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