Mercurial > hg > truffle
annotate src/share/vm/memory/gcLocker.cpp @ 192:6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
Summary: Poke String.stringCacheEnabled during vm initialization
Reviewed-by: never
author | kvn |
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date | Fri, 13 Jun 2008 14:49:07 -0700 |
parents | c0492d52d55b |
children | d1605aabd0a1 |
rev | line source |
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0 | 1 /* |
2 * Copyright 1997-2007 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 # include "incls/_precompiled.incl" | |
26 # include "incls/_gcLocker.cpp.incl" | |
27 | |
28 volatile jint GC_locker::_jni_lock_count = 0; | |
29 volatile jint GC_locker::_lock_count = 0; | |
30 volatile bool GC_locker::_needs_gc = false; | |
31 volatile bool GC_locker::_doing_gc = false; | |
32 | |
33 void GC_locker::stall_until_clear() { | |
34 assert(!JavaThread::current()->in_critical(), "Would deadlock"); | |
139
c0492d52d55b
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
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35 if (PrintJNIGCStalls && PrintGCDetails) { |
c0492d52d55b
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
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36 ResourceMark rm; // JavaThread::name() allocates to convert to UTF8 |
c0492d52d55b
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
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37 gclog_or_tty->print_cr( |
c0492d52d55b
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
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38 "Allocation failed. Thread \"%s\" is stalled by JNI critical section.", |
c0492d52d55b
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
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39 JavaThread::current()->name()); |
c0492d52d55b
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
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40 } |
0 | 41 MutexLocker ml(JNICritical_lock); |
42 // Wait for _needs_gc to be cleared | |
43 while (GC_locker::needs_gc()) { | |
44 JNICritical_lock->wait(); | |
45 } | |
46 } | |
47 | |
48 void GC_locker::jni_lock_slow() { | |
49 MutexLocker mu(JNICritical_lock); | |
50 // Block entering threads if we know at least one thread is in a | |
51 // JNI critical region and we need a GC. | |
52 // We check that at least one thread is in a critical region before | |
53 // blocking because blocked threads are woken up by a thread exiting | |
54 // a JNI critical region. | |
55 while ((is_jni_active() && needs_gc()) || _doing_gc) { | |
56 JNICritical_lock->wait(); | |
57 } | |
58 jni_lock(); | |
59 } | |
60 | |
61 void GC_locker::jni_unlock_slow() { | |
62 MutexLocker mu(JNICritical_lock); | |
63 jni_unlock(); | |
64 if (needs_gc() && !is_jni_active()) { | |
65 // We're the last thread out. Cause a GC to occur. | |
66 // GC will also check is_active, so this check is not | |
67 // strictly needed. It's added here to make it clear that | |
68 // the GC will NOT be performed if any other caller | |
69 // of GC_locker::lock() still needs GC locked. | |
70 if (!is_active()) { | |
71 _doing_gc = true; | |
72 { | |
73 // Must give up the lock while at a safepoint | |
74 MutexUnlocker munlock(JNICritical_lock); | |
75 Universe::heap()->collect(GCCause::_gc_locker); | |
76 } | |
77 _doing_gc = false; | |
78 } | |
79 clear_needs_gc(); | |
80 JNICritical_lock->notify_all(); | |
81 } | |
82 } | |
83 | |
84 // Implementation of No_GC_Verifier | |
85 | |
86 #ifdef ASSERT | |
87 | |
88 No_GC_Verifier::No_GC_Verifier(bool verifygc) { | |
89 _verifygc = verifygc; | |
90 if (_verifygc) { | |
91 CollectedHeap* h = Universe::heap(); | |
92 assert(!h->is_gc_active(), "GC active during No_GC_Verifier"); | |
93 _old_invocations = h->total_collections(); | |
94 } | |
95 } | |
96 | |
97 | |
98 No_GC_Verifier::~No_GC_Verifier() { | |
99 if (_verifygc) { | |
100 CollectedHeap* h = Universe::heap(); | |
101 assert(!h->is_gc_active(), "GC active during No_GC_Verifier"); | |
102 if (_old_invocations != h->total_collections()) { | |
103 fatal("collection in a No_GC_Verifier secured function"); | |
104 } | |
105 } | |
106 } | |
107 | |
108 Pause_No_GC_Verifier::Pause_No_GC_Verifier(No_GC_Verifier * ngcv) { | |
109 _ngcv = ngcv; | |
110 if (_ngcv->_verifygc) { | |
111 // if we were verifying, then make sure that nothing is | |
112 // wrong before we "pause" verification | |
113 CollectedHeap* h = Universe::heap(); | |
114 assert(!h->is_gc_active(), "GC active during No_GC_Verifier"); | |
115 if (_ngcv->_old_invocations != h->total_collections()) { | |
116 fatal("collection in a No_GC_Verifier secured function"); | |
117 } | |
118 } | |
119 } | |
120 | |
121 | |
122 Pause_No_GC_Verifier::~Pause_No_GC_Verifier() { | |
123 if (_ngcv->_verifygc) { | |
124 // if we were verifying before, then reenable verification | |
125 CollectedHeap* h = Universe::heap(); | |
126 assert(!h->is_gc_active(), "GC active during No_GC_Verifier"); | |
127 _ngcv->_old_invocations = h->total_collections(); | |
128 } | |
129 } | |
130 | |
131 | |
132 // JRT_LEAF rules: | |
133 // A JRT_LEAF method may not interfere with safepointing by | |
134 // 1) acquiring or blocking on a Mutex or JavaLock - checked | |
135 // 2) allocating heap memory - checked | |
136 // 3) executing a VM operation - checked | |
137 // 4) executing a system call (including malloc) that could block or grab a lock | |
138 // 5) invoking GC | |
139 // 6) reaching a safepoint | |
140 // 7) running too long | |
141 // Nor may any method it calls. | |
142 JRT_Leaf_Verifier::JRT_Leaf_Verifier() | |
143 : No_Safepoint_Verifier(true, JRT_Leaf_Verifier::should_verify_GC()) | |
144 { | |
145 } | |
146 | |
147 JRT_Leaf_Verifier::~JRT_Leaf_Verifier() | |
148 { | |
149 } | |
150 | |
151 bool JRT_Leaf_Verifier::should_verify_GC() { | |
152 switch (JavaThread::current()->thread_state()) { | |
153 case _thread_in_Java: | |
154 // is in a leaf routine, there must be no safepoint. | |
155 return true; | |
156 case _thread_in_native: | |
157 // A native thread is not subject to safepoints. | |
158 // Even while it is in a leaf routine, GC is ok | |
159 return false; | |
160 default: | |
161 // Leaf routines cannot be called from other contexts. | |
162 ShouldNotReachHere(); | |
163 return false; | |
164 } | |
165 } | |
166 #endif |