jdk8-mips64-public/hotspot: src/share/vm/runtime/mutexLocker.hpp@595c0f60d50d (annotated)

src/share/vm/runtime/mutexLocker.hpp@595c0f60d50d (annotated)

src/share/vm/runtime/mutexLocker.hpp

Tue, 18 Mar 2014 19:07:22 +0100

author: pliden
date: Tue, 18 Mar 2014 19:07:22 +0100
changeset 6413: 595c0f60d50d
parent 5732: b2e698d2276c
child 6518: 62c54fcc0a35
permissions: -rw-r--r--

8029075: String deduplication in G1
Summary: Implementation of JEP 192, http://openjdk.java.net/jeps/192
Reviewed-by: brutisso, tschatzl, coleenp

 /*
  * Copyright (c) 1997, 2014, 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"
 #ifdef TARGET_OS_FAMILY_linux
 # include "os_linux.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_solaris
 # include "os_solaris.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_windows
 # include "os_windows.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_bsd
 # include "os_bsd.inline.hpp"
 #endif
 // 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 dictonary
 extern Mutex*   PackageTable_lock;               // a lock on the class loader package table
 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*   MemberNameTable_lock;            // a lock on the MemberNameTable 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* JvmtiPendingEvent_lock;          // a lock on the JVMTI pending events list
 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 Mutex*   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*   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* 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 Mutex*   STS_init_lock;                   // coordinate initialization of SuspendibleThreadSets.
 extern Monitor* SLT_lock;                        // used in CMS GC for acquiring PLL
 extern Monitor* iCMS_lock;                       // CMS incremental mode start/stop notification
 extern Monitor* FullGCCount_lock;                // in support of "concurrent" full gc
 extern Monitor* CMark_lock;                      // used for concurrent mark thread coordination
 extern Mutex*   CMRegionStack_lock;              // used for protecting accesses to the CM region stack
 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.
                                                  // (see option ExplicitGCInvokesConcurrent)
 extern Mutex*   ParGCRareEvent_lock;             // Synchronizes various (rare) parallel GC ops.
 extern Mutex*   EvacFailureStack_lock;           // guards the evac failure scan stack
 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 Mutex*   CompileTaskAlloc_lock;           // a lock held when CompileTasks are allocated
 extern Mutex*   CompileStatistics_lock;          // a lock held when updating compilation statistics
 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 Monitor* Interrupt_lock;                  // a lock used for condition variable mediated interrupt processing
 extern Monitor* ProfileVM_lock;                  // a lock used for profiling the VMThread
 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*   HotCardCache_lock;               // protects the hot card cache
 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
 #ifdef 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
 // 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 too be used for verify code, where we can relaxe out dead-lock
 // dection 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. diable 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

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/mutexLocker.hpp@595c0f60d50d (annotated)

src/share/vm/runtime/mutexLocker.hpp