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1 /*
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2 * Copyright 2003-2006 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 class OopClosure;
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26 class ThreadDumpResult;
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27 class ThreadStackTrace;
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28 class ThreadSnapshot;
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29 class StackFrameInfo;
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30 class ThreadConcurrentLocks;
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31 class DeadlockCycle;
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32
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33 // VM monitoring and management support for the thread and
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34 // synchronization subsystem
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35 //
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36 // Thread contention monitoring is disabled by default.
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37 // When enabled, the VM will begin measuring the accumulated
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38 // elapsed time a thread blocked on synchronization.
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39 //
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40 class ThreadService : public AllStatic {
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41 private:
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42 // These counters could be moved to Threads class
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43 static PerfCounter* _total_threads_count;
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44 static PerfVariable* _live_threads_count;
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45 static PerfVariable* _peak_threads_count;
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46 static PerfVariable* _daemon_threads_count;
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47
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48 // These 2 counters are atomically incremented once the thread is exiting.
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49 // They will be atomically decremented when ThreadService::remove_thread is called.
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50 static volatile int _exiting_threads_count;
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51 static volatile int _exiting_daemon_threads_count;
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52
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53 static bool _thread_monitoring_contention_enabled;
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54 static bool _thread_cpu_time_enabled;
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55
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56 // Need to keep the list of thread dump result that
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57 // keep references to methodOop since thread dump can be
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58 // requested by multiple threads concurrently.
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59 static ThreadDumpResult* _threaddump_list;
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60
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61 public:
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62 static void init();
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63 static void add_thread(JavaThread* thread, bool daemon);
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64 static void remove_thread(JavaThread* thread, bool daemon);
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65 static void current_thread_exiting(JavaThread* jt);
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66
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67 static bool set_thread_monitoring_contention(bool flag);
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68 static bool is_thread_monitoring_contention() { return _thread_monitoring_contention_enabled; }
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69
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70 static bool set_thread_cpu_time_enabled(bool flag);
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71 static bool is_thread_cpu_time_enabled() { return _thread_cpu_time_enabled; }
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72
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73 static jlong get_total_thread_count() { return _total_threads_count->get_value(); }
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74 static jlong get_peak_thread_count() { return _peak_threads_count->get_value(); }
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75 static jlong get_live_thread_count() { return _live_threads_count->get_value() - _exiting_threads_count; }
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76 static jlong get_daemon_thread_count() { return _daemon_threads_count->get_value() - _exiting_daemon_threads_count; }
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77
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78 static int exiting_threads_count() { return _exiting_threads_count; }
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79 static int exiting_daemon_threads_count() { return _exiting_daemon_threads_count; }
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80
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81 // Support for thread dump
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82 static void add_thread_dump(ThreadDumpResult* dump);
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83 static void remove_thread_dump(ThreadDumpResult* dump);
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84
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85 static Handle get_current_contended_monitor(JavaThread* thread);
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86
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87 // This function is called by JVM_DumpThreads.
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88 static Handle dump_stack_traces(GrowableArray<instanceHandle>* threads,
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89 int num_threads, TRAPS);
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90
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91 static void reset_peak_thread_count();
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92 static void reset_contention_count_stat(JavaThread* thread);
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93 static void reset_contention_time_stat(JavaThread* thread);
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94
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95 static DeadlockCycle* find_deadlocks_at_safepoint(bool object_monitors_only);
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96
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97 // GC support
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98 static void oops_do(OopClosure* f);
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99 };
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100
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101 // Per-thread Statistics for synchronization
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102 class ThreadStatistics : public CHeapObj {
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103 private:
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104 // The following contention statistics are only updated by
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105 // the thread owning these statistics when contention occurs.
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106
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107 jlong _contended_enter_count;
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108 elapsedTimer _contended_enter_timer;
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109 jlong _monitor_wait_count;
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110 elapsedTimer _monitor_wait_timer;
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111 jlong _sleep_count;
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112 elapsedTimer _sleep_timer;
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113
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114
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115 // These two reset flags are set to true when another thread
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116 // requests to reset the statistics. The actual statistics
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117 // are reset when the thread contention occurs and attempts
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118 // to update the statistics.
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119 bool _count_pending_reset;
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120 bool _timer_pending_reset;
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121
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122 // Keep accurate times for potentially recursive class operations
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123 int _class_init_recursion_count;
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124 int _class_verify_recursion_count;
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125 int _class_link_recursion_count;
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126
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127 // utility functions
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128 void check_and_reset_count() {
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129 if (!_count_pending_reset) return;
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130 _contended_enter_count = 0;
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131 _monitor_wait_count = 0;
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132 _sleep_count = 0;
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133 _count_pending_reset = 0;
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134 }
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135 void check_and_reset_timer() {
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136 if (!_timer_pending_reset) return;
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137 _contended_enter_timer.reset();
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138 _monitor_wait_timer.reset();
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139 _sleep_timer.reset();
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140 _timer_pending_reset = 0;
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141 }
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142
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143 public:
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144 ThreadStatistics();
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145
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146 jlong contended_enter_count() { return (_count_pending_reset ? 0 : _contended_enter_count); }
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147 jlong contended_enter_ticks() { return (_timer_pending_reset ? 0 : _contended_enter_timer.active_ticks()); }
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148 jlong monitor_wait_count() { return (_count_pending_reset ? 0 : _monitor_wait_count); }
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149 jlong monitor_wait_ticks() { return (_timer_pending_reset ? 0 : _monitor_wait_timer.active_ticks()); }
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150 jlong sleep_count() { return (_count_pending_reset ? 0 : _sleep_count); }
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151 jlong sleep_ticks() { return (_timer_pending_reset ? 0 : _sleep_timer.active_ticks()); }
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152
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153 void monitor_wait() { check_and_reset_count(); _monitor_wait_count++; }
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154 void monitor_wait_begin() { check_and_reset_timer(); _monitor_wait_timer.start(); }
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155 void monitor_wait_end() { _monitor_wait_timer.stop(); check_and_reset_timer(); }
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156
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157 void thread_sleep() { check_and_reset_count(); _sleep_count++; }
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158 void thread_sleep_begin() { check_and_reset_timer(); _sleep_timer.start(); }
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159 void thread_sleep_end() { _sleep_timer.stop(); check_and_reset_timer(); }
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160
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161 void contended_enter() { check_and_reset_count(); _contended_enter_count++; }
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162 void contended_enter_begin() { check_and_reset_timer(); _contended_enter_timer.start(); }
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163 void contended_enter_end() { _contended_enter_timer.stop(); check_and_reset_timer(); }
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164
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165 void reset_count_stat() { _count_pending_reset = true; }
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166 void reset_time_stat() { _timer_pending_reset = true; }
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167
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168 int* class_init_recursion_count_addr() { return &_class_init_recursion_count; }
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169 int* class_verify_recursion_count_addr() { return &_class_verify_recursion_count; }
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170 int* class_link_recursion_count_addr() { return &_class_link_recursion_count; }
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171 };
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172
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173 // Thread snapshot to represent the thread state and statistics
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174 class ThreadSnapshot : public CHeapObj {
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175 private:
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176 JavaThread* _thread;
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177 oop _threadObj;
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178 java_lang_Thread::ThreadStatus _thread_status;
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179
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180 bool _is_ext_suspended;
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181 bool _is_in_native;
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182
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183 jlong _contended_enter_ticks;
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184 jlong _contended_enter_count;
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185 jlong _monitor_wait_ticks;
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186 jlong _monitor_wait_count;
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187 jlong _sleep_ticks;
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188 jlong _sleep_count;
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189 oop _blocker_object;
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190 oop _blocker_object_owner;
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191
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192 ThreadStackTrace* _stack_trace;
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193 ThreadConcurrentLocks* _concurrent_locks;
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194 ThreadSnapshot* _next;
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195
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196 public:
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197 // Dummy snapshot
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198 ThreadSnapshot() : _thread(NULL), _threadObj(NULL), _stack_trace(NULL), _concurrent_locks(NULL), _next(NULL),
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199 _blocker_object(NULL), _blocker_object_owner(NULL) {};
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200 ThreadSnapshot(JavaThread* thread);
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201 ~ThreadSnapshot();
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202
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203 java_lang_Thread::ThreadStatus thread_status() { return _thread_status; }
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204
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205 oop threadObj() const { return _threadObj; }
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206
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207 void set_next(ThreadSnapshot* n) { _next = n; }
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208
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209 bool is_ext_suspended() { return _is_ext_suspended; }
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210 bool is_in_native() { return _is_in_native; }
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211
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212 jlong contended_enter_count() { return _contended_enter_count; }
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213 jlong contended_enter_ticks() { return _contended_enter_ticks; }
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214 jlong monitor_wait_count() { return _monitor_wait_count; }
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215 jlong monitor_wait_ticks() { return _monitor_wait_ticks; }
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216 jlong sleep_count() { return _sleep_count; }
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217 jlong sleep_ticks() { return _sleep_ticks; }
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218
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219
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220 oop blocker_object() { return _blocker_object; }
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221 oop blocker_object_owner() { return _blocker_object_owner; }
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222
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223 ThreadSnapshot* next() const { return _next; }
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224 ThreadStackTrace* get_stack_trace() { return _stack_trace; }
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225 ThreadConcurrentLocks* get_concurrent_locks() { return _concurrent_locks; }
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226
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227 void dump_stack_at_safepoint(int max_depth, bool with_locked_monitors);
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228 void set_concurrent_locks(ThreadConcurrentLocks* l) { _concurrent_locks = l; }
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229 void oops_do(OopClosure* f);
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230 };
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231
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232 class ThreadStackTrace : public CHeapObj {
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233 private:
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234 JavaThread* _thread;
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235 int _depth; // number of stack frames added
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236 bool _with_locked_monitors;
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237 GrowableArray<StackFrameInfo*>* _frames;
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238 GrowableArray<oop>* _jni_locked_monitors;
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239
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240 public:
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241
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242 ThreadStackTrace(JavaThread* thread, bool with_locked_monitors);
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243 ~ThreadStackTrace();
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244
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245 StackFrameInfo* stack_frame_at(int i) { return _frames->at(i); }
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246 int get_stack_depth() { return _depth; }
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247
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248 void add_stack_frame(javaVFrame* jvf);
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249 void dump_stack_at_safepoint(int max_depth);
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250 Handle allocate_fill_stack_trace_element_array(TRAPS);
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251 void oops_do(OopClosure* f);
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252 GrowableArray<oop>* jni_locked_monitors() { return _jni_locked_monitors; }
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253 int num_jni_locked_monitors() { return (_jni_locked_monitors != NULL ? _jni_locked_monitors->length() : 0); }
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254
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255 bool is_owned_monitor_on_stack(oop object);
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256 void add_jni_locked_monitor(oop object) { _jni_locked_monitors->append(object); }
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257 };
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258
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259 // StackFrameInfo for keeping methodOop and bci during
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260 // stack walking for later construction of StackTraceElement[]
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261 // Java instances
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262 class StackFrameInfo : public CHeapObj {
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263 private:
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264 methodOop _method;
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265 int _bci;
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266 GrowableArray<oop>* _locked_monitors; // list of object monitors locked by this frame
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267
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268 public:
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269
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270 StackFrameInfo(javaVFrame* jvf, bool with_locked_monitors);
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271 ~StackFrameInfo() {
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272 if (_locked_monitors != NULL) {
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273 delete _locked_monitors;
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274 }
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275 };
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276 methodOop method() const { return _method; }
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277 int bci() const { return _bci; }
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278 void oops_do(OopClosure* f);
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279
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280 int num_locked_monitors() { return (_locked_monitors != NULL ? _locked_monitors->length() : 0); }
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281 GrowableArray<oop>* locked_monitors() { return _locked_monitors; }
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282
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283 void print_on(outputStream* st) const;
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284 };
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285
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286 class ThreadConcurrentLocks : public CHeapObj {
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287 private:
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288 GrowableArray<instanceOop>* _owned_locks;
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289 ThreadConcurrentLocks* _next;
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290 JavaThread* _thread;
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291 public:
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292 ThreadConcurrentLocks(JavaThread* thread);
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293 ~ThreadConcurrentLocks();
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294
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295 void add_lock(instanceOop o);
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296 void set_next(ThreadConcurrentLocks* n) { _next = n; }
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297 ThreadConcurrentLocks* next() { return _next; }
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298 JavaThread* java_thread() { return _thread; }
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299 GrowableArray<instanceOop>* owned_locks() { return _owned_locks; }
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300 void oops_do(OopClosure* f);
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301 };
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302
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303 class ConcurrentLocksDump : public StackObj {
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304 private:
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305 ThreadConcurrentLocks* _map;
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306 ThreadConcurrentLocks* _last; // Last ThreadConcurrentLocks in the map
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307 bool _retain_map_on_free;
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308
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309 void build_map(GrowableArray<oop>* aos_objects);
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310 void add_lock(JavaThread* thread, instanceOop o);
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311
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312 public:
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313 ConcurrentLocksDump(bool retain_map_on_free) : _map(NULL), _last(NULL), _retain_map_on_free(retain_map_on_free) {};
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314 ConcurrentLocksDump() : _map(NULL), _last(NULL), _retain_map_on_free(false) {};
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315 ~ConcurrentLocksDump();
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316
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317 void dump_at_safepoint();
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318 ThreadConcurrentLocks* thread_concurrent_locks(JavaThread* thread);
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319 void print_locks_on(JavaThread* t, outputStream* st);
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320 };
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321
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322 class ThreadDumpResult : public StackObj {
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323 private:
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324 int _num_threads;
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325 int _num_snapshots;
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326 ThreadSnapshot* _snapshots;
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327 ThreadSnapshot* _last;
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328 ThreadDumpResult* _next;
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329 public:
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330 ThreadDumpResult();
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331 ThreadDumpResult(int num_threads);
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332 ~ThreadDumpResult();
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333
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334 void add_thread_snapshot(ThreadSnapshot* ts);
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335 void set_next(ThreadDumpResult* next) { _next = next; }
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336 ThreadDumpResult* next() { return _next; }
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337 int num_threads() { return _num_threads; }
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338 int num_snapshots() { return _num_snapshots; }
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339 ThreadSnapshot* snapshots() { return _snapshots; }
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340 void oops_do(OopClosure* f);
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341 };
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342
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343 class DeadlockCycle : public CHeapObj {
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344 private:
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345 bool _is_deadlock;
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346 GrowableArray<JavaThread*>* _threads;
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347 DeadlockCycle* _next;
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348 public:
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349 DeadlockCycle();
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350 ~DeadlockCycle();
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351
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352 DeadlockCycle* next() { return _next; }
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353 void set_next(DeadlockCycle* d) { _next = d; }
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354 void add_thread(JavaThread* t) { _threads->append(t); }
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355 void reset() { _is_deadlock = false; _threads->clear(); }
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356 void set_deadlock(bool value) { _is_deadlock = value; }
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357 bool is_deadlock() { return _is_deadlock; }
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358 int num_threads() { return _threads->length(); }
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359 GrowableArray<JavaThread*>* threads() { return _threads; }
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360 void print_on(outputStream* st) const;
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361 };
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362
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363 // Utility class to get list of java threads.
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364 class ThreadsListEnumerator : public StackObj {
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365 private:
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366 GrowableArray<instanceHandle>* _threads_array;
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367 public:
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368 ThreadsListEnumerator(Thread* cur_thread,
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369 bool include_jvmti_agent_threads = false,
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370 bool include_jni_attaching_threads = true);
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371 int num_threads() { return _threads_array->length(); }
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372 instanceHandle get_threadObj(int index) { return _threads_array->at(index); }
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373 };
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374
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375
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376 // abstract utility class to set new thread states, and restore previous after the block exits
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377 class JavaThreadStatusChanger : public StackObj {
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378 private:
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379 java_lang_Thread::ThreadStatus _old_state;
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380 JavaThread* _java_thread;
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381 bool _is_alive;
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382
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383 void save_old_state(JavaThread* java_thread) {
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384 _java_thread = java_thread;
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385 _is_alive = is_alive(java_thread);
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386 if (is_alive()) {
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387 _old_state = java_lang_Thread::get_thread_status(_java_thread->threadObj());
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388 }
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389 }
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390
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391 public:
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392 static void set_thread_status(JavaThread* java_thread,
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393 java_lang_Thread::ThreadStatus state) {
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394 java_lang_Thread::set_thread_status(java_thread->threadObj(), state);
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395 }
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396
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397 void set_thread_status(java_lang_Thread::ThreadStatus state) {
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398 if (is_alive()) {
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399 set_thread_status(_java_thread, state);
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400 }
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401 }
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402
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403 JavaThreadStatusChanger(JavaThread* java_thread,
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404 java_lang_Thread::ThreadStatus state) {
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405 save_old_state(java_thread);
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406 set_thread_status(state);
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407 }
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408
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409 JavaThreadStatusChanger(JavaThread* java_thread) {
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410 save_old_state(java_thread);
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411 }
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412
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413 ~JavaThreadStatusChanger() {
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414 set_thread_status(_old_state);
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415 }
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416
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417 static bool is_alive(JavaThread* java_thread) {
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418 return java_thread != NULL && java_thread->threadObj() != NULL;
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419 }
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420
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421 bool is_alive() {
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422 return _is_alive;
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423 }
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424 };
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425
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426 // Change status to waiting on an object (timed or indefinite)
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427 class JavaThreadInObjectWaitState : public JavaThreadStatusChanger {
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428 private:
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429 ThreadStatistics* _stat;
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430 bool _active;
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431
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432 public:
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433 JavaThreadInObjectWaitState(JavaThread *java_thread, bool timed) :
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434 JavaThreadStatusChanger(java_thread,
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435 timed ? java_lang_Thread::IN_OBJECT_WAIT_TIMED : java_lang_Thread::IN_OBJECT_WAIT) {
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436 if (is_alive()) {
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437 _stat = java_thread->get_thread_stat();
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438 _active = ThreadService::is_thread_monitoring_contention();
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439 _stat->monitor_wait();
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440 if (_active) {
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441 _stat->monitor_wait_begin();
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442 }
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443 } else {
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444 _active = false;
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445 }
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446 }
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447
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448 ~JavaThreadInObjectWaitState() {
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449 if (_active) {
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450 _stat->monitor_wait_end();
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451 }
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452 }
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453 };
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454
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455 // Change status to parked (timed or indefinite)
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456 class JavaThreadParkedState : public JavaThreadStatusChanger {
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457 private:
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458 ThreadStatistics* _stat;
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459 bool _active;
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460
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461 public:
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462 JavaThreadParkedState(JavaThread *java_thread, bool timed) :
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463 JavaThreadStatusChanger(java_thread,
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464 timed ? java_lang_Thread::PARKED_TIMED : java_lang_Thread::PARKED) {
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465 if (is_alive()) {
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466 _stat = java_thread->get_thread_stat();
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467 _active = ThreadService::is_thread_monitoring_contention();
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468 _stat->monitor_wait();
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469 if (_active) {
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470 _stat->monitor_wait_begin();
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471 }
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472 } else {
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473 _active = false;
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474 }
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475 }
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476
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477 ~JavaThreadParkedState() {
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478 if (_active) {
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479 _stat->monitor_wait_end();
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480 }
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481 }
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482 };
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483
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484 // Change status to blocked on (re-)entering a synchronization block
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485 class JavaThreadBlockedOnMonitorEnterState : public JavaThreadStatusChanger {
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486 private:
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487 ThreadStatistics* _stat;
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488 bool _active;
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489
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490 static bool contended_enter_begin(JavaThread *java_thread) {
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491 set_thread_status(java_thread, java_lang_Thread::BLOCKED_ON_MONITOR_ENTER);
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492 ThreadStatistics* stat = java_thread->get_thread_stat();
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493 stat->contended_enter();
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494 bool active = ThreadService::is_thread_monitoring_contention();
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495 if (active) {
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496 stat->contended_enter_begin();
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497 }
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498 return active;
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499 }
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500
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501 public:
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502 // java_thread is waiting thread being blocked on monitor reenter.
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503 // Current thread is the notifying thread which holds the monitor.
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504 static bool wait_reenter_begin(JavaThread *java_thread, ObjectMonitor *obj_m) {
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505 assert((java_thread != NULL), "Java thread should not be null here");
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506 bool active = false;
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507 if (is_alive(java_thread) && ServiceUtil::visible_oop((oop)obj_m->object())) {
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508 active = contended_enter_begin(java_thread);
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509 }
|
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510 return active;
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511 }
|
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512
|
|
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513 static void wait_reenter_end(JavaThread *java_thread, bool active) {
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514 if (active) {
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515 java_thread->get_thread_stat()->contended_enter_end();
|
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516 }
|
|
|
517 set_thread_status(java_thread, java_lang_Thread::RUNNABLE);
|
|
|
518 }
|
|
|
519
|
|
|
520 JavaThreadBlockedOnMonitorEnterState(JavaThread *java_thread, ObjectMonitor *obj_m) :
|
|
|
521 JavaThreadStatusChanger(java_thread) {
|
|
|
522 assert((java_thread != NULL), "Java thread should not be null here");
|
|
|
523 // Change thread status and collect contended enter stats for monitor contended
|
|
|
524 // enter done for external java world objects and it is contended. All other cases
|
|
|
525 // like for vm internal objects and for external objects which are not contended
|
|
|
526 // thread status is not changed and contended enter stat is not collected.
|
|
|
527 _active = false;
|
|
|
528 if (is_alive() && ServiceUtil::visible_oop((oop)obj_m->object()) && obj_m->contentions() > 0) {
|
|
|
529 _stat = java_thread->get_thread_stat();
|
|
|
530 _active = contended_enter_begin(java_thread);
|
|
|
531 }
|
|
|
532 }
|
|
|
533
|
|
|
534 ~JavaThreadBlockedOnMonitorEnterState() {
|
|
|
535 if (_active) {
|
|
|
536 _stat->contended_enter_end();
|
|
|
537 }
|
|
|
538 }
|
|
|
539 };
|
|
|
540
|
|
|
541 // Change status to sleeping
|
|
|
542 class JavaThreadSleepState : public JavaThreadStatusChanger {
|
|
|
543 private:
|
|
|
544 ThreadStatistics* _stat;
|
|
|
545 bool _active;
|
|
|
546 public:
|
|
|
547 JavaThreadSleepState(JavaThread *java_thread) :
|
|
|
548 JavaThreadStatusChanger(java_thread, java_lang_Thread::SLEEPING) {
|
|
|
549 if (is_alive()) {
|
|
|
550 _stat = java_thread->get_thread_stat();
|
|
|
551 _active = ThreadService::is_thread_monitoring_contention();
|
|
|
552 _stat->thread_sleep();
|
|
|
553 if (_active) {
|
|
|
554 _stat->thread_sleep_begin();
|
|
|
555 }
|
|
|
556 } else {
|
|
|
557 _active = false;
|
|
|
558 }
|
|
|
559 }
|
|
|
560
|
|
|
561 ~JavaThreadSleepState() {
|
|
|
562 if (_active) {
|
|
|
563 _stat->thread_sleep_end();
|
|
|
564 }
|
|
|
565 }
|
|
|
566 };
|
