217 lines
9.2 KiB
C++
217 lines
9.2 KiB
C++
/*
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* Copyright 1998-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any 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 ObjectMonitor * omAlloc (Thread * Self) ;
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static void omRelease (Thread * Self, ObjectMonitor * m) ;
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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 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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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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};
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