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0
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1 /*
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2 * Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 # include "incls/_precompiled.incl"
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26 # include "incls/_vm_operations.cpp.incl"
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27
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28 #define VM_OP_NAME_INITIALIZE(name) #name,
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29
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30 const char* VM_Operation::_names[VM_Operation::VMOp_Terminating] = \
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31 { VM_OPS_DO(VM_OP_NAME_INITIALIZE) };
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32
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33 void VM_Operation::set_calling_thread(Thread* thread, ThreadPriority priority) {
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34 _calling_thread = thread;
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35 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check");
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36 _priority = priority;
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37 }
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38
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39
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40 void VM_Operation::evaluate() {
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41 ResourceMark rm;
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42 if (TraceVMOperation) {
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43 tty->print("[");
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44 NOT_PRODUCT(print();)
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45 }
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46 doit();
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47 if (TraceVMOperation) {
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48 tty->print_cr("]");
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49 }
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50 }
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51
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52 // Called by fatal error handler.
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53 void VM_Operation::print_on_error(outputStream* st) const {
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54 st->print("VM_Operation (" PTR_FORMAT "): ", this);
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55 st->print("%s", name());
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56
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57 const char* mode;
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58 switch(evaluation_mode()) {
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59 case _safepoint : mode = "safepoint"; break;
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60 case _no_safepoint : mode = "no safepoint"; break;
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61 case _concurrent : mode = "concurrent"; break;
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62 case _async_safepoint: mode = "async safepoint"; break;
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63 default : mode = "unknown"; break;
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64 }
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65 st->print(", mode: %s", mode);
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66
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67 if (calling_thread()) {
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68 st->print(", requested by thread " PTR_FORMAT, calling_thread());
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69 }
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70 }
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71
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72 void VM_ThreadStop::doit() {
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73 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
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74 JavaThread* target = java_lang_Thread::thread(target_thread());
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75 // Note that this now allows multiple ThreadDeath exceptions to be
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76 // thrown at a thread.
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77 if (target != NULL) {
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78 // the thread has run and is not already in the process of exiting
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79 target->send_thread_stop(throwable());
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80 }
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81 }
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82
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83 void VM_Deoptimize::doit() {
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84 // We do not want any GCs to happen while we are in the middle of this VM operation
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85 ResourceMark rm;
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86 DeoptimizationMarker dm;
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87
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88 // Deoptimize all activations depending on marked nmethods
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89 Deoptimization::deoptimize_dependents();
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90
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91 // Make the dependent methods zombies
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92 CodeCache::make_marked_nmethods_zombies();
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93 }
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94
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95
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96 VM_DeoptimizeFrame::VM_DeoptimizeFrame(JavaThread* thread, intptr_t* id) {
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97 _thread = thread;
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98 _id = id;
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99 }
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100
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101
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102 void VM_DeoptimizeFrame::doit() {
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103 Deoptimization::deoptimize_frame(_thread, _id);
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104 }
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105
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106
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107 #ifndef PRODUCT
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108
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109 void VM_DeoptimizeAll::doit() {
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110 DeoptimizationMarker dm;
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111 // deoptimize all java threads in the system
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112 if (DeoptimizeALot) {
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113 for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) {
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114 if (thread->has_last_Java_frame()) {
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115 thread->deoptimize();
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116 }
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117 }
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118 } else if (DeoptimizeRandom) {
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119
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120 // Deoptimize some selected threads and frames
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121 int tnum = os::random() & 0x3;
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122 int fnum = os::random() & 0x3;
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123 int tcount = 0;
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124 for (JavaThread* thread = Threads::first(); thread != NULL; thread = thread->next()) {
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125 if (thread->has_last_Java_frame()) {
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126 if (tcount++ == tnum) {
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127 tcount = 0;
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128 int fcount = 0;
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129 // Deoptimize some selected frames.
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130 // Biased llocking wants a updated register map
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131 for(StackFrameStream fst(thread, UseBiasedLocking); !fst.is_done(); fst.next()) {
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132 if (fst.current()->can_be_deoptimized()) {
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133 if (fcount++ == fnum) {
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134 fcount = 0;
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135 Deoptimization::deoptimize(thread, *fst.current(), fst.register_map());
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136 }
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137 }
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138 }
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139 }
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140 }
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141 }
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142 }
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143 }
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144
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145
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146 void VM_ZombieAll::doit() {
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147 JavaThread *thread = (JavaThread *)calling_thread();
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148 assert(thread->is_Java_thread(), "must be a Java thread");
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149 thread->make_zombies();
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150 }
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151
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152 #endif // !PRODUCT
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153
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154 void VM_Verify::doit() {
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155 Universe::verify();
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156 }
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157
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158 bool VM_PrintThreads::doit_prologue() {
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159 assert(Thread::current()->is_Java_thread(), "just checking");
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160
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161 // Make sure AbstractOwnableSynchronizer is loaded
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162 if (JDK_Version::is_gte_jdk16x_version()) {
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163 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current());
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164 }
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165
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166 // Get Heap_lock if concurrent locks will be dumped
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167 if (_print_concurrent_locks) {
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168 Heap_lock->lock();
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169 }
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170 return true;
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171 }
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172
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173 void VM_PrintThreads::doit() {
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174 Threads::print_on(_out, true, false, _print_concurrent_locks);
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175 }
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176
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177 void VM_PrintThreads::doit_epilogue() {
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178 if (_print_concurrent_locks) {
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179 // Release Heap_lock
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180 Heap_lock->unlock();
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181 }
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182 }
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183
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184 void VM_PrintJNI::doit() {
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185 JNIHandles::print_on(_out);
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186 }
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187
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188 VM_FindDeadlocks::~VM_FindDeadlocks() {
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189 if (_deadlocks != NULL) {
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190 DeadlockCycle* cycle = _deadlocks;
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191 while (cycle != NULL) {
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192 DeadlockCycle* d = cycle;
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193 cycle = cycle->next();
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194 delete d;
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195 }
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196 }
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197 }
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198
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199 bool VM_FindDeadlocks::doit_prologue() {
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200 assert(Thread::current()->is_Java_thread(), "just checking");
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201
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202 // Load AbstractOwnableSynchronizer class
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203 if (_concurrent_locks && JDK_Version::is_gte_jdk16x_version()) {
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204 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current());
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205 }
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206
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207 return true;
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208 }
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209
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210 void VM_FindDeadlocks::doit() {
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211 _deadlocks = ThreadService::find_deadlocks_at_safepoint(_concurrent_locks);
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212 if (_out != NULL) {
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213 int num_deadlocks = 0;
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214 for (DeadlockCycle* cycle = _deadlocks; cycle != NULL; cycle = cycle->next()) {
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215 num_deadlocks++;
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216 cycle->print_on(_out);
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217 }
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218
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219 if (num_deadlocks == 1) {
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220 _out->print_cr("\nFound 1 deadlock.\n");
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221 _out->flush();
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222 } else if (num_deadlocks > 1) {
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223 _out->print_cr("\nFound %d deadlocks.\n", num_deadlocks);
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224 _out->flush();
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225 }
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226 }
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227 }
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228
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229 VM_ThreadDump::VM_ThreadDump(ThreadDumpResult* result,
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230 int max_depth,
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231 bool with_locked_monitors,
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232 bool with_locked_synchronizers) {
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233 _result = result;
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234 _num_threads = 0; // 0 indicates all threads
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235 _threads = NULL;
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236 _result = result;
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237 _max_depth = max_depth;
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238 _with_locked_monitors = with_locked_monitors;
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239 _with_locked_synchronizers = with_locked_synchronizers;
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240 }
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241
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242 VM_ThreadDump::VM_ThreadDump(ThreadDumpResult* result,
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243 GrowableArray<instanceHandle>* threads,
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244 int num_threads,
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245 int max_depth,
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246 bool with_locked_monitors,
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247 bool with_locked_synchronizers) {
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248 _result = result;
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249 _num_threads = num_threads;
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250 _threads = threads;
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251 _result = result;
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252 _max_depth = max_depth;
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253 _with_locked_monitors = with_locked_monitors;
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254 _with_locked_synchronizers = with_locked_synchronizers;
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255 }
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256
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257 bool VM_ThreadDump::doit_prologue() {
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258 assert(Thread::current()->is_Java_thread(), "just checking");
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259
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260 // Load AbstractOwnableSynchronizer class before taking thread snapshots
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261 if (JDK_Version::is_gte_jdk16x_version()) {
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262 java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(JavaThread::current());
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263 }
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264
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265 if (_with_locked_synchronizers) {
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266 // Acquire Heap_lock to dump concurrent locks
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267 Heap_lock->lock();
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268 }
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269
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270 return true;
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271 }
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272
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273 void VM_ThreadDump::doit_epilogue() {
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274 if (_with_locked_synchronizers) {
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275 // Release Heap_lock
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276 Heap_lock->unlock();
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277 }
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278 }
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279
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280 void VM_ThreadDump::doit() {
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281 ResourceMark rm;
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282
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283 ConcurrentLocksDump concurrent_locks(true);
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284 if (_with_locked_synchronizers) {
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285 concurrent_locks.dump_at_safepoint();
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286 }
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287
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288 if (_num_threads == 0) {
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289 // Snapshot all live threads
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290 for (JavaThread* jt = Threads::first(); jt != NULL; jt = jt->next()) {
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291 if (jt->is_exiting() ||
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292 jt->is_hidden_from_external_view()) {
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293 // skip terminating threads and hidden threads
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294 continue;
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295 }
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296 ThreadConcurrentLocks* tcl = NULL;
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297 if (_with_locked_synchronizers) {
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298 tcl = concurrent_locks.thread_concurrent_locks(jt);
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299 }
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300 ThreadSnapshot* ts = snapshot_thread(jt, tcl);
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301 _result->add_thread_snapshot(ts);
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302 }
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303 } else {
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304 // Snapshot threads in the given _threads array
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305 // A dummy snapshot is created if a thread doesn't exist
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306 for (int i = 0; i < _num_threads; i++) {
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307 instanceHandle th = _threads->at(i);
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308 if (th() == NULL) {
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309 // skip if the thread doesn't exist
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310 // Add a dummy snapshot
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311 _result->add_thread_snapshot(new ThreadSnapshot());
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312 continue;
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313 }
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314
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315 // Dump thread stack only if the thread is alive and not exiting
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316 // and not VM internal thread.
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317 JavaThread* jt = java_lang_Thread::thread(th());
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318 if (jt == NULL || /* thread not alive */
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319 jt->is_exiting() ||
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320 jt->is_hidden_from_external_view()) {
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321 // add a NULL snapshot if skipped
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322 _result->add_thread_snapshot(new ThreadSnapshot());
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323 continue;
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324 }
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325 ThreadConcurrentLocks* tcl = NULL;
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326 if (_with_locked_synchronizers) {
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327 tcl = concurrent_locks.thread_concurrent_locks(jt);
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328 }
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329 ThreadSnapshot* ts = snapshot_thread(jt, tcl);
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330 _result->add_thread_snapshot(ts);
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331 }
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332 }
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333 }
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334
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335 ThreadSnapshot* VM_ThreadDump::snapshot_thread(JavaThread* java_thread, ThreadConcurrentLocks* tcl) {
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336 ThreadSnapshot* snapshot = new ThreadSnapshot(java_thread);
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337 snapshot->dump_stack_at_safepoint(_max_depth, _with_locked_monitors);
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338 snapshot->set_concurrent_locks(tcl);
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339 return snapshot;
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340 }
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341
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342 volatile bool VM_Exit::_vm_exited = false;
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343 Thread * VM_Exit::_shutdown_thread = NULL;
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344
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345 int VM_Exit::set_vm_exited() {
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346 Thread * thr_cur = ThreadLocalStorage::get_thread_slow();
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347
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348 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint already");
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349
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350 int num_active = 0;
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351
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352 _shutdown_thread = thr_cur;
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353 _vm_exited = true; // global flag
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354 for(JavaThread *thr = Threads::first(); thr != NULL; thr = thr->next())
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355 if (thr!=thr_cur && thr->thread_state() == _thread_in_native) {
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356 ++num_active;
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357 thr->set_terminated(JavaThread::_vm_exited); // per-thread flag
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358 }
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359
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360 return num_active;
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361 }
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362
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363 int VM_Exit::wait_for_threads_in_native_to_block() {
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364 // VM exits at safepoint. This function must be called at the final safepoint
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365 // to wait for threads in _thread_in_native state to be quiescent.
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366 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint already");
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367
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368 Thread * thr_cur = ThreadLocalStorage::get_thread_slow();
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369 Monitor timer(Mutex::leaf, "VM_Exit timer", true);
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370
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371 // Compiler threads need longer wait because they can access VM data directly
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372 // while in native. If they are active and some structures being used are
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373 // deleted by the shutdown sequence, they will crash. On the other hand, user
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374 // threads must go through native=>Java/VM transitions first to access VM
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375 // data, and they will be stopped during state transition. In theory, we
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376 // don't have to wait for user threads to be quiescent, but it's always
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377 // better to terminate VM when current thread is the only active thread, so
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378 // wait for user threads too. Numbers are in 10 milliseconds.
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379 int max_wait_user_thread = 30; // at least 300 milliseconds
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380 int max_wait_compiler_thread = 1000; // at least 10 seconds
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381
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382 int max_wait = max_wait_compiler_thread;
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383
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384 int attempts = 0;
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385 while (true) {
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386 int num_active = 0;
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387 int num_active_compiler_thread = 0;
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388
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389 for(JavaThread *thr = Threads::first(); thr != NULL; thr = thr->next()) {
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390 if (thr!=thr_cur && thr->thread_state() == _thread_in_native) {
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391 num_active++;
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392 if (thr->is_Compiler_thread()) {
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393 num_active_compiler_thread++;
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394 }
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395 }
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396 }
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397
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398 if (num_active == 0) {
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399 return 0;
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400 } else if (attempts > max_wait) {
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401 return num_active;
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402 } else if (num_active_compiler_thread == 0 && attempts > max_wait_user_thread) {
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403 return num_active;
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404 }
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405
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406 attempts++;
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407
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408 MutexLockerEx ml(&timer, Mutex::_no_safepoint_check_flag);
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409 timer.wait(Mutex::_no_safepoint_check_flag, 10);
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410 }
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411 }
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412
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413 void VM_Exit::doit() {
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414 CompileBroker::set_should_block();
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415
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416 // Wait for a short period for threads in native to block. Any thread
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417 // still executing native code after the wait will be stopped at
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418 // native==>Java/VM barriers.
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419 // Among 16276 JCK tests, 94% of them come here without any threads still
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420 // running in native; the other 6% are quiescent within 250ms (Ultra 80).
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421 wait_for_threads_in_native_to_block();
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422
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423 set_vm_exited();
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424
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425 // cleanup globals resources before exiting. exit_globals() currently
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426 // cleans up outputStream resources and PerfMemory resources.
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427 exit_globals();
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428
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429 // Check for exit hook
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430 exit_hook_t exit_hook = Arguments::exit_hook();
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431 if (exit_hook != NULL) {
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432 // exit hook should exit.
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433 exit_hook(_exit_code);
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434 // ... but if it didn't, we must do it here
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435 vm_direct_exit(_exit_code);
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436 } else {
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437 vm_direct_exit(_exit_code);
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438 }
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439 }
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440
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441
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442 void VM_Exit::wait_if_vm_exited() {
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443 if (_vm_exited &&
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444 ThreadLocalStorage::get_thread_slow() != _shutdown_thread) {
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445 // _vm_exited is set at safepoint, and the Threads_lock is never released
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446 // we will block here until the process dies
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447 Threads_lock->lock_without_safepoint_check();
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448 ShouldNotReachHere();
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449 }
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450 }
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