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/*
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* Copyright 1997-2008 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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// Mutexes used in the VM.
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extern Mutex* Patching_lock; // a lock used to guard code patching of compiled code
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extern Monitor* SystemDictionary_lock; // a lock on the system dictonary
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extern Mutex* PackageTable_lock; // a lock on the class loader package table
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extern Mutex* CompiledIC_lock; // a lock used to guard compiled IC patching and access
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extern Mutex* InlineCacheBuffer_lock; // a lock used to guard the InlineCacheBuffer
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extern Mutex* VMStatistic_lock; // a lock used to guard statistics count increment
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extern Mutex* JNIGlobalHandle_lock; // a lock on creating JNI global handles
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extern Mutex* JNIHandleBlockFreeList_lock; // a lock on the JNI handle block free list
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extern Mutex* JNICachedItableIndex_lock; // a lock on caching an itable index during JNI invoke
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extern Mutex* JmethodIdCreation_lock; // a lock on creating JNI method identifiers
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extern Mutex* JfieldIdCreation_lock; // a lock on creating JNI static field identifiers
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extern Monitor* JNICritical_lock; // a lock used while entering and exiting JNI critical regions, allows GC to sometimes get in
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extern Mutex* JvmtiThreadState_lock; // a lock on modification of JVMTI thread data
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extern Monitor* JvmtiPendingEvent_lock; // a lock on the JVMTI pending events list
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extern Mutex* Heap_lock; // a lock on the heap
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extern Mutex* ExpandHeap_lock; // a lock on expanding the heap
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extern Mutex* AdapterHandlerLibrary_lock; // a lock on the AdapterHandlerLibrary
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extern Mutex* SignatureHandlerLibrary_lock; // a lock on the SignatureHandlerLibrary
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extern Mutex* VtableStubs_lock; // a lock on the VtableStubs
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extern Mutex* SymbolTable_lock; // a lock on the symbol table
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extern Mutex* StringTable_lock; // a lock on the interned string table
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extern Mutex* CodeCache_lock; // a lock on the CodeCache, rank is special, use MutexLockerEx
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extern Mutex* MethodData_lock; // a lock on installation of method data
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extern Mutex* RetData_lock; // a lock on installation of RetData inside method data
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extern Mutex* DerivedPointerTableGC_lock; // a lock to protect the derived pointer table
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extern Monitor* VMOperationQueue_lock; // a lock on queue of vm_operations waiting to execute
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extern Monitor* VMOperationRequest_lock; // a lock on Threads waiting for a vm_operation to terminate
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extern Monitor* Safepoint_lock; // a lock used by the safepoint abstraction
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extern Monitor* Threads_lock; // a lock on the Threads table of active Java threads
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// (also used by Safepoints too to block threads creation/destruction)
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extern Monitor* CGC_lock; // used for coordination between
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// fore- & background GC threads.
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extern Mutex* STS_init_lock; // coordinate initialization of SuspendibleThreadSets.
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extern Monitor* SLT_lock; // used in CMS GC for acquiring PLL
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extern Monitor* iCMS_lock; // CMS incremental mode start/stop notification
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extern Monitor* FullGCCount_lock; // in support of "concurrent" full gc
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// (see option ExplicitGCInvokesConcurrent)
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extern Mutex* ParGCRareEvent_lock; // Synchronizes various (rare) parallel GC ops.
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extern Mutex* Compile_lock; // a lock held when Compilation is updating code (used to block CodeCache traversal, CHA updates, etc)
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extern Monitor* MethodCompileQueue_lock; // a lock held when method compilations are enqueued, dequeued
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#ifdef TIERED
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extern Monitor* C1_lock; // a lock to ensure on single c1 compile is ever active
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#endif // TIERED
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extern Monitor* CompileThread_lock; // a lock held by compile threads during compilation system initialization
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extern Mutex* CompileTaskAlloc_lock; // a lock held when CompileTasks are allocated
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extern Mutex* CompileStatistics_lock; // a lock held when updating compilation statistics
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extern Mutex* MultiArray_lock; // a lock used to guard allocation of multi-dim arrays
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extern Monitor* Terminator_lock; // a lock used to guard termination of the vm
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extern Monitor* BeforeExit_lock; // a lock used to guard cleanups and shutdown hooks
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extern Monitor* Notify_lock; // a lock used to synchronize the start-up of the vm
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extern Monitor* Interrupt_lock; // a lock used for condition variable mediated interrupt processing
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extern Monitor* ProfileVM_lock; // a lock used for profiling the VMThread
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extern Mutex* ProfilePrint_lock; // a lock used to serialize the printing of profiles
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extern Mutex* ExceptionCache_lock; // a lock used to synchronize exception cache updates
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extern Mutex* OsrList_lock; // a lock used to serialize access to OSR queues
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#ifndef PRODUCT
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extern Mutex* FullGCALot_lock; // a lock to make FullGCALot MT safe
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#endif
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extern Mutex* Debug1_lock; // A bunch of pre-allocated locks that can be used for tracing
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extern Mutex* Debug2_lock; // down synchronization related bugs!
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extern Mutex* Debug3_lock;
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extern Mutex* RawMonitor_lock;
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extern Mutex* PerfDataMemAlloc_lock; // a lock on the allocator for PerfData memory for performance data
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extern Mutex* PerfDataManager_lock; // a long on access to PerfDataManager resources
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extern Mutex* ParkerFreeList_lock;
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extern Mutex* OopMapCacheAlloc_lock; // protects allocation of oop_map caches
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extern Mutex* Management_lock; // a lock used to serialize JVM management
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extern Monitor* LowMemory_lock; // a lock used for low memory detection
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// A MutexLocker provides mutual exclusion with respect to a given mutex
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// for the scope which contains the locker. The lock is an OS lock, not
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// an object lock, and the two do not interoperate. Do not use Mutex-based
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// locks to lock on Java objects, because they will not be respected if a
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// that object is locked using the Java locking mechanism.
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//
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// NOTE WELL!!
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//
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// See orderAccess.hpp. We assume throughout the VM that MutexLocker's
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// and friends constructors do a fence, a lock and an acquire *in that
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// order*. And that their destructors do a release and unlock, in *that*
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// order. If their implementations change such that these assumptions
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// are violated, a whole lot of code will break.
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// Print all mutexes/monitors that are currently owned by a thread; called
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// by fatal error handler.
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void print_owned_locks_on_error(outputStream* st);
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char *lock_name(Mutex *mutex);
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class MutexLocker: StackObj {
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private:
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Monitor * _mutex;
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public:
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MutexLocker(Monitor * mutex) {
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assert(mutex->rank() != Mutex::special,
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"Special ranked mutex should only use MutexLockerEx");
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_mutex = mutex;
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_mutex->lock();
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}
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// Overloaded constructor passing current thread
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MutexLocker(Monitor * mutex, Thread *thread) {
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assert(mutex->rank() != Mutex::special,
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"Special ranked mutex should only use MutexLockerEx");
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_mutex = mutex;
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_mutex->lock(thread);
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}
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~MutexLocker() {
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_mutex->unlock();
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}
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};
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// for debugging: check that we're already owning this lock (or are at a safepoint)
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#ifdef ASSERT
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void assert_locked_or_safepoint(const Monitor * lock);
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void assert_lock_strong(const Monitor * lock);
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#else
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#define assert_locked_or_safepoint(lock)
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#define assert_lock_strong(lock)
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#endif
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// A MutexLockerEx behaves like a MutexLocker when its constructor is
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// called with a Mutex. Unlike a MutexLocker, its constructor can also be
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// called with NULL, in which case the MutexLockerEx is a no-op. There
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// is also a corresponding MutexUnlockerEx. We want to keep the
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// basic MutexLocker as fast as possible. MutexLockerEx can also lock
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// without safepoint check.
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class MutexLockerEx: public StackObj {
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private:
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Monitor * _mutex;
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public:
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MutexLockerEx(Monitor * mutex, bool no_safepoint_check = !Mutex::_no_safepoint_check_flag) {
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_mutex = mutex;
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if (_mutex != NULL) {
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assert(mutex->rank() > Mutex::special || no_safepoint_check,
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"Mutexes with rank special or lower should not do safepoint checks");
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if (no_safepoint_check)
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_mutex->lock_without_safepoint_check();
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else
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_mutex->lock();
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}
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}
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~MutexLockerEx() {
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if (_mutex != NULL) {
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_mutex->unlock();
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}
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}
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};
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// A MonitorLockerEx is like a MutexLockerEx above, except it takes
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// a possibly null Monitor, and allows wait/notify as well which are
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// delegated to the underlying Monitor.
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class MonitorLockerEx: public MutexLockerEx {
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private:
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Monitor * _monitor;
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public:
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MonitorLockerEx(Monitor* monitor,
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bool no_safepoint_check = !Mutex::_no_safepoint_check_flag):
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MutexLockerEx(monitor, no_safepoint_check),
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_monitor(monitor) {
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// Superclass constructor did locking
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}
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~MonitorLockerEx() {
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#ifdef ASSERT
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if (_monitor != NULL) {
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assert_lock_strong(_monitor);
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}
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#endif // ASSERT
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// Superclass destructor will do unlocking
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}
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bool wait(bool no_safepoint_check = !Mutex::_no_safepoint_check_flag,
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long timeout = 0,
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bool as_suspend_equivalent = !Mutex::_as_suspend_equivalent_flag) {
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if (_monitor != NULL) {
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return _monitor->wait(no_safepoint_check, timeout, as_suspend_equivalent);
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}
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return false;
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}
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bool notify_all() {
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if (_monitor != NULL) {
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return _monitor->notify_all();
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}
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return true;
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}
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bool notify() {
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if (_monitor != NULL) {
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return _monitor->notify();
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}
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return true;
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}
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};
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// A GCMutexLocker is usually initialized with a mutex that is
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// automatically acquired in order to do GC. The function that
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// synchronizes using a GCMutexLocker may be called both during and between
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// GC's. Thus, it must acquire the mutex if GC is not in progress, but not
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// if GC is in progress (since the mutex is already held on its behalf.)
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class GCMutexLocker: public StackObj {
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private:
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Monitor * _mutex;
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bool _locked;
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public:
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GCMutexLocker(Monitor * mutex);
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~GCMutexLocker() { if (_locked) _mutex->unlock(); }
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};
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// A MutexUnlocker temporarily exits a previously
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// entered mutex for the scope which contains the unlocker.
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class MutexUnlocker: StackObj {
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private:
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Monitor * _mutex;
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public:
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MutexUnlocker(Monitor * mutex) {
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_mutex = mutex;
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_mutex->unlock();
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}
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~MutexUnlocker() {
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_mutex->lock();
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}
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};
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// A MutexUnlockerEx temporarily exits a previously
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// entered mutex for the scope which contains the unlocker.
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class MutexUnlockerEx: StackObj {
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private:
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Monitor * _mutex;
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bool _no_safepoint_check;
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public:
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MutexUnlockerEx(Monitor * mutex, bool no_safepoint_check = !Mutex::_no_safepoint_check_flag) {
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_mutex = mutex;
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_no_safepoint_check = no_safepoint_check;
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_mutex->unlock();
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}
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~MutexUnlockerEx() {
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if (_no_safepoint_check == Mutex::_no_safepoint_check_flag) {
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_mutex->lock_without_safepoint_check();
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} else {
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_mutex->lock();
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}
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}
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};
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#ifndef PRODUCT
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//
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// A special MutexLocker that allows:
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// - reentrant locking
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// - locking out of order
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//
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// Only too be used for verify code, where we can relaxe out dead-lock
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// dection code a bit (unsafe, but probably ok). This code is NEVER to
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// be included in a product version.
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//
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class VerifyMutexLocker: StackObj {
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private:
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Monitor * _mutex;
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bool _reentrant;
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public:
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VerifyMutexLocker(Monitor * mutex) {
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_mutex = mutex;
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_reentrant = mutex->owned_by_self();
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if (!_reentrant) {
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// We temp. diable strict safepoint checking, while we require the lock
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FlagSetting fs(StrictSafepointChecks, false);
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_mutex->lock();
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}
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}
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~VerifyMutexLocker() {
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if (!_reentrant) {
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_mutex->unlock();
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}
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}
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};
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#endif
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