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/*
* Copyright (c) 1997, 2022, 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_RUNTIME_MUTEXLOCKER_HPP
#define SHARE_RUNTIME_MUTEXLOCKER_HPP
#include "memory/allocation.hpp"
#include "runtime/flags/flagSetting.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 Mutex* CompiledMethod_lock; // a lock used to guard a compiled method and OSR queues
extern Monitor* SystemDictionary_lock; // a lock on the system dictionary
extern Mutex* InvokeMethodTable_lock;
extern Mutex* SharedDictionary_lock; // a lock on the CDS shared dictionary
extern Monitor* ClassInitError_lock; // a lock on the class initialization error table
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* 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* EscapeBarrier_lock; // a lock to sync reallocating and relocking objects because of JVMTI access
extern Monitor* JvmtiVTMSTransition_lock; // a lock for Virtual Thread Mount State transition (VTMS transition) management
extern Monitor* Heap_lock; // a lock on the heap
#ifdef INCLUDE_PARALLELGC
extern Mutex* PSOldGenExpand_lock; // a lock on expanding the heap
#endif
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* SymbolArena_lock; // a lock on the symbol table arena
extern Monitor* StringDedup_lock; // a lock on the string deduplication facility
extern Mutex* StringDedupIntern_lock; // a lock on StringTable notification of StringDedup
extern Monitor* CodeCache_lock; // a lock on the CodeCache
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 Monitor* VMOperation_lock; // a lock on queue of vm_operations waiting to execute
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 Mutex* NonJavaThreadsList_lock; // a lock on the NonJavaThreads list
extern Mutex* NonJavaThreadsListSync_lock; // a lock for NonJavaThreads list synchronization
extern Monitor* CGC_lock; // used for coordination between
// fore- & background GC threads.
extern Monitor* STS_lock; // used for joining/leaving SuspendibleThreadSet.
extern Monitor* G1OldGCCount_lock; // in support of "concurrent" full gc
extern Mutex* G1DetachedRefinementStats_lock; // Lock protecting detached refinement stats
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* MonitoringSupport_lock; // Protects updates to the serviceability memory pools.
extern Mutex* ParGCRareEvent_lock; // Synchronizes various (rare) parallel GC ops.
extern Monitor* ConcurrentGCBreakpoints_lock; // Protects concurrent GC breakpoint management
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* InitCompleted_lock; // a lock used to signal threads waiting on init completed
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* ExceptionCache_lock; // a lock used to synchronize exception cache updates
#ifndef PRODUCT
extern Mutex* FullGCALot_lock; // a lock to make FullGCALot MT safe
#endif // PRODUCT
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* OopMapCacheAlloc_lock; // protects allocation of oop_map caches
extern Mutex* FreeList_lock; // protects the free region list during safepoints
extern Mutex* OldSets_lock; // protects the old region sets
extern Mutex* Uncommit_lock; // protects the uncommit list when not at safepoints
extern Monitor* RootRegionScan_lock; // used to notify that the CM threads have finished scanning the IM snapshot regions
extern Mutex* Management_lock; // a lock used to serialize JVM management
extern Monitor* MonitorDeflation_lock; // a lock used for monitor deflation thread operation
extern Monitor* Service_lock; // a lock used for service thread operation
extern Monitor* Notification_lock; // a lock used for notification thread operation
extern Monitor* PeriodicTask_lock; // protects the periodic task structure
extern Monitor* RedefineClasses_lock; // locks classes from parallel redefinition
extern Mutex* Verify_lock; // synchronize initialization of verify library
extern Monitor* Zip_lock; // synchronize initialization of zip library
extern Monitor* ThreadsSMRDelete_lock; // Used by ThreadsSMRSupport to take pressure off the Threads_lock
extern Mutex* ThreadIdTableCreate_lock; // Used by ThreadIdTable to lazily create the thread id table
extern Mutex* SharedDecoder_lock; // serializes access to the decoder during normal (not error reporting) use
extern Mutex* DCmdFactory_lock; // serialize access to DCmdFactory information
extern Mutex* NMTQuery_lock; // serialize NMT Dcmd queries
#if INCLUDE_CDS
#if INCLUDE_JVMTI
extern Mutex* CDSClassFileStream_lock; // FileMapInfo::open_stream_for_jvmti
#endif
extern Mutex* DumpTimeTable_lock; // SystemDictionaryShared::_dumptime_table
extern Mutex* CDSLambda_lock; // SystemDictionaryShared::get_shared_lambda_proxy_class
extern Mutex* DumpRegion_lock; // Symbol::operator new(size_t sz, int len)
extern Mutex* ClassListFile_lock; // ClassListWriter()
extern Mutex* UnregisteredClassesTable_lock; // UnregisteredClassesTableTable
extern Mutex* LambdaFormInvokers_lock; // Protecting LambdaFormInvokers::_lambdaform_lines
#endif // INCLUDE_CDS
#if INCLUDE_JFR
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 Monitor* JfrThreadSampler_lock; // used to suspend/resume JFR thread sampler
#endif
#ifndef SUPPORTS_NATIVE_CX8
extern Mutex* UnsafeJlong_lock; // provides Unsafe atomic updates to jlongs on platforms that don't support cx8
#endif
extern Mutex* Metaspace_lock; // protects Metaspace virtualspace and chunk expansions
extern Monitor* MetaspaceCritical_lock; // synchronizes failed metaspace allocations that risk throwing metaspace OOM
extern Mutex* ClassLoaderDataGraph_lock; // protects CLDG list, needed for concurrent unloading
extern Mutex* CodeHeapStateAnalytics_lock; // lock print functions against concurrent analyze functions.
// Only used locally in PrintCodeCacheLayout processing.
extern Monitor* ContinuationRelativize_lock;
#if INCLUDE_JVMCI
extern Monitor* JVMCI_lock; // protects global JVMCI critical sections
extern Monitor* JVMCIRuntime_lock; // protects critical sections for a specific JVMCIRuntime object
#endif
extern Mutex* Bootclasspath_lock;
extern Mutex* tty_lock; // lock to synchronize output.
// 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);
void print_lock_ranks(outputStream* st);
// for debugging: check that we're already owning this lock (or are at a safepoint / handshake)
#ifdef ASSERT
void assert_locked_or_safepoint(const Mutex* lock);
void assert_locked_or_safepoint_weak(const Mutex* lock);
void assert_lock_strong(const Mutex* lock);
#else
#define assert_locked_or_safepoint(lock)
#define assert_locked_or_safepoint_weak(lock)
#define assert_lock_strong(lock)
#endif
class MutexLocker: public StackObj {
protected:
Mutex* _mutex;
public:
MutexLocker(Mutex* mutex, Mutex::SafepointCheckFlag flag = Mutex::_safepoint_check_flag) :
_mutex(mutex) {
bool no_safepoint_check = flag == Mutex::_no_safepoint_check_flag;
if (_mutex != NULL) {
if (no_safepoint_check) {
_mutex->lock_without_safepoint_check();
} else {
_mutex->lock();
}
}
}
MutexLocker(Thread* thread, Mutex* mutex, Mutex::SafepointCheckFlag flag = Mutex::_safepoint_check_flag) :
_mutex(mutex) {
bool no_safepoint_check = flag == Mutex::_no_safepoint_check_flag;
if (_mutex != NULL) {
if (no_safepoint_check) {
_mutex->lock_without_safepoint_check(thread);
} else {
_mutex->lock(thread);
}
}
}
~MutexLocker() {
if (_mutex != NULL) {
assert_lock_strong(_mutex);
_mutex->unlock();
}
}
static void post_initialize();
};
// A MonitorLocker is like a MutexLocker above, except it allows
// wait/notify as well which are delegated to the underlying Monitor.
// It also disallows NULL.
class MonitorLocker: public MutexLocker {
Mutex::SafepointCheckFlag _flag;
protected:
Monitor* as_monitor() const {
return static_cast<Monitor*>(_mutex);
}
public:
MonitorLocker(Monitor* monitor, Mutex::SafepointCheckFlag flag = Mutex::_safepoint_check_flag) :
MutexLocker(monitor, flag), _flag(flag) {
// Superclass constructor did locking
assert(monitor != NULL, "NULL monitor not allowed");
}
MonitorLocker(Thread* thread, Monitor* monitor, Mutex::SafepointCheckFlag flag = Mutex::_safepoint_check_flag) :
MutexLocker(thread, monitor, flag), _flag(flag) {
// Superclass constructor did locking
assert(monitor != NULL, "NULL monitor not allowed");
}
bool wait(int64_t timeout = 0) {
return _flag == Mutex::_safepoint_check_flag ?
as_monitor()->wait(timeout) : as_monitor()->wait_without_safepoint_check(timeout);
}
void notify_all() {
as_monitor()->notify_all();
}
void notify() {
as_monitor()->notify();
}
};
// 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:
Mutex* _mutex;
bool _locked;
public:
GCMutexLocker(Mutex* 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:
Mutex* _mutex;
bool _no_safepoint_check;
public:
MutexUnlocker(Mutex* mutex, Mutex::SafepointCheckFlag flag = Mutex::_safepoint_check_flag) :
_mutex(mutex),
_no_safepoint_check(flag == Mutex::_no_safepoint_check_flag) {
_mutex->unlock();
}
~MutexUnlocker() {
if (_no_safepoint_check) {
_mutex->lock_without_safepoint_check();
} else {
_mutex->lock();
}
}
};
#endif // SHARE_RUNTIME_MUTEXLOCKER_HPP
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