Mercurial > hg > truffle
annotate src/share/vm/memory/gcLocker.cpp @ 20261:27188ae8bbbb
8035648: Don't use Handle in java_lang_String::print
Reviewed-by: coleenp, pliden
author | stefank |
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date | Thu, 27 Feb 2014 10:34:55 +0100 |
parents | ce8f6bb717c9 |
children | 7848fc12602b |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2014, 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" | |
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29 #include "runtime/thread.inline.hpp" |
0 | 30 |
31 volatile jint GC_locker::_jni_lock_count = 0; | |
32 volatile bool GC_locker::_needs_gc = false; | |
33 volatile bool GC_locker::_doing_gc = false; | |
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34 |
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35 #ifdef ASSERT |
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36 volatile jint GC_locker::_debug_jni_lock_count = 0; |
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37 #endif |
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38 |
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39 |
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40 #ifdef ASSERT |
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41 void GC_locker::verify_critical_count() { |
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42 if (SafepointSynchronize::is_at_safepoint()) { |
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43 assert(!needs_gc() || _debug_jni_lock_count == _jni_lock_count, "must agree"); |
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44 int count = 0; |
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45 // Count the number of threads with critical operations in progress |
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46 for (JavaThread* thr = Threads::first(); thr; thr = thr->next()) { |
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47 if (thr->in_critical()) { |
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48 count++; |
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49 } |
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50 } |
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51 if (_jni_lock_count != count) { |
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52 tty->print_cr("critical counts don't match: %d != %d", _jni_lock_count, count); |
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53 for (JavaThread* thr = Threads::first(); thr; thr = thr->next()) { |
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54 if (thr->in_critical()) { |
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55 tty->print_cr(INTPTR_FORMAT " in_critical %d", p2i(thr), thr->in_critical()); |
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56 } |
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57 } |
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58 } |
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59 assert(_jni_lock_count == count, "must be equal"); |
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60 } |
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61 } |
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62 #endif |
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63 |
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64 bool GC_locker::check_active_before_gc() { |
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65 assert(SafepointSynchronize::is_at_safepoint(), "only read at safepoint"); |
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66 if (is_active() && !_needs_gc) { |
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67 verify_critical_count(); |
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68 _needs_gc = true; |
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69 if (PrintJNIGCStalls && PrintGCDetails) { |
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70 ResourceMark rm; // JavaThread::name() allocates to convert to UTF8 |
4944 | 71 gclog_or_tty->print_cr("%.3f: Setting _needs_gc. Thread \"%s\" %d locked.", |
72 gclog_or_tty->time_stamp().seconds(), Thread::current()->name(), _jni_lock_count); | |
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73 } |
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74 |
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75 } |
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76 return is_active(); |
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77 } |
0 | 78 |
79 void GC_locker::stall_until_clear() { | |
80 assert(!JavaThread::current()->in_critical(), "Would deadlock"); | |
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81 MutexLocker ml(JNICritical_lock); |
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82 |
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83 if (needs_gc()) { |
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84 if (PrintJNIGCStalls && PrintGCDetails) { |
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85 ResourceMark rm; // JavaThread::name() allocates to convert to UTF8 |
4944 | 86 gclog_or_tty->print_cr("%.3f: Allocation failed. Thread \"%s\" is stalled by JNI critical section, %d locked.", |
87 gclog_or_tty->time_stamp().seconds(), Thread::current()->name(), _jni_lock_count); | |
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88 } |
139
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89 } |
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90 |
0 | 91 // Wait for _needs_gc to be cleared |
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92 while (needs_gc()) { |
0 | 93 JNICritical_lock->wait(); |
94 } | |
95 } | |
96 | |
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97 void GC_locker::jni_lock(JavaThread* thread) { |
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98 assert(!thread->in_critical(), "shouldn't currently be in a critical region"); |
0 | 99 MutexLocker mu(JNICritical_lock); |
100 // Block entering threads if we know at least one thread is in a | |
101 // JNI critical region and we need a GC. | |
102 // We check that at least one thread is in a critical region before | |
103 // blocking because blocked threads are woken up by a thread exiting | |
104 // a JNI critical region. | |
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105 while (is_active_and_needs_gc() || _doing_gc) { |
0 | 106 JNICritical_lock->wait(); |
107 } | |
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108 thread->enter_critical(); |
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109 _jni_lock_count++; |
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110 increment_debug_jni_lock_count(); |
0 | 111 } |
112 | |
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113 void GC_locker::jni_unlock(JavaThread* thread) { |
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114 assert(thread->in_last_critical(), "should be exiting critical region"); |
0 | 115 MutexLocker mu(JNICritical_lock); |
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116 _jni_lock_count--; |
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117 decrement_debug_jni_lock_count(); |
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118 thread->exit_critical(); |
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119 if (needs_gc() && !is_active_internal()) { |
0 | 120 // We're the last thread out. Cause a GC to occur. |
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121 _doing_gc = true; |
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122 { |
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123 // Must give up the lock while at a safepoint |
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124 MutexUnlocker munlock(JNICritical_lock); |
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125 if (PrintJNIGCStalls && PrintGCDetails) { |
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126 ResourceMark rm; // JavaThread::name() allocates to convert to UTF8 |
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127 gclog_or_tty->print_cr("%.3f: Thread \"%s\" is performing GC after exiting critical section, %d locked", |
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128 gclog_or_tty->time_stamp().seconds(), Thread::current()->name(), _jni_lock_count); |
0 | 129 } |
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130 Universe::heap()->collect(GCCause::_gc_locker); |
0 | 131 } |
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132 _doing_gc = false; |
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133 _needs_gc = false; |
0 | 134 JNICritical_lock->notify_all(); |
135 } | |
136 } | |
137 | |
138 // Implementation of No_GC_Verifier | |
139 | |
140 #ifdef ASSERT | |
141 | |
142 No_GC_Verifier::No_GC_Verifier(bool verifygc) { | |
143 _verifygc = verifygc; | |
144 if (_verifygc) { | |
145 CollectedHeap* h = Universe::heap(); | |
146 assert(!h->is_gc_active(), "GC active during No_GC_Verifier"); | |
147 _old_invocations = h->total_collections(); | |
148 } | |
149 } | |
150 | |
151 | |
152 No_GC_Verifier::~No_GC_Verifier() { | |
153 if (_verifygc) { | |
154 CollectedHeap* h = Universe::heap(); | |
155 assert(!h->is_gc_active(), "GC active during No_GC_Verifier"); | |
156 if (_old_invocations != h->total_collections()) { | |
157 fatal("collection in a No_GC_Verifier secured function"); | |
158 } | |
159 } | |
160 } | |
161 | |
162 Pause_No_GC_Verifier::Pause_No_GC_Verifier(No_GC_Verifier * ngcv) { | |
163 _ngcv = ngcv; | |
164 if (_ngcv->_verifygc) { | |
165 // if we were verifying, then make sure that nothing is | |
166 // wrong before we "pause" verification | |
167 CollectedHeap* h = Universe::heap(); | |
168 assert(!h->is_gc_active(), "GC active during No_GC_Verifier"); | |
169 if (_ngcv->_old_invocations != h->total_collections()) { | |
170 fatal("collection in a No_GC_Verifier secured function"); | |
171 } | |
172 } | |
173 } | |
174 | |
175 | |
176 Pause_No_GC_Verifier::~Pause_No_GC_Verifier() { | |
177 if (_ngcv->_verifygc) { | |
178 // if we were verifying before, then reenable verification | |
179 CollectedHeap* h = Universe::heap(); | |
180 assert(!h->is_gc_active(), "GC active during No_GC_Verifier"); | |
181 _ngcv->_old_invocations = h->total_collections(); | |
182 } | |
183 } | |
184 | |
185 | |
186 // JRT_LEAF rules: | |
187 // A JRT_LEAF method may not interfere with safepointing by | |
188 // 1) acquiring or blocking on a Mutex or JavaLock - checked | |
189 // 2) allocating heap memory - checked | |
190 // 3) executing a VM operation - checked | |
191 // 4) executing a system call (including malloc) that could block or grab a lock | |
192 // 5) invoking GC | |
193 // 6) reaching a safepoint | |
194 // 7) running too long | |
195 // Nor may any method it calls. | |
196 JRT_Leaf_Verifier::JRT_Leaf_Verifier() | |
197 : No_Safepoint_Verifier(true, JRT_Leaf_Verifier::should_verify_GC()) | |
198 { | |
199 } | |
200 | |
201 JRT_Leaf_Verifier::~JRT_Leaf_Verifier() | |
202 { | |
203 } | |
204 | |
205 bool JRT_Leaf_Verifier::should_verify_GC() { | |
206 switch (JavaThread::current()->thread_state()) { | |
207 case _thread_in_Java: | |
208 // is in a leaf routine, there must be no safepoint. | |
209 return true; | |
210 case _thread_in_native: | |
211 // A native thread is not subject to safepoints. | |
212 // Even while it is in a leaf routine, GC is ok | |
213 return false; | |
214 default: | |
215 // Leaf routines cannot be called from other contexts. | |
216 ShouldNotReachHere(); | |
217 return false; | |
218 } | |
219 } | |
220 #endif |