author | acorn |
Fri, 02 Jul 2010 17:23:43 -0400 | |
changeset 5920 | 8fdbb85e62d3 |
parent 5712 | 7e82752d3fdf |
child 6975 | dc9b63952682 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1998, 2007, 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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class BasicLock VALUE_OBJ_CLASS_SPEC { |
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friend class VMStructs; |
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private: |
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volatile markOop _displaced_header; |
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public: |
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markOop displaced_header() const { return _displaced_header; } |
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void set_displaced_header(markOop header) { _displaced_header = header; } |
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void print_on(outputStream* st) const; |
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// move a basic lock (used during deoptimization |
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void move_to(oop obj, BasicLock* dest); |
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static int displaced_header_offset_in_bytes() { return offset_of(BasicLock, _displaced_header); } |
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}; |
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// A BasicObjectLock associates a specific Java object with a BasicLock. |
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// It is currently embedded in an interpreter frame. |
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// Because some machines have alignment restrictions on the control stack, |
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// the actual space allocated by the interpreter may include padding words |
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// after the end of the BasicObjectLock. Also, in order to guarantee |
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// alignment of the embedded BasicLock objects on such machines, we |
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// put the embedded BasicLock at the beginning of the struct. |
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class BasicObjectLock VALUE_OBJ_CLASS_SPEC { |
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friend class VMStructs; |
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private: |
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BasicLock _lock; // the lock, must be double word aligned |
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oop _obj; // object holds the lock; |
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public: |
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// Manipulation |
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oop obj() const { return _obj; } |
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void set_obj(oop obj) { _obj = obj; } |
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BasicLock* lock() { return &_lock; } |
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// Note: Use frame::interpreter_frame_monitor_size() for the size of BasicObjectLocks |
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// in interpreter activation frames since it includes machine-specific padding. |
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static int size() { return sizeof(BasicObjectLock)/wordSize; } |
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// GC support |
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void oops_do(OopClosure* f) { f->do_oop(&_obj); } |
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static int obj_offset_in_bytes() { return offset_of(BasicObjectLock, _obj); } |
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static int lock_offset_in_bytes() { return offset_of(BasicObjectLock, _lock); } |
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}; |
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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 synchornized. |
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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, 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 void 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) ; too slow for general assert/debug |
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static ObjectMonitor * omAlloc (Thread * Self) ; |
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static void omRelease (Thread * Self, ObjectMonitor * m, 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, 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 trace_locking(Handle obj, bool is_compiled, bool is_method, bool is_locking) PRODUCT_RETURN; |
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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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private: |
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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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static ObjectMonitor * volatile gOmInUseList; // for moribund thread, so monitors they inflated still get scanned |
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static int gOmInUseCount; |
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public: |
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static void Initialize () ; |
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static PerfCounter * _sync_ContendedLockAttempts ; |
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static PerfCounter * _sync_FutileWakeups ; |
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static PerfCounter * _sync_Parks ; |
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static PerfCounter * _sync_EmptyNotifications ; |
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static PerfCounter * _sync_Notifications ; |
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static PerfCounter * _sync_SlowEnter ; |
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static PerfCounter * _sync_SlowExit ; |
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static PerfCounter * _sync_SlowNotify ; |
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static PerfCounter * _sync_SlowNotifyAll ; |
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static PerfCounter * _sync_FailedSpins ; |
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static PerfCounter * _sync_SuccessfulSpins ; |
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static PerfCounter * _sync_PrivateA ; |
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static PerfCounter * _sync_PrivateB ; |
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static PerfCounter * _sync_MonInCirculation ; |
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static PerfCounter * _sync_MonScavenged ; |
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static PerfCounter * _sync_Inflations ; |
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static PerfCounter * _sync_Deflations ; |
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static PerfLongVariable * _sync_MonExtant ; |
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public: |
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static void RegisterSpinCallback (int (*)(intptr_t, int), intptr_t) ; |
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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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}; |