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src/share/vm/runtime/synchronizer.hpp@fb57d4cf76c2 (annotated)

src/share/vm/runtime/synchronizer.hpp

Tue, 11 May 2010 14:35:43 -0700

author

prr

date

Tue, 11 May 2010 14:35:43 -0700

changeset 1840

fb57d4cf76c2

parent 435

a61af66fc99e

child 1907

c18cbe5936b8

child 1942

b96a3e44582f

permissions

-rw-r--r--

6931180: Migration to recent versions of MS Platform SDK
6951582: Build problems on win64
Summary: Changes to enable building JDK7 with Microsoft Visual Studio 2010
Reviewed-by: ohair, art, ccheung, dcubed

duke@435	1	/*
duke@435	2	* Copyright 1998-2007 Sun Microsystems, Inc. All Rights Reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	class BasicLock VALUE_OBJ_CLASS_SPEC {
duke@435	26	friend class VMStructs;
duke@435	27	private:
duke@435	28	volatile markOop _displaced_header;
duke@435	29	public:
duke@435	30	markOop displaced_header() const { return _displaced_header; }
duke@435	31	void set_displaced_header(markOop header) { _displaced_header = header; }
duke@435	32
duke@435	33	void print_on(outputStream* st) const;
duke@435	34
duke@435	35	// move a basic lock (used during deoptimization
duke@435	36	void move_to(oop obj, BasicLock* dest);
duke@435	37
duke@435	38	static int displaced_header_offset_in_bytes() { return offset_of(BasicLock, _displaced_header); }
duke@435	39	};
duke@435	40
duke@435	41	// A BasicObjectLock associates a specific Java object with a BasicLock.
duke@435	42	// It is currently embedded in an interpreter frame.
duke@435	43
duke@435	44	// Because some machines have alignment restrictions on the control stack,
duke@435	45	// the actual space allocated by the interpreter may include padding words
duke@435	46	// after the end of the BasicObjectLock. Also, in order to guarantee
duke@435	47	// alignment of the embedded BasicLock objects on such machines, we
duke@435	48	// put the embedded BasicLock at the beginning of the struct.
duke@435	49
duke@435	50	class BasicObjectLock VALUE_OBJ_CLASS_SPEC {
duke@435	51	friend class VMStructs;
duke@435	52	private:
duke@435	53	BasicLock _lock; // the lock, must be double word aligned
duke@435	54	oop _obj; // object holds the lock;
duke@435	55
duke@435	56	public:
duke@435	57	// Manipulation
duke@435	58	oop obj() const { return _obj; }
duke@435	59	void set_obj(oop obj) { _obj = obj; }
duke@435	60	BasicLock* lock() { return &_lock; }
duke@435	61
duke@435	62	// Note: Use frame::interpreter_frame_monitor_size() for the size of BasicObjectLocks
duke@435	63	// in interpreter activation frames since it includes machine-specific padding.
duke@435	64	static int size() { return sizeof(BasicObjectLock)/wordSize; }
duke@435	65
duke@435	66	// GC support
duke@435	67	void oops_do(OopClosure* f) { f->do_oop(&_obj); }
duke@435	68
duke@435	69	static int obj_offset_in_bytes() { return offset_of(BasicObjectLock, _obj); }
duke@435	70	static int lock_offset_in_bytes() { return offset_of(BasicObjectLock, _lock); }
duke@435	71	};
duke@435	72
duke@435	73	class ObjectMonitor;
duke@435	74
duke@435	75	class ObjectSynchronizer : AllStatic {
duke@435	76	friend class VMStructs;
duke@435	77	public:
duke@435	78	typedef enum {
duke@435	79	owner_self,
duke@435	80	owner_none,
duke@435	81	owner_other
duke@435	82	} LockOwnership;
duke@435	83	// exit must be implemented non-blocking, since the compiler cannot easily handle
duke@435	84	// deoptimization at monitor exit. Hence, it does not take a Handle argument.
duke@435	85
duke@435	86	// This is full version of monitor enter and exit. I choose not
duke@435	87	// to use enter() and exit() in order to make sure user be ware
duke@435	88	// of the performance and semantics difference. They are normally
duke@435	89	// used by ObjectLocker etc. The interpreter and compiler use
duke@435	90	// assembly copies of these routines. Please keep them synchornized.
duke@435	91	//
duke@435	92	// attempt_rebias flag is used by UseBiasedLocking implementation
duke@435	93	static void fast_enter (Handle obj, BasicLock* lock, bool attempt_rebias, TRAPS);
duke@435	94	static void fast_exit (oop obj, BasicLock* lock, Thread* THREAD);
duke@435	95
duke@435	96	// WARNING: They are ONLY used to handle the slow cases. They should
duke@435	97	// only be used when the fast cases failed. Use of these functions
duke@435	98	// without previous fast case check may cause fatal error.
duke@435	99	static void slow_enter (Handle obj, BasicLock* lock, TRAPS);
duke@435	100	static void slow_exit (oop obj, BasicLock* lock, Thread* THREAD);
duke@435	101
duke@435	102	// Used only to handle jni locks or other unmatched monitor enter/exit
duke@435	103	// Internally they will use heavy weight monitor.
duke@435	104	static void jni_enter (Handle obj, TRAPS);
duke@435	105	static bool jni_try_enter(Handle obj, Thread* THREAD); // Implements Unsafe.tryMonitorEnter
duke@435	106	static void jni_exit (oop obj, Thread* THREAD);
duke@435	107
duke@435	108	// Handle all interpreter, compiler and jni cases
duke@435	109	static void wait (Handle obj, jlong millis, TRAPS);
duke@435	110	static void notify (Handle obj, TRAPS);
duke@435	111	static void notifyall (Handle obj, TRAPS);
duke@435	112
duke@435	113	// Special internal-use-only method for use by JVM infrastructure
duke@435	114	// that needs to wait() on a java-level object but that can't risk
duke@435	115	// throwing unexpected InterruptedExecutionExceptions.
duke@435	116	static void waitUninterruptibly (Handle obj, jlong Millis, Thread * THREAD) ;
duke@435	117
duke@435	118	// used by classloading to free classloader object lock,
duke@435	119	// wait on an internal lock, and reclaim original lock
duke@435	120	// with original recursion count
duke@435	121	static intptr_t complete_exit (Handle obj, TRAPS);
duke@435	122	static void reenter (Handle obj, intptr_t recursion, TRAPS);
duke@435	123
duke@435	124	// thread-specific and global objectMonitor free list accessors
duke@435	125	static ObjectMonitor * omAlloc (Thread * Self) ;
duke@435	126	static void omRelease (Thread * Self, ObjectMonitor * m) ;
duke@435	127	static void omFlush (Thread * Self) ;
duke@435	128
duke@435	129	// Inflate light weight monitor to heavy weight monitor
duke@435	130	static ObjectMonitor* inflate(Thread * Self, oop obj);
duke@435	131	// This version is only for internal use
duke@435	132	static ObjectMonitor* inflate_helper(oop obj);
duke@435	133
duke@435	134	// Returns the identity hash value for an oop
duke@435	135	// NOTE: It may cause monitor inflation
duke@435	136	static intptr_t identity_hash_value_for(Handle obj);
duke@435	137	static intptr_t FastHashCode (Thread * Self, oop obj) ;
duke@435	138
duke@435	139	// java.lang.Thread support
duke@435	140	static bool current_thread_holds_lock(JavaThread* thread, Handle h_obj);
duke@435	141	static LockOwnership query_lock_ownership(JavaThread * self, Handle h_obj);
duke@435	142
duke@435	143	static JavaThread* get_lock_owner(Handle h_obj, bool doLock);
duke@435	144
duke@435	145	// JNI detach support
duke@435	146	static void release_monitors_owned_by_thread(TRAPS);
duke@435	147	static void monitors_iterate(MonitorClosure* m);
duke@435	148
duke@435	149	// GC: we current use aggressive monitor deflation policy
duke@435	150	// Basically we deflate all monitors that are not busy.
duke@435	151	// An adaptive profile-based deflation policy could be used if needed
duke@435	152	static void deflate_idle_monitors();
duke@435	153	static void oops_do(OopClosure* f);
duke@435	154
duke@435	155	// debugging
duke@435	156	static void trace_locking(Handle obj, bool is_compiled, bool is_method, bool is_locking) PRODUCT_RETURN;
duke@435	157	static void verify() PRODUCT_RETURN;
duke@435	158	static int verify_objmon_isinpool(ObjectMonitor *addr) PRODUCT_RETURN0;
duke@435	159
duke@435	160	private:
duke@435	161	enum { _BLOCKSIZE = 128 };
duke@435	162	static ObjectMonitor* gBlockList;
duke@435	163	static ObjectMonitor * volatile gFreeList;
duke@435	164
duke@435	165	public:
duke@435	166	static void Initialize () ;
duke@435	167	static PerfCounter * _sync_ContendedLockAttempts ;
duke@435	168	static PerfCounter * _sync_FutileWakeups ;
duke@435	169	static PerfCounter * _sync_Parks ;
duke@435	170	static PerfCounter * _sync_EmptyNotifications ;
duke@435	171	static PerfCounter * _sync_Notifications ;
duke@435	172	static PerfCounter * _sync_SlowEnter ;
duke@435	173	static PerfCounter * _sync_SlowExit ;
duke@435	174	static PerfCounter * _sync_SlowNotify ;
duke@435	175	static PerfCounter * _sync_SlowNotifyAll ;
duke@435	176	static PerfCounter * _sync_FailedSpins ;
duke@435	177	static PerfCounter * _sync_SuccessfulSpins ;
duke@435	178	static PerfCounter * _sync_PrivateA ;
duke@435	179	static PerfCounter * _sync_PrivateB ;
duke@435	180	static PerfCounter * _sync_MonInCirculation ;
duke@435	181	static PerfCounter * _sync_MonScavenged ;
duke@435	182	static PerfCounter * _sync_Inflations ;
duke@435	183	static PerfCounter * _sync_Deflations ;
duke@435	184	static PerfLongVariable * _sync_MonExtant ;
duke@435	185
duke@435	186	public:
duke@435	187	static void RegisterSpinCallback (int (*)(intptr_t, int), intptr_t) ;
duke@435	188
duke@435	189	};
duke@435	190
duke@435	191	// ObjectLocker enforced balanced locking and can never thrown an
duke@435	192	// IllegalMonitorStateException. However, a pending exception may
duke@435	193	// have to pass through, and we must also be able to deal with
duke@435	194	// asynchronous exceptions. The caller is responsible for checking
duke@435	195	// the threads pending exception if needed.
duke@435	196	// doLock was added to support classloading with UnsyncloadClass which
duke@435	197	// requires flag based choice of locking the classloader lock.
duke@435	198	class ObjectLocker : public StackObj {
duke@435	199	private:
duke@435	200	Thread* _thread;
duke@435	201	Handle _obj;
duke@435	202	BasicLock _lock;
duke@435	203	bool _dolock; // default true
duke@435	204	public:
duke@435	205	ObjectLocker(Handle obj, Thread* thread, bool doLock = true);
duke@435	206	~ObjectLocker();
duke@435	207
duke@435	208	// Monitor behavior
duke@435	209	void wait (TRAPS) { ObjectSynchronizer::wait (_obj, 0, CHECK); } // wait forever
duke@435	210	void notify_all(TRAPS) { ObjectSynchronizer::notifyall(_obj, CHECK); }
duke@435	211	void waitUninterruptibly (TRAPS) { ObjectSynchronizer::waitUninterruptibly (_obj, 0, CHECK);}
duke@435	212	// complete_exit gives up lock completely, returning recursion count
duke@435	213	// reenter reclaims lock with original recursion count
duke@435	214	intptr_t complete_exit(TRAPS) { return ObjectSynchronizer::complete_exit(_obj, CHECK_0); }
duke@435	215	void reenter(intptr_t recursion, TRAPS) { ObjectSynchronizer::reenter(_obj, recursion, CHECK); }
duke@435	216	};