safepoint_check_never);
+ def(DirtyCardQ_CBL_mon , PaddedMonitor, access, true, Monitor::_safepoint_check_never);
+ def(Shared_DirtyCardQ_lock , PaddedMutex , access + 1, true, Monitor::_safepoint_check_never);
+
+ def(FreeList_lock , PaddedMutex , leaf , true, Monitor::_safepoint_check_never);
+ def(SecondaryFreeList_lock , PaddedMonitor, leaf , true, Monitor::_safepoint_check_never);
+ def(OldSets_lock , PaddedMutex , leaf , true, Monitor::_safepoint_check_never);
+ def(RootRegionScan_lock , PaddedMonitor, leaf , true, Monitor::_safepoint_check_never);
+ def(MMUTracker_lock , PaddedMutex , leaf , true, Monitor::_safepoint_check_never);
+
+ def(StringDedupQueue_lock , PaddedMonitor, leaf, true, Monitor::_safepoint_check_never);
+ def(StringDedupTable_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_never);
+
+ def(MarkStackFreeList_lock , PaddedMutex , leaf , true, Monitor::_safepoint_check_never);
+ def(MarkStackChunkList_lock , PaddedMutex , leaf , true, Monitor::_safepoint_check_never);
+ }
+ def(ParGCRareEvent_lock , PaddedMutex , leaf , true, Monitor::_safepoint_check_sometimes);
+ def(DerivedPointerTableGC_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_never);
+#ifdef INCLUDE_ALL_GCS
+ def(CGCPhaseManager_lock , PaddedMonitor, leaf, false, Monitor::_safepoint_check_sometimes);
+#endif
+ def(CodeCache_lock , PaddedMutex , special, true, Monitor::_safepoint_check_never);
+ def(RawMonitor_lock , PaddedMutex , special, true, Monitor::_safepoint_check_never);
+ def(OopMapCacheAlloc_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_always); // used for oop_map_cache allocation.
+
+ def(Patching_lock , PaddedMutex , special, true, Monitor::_safepoint_check_never); // used for safepointing and code patching.
+ def(Service_lock , PaddedMonitor, special, true, Monitor::_safepoint_check_never); // used for service thread operations
+ def(JmethodIdCreation_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_always); // used for creating jmethodIDs.
+
+ def(SystemDictionary_lock , PaddedMonitor, leaf, true, Monitor::_safepoint_check_always); // lookups done by VM thread
+ def(Module_lock , PaddedMutex , leaf+2, true, Monitor::_safepoint_check_always);
+ def(InlineCacheBuffer_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_always);
+ def(VMStatistic_lock , PaddedMutex , leaf, false, Monitor::_safepoint_check_always);
+ def(ExpandHeap_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_always); // Used during compilation by VM thread
+ def(JNIHandleBlockFreeList_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_never); // handles are used by VM thread
+ def(SignatureHandlerLibrary_lock , PaddedMutex , leaf, false, Monitor::_safepoint_check_always);
+ def(SymbolTable_lock , PaddedMutex , leaf+2, true, Monitor::_safepoint_check_always);
+ def(StringTable_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_always);
+ def(ProfilePrint_lock , PaddedMutex , leaf, false, Monitor::_safepoint_check_always); // serial profile printing
+ def(ExceptionCache_lock , PaddedMutex , leaf, false, Monitor::_safepoint_check_always); // serial profile printing
+ def(OsrList_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_never);
+ def(Debug1_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_never);
+#ifndef PRODUCT
+ def(FullGCALot_lock , PaddedMutex , leaf, false, Monitor::_safepoint_check_always); // a lock to make FullGCALot MT safe
+#endif
+ def(BeforeExit_lock , PaddedMonitor, leaf, true, Monitor::_safepoint_check_always);
+ def(PerfDataMemAlloc_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_always); // used for allocating PerfData memory for performance data
+ def(PerfDataManager_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_always); // used for synchronized access to PerfDataManager resources
+
+ // CMS_modUnionTable_lock leaf
+ // CMS_bitMap_lock leaf 1
+ // CMS_freeList_lock leaf 2
+
+ def(Safepoint_lock , PaddedMonitor, safepoint, true, Monitor::_safepoint_check_sometimes); // locks SnippetCache_lock/Threads_lock
+
+ def(Threads_lock , PaddedMonitor, barrier, true, Monitor::_safepoint_check_sometimes);
+
+ def(VMOperationQueue_lock , PaddedMonitor, nonleaf, true, Monitor::_safepoint_check_sometimes); // VM_thread allowed to block on these
+ def(VMOperationRequest_lock , PaddedMonitor, nonleaf, true, Monitor::_safepoint_check_sometimes);
+ def(RetData_lock , PaddedMutex , nonleaf, false, Monitor::_safepoint_check_always);
+ def(Terminator_lock , PaddedMonitor, nonleaf, true, Monitor::_safepoint_check_sometimes);
+ def(VtableStubs_lock , PaddedMutex , nonleaf, true, Monitor::_safepoint_check_always);
+ def(Notify_lock , PaddedMonitor, nonleaf, true, Monitor::_safepoint_check_always);
+ def(JNIGlobalHandle_lock , PaddedMutex , nonleaf, true, Monitor::_safepoint_check_always); // locks JNIHandleBlockFreeList_lock
+ def(JNICritical_lock , PaddedMonitor, nonleaf, true, Monitor::_safepoint_check_always); // used for JNI critical regions
+ def(AdapterHandlerLibrary_lock , PaddedMutex , nonleaf, true, Monitor::_safepoint_check_always);
+
+ def(Heap_lock , PaddedMonitor, nonleaf+1, false, Monitor::_safepoint_check_sometimes);
+ def(JfieldIdCreation_lock , PaddedMutex , nonleaf+1, true, Monitor::_safepoint_check_always); // jfieldID, Used in VM_Operation
+ def(ResolvedMethodTable_lock , PaddedMutex , nonleaf+1, false, Monitor::_safepoint_check_always); // Used to protect ResolvedMethodTable
+
+ def(CompiledIC_lock , PaddedMutex , nonleaf+2, false, Monitor::_safepoint_check_always); // locks VtableStubs_lock, InlineCacheBuffer_lock
+ def(CompileTaskAlloc_lock , PaddedMutex , nonleaf+2, true, Monitor::_safepoint_check_always);
+ def(CompileStatistics_lock , PaddedMutex , nonleaf+2, false, Monitor::_safepoint_check_always);
+ def(DirectivesStack_lock , PaddedMutex , special, true, Monitor::_safepoint_check_never);
+ def(MultiArray_lock , PaddedMutex , nonleaf+2, false, Monitor::_safepoint_check_always); // locks SymbolTable_lock
+
+ def(JvmtiThreadState_lock , PaddedMutex , nonleaf+2, false, Monitor::_safepoint_check_always); // Used by JvmtiThreadState/JvmtiEventController
+ def(Management_lock , PaddedMutex , nonleaf+2, false, Monitor::_safepoint_check_always); // used for JVM management
+
+ def(Compile_lock , PaddedMutex , nonleaf+3, true, Monitor::_safepoint_check_sometimes);
+ def(MethodData_lock , PaddedMutex , nonleaf+3, false, Monitor::_safepoint_check_always);
+ def(TouchedMethodLog_lock , PaddedMutex , nonleaf+3, false, Monitor::_safepoint_check_always);
+
+ def(MethodCompileQueue_lock , PaddedMonitor, nonleaf+4, true, Monitor::_safepoint_check_always);
+ def(Debug2_lock , PaddedMutex , nonleaf+4, true, Monitor::_safepoint_check_never);
+ def(Debug3_lock , PaddedMutex , nonleaf+4, true, Monitor::_safepoint_check_never);
+ def(CompileThread_lock , PaddedMonitor, nonleaf+5, false, Monitor::_safepoint_check_always);
+ def(PeriodicTask_lock , PaddedMonitor, nonleaf+5, true, Monitor::_safepoint_check_sometimes);
+ def(RedefineClasses_lock , PaddedMonitor, nonleaf+5, true, Monitor::_safepoint_check_always);
+ if (WhiteBoxAPI) {
+ def(Compilation_lock , PaddedMonitor, leaf, false, Monitor::_safepoint_check_never);
+ }
+
+#if INCLUDE_TRACE
+ def(JfrMsg_lock , PaddedMonitor, leaf, true, Monitor::_safepoint_check_always);
+ def(JfrBuffer_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_never);
+ def(JfrThreadGroups_lock , PaddedMutex , leaf, true, Monitor::_safepoint_check_always);
+ def(JfrStream_lock , PaddedMutex , leaf+1, true, Monitor::_safepoint_check_never); // ensure to rank lower than 'safepoint'
+ def(JfrStacktrace_lock , PaddedMutex , special, true, Monitor::_safepoint_check_sometimes);
+#endif
+
+#ifndef SUPPORTS_NATIVE_CX8
+ def(UnsafeJlong_lock , PaddedMutex , special, false, Monitor::_safepoint_check_never);
+#endif
+}
+
+GCMutexLocker::GCMutexLocker(Monitor * mutex) {
+ if (SafepointSynchronize::is_at_safepoint()) {
+ _locked = false;
+ } else {
+ _mutex = mutex;
+ _locked = true;
+ _mutex->lock();
+ }
+}
+
+// Print all mutexes/monitors that are currently owned by a thread; called
+// by fatal error handler.
+void print_owned_locks_on_error(outputStream* st) {
+ st->print("VM Mutex/Monitor currently owned by a thread: ");
+ bool none = true;
+ for (int i = 0; i < _num_mutex; i++) {
+ // see if it has an owner
+ if (_mutex_array[i]->owner() != NULL) {
+ if (none) {
+ // print format used by Mutex::print_on_error()
+ st->print_cr(" ([mutex/lock_event])");
+ none = false;
+ }
+ _mutex_array[i]->print_on_error(st);
+ st->cr();
+ }
+ }
+ if (none) st->print_cr("None");
+}