Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/synchronizer.hpp @ 1930:2d26b0046e0d
Merge.
author | Thomas Wuerthinger <wuerthinger@ssw.jku.at> |
---|---|
date | Tue, 30 Nov 2010 14:53:30 +0100 |
parents | fa83ab460c54 |
children | f95d63e2154a |
rev | line source |
---|---|
0 | 1 /* |
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
2 * Copyright (c) 1998, 2007, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 | |
26 class ObjectMonitor; | |
27 | |
28 class ObjectSynchronizer : AllStatic { | |
29 friend class VMStructs; | |
30 public: | |
31 typedef enum { | |
32 owner_self, | |
33 owner_none, | |
34 owner_other | |
35 } LockOwnership; | |
36 // exit must be implemented non-blocking, since the compiler cannot easily handle | |
37 // deoptimization at monitor exit. Hence, it does not take a Handle argument. | |
38 | |
39 // This is full version of monitor enter and exit. I choose not | |
40 // to use enter() and exit() in order to make sure user be ware | |
41 // of the performance and semantics difference. They are normally | |
42 // used by ObjectLocker etc. The interpreter and compiler use | |
43 // assembly copies of these routines. Please keep them synchornized. | |
44 // | |
45 // attempt_rebias flag is used by UseBiasedLocking implementation | |
46 static void fast_enter (Handle obj, BasicLock* lock, bool attempt_rebias, TRAPS); | |
47 static void fast_exit (oop obj, BasicLock* lock, Thread* THREAD); | |
48 | |
49 // WARNING: They are ONLY used to handle the slow cases. They should | |
50 // only be used when the fast cases failed. Use of these functions | |
51 // without previous fast case check may cause fatal error. | |
52 static void slow_enter (Handle obj, BasicLock* lock, TRAPS); | |
53 static void slow_exit (oop obj, BasicLock* lock, Thread* THREAD); | |
54 | |
55 // Used only to handle jni locks or other unmatched monitor enter/exit | |
56 // Internally they will use heavy weight monitor. | |
57 static void jni_enter (Handle obj, TRAPS); | |
58 static bool jni_try_enter(Handle obj, Thread* THREAD); // Implements Unsafe.tryMonitorEnter | |
59 static void jni_exit (oop obj, Thread* THREAD); | |
60 | |
61 // Handle all interpreter, compiler and jni cases | |
62 static void wait (Handle obj, jlong millis, TRAPS); | |
63 static void notify (Handle obj, TRAPS); | |
64 static void notifyall (Handle obj, TRAPS); | |
65 | |
66 // Special internal-use-only method for use by JVM infrastructure | |
67 // that needs to wait() on a java-level object but that can't risk | |
68 // throwing unexpected InterruptedExecutionExceptions. | |
69 static void waitUninterruptibly (Handle obj, jlong Millis, Thread * THREAD) ; | |
70 | |
71 // used by classloading to free classloader object lock, | |
72 // wait on an internal lock, and reclaim original lock | |
73 // with original recursion count | |
74 static intptr_t complete_exit (Handle obj, TRAPS); | |
75 static void reenter (Handle obj, intptr_t recursion, TRAPS); | |
76 | |
77 // thread-specific and global objectMonitor free list accessors | |
1640
bfc89697cccb
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
1589
diff
changeset
|
78 // static void verifyInUse (Thread * Self) ; too slow for general assert/debug |
0 | 79 static ObjectMonitor * omAlloc (Thread * Self) ; |
1640
bfc89697cccb
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
1589
diff
changeset
|
80 static void omRelease (Thread * Self, ObjectMonitor * m, bool FromPerThreadAlloc) ; |
0 | 81 static void omFlush (Thread * Self) ; |
82 | |
83 // Inflate light weight monitor to heavy weight monitor | |
84 static ObjectMonitor* inflate(Thread * Self, oop obj); | |
85 // This version is only for internal use | |
86 static ObjectMonitor* inflate_helper(oop obj); | |
87 | |
88 // Returns the identity hash value for an oop | |
89 // NOTE: It may cause monitor inflation | |
90 static intptr_t identity_hash_value_for(Handle obj); | |
91 static intptr_t FastHashCode (Thread * Self, oop obj) ; | |
92 | |
93 // java.lang.Thread support | |
94 static bool current_thread_holds_lock(JavaThread* thread, Handle h_obj); | |
95 static LockOwnership query_lock_ownership(JavaThread * self, Handle h_obj); | |
96 | |
97 static JavaThread* get_lock_owner(Handle h_obj, bool doLock); | |
98 | |
99 // JNI detach support | |
100 static void release_monitors_owned_by_thread(TRAPS); | |
101 static void monitors_iterate(MonitorClosure* m); | |
102 | |
103 // GC: we current use aggressive monitor deflation policy | |
104 // Basically we deflate all monitors that are not busy. | |
105 // An adaptive profile-based deflation policy could be used if needed | |
106 static void deflate_idle_monitors(); | |
1640
bfc89697cccb
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
1589
diff
changeset
|
107 static int walk_monitor_list(ObjectMonitor** listheadp, |
bfc89697cccb
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
1589
diff
changeset
|
108 ObjectMonitor** FreeHeadp, |
bfc89697cccb
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
1589
diff
changeset
|
109 ObjectMonitor** FreeTailp); |
1587 | 110 static bool deflate_monitor(ObjectMonitor* mid, oop obj, ObjectMonitor** FreeHeadp, |
111 ObjectMonitor** FreeTailp); | |
0 | 112 static void oops_do(OopClosure* f); |
113 | |
114 // debugging | |
115 static void trace_locking(Handle obj, bool is_compiled, bool is_method, bool is_locking) PRODUCT_RETURN; | |
116 static void verify() PRODUCT_RETURN; | |
117 static int verify_objmon_isinpool(ObjectMonitor *addr) PRODUCT_RETURN0; | |
118 | |
1878 | 119 static void RegisterSpinCallback (int (*)(intptr_t, int), intptr_t) ; |
120 | |
0 | 121 private: |
122 enum { _BLOCKSIZE = 128 }; | |
123 static ObjectMonitor* gBlockList; | |
124 static ObjectMonitor * volatile gFreeList; | |
1640
bfc89697cccb
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
1589
diff
changeset
|
125 static ObjectMonitor * volatile gOmInUseList; // for moribund thread, so monitors they inflated still get scanned |
bfc89697cccb
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
1589
diff
changeset
|
126 static int gOmInUseCount; |
0 | 127 |
128 }; | |
129 | |
130 // ObjectLocker enforced balanced locking and can never thrown an | |
131 // IllegalMonitorStateException. However, a pending exception may | |
132 // have to pass through, and we must also be able to deal with | |
133 // asynchronous exceptions. The caller is responsible for checking | |
134 // the threads pending exception if needed. | |
135 // doLock was added to support classloading with UnsyncloadClass which | |
136 // requires flag based choice of locking the classloader lock. | |
137 class ObjectLocker : public StackObj { | |
138 private: | |
139 Thread* _thread; | |
140 Handle _obj; | |
141 BasicLock _lock; | |
142 bool _dolock; // default true | |
143 public: | |
144 ObjectLocker(Handle obj, Thread* thread, bool doLock = true); | |
145 ~ObjectLocker(); | |
146 | |
147 // Monitor behavior | |
148 void wait (TRAPS) { ObjectSynchronizer::wait (_obj, 0, CHECK); } // wait forever | |
149 void notify_all(TRAPS) { ObjectSynchronizer::notifyall(_obj, CHECK); } | |
150 void waitUninterruptibly (TRAPS) { ObjectSynchronizer::waitUninterruptibly (_obj, 0, CHECK);} | |
151 // complete_exit gives up lock completely, returning recursion count | |
152 // reenter reclaims lock with original recursion count | |
153 intptr_t complete_exit(TRAPS) { return ObjectSynchronizer::complete_exit(_obj, CHECK_0); } | |
154 void reenter(intptr_t recursion, TRAPS) { ObjectSynchronizer::reenter(_obj, recursion, CHECK); } | |
155 }; |