Mercurial > hg > graal-compiler
comparison src/share/vm/runtime/synchronizer.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 b96a3e44582f |
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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 }; |