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1 /*
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196
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2 * Copyright 1997-2008 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/_mutexLocker.cpp.incl"
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27
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28 // Mutexes used in the VM (see comment in mutexLocker.hpp):
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29 //
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30 // Note that the following pointers are effectively final -- after having been
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31 // set at JVM startup-time, they should never be subsequently mutated.
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32 // Instead of using pointers to malloc()ed monitors and mutexes we should consider
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33 // eliminating the indirection and using instances instead.
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34 // Consider using GCC's __read_mostly.
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35
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36 Mutex* Patching_lock = NULL;
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37 Monitor* SystemDictionary_lock = NULL;
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38 Mutex* PackageTable_lock = NULL;
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39 Mutex* CompiledIC_lock = NULL;
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40 Mutex* InlineCacheBuffer_lock = NULL;
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41 Mutex* VMStatistic_lock = NULL;
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42 Mutex* JNIGlobalHandle_lock = NULL;
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43 Mutex* JNIHandleBlockFreeList_lock = NULL;
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44 Mutex* JNICachedItableIndex_lock = NULL;
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45 Mutex* JmethodIdCreation_lock = NULL;
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46 Mutex* JfieldIdCreation_lock = NULL;
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47 Monitor* JNICritical_lock = NULL;
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48 Mutex* JvmtiThreadState_lock = NULL;
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49 Monitor* JvmtiPendingEvent_lock = NULL;
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50 Mutex* Heap_lock = NULL;
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51 Mutex* ExpandHeap_lock = NULL;
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52 Mutex* AdapterHandlerLibrary_lock = NULL;
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53 Mutex* SignatureHandlerLibrary_lock = NULL;
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54 Mutex* VtableStubs_lock = NULL;
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55 Mutex* SymbolTable_lock = NULL;
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56 Mutex* StringTable_lock = NULL;
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57 Mutex* CodeCache_lock = NULL;
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58 Mutex* MethodData_lock = NULL;
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59 Mutex* RetData_lock = NULL;
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60 Monitor* VMOperationQueue_lock = NULL;
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61 Monitor* VMOperationRequest_lock = NULL;
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62 Monitor* Safepoint_lock = NULL;
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63 Monitor* SerializePage_lock = NULL;
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64 Monitor* Threads_lock = NULL;
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65 Monitor* CGC_lock = NULL;
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66 Mutex* STS_init_lock = NULL;
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67 Monitor* SLT_lock = NULL;
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68 Monitor* iCMS_lock = NULL;
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69 Monitor* FullGCCount_lock = NULL;
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70 Mutex* ParGCRareEvent_lock = NULL;
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71 Mutex* DerivedPointerTableGC_lock = NULL;
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72 Mutex* Compile_lock = NULL;
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73 Monitor* MethodCompileQueue_lock = NULL;
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74 #ifdef TIERED
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75 Monitor* C1_lock = NULL;
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76 #endif // TIERED
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77 Monitor* CompileThread_lock = NULL;
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78 Mutex* CompileTaskAlloc_lock = NULL;
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79 Mutex* CompileStatistics_lock = NULL;
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80 Mutex* MultiArray_lock = NULL;
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81 Monitor* Terminator_lock = NULL;
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82 Monitor* BeforeExit_lock = NULL;
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83 Monitor* Notify_lock = NULL;
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84 Monitor* Interrupt_lock = NULL;
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85 Monitor* ProfileVM_lock = NULL;
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86 Mutex* ProfilePrint_lock = NULL;
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87 Mutex* ExceptionCache_lock = NULL;
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88 Monitor* ObjAllocPost_lock = NULL;
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89 Mutex* OsrList_lock = NULL;
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90 #ifndef PRODUCT
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91 Mutex* FullGCALot_lock = NULL;
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92 #endif
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93
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94 Mutex* Debug1_lock = NULL;
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95 Mutex* Debug2_lock = NULL;
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96 Mutex* Debug3_lock = NULL;
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97
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98 Mutex* tty_lock = NULL;
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99
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100 Mutex* RawMonitor_lock = NULL;
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101 Mutex* PerfDataMemAlloc_lock = NULL;
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102 Mutex* PerfDataManager_lock = NULL;
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103 Mutex* OopMapCacheAlloc_lock = NULL;
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104
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105 Monitor* GCTaskManager_lock = NULL;
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106
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107 Mutex* Management_lock = NULL;
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108 Monitor* LowMemory_lock = NULL;
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109
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110 #define MAX_NUM_MUTEX 128
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111 static Monitor * _mutex_array[MAX_NUM_MUTEX];
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112 static int _num_mutex;
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113
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114 #ifdef ASSERT
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115 void assert_locked_or_safepoint(const Monitor * lock) {
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116 // check if this thread owns the lock (common case)
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117 if (IgnoreLockingAssertions) return;
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118 assert(lock != NULL, "Need non-NULL lock");
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119 if (lock->owned_by_self()) return;
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120 if (SafepointSynchronize::is_at_safepoint()) return;
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121 if (!Universe::is_fully_initialized()) return;
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122 // see if invoker of VM operation owns it
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123 VM_Operation* op = VMThread::vm_operation();
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124 if (op != NULL && op->calling_thread() == lock->owner()) return;
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125 fatal1("must own lock %s", lock->name());
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126 }
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127
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128 // a stronger assertion than the above
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129 void assert_lock_strong(const Monitor * lock) {
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130 if (IgnoreLockingAssertions) return;
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131 assert(lock != NULL, "Need non-NULL lock");
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132 if (lock->owned_by_self()) return;
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133 fatal1("must own lock %s", lock->name());
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134 }
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135 #endif
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136
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137 #define def(var, type, pri, vm_block) { \
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138 var = new type(Mutex::pri, #var, vm_block); \
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139 assert(_num_mutex < MAX_NUM_MUTEX, \
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140 "increase MAX_NUM_MUTEX"); \
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141 _mutex_array[_num_mutex++] = var; \
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142 }
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143
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144 void mutex_init() {
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145 def(tty_lock , Mutex , event, true ); // allow to lock in VM
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146
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147 def(CGC_lock , Monitor, special, true ); // coordinate between fore- and background GC
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148 def(STS_init_lock , Mutex, leaf, true );
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149 if (UseConcMarkSweepGC) {
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150 def(iCMS_lock , Monitor, special, true ); // CMS incremental mode start/stop notification
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151 def(FullGCCount_lock , Monitor, leaf, true ); // in support of ExplicitGCInvokesConcurrent
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152 }
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153 def(ParGCRareEvent_lock , Mutex , leaf , true );
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154 def(DerivedPointerTableGC_lock , Mutex, leaf, true );
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155 def(CodeCache_lock , Mutex , special, true );
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156 def(Interrupt_lock , Monitor, special, true ); // used for interrupt processing
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157 def(RawMonitor_lock , Mutex, special, true );
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158 def(OopMapCacheAlloc_lock , Mutex, leaf, true ); // used for oop_map_cache allocation.
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159
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160 def(Patching_lock , Mutex , special, true ); // used for safepointing and code patching.
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161 def(ObjAllocPost_lock , Monitor, special, false);
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162 def(LowMemory_lock , Monitor, special, true ); // used for low memory detection
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163 def(JmethodIdCreation_lock , Mutex , leaf, true ); // used for creating jmethodIDs.
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164
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165 def(SystemDictionary_lock , Monitor, leaf, true ); // lookups done by VM thread
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166 def(PackageTable_lock , Mutex , leaf, false);
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167 def(InlineCacheBuffer_lock , Mutex , leaf, true );
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168 def(VMStatistic_lock , Mutex , leaf, false);
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169 def(ExpandHeap_lock , Mutex , leaf, true ); // Used during compilation by VM thread
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170 def(JNIHandleBlockFreeList_lock , Mutex , leaf, true ); // handles are used by VM thread
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171 def(SignatureHandlerLibrary_lock , Mutex , leaf, false);
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172 def(SymbolTable_lock , Mutex , leaf, true );
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173 def(StringTable_lock , Mutex , leaf, true );
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174 def(ProfilePrint_lock , Mutex , leaf, false); // serial profile printing
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175 def(ExceptionCache_lock , Mutex , leaf, false); // serial profile printing
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176 def(OsrList_lock , Mutex , leaf, true );
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177 def(Debug1_lock , Mutex , leaf, true );
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178 #ifndef PRODUCT
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179 def(FullGCALot_lock , Mutex , leaf, false); // a lock to make FullGCALot MT safe
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180 #endif
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181 def(BeforeExit_lock , Monitor, leaf, true );
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182 def(PerfDataMemAlloc_lock , Mutex , leaf, true ); // used for allocating PerfData memory for performance data
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183 def(PerfDataManager_lock , Mutex , leaf, true ); // used for synchronized access to PerfDataManager resources
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184
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185 // CMS_modUnionTable_lock leaf
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186 // CMS_bitMap_lock leaf + 1
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187 // CMS_freeList_lock leaf + 2
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188
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189 def(Safepoint_lock , Monitor, safepoint, true ); // locks SnippetCache_lock/Threads_lock
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190
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191 def(Threads_lock , Monitor, barrier, true );
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192
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193 def(VMOperationQueue_lock , Monitor, nonleaf, true ); // VM_thread allowed to block on these
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194 def(VMOperationRequest_lock , Monitor, nonleaf, true );
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195 def(RetData_lock , Mutex , nonleaf, false);
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196 def(Terminator_lock , Monitor, nonleaf, true );
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197 def(VtableStubs_lock , Mutex , nonleaf, true );
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198 def(Notify_lock , Monitor, nonleaf, true );
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199 def(JNIGlobalHandle_lock , Mutex , nonleaf, true ); // locks JNIHandleBlockFreeList_lock
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200 def(JNICritical_lock , Monitor, nonleaf, true ); // used for JNI critical regions
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201 def(AdapterHandlerLibrary_lock , Mutex , nonleaf, true);
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202 if (UseConcMarkSweepGC) {
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203 def(SLT_lock , Monitor, nonleaf, false );
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204 // used in CMS GC for locking PLL lock
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205 }
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206 def(Heap_lock , Mutex , nonleaf+1, false);
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207 def(JfieldIdCreation_lock , Mutex , nonleaf+1, true ); // jfieldID, Used in VM_Operation
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208 def(JNICachedItableIndex_lock , Mutex , nonleaf+1, false); // Used to cache an itable index during JNI invoke
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209
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210 def(CompiledIC_lock , Mutex , nonleaf+2, false); // locks VtableStubs_lock, InlineCacheBuffer_lock
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211 def(CompileTaskAlloc_lock , Mutex , nonleaf+2, true );
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212 def(CompileStatistics_lock , Mutex , nonleaf+2, false);
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213 def(MultiArray_lock , Mutex , nonleaf+2, false); // locks SymbolTable_lock
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214
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215 def(JvmtiThreadState_lock , Mutex , nonleaf+2, false); // Used by JvmtiThreadState/JvmtiEventController
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216 def(JvmtiPendingEvent_lock , Monitor, nonleaf, false); // Used by JvmtiCodeBlobEvents
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217 def(Management_lock , Mutex , nonleaf+2, false); // used for JVM management
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218
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219 def(Compile_lock , Mutex , nonleaf+3, true );
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220 def(MethodData_lock , Mutex , nonleaf+3, false);
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221
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222 def(MethodCompileQueue_lock , Monitor, nonleaf+4, true );
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223 def(Debug2_lock , Mutex , nonleaf+4, true );
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224 def(Debug3_lock , Mutex , nonleaf+4, true );
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225 def(ProfileVM_lock , Monitor, nonleaf+4, false); // used for profiling of the VMThread
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226 def(CompileThread_lock , Monitor, nonleaf+5, false );
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227 #ifdef TIERED
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228 def(C1_lock , Monitor, nonleaf+5, false );
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229 #endif // TIERED
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230
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231
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232 }
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233
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234 GCMutexLocker::GCMutexLocker(Monitor * mutex) {
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235 if (SafepointSynchronize::is_at_safepoint()) {
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236 _locked = false;
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237 } else {
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238 _mutex = mutex;
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239 _locked = true;
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240 _mutex->lock();
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241 }
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242 }
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243
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244 // Print all mutexes/monitors that are currently owned by a thread; called
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245 // by fatal error handler.
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246 void print_owned_locks_on_error(outputStream* st) {
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247 st->print("VM Mutex/Monitor currently owned by a thread: ");
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248 bool none = true;
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249 for (int i = 0; i < _num_mutex; i++) {
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250 // see if it has an owner
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251 if (_mutex_array[i]->owner() != NULL) {
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252 if (none) {
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253 // print format used by Mutex::print_on_error()
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254 st->print_cr(" ([mutex/lock_event])");
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255 none = false;
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256 }
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257 _mutex_array[i]->print_on_error(st);
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258 st->cr();
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259 }
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260 }
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261 if (none) st->print_cr("None");
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262 }
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