Mercurial > hg > truffle
annotate src/share/vm/runtime/synchronizer.hpp @ 4128:f1391adc6681
7112034: Parallel CMS fails to properly mark reference objects
Summary: Enabled reference processing when work stealing during concurrent marking
Reviewed-by: jmasa, brutisso
author | stefank |
---|---|
date | Mon, 28 Nov 2011 10:19:26 +0100 |
parents | f95d63e2154a |
children | cc32ccaaf47f |
rev | line source |
---|---|
0 | 1 /* |
1972 | 2 * Copyright (c) 1998, 2010, 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 | |
1972 | 25 #ifndef SHARE_VM_RUNTIME_SYNCHRONIZER_HPP |
26 #define SHARE_VM_RUNTIME_SYNCHRONIZER_HPP | |
27 | |
28 #include "oops/markOop.hpp" | |
29 #include "runtime/basicLock.hpp" | |
30 #include "runtime/handles.hpp" | |
31 #include "runtime/perfData.hpp" | |
32 #include "utilities/top.hpp" | |
33 | |
0 | 34 |
35 class ObjectMonitor; | |
36 | |
37 class ObjectSynchronizer : AllStatic { | |
38 friend class VMStructs; | |
39 public: | |
40 typedef enum { | |
41 owner_self, | |
42 owner_none, | |
43 owner_other | |
44 } LockOwnership; | |
45 // exit must be implemented non-blocking, since the compiler cannot easily handle | |
46 // deoptimization at monitor exit. Hence, it does not take a Handle argument. | |
47 | |
48 // This is full version of monitor enter and exit. I choose not | |
49 // to use enter() and exit() in order to make sure user be ware | |
50 // of the performance and semantics difference. They are normally | |
51 // used by ObjectLocker etc. The interpreter and compiler use | |
52 // assembly copies of these routines. Please keep them synchornized. | |
53 // | |
54 // attempt_rebias flag is used by UseBiasedLocking implementation | |
55 static void fast_enter (Handle obj, BasicLock* lock, bool attempt_rebias, TRAPS); | |
56 static void fast_exit (oop obj, BasicLock* lock, Thread* THREAD); | |
57 | |
58 // WARNING: They are ONLY used to handle the slow cases. They should | |
59 // only be used when the fast cases failed. Use of these functions | |
60 // without previous fast case check may cause fatal error. | |
61 static void slow_enter (Handle obj, BasicLock* lock, TRAPS); | |
62 static void slow_exit (oop obj, BasicLock* lock, Thread* THREAD); | |
63 | |
64 // Used only to handle jni locks or other unmatched monitor enter/exit | |
65 // Internally they will use heavy weight monitor. | |
66 static void jni_enter (Handle obj, TRAPS); | |
67 static bool jni_try_enter(Handle obj, Thread* THREAD); // Implements Unsafe.tryMonitorEnter | |
68 static void jni_exit (oop obj, Thread* THREAD); | |
69 | |
70 // Handle all interpreter, compiler and jni cases | |
71 static void wait (Handle obj, jlong millis, TRAPS); | |
72 static void notify (Handle obj, TRAPS); | |
73 static void notifyall (Handle obj, TRAPS); | |
74 | |
75 // Special internal-use-only method for use by JVM infrastructure | |
76 // that needs to wait() on a java-level object but that can't risk | |
77 // throwing unexpected InterruptedExecutionExceptions. | |
78 static void waitUninterruptibly (Handle obj, jlong Millis, Thread * THREAD) ; | |
79 | |
80 // used by classloading to free classloader object lock, | |
81 // wait on an internal lock, and reclaim original lock | |
82 // with original recursion count | |
83 static intptr_t complete_exit (Handle obj, TRAPS); | |
84 static void reenter (Handle obj, intptr_t recursion, TRAPS); | |
85 | |
86 // thread-specific and global objectMonitor free list accessors | |
1640
bfc89697cccb
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
1589
diff
changeset
|
87 // static void verifyInUse (Thread * Self) ; too slow for general assert/debug |
0 | 88 static ObjectMonitor * omAlloc (Thread * Self) ; |
1640
bfc89697cccb
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
1589
diff
changeset
|
89 static void omRelease (Thread * Self, ObjectMonitor * m, bool FromPerThreadAlloc) ; |
0 | 90 static void omFlush (Thread * Self) ; |
91 | |
92 // Inflate light weight monitor to heavy weight monitor | |
93 static ObjectMonitor* inflate(Thread * Self, oop obj); | |
94 // This version is only for internal use | |
95 static ObjectMonitor* inflate_helper(oop obj); | |
96 | |
97 // Returns the identity hash value for an oop | |
98 // NOTE: It may cause monitor inflation | |
99 static intptr_t identity_hash_value_for(Handle obj); | |
100 static intptr_t FastHashCode (Thread * Self, oop obj) ; | |
101 | |
102 // java.lang.Thread support | |
103 static bool current_thread_holds_lock(JavaThread* thread, Handle h_obj); | |
104 static LockOwnership query_lock_ownership(JavaThread * self, Handle h_obj); | |
105 | |
106 static JavaThread* get_lock_owner(Handle h_obj, bool doLock); | |
107 | |
108 // JNI detach support | |
109 static void release_monitors_owned_by_thread(TRAPS); | |
110 static void monitors_iterate(MonitorClosure* m); | |
111 | |
112 // GC: we current use aggressive monitor deflation policy | |
113 // Basically we deflate all monitors that are not busy. | |
114 // An adaptive profile-based deflation policy could be used if needed | |
115 static void deflate_idle_monitors(); | |
1640
bfc89697cccb
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
1589
diff
changeset
|
116 static int walk_monitor_list(ObjectMonitor** listheadp, |
bfc89697cccb
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
1589
diff
changeset
|
117 ObjectMonitor** FreeHeadp, |
bfc89697cccb
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
1589
diff
changeset
|
118 ObjectMonitor** FreeTailp); |
1587 | 119 static bool deflate_monitor(ObjectMonitor* mid, oop obj, ObjectMonitor** FreeHeadp, |
120 ObjectMonitor** FreeTailp); | |
0 | 121 static void oops_do(OopClosure* f); |
122 | |
123 // debugging | |
124 static void trace_locking(Handle obj, bool is_compiled, bool is_method, bool is_locking) PRODUCT_RETURN; | |
125 static void verify() PRODUCT_RETURN; | |
126 static int verify_objmon_isinpool(ObjectMonitor *addr) PRODUCT_RETURN0; | |
127 | |
1878 | 128 static void RegisterSpinCallback (int (*)(intptr_t, int), intptr_t) ; |
129 | |
0 | 130 private: |
131 enum { _BLOCKSIZE = 128 }; | |
132 static ObjectMonitor* gBlockList; | |
133 static ObjectMonitor * volatile gFreeList; | |
1640
bfc89697cccb
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
1589
diff
changeset
|
134 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
|
135 static int gOmInUseCount; |
0 | 136 |
137 }; | |
138 | |
139 // ObjectLocker enforced balanced locking and can never thrown an | |
140 // IllegalMonitorStateException. However, a pending exception may | |
141 // have to pass through, and we must also be able to deal with | |
142 // asynchronous exceptions. The caller is responsible for checking | |
143 // the threads pending exception if needed. | |
144 // doLock was added to support classloading with UnsyncloadClass which | |
145 // requires flag based choice of locking the classloader lock. | |
146 class ObjectLocker : public StackObj { | |
147 private: | |
148 Thread* _thread; | |
149 Handle _obj; | |
150 BasicLock _lock; | |
151 bool _dolock; // default true | |
152 public: | |
153 ObjectLocker(Handle obj, Thread* thread, bool doLock = true); | |
154 ~ObjectLocker(); | |
155 | |
156 // Monitor behavior | |
157 void wait (TRAPS) { ObjectSynchronizer::wait (_obj, 0, CHECK); } // wait forever | |
158 void notify_all(TRAPS) { ObjectSynchronizer::notifyall(_obj, CHECK); } | |
159 void waitUninterruptibly (TRAPS) { ObjectSynchronizer::waitUninterruptibly (_obj, 0, CHECK);} | |
160 // complete_exit gives up lock completely, returning recursion count | |
161 // reenter reclaims lock with original recursion count | |
162 intptr_t complete_exit(TRAPS) { return ObjectSynchronizer::complete_exit(_obj, CHECK_0); } | |
163 void reenter(intptr_t recursion, TRAPS) { ObjectSynchronizer::reenter(_obj, recursion, CHECK); } | |
164 }; | |
1972 | 165 |
166 #endif // SHARE_VM_RUNTIME_SYNCHRONIZER_HPP |