Mercurial > hg > graal-compiler

annotate src/share/vm/memory/gcLocker.cpp @ 18041:52b4284cb496

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Merge with jdk8u20-b26
author Gilles Duboscq <duboscq@ssw.jku.at>
date Wed, 15 Oct 2014 16:02:50 +0200
parents 89152779163c 78bbf4d43a14
children 7848fc12602b
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1 /*
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2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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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.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26 #include "memory/gcLocker.inline.hpp"
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27 #include "memory/resourceArea.hpp"
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28 #include "memory/sharedHeap.hpp"
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29
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30 volatile jint GC_locker::_jni_lock_count = 0;
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31 volatile bool GC_locker::_needs_gc = false;
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32 volatile bool GC_locker::_doing_gc = false;
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33
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34 #ifdef ASSERT
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35 volatile jint GC_locker::_debug_jni_lock_count = 0;
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36 #endif
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37
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38
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39 #ifdef ASSERT
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40 void GC_locker::verify_critical_count() {
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41 if (SafepointSynchronize::is_at_safepoint()) {
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42 assert(!needs_gc() || _debug_jni_lock_count == _jni_lock_count, "must agree");
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43 int count = 0;
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44 // Count the number of threads with critical operations in progress
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45 for (JavaThread* thr = Threads::first(); thr; thr = thr->next()) {
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46 if (thr->in_critical()) {
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47 count++;
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48 }
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49 }
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50 if (_jni_lock_count != count) {
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51 tty->print_cr("critical counts don't match: %d != %d", _jni_lock_count, count);
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52 for (JavaThread* thr = Threads::first(); thr; thr = thr->next()) {
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53 if (thr->in_critical()) {
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54 tty->print_cr(INTPTR_FORMAT " in_critical %d", p2i(thr), thr->in_critical());
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55 }
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56 }
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57 }
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58 assert(_jni_lock_count == count, "must be equal");
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59 }
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60 }
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61 #endif
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62
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63 bool GC_locker::check_active_before_gc() {
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64 assert(SafepointSynchronize::is_at_safepoint(), "only read at safepoint");
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65 if (is_active() && !_needs_gc) {
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66 verify_critical_count();
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67 _needs_gc = true;
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68 if (PrintJNIGCStalls && PrintGCDetails) {
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69 ResourceMark rm; // JavaThread::name() allocates to convert to UTF8
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70 gclog_or_tty->print_cr("%.3f: Setting _needs_gc. Thread \"%s\" %d locked.",
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71 gclog_or_tty->time_stamp().seconds(), Thread::current()->name(), _jni_lock_count);
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72 }
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73
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74 }
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75 return is_active();
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76 }
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77
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78 void GC_locker::stall_until_clear() {
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79 assert(!JavaThread::current()->in_critical(), "Would deadlock");
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80 MutexLocker ml(JNICritical_lock);
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81
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82 if (needs_gc()) {
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83 if (PrintJNIGCStalls && PrintGCDetails) {
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84 ResourceMark rm; // JavaThread::name() allocates to convert to UTF8
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85 gclog_or_tty->print_cr("%.3f: Allocation failed. Thread \"%s\" is stalled by JNI critical section, %d locked.",
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86 gclog_or_tty->time_stamp().seconds(), Thread::current()->name(), _jni_lock_count);
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87 }
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88 }
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89
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90 // Wait for _needs_gc to be cleared
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91 while (needs_gc()) {
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92 JNICritical_lock->wait();
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93 }
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94 }
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95
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96 void GC_locker::jni_lock(JavaThread* thread) {
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97 assert(!thread->in_critical(), "shouldn't currently be in a critical region");
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98 MutexLocker mu(JNICritical_lock);
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99 // Block entering threads if we know at least one thread is in a
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100 // JNI critical region and we need a GC.
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101 // We check that at least one thread is in a critical region before
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102 // blocking because blocked threads are woken up by a thread exiting
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103 // a JNI critical region.
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104 while (is_active_and_needs_gc() || _doing_gc) {
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105 JNICritical_lock->wait();
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106 }
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107 thread->enter_critical();
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108 _jni_lock_count++;
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109 increment_debug_jni_lock_count();
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110 }
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111
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112 void GC_locker::jni_unlock(JavaThread* thread) {
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113 assert(thread->in_last_critical(), "should be exiting critical region");
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114 MutexLocker mu(JNICritical_lock);
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115 _jni_lock_count--;
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116 decrement_debug_jni_lock_count();
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117 thread->exit_critical();
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118 if (needs_gc() && !is_active_internal()) {
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119 // We're the last thread out. Cause a GC to occur.
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120 _doing_gc = true;
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121 {
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122 // Must give up the lock while at a safepoint
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123 MutexUnlocker munlock(JNICritical_lock);
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124 if (PrintJNIGCStalls && PrintGCDetails) {
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125 ResourceMark rm; // JavaThread::name() allocates to convert to UTF8
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126 gclog_or_tty->print_cr("%.3f: Thread \"%s\" is performing GC after exiting critical section, %d locked",
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127 gclog_or_tty->time_stamp().seconds(), Thread::current()->name(), _jni_lock_count);
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128 }
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129 Universe::heap()->collect(GCCause::_gc_locker);
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130 }
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131 _doing_gc = false;
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132 _needs_gc = false;
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133 JNICritical_lock->notify_all();
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134 }
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135 }
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136
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137 // Implementation of No_GC_Verifier
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138
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139 #ifdef ASSERT
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140
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141 No_GC_Verifier::No_GC_Verifier(bool verifygc) {
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142 _verifygc = verifygc;
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143 if (_verifygc) {
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144 CollectedHeap* h = Universe::heap();
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145 assert(!h->is_gc_active(), "GC active during No_GC_Verifier");
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146 _old_invocations = h->total_collections();
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147 }
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148 }
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149
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150
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151 No_GC_Verifier::~No_GC_Verifier() {
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152 if (_verifygc) {
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153 CollectedHeap* h = Universe::heap();
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154 assert(!h->is_gc_active(), "GC active during No_GC_Verifier");
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155 if (_old_invocations != h->total_collections()) {
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156 fatal("collection in a No_GC_Verifier secured function");
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157 }
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158 }
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159 }
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160
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161 Pause_No_GC_Verifier::Pause_No_GC_Verifier(No_GC_Verifier * ngcv) {
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162 _ngcv = ngcv;
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163 if (_ngcv->_verifygc) {
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164 // if we were verifying, then make sure that nothing is
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165 // wrong before we "pause" verification
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166 CollectedHeap* h = Universe::heap();
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167 assert(!h->is_gc_active(), "GC active during No_GC_Verifier");
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168 if (_ngcv->_old_invocations != h->total_collections()) {
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169 fatal("collection in a No_GC_Verifier secured function");
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170 }
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171 }
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172 }
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173
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174
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175 Pause_No_GC_Verifier::~Pause_No_GC_Verifier() {
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176 if (_ngcv->_verifygc) {
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177 // if we were verifying before, then reenable verification
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178 CollectedHeap* h = Universe::heap();
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179 assert(!h->is_gc_active(), "GC active during No_GC_Verifier");
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180 _ngcv->_old_invocations = h->total_collections();
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181 }
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182 }
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183
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184
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185 // JRT_LEAF rules:
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186 // A JRT_LEAF method may not interfere with safepointing by
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187 // 1) acquiring or blocking on a Mutex or JavaLock - checked
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188 // 2) allocating heap memory - checked
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189 // 3) executing a VM operation - checked
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190 // 4) executing a system call (including malloc) that could block or grab a lock
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191 // 5) invoking GC
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192 // 6) reaching a safepoint
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193 // 7) running too long
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194 // Nor may any method it calls.
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195 JRT_Leaf_Verifier::JRT_Leaf_Verifier()
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196 : No_Safepoint_Verifier(true, JRT_Leaf_Verifier::should_verify_GC())
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197 {
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198 }
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199
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200 JRT_Leaf_Verifier::~JRT_Leaf_Verifier()
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201 {
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202 }
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203
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204 bool JRT_Leaf_Verifier::should_verify_GC() {
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205 switch (JavaThread::current()->thread_state()) {
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206 case _thread_in_Java:
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207 // is in a leaf routine, there must be no safepoint.
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208 return true;
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209 case _thread_in_native:
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210 // A native thread is not subject to safepoints.
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211 // Even while it is in a leaf routine, GC is ok
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212 return false;
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213 default:
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214 // Leaf routines cannot be called from other contexts.
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215 ShouldNotReachHere();
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216 return false;
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217 }
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218 }
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219 #endif