Mercurial > hg > truffle
annotate src/share/vm/memory/gcLocker.cpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
| author | stefank |
|---|---|
| date | Tue, 23 Nov 2010 13:22:55 -0800 |
| parents | c18cbe5936b8 |
| children | 1a2723f7ad8e |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 1997, 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 #include "precompiled.hpp" |
| 26 #include "memory/gcLocker.inline.hpp" | |
| 27 #include "memory/resourceArea.hpp" | |
| 28 #include "memory/sharedHeap.hpp" | |
| 0 | 29 |
| 30 volatile jint GC_locker::_jni_lock_count = 0; | |
| 31 volatile jint GC_locker::_lock_count = 0; | |
| 32 volatile bool GC_locker::_needs_gc = false; | |
| 33 volatile bool GC_locker::_doing_gc = false; | |
| 34 | |
| 35 void GC_locker::stall_until_clear() { | |
| 36 assert(!JavaThread::current()->in_critical(), "Would deadlock"); | |
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37 if (PrintJNIGCStalls && PrintGCDetails) { |
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38 ResourceMark rm; // JavaThread::name() allocates to convert to UTF8 |
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39 gclog_or_tty->print_cr( |
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40 "Allocation failed. Thread \"%s\" is stalled by JNI critical section.", |
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41 JavaThread::current()->name()); |
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42 } |
| 0 | 43 MutexLocker ml(JNICritical_lock); |
| 44 // Wait for _needs_gc to be cleared | |
| 45 while (GC_locker::needs_gc()) { | |
| 46 JNICritical_lock->wait(); | |
| 47 } | |
| 48 } | |
| 49 | |
| 50 void GC_locker::jni_lock_slow() { | |
| 51 MutexLocker mu(JNICritical_lock); | |
| 52 // Block entering threads if we know at least one thread is in a | |
| 53 // JNI critical region and we need a GC. | |
| 54 // We check that at least one thread is in a critical region before | |
| 55 // blocking because blocked threads are woken up by a thread exiting | |
| 56 // a JNI critical region. | |
| 57 while ((is_jni_active() && needs_gc()) || _doing_gc) { | |
| 58 JNICritical_lock->wait(); | |
| 59 } | |
| 60 jni_lock(); | |
| 61 } | |
| 62 | |
| 63 void GC_locker::jni_unlock_slow() { | |
| 64 MutexLocker mu(JNICritical_lock); | |
| 65 jni_unlock(); | |
| 66 if (needs_gc() && !is_jni_active()) { | |
| 67 // We're the last thread out. Cause a GC to occur. | |
| 68 // GC will also check is_active, so this check is not | |
| 69 // strictly needed. It's added here to make it clear that | |
| 70 // the GC will NOT be performed if any other caller | |
| 71 // of GC_locker::lock() still needs GC locked. | |
| 72 if (!is_active()) { | |
| 73 _doing_gc = true; | |
| 74 { | |
| 75 // Must give up the lock while at a safepoint | |
| 76 MutexUnlocker munlock(JNICritical_lock); | |
| 77 Universe::heap()->collect(GCCause::_gc_locker); | |
| 78 } | |
| 79 _doing_gc = false; | |
| 80 } | |
| 81 clear_needs_gc(); | |
| 82 JNICritical_lock->notify_all(); | |
| 83 } | |
| 84 } | |
| 85 | |
| 86 // Implementation of No_GC_Verifier | |
| 87 | |
| 88 #ifdef ASSERT | |
| 89 | |
| 90 No_GC_Verifier::No_GC_Verifier(bool verifygc) { | |
| 91 _verifygc = verifygc; | |
| 92 if (_verifygc) { | |
| 93 CollectedHeap* h = Universe::heap(); | |
| 94 assert(!h->is_gc_active(), "GC active during No_GC_Verifier"); | |
| 95 _old_invocations = h->total_collections(); | |
| 96 } | |
| 97 } | |
| 98 | |
| 99 | |
| 100 No_GC_Verifier::~No_GC_Verifier() { | |
| 101 if (_verifygc) { | |
| 102 CollectedHeap* h = Universe::heap(); | |
| 103 assert(!h->is_gc_active(), "GC active during No_GC_Verifier"); | |
| 104 if (_old_invocations != h->total_collections()) { | |
| 105 fatal("collection in a No_GC_Verifier secured function"); | |
| 106 } | |
| 107 } | |
| 108 } | |
| 109 | |
| 110 Pause_No_GC_Verifier::Pause_No_GC_Verifier(No_GC_Verifier * ngcv) { | |
| 111 _ngcv = ngcv; | |
| 112 if (_ngcv->_verifygc) { | |
| 113 // if we were verifying, then make sure that nothing is | |
| 114 // wrong before we "pause" verification | |
| 115 CollectedHeap* h = Universe::heap(); | |
| 116 assert(!h->is_gc_active(), "GC active during No_GC_Verifier"); | |
| 117 if (_ngcv->_old_invocations != h->total_collections()) { | |
| 118 fatal("collection in a No_GC_Verifier secured function"); | |
| 119 } | |
| 120 } | |
| 121 } | |
| 122 | |
| 123 | |
| 124 Pause_No_GC_Verifier::~Pause_No_GC_Verifier() { | |
| 125 if (_ngcv->_verifygc) { | |
| 126 // if we were verifying before, then reenable verification | |
| 127 CollectedHeap* h = Universe::heap(); | |
| 128 assert(!h->is_gc_active(), "GC active during No_GC_Verifier"); | |
| 129 _ngcv->_old_invocations = h->total_collections(); | |
| 130 } | |
| 131 } | |
| 132 | |
| 133 | |
| 134 // JRT_LEAF rules: | |
| 135 // A JRT_LEAF method may not interfere with safepointing by | |
| 136 // 1) acquiring or blocking on a Mutex or JavaLock - checked | |
| 137 // 2) allocating heap memory - checked | |
| 138 // 3) executing a VM operation - checked | |
| 139 // 4) executing a system call (including malloc) that could block or grab a lock | |
| 140 // 5) invoking GC | |
| 141 // 6) reaching a safepoint | |
| 142 // 7) running too long | |
| 143 // Nor may any method it calls. | |
| 144 JRT_Leaf_Verifier::JRT_Leaf_Verifier() | |
| 145 : No_Safepoint_Verifier(true, JRT_Leaf_Verifier::should_verify_GC()) | |
| 146 { | |
| 147 } | |
| 148 | |
| 149 JRT_Leaf_Verifier::~JRT_Leaf_Verifier() | |
| 150 { | |
| 151 } | |
| 152 | |
| 153 bool JRT_Leaf_Verifier::should_verify_GC() { | |
| 154 switch (JavaThread::current()->thread_state()) { | |
| 155 case _thread_in_Java: | |
| 156 // is in a leaf routine, there must be no safepoint. | |
| 157 return true; | |
| 158 case _thread_in_native: | |
| 159 // A native thread is not subject to safepoints. | |
| 160 // Even while it is in a leaf routine, GC is ok | |
| 161 return false; | |
| 162 default: | |
| 163 // Leaf routines cannot be called from other contexts. | |
| 164 ShouldNotReachHere(); | |
| 165 return false; | |
| 166 } | |
| 167 } | |
| 168 #endif |