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/* |
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* Copyright (c) 1998, 2014, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_VM_RUNTIME_SYNCHRONIZER_HPP |
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#define SHARE_VM_RUNTIME_SYNCHRONIZER_HPP |
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#include "oops/markOop.hpp" |
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#include "runtime/basicLock.hpp" |
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#include "runtime/handles.hpp" |
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#include "runtime/perfData.hpp" |
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#include "utilities/top.hpp" |
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class ObjectMonitor; |
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class ObjectSynchronizer : AllStatic { |
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friend class VMStructs; |
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public: |
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typedef enum { |
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owner_self, |
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owner_none, |
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owner_other |
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} LockOwnership; |
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// exit must be implemented non-blocking, since the compiler cannot easily handle |
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// deoptimization at monitor exit. Hence, it does not take a Handle argument. |
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// This is full version of monitor enter and exit. I choose not |
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// to use enter() and exit() in order to make sure user be ware |
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// of the performance and semantics difference. They are normally |
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// used by ObjectLocker etc. The interpreter and compiler use |
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// assembly copies of these routines. Please keep them synchronized. |
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// |
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// attempt_rebias flag is used by UseBiasedLocking implementation |
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static void fast_enter(Handle obj, BasicLock* lock, bool attempt_rebias, |
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TRAPS); |
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static void fast_exit(oop obj, BasicLock* lock, Thread* THREAD); |
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// WARNING: They are ONLY used to handle the slow cases. They should |
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// only be used when the fast cases failed. Use of these functions |
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// without previous fast case check may cause fatal error. |
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static void slow_enter(Handle obj, BasicLock* lock, TRAPS); |
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static void slow_exit(oop obj, BasicLock* lock, Thread* THREAD); |
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// Used only to handle jni locks or other unmatched monitor enter/exit |
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// Internally they will use heavy weight monitor. |
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static void jni_enter(Handle obj, TRAPS); |
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static bool jni_try_enter(Handle obj, Thread* THREAD); // Implements Unsafe.tryMonitorEnter |
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static void jni_exit(oop obj, Thread* THREAD); |
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// Handle all interpreter, compiler and jni cases |
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static int wait(Handle obj, jlong millis, TRAPS); |
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static void notify(Handle obj, TRAPS); |
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static void notifyall(Handle obj, TRAPS); |
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// Special internal-use-only method for use by JVM infrastructure |
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// that needs to wait() on a java-level object but that can't risk |
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// throwing unexpected InterruptedExecutionExceptions. |
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static void waitUninterruptibly(Handle obj, jlong Millis, Thread * THREAD); |
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// used by classloading to free classloader object lock, |
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// wait on an internal lock, and reclaim original lock |
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// with original recursion count |
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static intptr_t complete_exit(Handle obj, TRAPS); |
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static void reenter (Handle obj, intptr_t recursion, TRAPS); |
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// thread-specific and global objectMonitor free list accessors |
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static void verifyInUse(Thread * Self); |
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static ObjectMonitor * omAlloc(Thread * Self); |
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static void omRelease(Thread * Self, ObjectMonitor * m, |
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bool FromPerThreadAlloc); |
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static void omFlush(Thread * Self); |
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// Inflate light weight monitor to heavy weight monitor |
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static ObjectMonitor* inflate(Thread * Self, oop obj); |
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// This version is only for internal use |
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static ObjectMonitor* inflate_helper(oop obj); |
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// Returns the identity hash value for an oop |
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// NOTE: It may cause monitor inflation |
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static intptr_t identity_hash_value_for(Handle obj); |
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static intptr_t FastHashCode(Thread * Self, oop obj); |
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// java.lang.Thread support |
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static bool current_thread_holds_lock(JavaThread* thread, Handle h_obj); |
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static LockOwnership query_lock_ownership(JavaThread * self, Handle h_obj); |
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static JavaThread* get_lock_owner(Handle h_obj, bool doLock); |
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// JNI detach support |
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static void release_monitors_owned_by_thread(TRAPS); |
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static void monitors_iterate(MonitorClosure* m); |
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// GC: we current use aggressive monitor deflation policy |
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// Basically we deflate all monitors that are not busy. |
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// An adaptive profile-based deflation policy could be used if needed |
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static void deflate_idle_monitors(); |
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static int walk_monitor_list(ObjectMonitor** listheadp, |
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ObjectMonitor** freeHeadp, |
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ObjectMonitor** freeTailp); |
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static bool deflate_monitor(ObjectMonitor* mid, oop obj, |
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ObjectMonitor** freeHeadp, |
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ObjectMonitor** freeTailp); |
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static void oops_do(OopClosure* f); |
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// debugging |
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static void sanity_checks(const bool verbose, |
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const unsigned int cache_line_size, |
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int *error_cnt_ptr, int *warning_cnt_ptr); |
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static void verify() PRODUCT_RETURN; |
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static int verify_objmon_isinpool(ObjectMonitor *addr) PRODUCT_RETURN0; |
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static void RegisterSpinCallback(int(*)(intptr_t, int), intptr_t); |
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enum { _BLOCKSIZE = 128 }; |
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static ObjectMonitor* gBlockList; |
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static ObjectMonitor * volatile gFreeList; |
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// global monitor in use list, for moribund threads, |
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// monitors they inflated need to be scanned for deflation |
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static ObjectMonitor * volatile gOmInUseList; |
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// count of entries in gOmInUseList |
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static int gOmInUseCount; |
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}; |
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// ObjectLocker enforced balanced locking and can never thrown an |
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// IllegalMonitorStateException. However, a pending exception may |
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// have to pass through, and we must also be able to deal with |
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// asynchronous exceptions. The caller is responsible for checking |
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// the threads pending exception if needed. |
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// doLock was added to support classloading with UnsyncloadClass which |
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// requires flag based choice of locking the classloader lock. |
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class ObjectLocker : public StackObj { |
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private: |
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Thread* _thread; |
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Handle _obj; |
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BasicLock _lock; |
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bool _dolock; // default true |
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public: |
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ObjectLocker(Handle obj, Thread* thread, bool doLock = true); |
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~ObjectLocker(); |
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// Monitor behavior |
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void wait(TRAPS) { ObjectSynchronizer::wait(_obj, 0, CHECK); } // wait forever |
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void notify_all(TRAPS) { ObjectSynchronizer::notifyall(_obj, CHECK); } |
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void waitUninterruptibly(TRAPS) { ObjectSynchronizer::waitUninterruptibly(_obj, 0, CHECK); } |
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// complete_exit gives up lock completely, returning recursion count |
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// reenter reclaims lock with original recursion count |
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intptr_t complete_exit(TRAPS) { return ObjectSynchronizer::complete_exit(_obj, CHECK_0); } |
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void reenter(intptr_t recursion, TRAPS) { ObjectSynchronizer::reenter(_obj, recursion, CHECK); } |
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}; |
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#endif // SHARE_VM_RUNTIME_SYNCHRONIZER_HPP |