jdk8-mips64-public/hotspot: src/share/vm/runtime/mutexLocker.hpp@0fa27f37d4d4 (annotated)

src/share/vm/runtime/mutexLocker.hpp@0fa27f37d4d4 (annotated)

src/share/vm/runtime/mutexLocker.hpp

Wed, 19 Jan 2011 19:30:42 -0500

author: tonyp
date: Wed, 19 Jan 2011 19:30:42 -0500
changeset 2472: 0fa27f37d4d4
parent 2314: f95d63e2154a
child 2511: bf8517f4e4d0
permissions: -rw-r--r--

6977804: G1: remove the zero-filling thread
Summary: This changeset removes the zero-filling thread from G1 and collapses the two free region lists we had before (the "free" and "unclean" lists) into one. The new free list uses the new heap region sets / lists abstractions that we'll ultimately use it to keep track of all regions in the heap. A heap region set was also introduced for the humongous regions. Finally, this change increases the concurrency between the thread that completes freeing regions (after a cleanup pause) and the rest of the system (before we'd have to wait for said thread to complete before allocating a new region). The changest also includes a lot of refactoring and code simplification.
Reviewed-by: jcoomes, johnc

 /*
  * Copyright (c) 1997, 2011, 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
 // 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 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*   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 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
 #endif // SHARE_VM_RUNTIME_MUTEXLOCKER_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/mutexLocker.hpp@0fa27f37d4d4 (annotated)

src/share/vm/runtime/mutexLocker.hpp