jdk8-mips64-public/hotspot: src/share/vm/runtime/synchronizer.hpp@624a0741915c (annotated)

src/share/vm/runtime/synchronizer.hpp@624a0741915c (annotated)

src/share/vm/runtime/synchronizer.hpp

Thu, 04 Apr 2019 17:56:29 +0800

author: aoqi
date: Thu, 04 Apr 2019 17:56:29 +0800
changeset 9572: 624a0741915c
parent 9507: 7e72702243a4
parent 8856: ac27a9c85bea
child 9852: 70aa912cebe5
permissions: -rw-r--r--

Merge

 /*
  * Copyright (c) 1998, 2018, 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_SYNCHRONIZER_HPP
 #define SHARE_VM_RUNTIME_SYNCHRONIZER_HPP
 #include "oops/markOop.hpp"
 #include "runtime/basicLock.hpp"
 #include "runtime/handles.hpp"
 #include "runtime/perfData.hpp"
 #include "utilities/top.hpp"
 class ObjectMonitor;
 class ObjectSynchronizer : AllStatic {
   friend class VMStructs;
  public:
   typedef enum {
     owner_self,
     owner_none,
     owner_other
   } LockOwnership;
   // exit must be implemented non-blocking, since the compiler cannot easily handle
   // deoptimization at monitor exit. Hence, it does not take a Handle argument.
   // This is full version of monitor enter and exit. I choose not
   // to use enter() and exit() in order to make sure user be ware
   // of the performance and semantics difference. They are normally
   // used by ObjectLocker etc. The interpreter and compiler use
   // assembly copies of these routines. Please keep them synchornized.
   //
   // attempt_rebias flag is used by UseBiasedLocking implementation
   static void fast_enter  (Handle obj, BasicLock* lock, bool attempt_rebias, TRAPS);
   static void fast_exit   (oop obj,    BasicLock* lock, Thread* THREAD);
   // WARNING: They are ONLY used to handle the slow cases. They should
   // only be used when the fast cases failed. Use of these functions
   // without previous fast case check may cause fatal error.
   static void slow_enter  (Handle obj, BasicLock* lock, TRAPS);
   static void slow_exit   (oop obj,    BasicLock* lock, Thread* THREAD);
   // Used only to handle jni locks or other unmatched monitor enter/exit
   // Internally they will use heavy weight monitor.
   static void jni_enter   (Handle obj, TRAPS);
   static bool jni_try_enter(Handle obj, Thread* THREAD); // Implements Unsafe.tryMonitorEnter
   static void jni_exit    (oop obj,    Thread* THREAD);
   // Handle all interpreter, compiler and jni cases
   static void wait               (Handle obj, jlong millis, TRAPS);
   static void notify             (Handle obj,               TRAPS);
   static void notifyall          (Handle obj,               TRAPS);
   // Special internal-use-only method for use by JVM infrastructure
   // that needs to wait() on a java-level object but that can't risk
   // throwing unexpected InterruptedExecutionExceptions.
   static void waitUninterruptibly (Handle obj, jlong Millis, Thread * THREAD) ;
   // used by classloading to free classloader object lock,
   // wait on an internal lock, and reclaim original lock
   // with original recursion count
   static intptr_t complete_exit  (Handle obj,                TRAPS);
   static void reenter            (Handle obj, intptr_t recursion, TRAPS);
   // thread-specific and global objectMonitor free list accessors
 //  static void verifyInUse (Thread * Self) ; too slow for general assert/debug
   static ObjectMonitor * omAlloc (Thread * Self) ;
   static void omRelease (Thread * Self, ObjectMonitor * m, bool FromPerThreadAlloc) ;
   static void omFlush   (Thread * Self) ;
   // Inflate light weight monitor to heavy weight monitor
   static ObjectMonitor* inflate(Thread * Self, oop obj);
   // This version is only for internal use
   static ObjectMonitor* inflate_helper(oop obj);
   // Returns the identity hash value for an oop
   // NOTE: It may cause monitor inflation
   static intptr_t identity_hash_value_for(Handle obj);
   static intptr_t FastHashCode (Thread * Self, oop obj) ;
   // java.lang.Thread support
   static bool current_thread_holds_lock(JavaThread* thread, Handle h_obj);
   static LockOwnership query_lock_ownership(JavaThread * self, Handle h_obj);
   static JavaThread* get_lock_owner(Handle h_obj, bool doLock);
   // JNI detach support
   static void release_monitors_owned_by_thread(TRAPS);
   static void monitors_iterate(MonitorClosure* m);
   // GC: we current use aggressive monitor deflation policy
   // Basically we deflate all monitors that are not busy.
   // An adaptive profile-based deflation policy could be used if needed
   static void deflate_idle_monitors();
   static int walk_monitor_list(ObjectMonitor** listheadp,
                                ObjectMonitor** FreeHeadp,
                                ObjectMonitor** FreeTailp);
   static bool deflate_monitor(ObjectMonitor* mid, oop obj, ObjectMonitor** FreeHeadp,
                               ObjectMonitor** FreeTailp);
   static void oops_do(OopClosure* f);
   // debugging
   static void sanity_checks(const bool verbose,
                             const unsigned int cache_line_size,
                             int *error_cnt_ptr, int *warning_cnt_ptr);
   static void verify() PRODUCT_RETURN;
   static int  verify_objmon_isinpool(ObjectMonitor *addr) PRODUCT_RETURN0;
   static void RegisterSpinCallback (int (*)(intptr_t, int), intptr_t) ;
  private:
   enum { _BLOCKSIZE = 128 };
   static ObjectMonitor* gBlockList;
   static ObjectMonitor * volatile gFreeList;
   static ObjectMonitor * volatile gOmInUseList; // for moribund thread, so monitors they inflated still get scanned
   static int gOmInUseCount;
 };
 // ObjectLocker enforced balanced locking and can never thrown an
 // IllegalMonitorStateException. However, a pending exception may
 // have to pass through, and we must also be able to deal with
 // asynchronous exceptions. The caller is responsible for checking
 // the threads pending exception if needed.
 // doLock was added to support classloading with UnsyncloadClass which
 // requires flag based choice of locking the classloader lock.
 class ObjectLocker : public StackObj {
  private:
   Thread*   _thread;
   Handle    _obj;
   BasicLock _lock;
   bool      _dolock;   // default true
  public:
   ObjectLocker(Handle obj, Thread* thread, bool doLock = true);
   ~ObjectLocker();
   // Monitor behavior
   void wait      (TRAPS)      { ObjectSynchronizer::wait     (_obj, 0, CHECK); } // wait forever
   void notify_all(TRAPS)      { ObjectSynchronizer::notifyall(_obj,    CHECK); }
   void waitUninterruptibly (TRAPS) { ObjectSynchronizer::waitUninterruptibly (_obj, 0, CHECK);}
   // complete_exit gives up lock completely, returning recursion count
   // reenter reclaims lock with original recursion count
   intptr_t complete_exit(TRAPS) { return  ObjectSynchronizer::complete_exit(_obj, THREAD); }
   void reenter(intptr_t recursion, TRAPS) { ObjectSynchronizer::reenter(_obj, recursion, CHECK); }
 };
 #endif // SHARE_VM_RUNTIME_SYNCHRONIZER_HPP

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src/share/vm/runtime/synchronizer.hpp@624a0741915c (annotated)

src/share/vm/runtime/synchronizer.hpp