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 /*

  * Copyright (c) 1997, 2009, 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

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  */

 // 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*   JNICachedItableIndex_lock;       // a lock on caching an itable index during JNI invoke

 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 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 Monitor* ZF_mon;                          // used for G1 conc zero-fill.

 extern Monitor* Cleanup_mon;                     // used for G1 conc cleanup.

 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

 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*   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* LowMemory_lock;                  // a lock used for low memory detection

 // 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