Mercurial > hg > truffle
annotate src/share/vm/runtime/synchronizer.hpp @ 4155:394404b2d9bd
Removed strict requirement for GRAAL environment variable. It only needs to be set now if the graal directory is not in the directory hierarchy of GraalVM JDK.
| author | Doug Simon <doug.simon@oracle.com> |
|---|---|
| date | Wed, 21 Dec 2011 11:25:27 +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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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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 | |
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87 // static void verifyInUse (Thread * Self) ; too slow for general assert/debug |
| 0 | 88 static ObjectMonitor * omAlloc (Thread * Self) ; |
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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(); | |
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116 static int walk_monitor_list(ObjectMonitor** listheadp, |
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117 ObjectMonitor** FreeHeadp, |
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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; | |
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134 static ObjectMonitor * volatile gOmInUseList; // for moribund thread, so monitors they inflated still get scanned |
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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 |