| /* |
| * 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. |
| * |
| */ |
| |
| #ifndef SHARE_VM_RUNTIME_MUTEXLOCKER_HPP |
| #define SHARE_VM_RUNTIME_MUTEXLOCKER_HPP |
| |
| #include "memory/allocation.hpp" |
| #include "runtime/mutex.hpp" |
| |
| // Mutexes used in the VM. |
| |
| extern Mutex* Patching_lock; // a lock used to guard code patching of compiled code |
| extern Monitor* SystemDictionary_lock; // a lock on the system dictionary |
| extern Mutex* Module_lock; // a lock on module and package related data structures |
| extern Mutex* CompiledIC_lock; // a lock used to guard compiled IC patching and access |
| extern Mutex* InlineCacheBuffer_lock; // a lock used to guard the InlineCacheBuffer |
| extern Mutex* VMStatistic_lock; // a lock used to guard statistics count increment |
| extern Mutex* JNIGlobalHandle_lock; // a lock on creating JNI global handles |
| extern Mutex* JNIHandleBlockFreeList_lock; // a lock on the JNI handle block free list |
| extern Mutex* ResolvedMethodTable_lock; // a lock on the ResolvedMethodTable updates |
| extern Mutex* JmethodIdCreation_lock; // a lock on creating JNI method identifiers |
| extern Mutex* JfieldIdCreation_lock; // a lock on creating JNI static field identifiers |
| extern Monitor* JNICritical_lock; // a lock used while entering and exiting JNI critical regions, allows GC to sometimes get in |
| extern Mutex* JvmtiThreadState_lock; // a lock on modification of JVMTI thread data |
| extern Monitor* Heap_lock; // a lock on the heap |
| extern Mutex* ExpandHeap_lock; // a lock on expanding the heap |
| extern Mutex* AdapterHandlerLibrary_lock; // a lock on the AdapterHandlerLibrary |
| extern Mutex* SignatureHandlerLibrary_lock; // a lock on the SignatureHandlerLibrary |
| extern Mutex* VtableStubs_lock; // a lock on the VtableStubs |
| extern Mutex* SymbolTable_lock; // a lock on the symbol table |
| extern Mutex* StringTable_lock; // a lock on the interned string table |
| extern Monitor* StringDedupQueue_lock; // a lock on the string deduplication queue |
| extern Mutex* StringDedupTable_lock; // a lock on the string deduplication table |
| extern Monitor* CodeCache_lock; // a lock on the CodeCache, rank is special, use MutexLockerEx |
| extern Mutex* MethodData_lock; // a lock on installation of method data |
| extern Mutex* TouchedMethodLog_lock; // a lock on allocation of LogExecutedMethods info |
| extern Mutex* RetData_lock; // a lock on installation of RetData inside method data |
| extern Mutex* DerivedPointerTableGC_lock; // a lock to protect the derived pointer table |
| extern Monitor* CGCPhaseManager_lock; // a lock to protect a concurrent GC's phase management |
| extern Monitor* VMOperationQueue_lock; // a lock on queue of vm_operations waiting to execute |
| extern Monitor* VMOperationRequest_lock; // a lock on Threads waiting for a vm_operation to terminate |
| extern Monitor* Safepoint_lock; // a lock used by the safepoint abstraction |
| extern Monitor* Threads_lock; // a lock on the Threads table of active Java threads |
| // (also used by Safepoints too to block threads creation/destruction) |
| extern Monitor* CGC_lock; // used for coordination between |
| // fore- & background GC threads. |
| extern Monitor* STS_lock; // used for joining/leaving SuspendibleThreadSet. |
| extern Monitor* FullGCCount_lock; // in support of "concurrent" full gc |
| extern Mutex* SATB_Q_FL_lock; // Protects SATB Q |
| // buffer free list. |
| extern Monitor* SATB_Q_CBL_mon; // Protects SATB Q |
| // completed buffer queue. |
| extern Mutex* Shared_SATB_Q_lock; // Lock protecting SATB |
| // queue shared by |
| // non-Java threads. |
| |
| extern Mutex* DirtyCardQ_FL_lock; // Protects dirty card Q |
| // buffer free list. |
| extern Monitor* DirtyCardQ_CBL_mon; // Protects dirty card Q |
| // completed buffer queue. |
| extern Mutex* Shared_DirtyCardQ_lock; // Lock protecting dirty card |
| // queue shared by |
| // non-Java threads. |
| extern Mutex* MarkStackFreeList_lock; // Protects access to the global mark stack free list. |
| extern Mutex* MarkStackChunkList_lock; // Protects access to the global mark stack chunk list. |
| extern Mutex* ParGCRareEvent_lock; // Synchronizes various (rare) parallel GC ops. |
| extern Mutex* Compile_lock; // a lock held when Compilation is updating code (used to block CodeCache traversal, CHA updates, etc) |
| extern Monitor* MethodCompileQueue_lock; // a lock held when method compilations are enqueued, dequeued |
| extern Monitor* CompileThread_lock; // a lock held by compile threads during compilation system initialization |
| extern Monitor* Compilation_lock; // a lock used to pause compilation |
| extern Mutex* CompileTaskAlloc_lock; // a lock held when CompileTasks are allocated |
| extern Mutex* CompileStatistics_lock; // a lock held when updating compilation statistics |
| extern Mutex* DirectivesStack_lock; // a lock held when mutating the dirstack and ref counting directives |
| extern Mutex* MultiArray_lock; // a lock used to guard allocation of multi-dim arrays |
| extern Monitor* Terminator_lock; // a lock used to guard termination of the vm |
| extern Monitor* BeforeExit_lock; // a lock used to guard cleanups and shutdown hooks |
| extern Monitor* Notify_lock; // a lock used to synchronize the start-up of the vm |
| extern Mutex* ProfilePrint_lock; // a lock used to serialize the printing of profiles |
| extern Mutex* ExceptionCache_lock; // a lock used to synchronize exception cache updates |
| extern Mutex* OsrList_lock; // a lock used to serialize access to OSR queues |
| |
| #ifndef PRODUCT |
| extern Mutex* FullGCALot_lock; // a lock to make FullGCALot MT safe |
| #endif // PRODUCT |
| extern Mutex* Debug1_lock; // A bunch of pre-allocated locks that can be used for tracing |
| extern Mutex* Debug2_lock; // down synchronization related bugs! |
| extern Mutex* Debug3_lock; |
| |
| extern Mutex* RawMonitor_lock; |
| extern Mutex* PerfDataMemAlloc_lock; // a lock on the allocator for PerfData memory for performance data |
| extern Mutex* PerfDataManager_lock; // a long on access to PerfDataManager resources |
| extern Mutex* ParkerFreeList_lock; |
| extern Mutex* OopMapCacheAlloc_lock; // protects allocation of oop_map caches |
| |
| extern Mutex* FreeList_lock; // protects the free region list during safepoints |
| extern Monitor* SecondaryFreeList_lock; // protects the secondary free region list |
| extern Mutex* OldSets_lock; // protects the old region sets |
| extern Monitor* RootRegionScan_lock; // used to notify that the CM threads have finished scanning the IM snapshot regions |
| extern Mutex* MMUTracker_lock; // protects the MMU |
| // tracker data structures |
| |
| extern Mutex* Management_lock; // a lock used to serialize JVM management |
| extern Monitor* Service_lock; // a lock used for service thread operation |
| extern Monitor* PeriodicTask_lock; // protects the periodic task structure |
| extern Monitor* RedefineClasses_lock; // locks classes from parallel redefinition |
| |
| #if INCLUDE_TRACE |
| extern Mutex* JfrStacktrace_lock; // used to guard access to the JFR stacktrace table |
| extern Monitor* JfrMsg_lock; // protects JFR messaging |
| extern Mutex* JfrBuffer_lock; // protects JFR buffer operations |
| extern Mutex* JfrStream_lock; // protects JFR stream access |
| extern Mutex* JfrThreadGroups_lock; // protects JFR access to Thread Groups |
| #endif |
| |
| #ifndef SUPPORTS_NATIVE_CX8 |
| extern Mutex* UnsafeJlong_lock; // provides Unsafe atomic updates to jlongs on platforms that don't support cx8 |
| #endif |
| |
| // A MutexLocker provides mutual exclusion with respect to a given mutex |
| // for the scope which contains the locker. The lock is an OS lock, not |
| // an object lock, and the two do not interoperate. Do not use Mutex-based |
| // locks to lock on Java objects, because they will not be respected if a |
| // that object is locked using the Java locking mechanism. |
| // |
| // NOTE WELL!! |
| // |
| // See orderAccess.hpp. We assume throughout the VM that MutexLocker's |
| // and friends constructors do a fence, a lock and an acquire *in that |
| // order*. And that their destructors do a release and unlock, in *that* |
| // order. If their implementations change such that these assumptions |
| // are violated, a whole lot of code will break. |
| |
| // Print all mutexes/monitors that are currently owned by a thread; called |
| // by fatal error handler. |
| void print_owned_locks_on_error(outputStream* st); |
| |
| char *lock_name(Mutex *mutex); |
| |
| class MutexLocker: StackObj { |
| private: |
| Monitor * _mutex; |
| public: |
| MutexLocker(Monitor * mutex) { |
| assert(mutex->rank() != Mutex::special, |
| "Special ranked mutex should only use MutexLockerEx"); |
| _mutex = mutex; |
| _mutex->lock(); |
| } |
| |
| // Overloaded constructor passing current thread |
| MutexLocker(Monitor * mutex, Thread *thread) { |
| assert(mutex->rank() != Mutex::special, |
| "Special ranked mutex should only use MutexLockerEx"); |
| _mutex = mutex; |
| _mutex->lock(thread); |
| } |
| |
| ~MutexLocker() { |
| _mutex->unlock(); |
| } |
| |
| }; |
| |
| // for debugging: check that we're already owning this lock (or are at a safepoint) |
| #ifdef ASSERT |
| void assert_locked_or_safepoint(const Monitor * lock); |
| void assert_lock_strong(const Monitor * lock); |
| #else |
| #define assert_locked_or_safepoint(lock) |
| #define assert_lock_strong(lock) |
| #endif |
| |
| // A MutexLockerEx behaves like a MutexLocker when its constructor is |
| // called with a Mutex. Unlike a MutexLocker, its constructor can also be |
| // called with NULL, in which case the MutexLockerEx is a no-op. There |
| // is also a corresponding MutexUnlockerEx. We want to keep the |
| // basic MutexLocker as fast as possible. MutexLockerEx can also lock |
| // without safepoint check. |
| |
| class MutexLockerEx: public StackObj { |
| private: |
| Monitor * _mutex; |
| public: |
| MutexLockerEx(Monitor * mutex, bool no_safepoint_check = !Mutex::_no_safepoint_check_flag) { |
| _mutex = mutex; |
| if (_mutex != NULL) { |
| assert(mutex->rank() > Mutex::special || no_safepoint_check, |
| "Mutexes with rank special or lower should not do safepoint checks"); |
| if (no_safepoint_check) |
| _mutex->lock_without_safepoint_check(); |
| else |
| _mutex->lock(); |
| } |
| } |
| |
| ~MutexLockerEx() { |
| if (_mutex != NULL) { |
| _mutex->unlock(); |
| } |
| } |
| }; |
| |
| // A MonitorLockerEx is like a MutexLockerEx above, except it takes |
| // a possibly null Monitor, and allows wait/notify as well which are |
| // delegated to the underlying Monitor. |
| |
| class MonitorLockerEx: public MutexLockerEx { |
| private: |
| Monitor * _monitor; |
| public: |
| MonitorLockerEx(Monitor* monitor, |
| bool no_safepoint_check = !Mutex::_no_safepoint_check_flag): |
| MutexLockerEx(monitor, no_safepoint_check), |
| _monitor(monitor) { |
| // Superclass constructor did locking |
| } |
| |
| ~MonitorLockerEx() { |
| #ifdef ASSERT |
| if (_monitor != NULL) { |
| assert_lock_strong(_monitor); |
| } |
| #endif // ASSERT |
| // Superclass destructor will do unlocking |
| } |
| |
| bool wait(bool no_safepoint_check = !Mutex::_no_safepoint_check_flag, |
| long timeout = 0, |
| bool as_suspend_equivalent = !Mutex::_as_suspend_equivalent_flag) { |
| if (_monitor != NULL) { |
| return _monitor->wait(no_safepoint_check, timeout, as_suspend_equivalent); |
| } |
| return false; |
| } |
| |
| bool notify_all() { |
| if (_monitor != NULL) { |
| return _monitor->notify_all(); |
| } |
| return true; |
| } |
| |
| bool notify() { |
| if (_monitor != NULL) { |
| return _monitor->notify(); |
| } |
| return true; |
| } |
| }; |
| |
| |
| |
| // A GCMutexLocker is usually initialized with a mutex that is |
| // automatically acquired in order to do GC. The function that |
| // synchronizes using a GCMutexLocker may be called both during and between |
| // GC's. Thus, it must acquire the mutex if GC is not in progress, but not |
| // if GC is in progress (since the mutex is already held on its behalf.) |
| |
| class GCMutexLocker: public StackObj { |
| private: |
| Monitor * _mutex; |
| bool _locked; |
| public: |
| GCMutexLocker(Monitor * mutex); |
| ~GCMutexLocker() { if (_locked) _mutex->unlock(); } |
| }; |
| |
| |
| |
| // A MutexUnlocker temporarily exits a previously |
| // entered mutex for the scope which contains the unlocker. |
| |
| class MutexUnlocker: StackObj { |
| private: |
| Monitor * _mutex; |
| |
| public: |
| MutexUnlocker(Monitor * mutex) { |
| _mutex = mutex; |
| _mutex->unlock(); |
| } |
| |
| ~MutexUnlocker() { |
| _mutex->lock(); |
| } |
| }; |
| |
| // A MutexUnlockerEx temporarily exits a previously |
| // entered mutex for the scope which contains the unlocker. |
| |
| class MutexUnlockerEx: StackObj { |
| private: |
| Monitor * _mutex; |
| bool _no_safepoint_check; |
| |
| public: |
| MutexUnlockerEx(Monitor * mutex, bool no_safepoint_check = !Mutex::_no_safepoint_check_flag) { |
| _mutex = mutex; |
| _no_safepoint_check = no_safepoint_check; |
| _mutex->unlock(); |
| } |
| |
| ~MutexUnlockerEx() { |
| if (_no_safepoint_check == Mutex::_no_safepoint_check_flag) { |
| _mutex->lock_without_safepoint_check(); |
| } else { |
| _mutex->lock(); |
| } |
| } |
| }; |
| |
| #ifndef PRODUCT |
| // |
| // A special MutexLocker that allows: |
| // - reentrant locking |
| // - locking out of order |
| // |
| // Only to be used for verify code, where we can relax out dead-lock |
| // detection code a bit (unsafe, but probably ok). This code is NEVER to |
| // be included in a product version. |
| // |
| class VerifyMutexLocker: StackObj { |
| private: |
| Monitor * _mutex; |
| bool _reentrant; |
| public: |
| VerifyMutexLocker(Monitor * mutex) { |
| _mutex = mutex; |
| _reentrant = mutex->owned_by_self(); |
| if (!_reentrant) { |
| // We temp. disable strict safepoint checking, while we require the lock |
| FlagSetting fs(StrictSafepointChecks, false); |
| _mutex->lock(); |
| } |
| } |
| |
| ~VerifyMutexLocker() { |
| if (!_reentrant) { |
| _mutex->unlock(); |
| } |
| } |
| }; |
| |
| #endif |
| |
| #endif // SHARE_VM_RUNTIME_MUTEXLOCKER_HPP |