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annotate src/share/vm/runtime/task.cpp @ 6939:c284cf4781f0

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7127792: Add the ability to change an existing PeriodicTask's execution interval Summary: Enables dynamic enrollment / disenrollment from the PeriodicTasks in WatcherThread. Reviewed-by: dholmes, mgronlun
author rbackman
date Thu, 04 Oct 2012 14:55:57 +0200
parents f08d439fab8c
children f34d701e952e
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1 /*
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2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26 #include "memory/allocation.hpp"
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27 #include "runtime/init.hpp"
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28 #include "runtime/task.hpp"
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29 #include "runtime/timer.hpp"
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30 #ifdef TARGET_OS_FAMILY_linux
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31 # include "os_linux.inline.hpp"
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32 # include "thread_linux.inline.hpp"
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33 #endif
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34 #ifdef TARGET_OS_FAMILY_solaris
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35 # include "os_solaris.inline.hpp"
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36 # include "thread_solaris.inline.hpp"
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37 #endif
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38 #ifdef TARGET_OS_FAMILY_windows
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39 # include "os_windows.inline.hpp"
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40 # include "thread_windows.inline.hpp"
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41 #endif
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42 #ifdef TARGET_OS_FAMILY_bsd
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43 # include "os_bsd.inline.hpp"
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44 # include "thread_bsd.inline.hpp"
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45 #endif
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46
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47 int PeriodicTask::_num_tasks = 0;
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48 PeriodicTask* PeriodicTask::_tasks[PeriodicTask::max_tasks];
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49 #ifndef PRODUCT
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50 elapsedTimer PeriodicTask::_timer;
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51 int PeriodicTask::_intervalHistogram[PeriodicTask::max_interval];
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52 int PeriodicTask::_ticks;
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53
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54 void PeriodicTask::print_intervals() {
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55 if (ProfilerCheckIntervals) {
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56 for (int i = 0; i < PeriodicTask::max_interval; i++) {
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57 int n = _intervalHistogram[i];
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58 if (n > 0) tty->print_cr("%3d: %5d (%4.1f%%)", i, n, 100.0 * n / _ticks);
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59 }
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60 }
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61 }
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62 #endif
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63
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64 void PeriodicTask::real_time_tick(int delay_time) {
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65 #ifndef PRODUCT
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66 if (ProfilerCheckIntervals) {
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67 _ticks++;
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68 _timer.stop();
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69 int ms = (int)(_timer.seconds() * 1000.0);
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70 _timer.reset();
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71 _timer.start();
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72 if (ms >= PeriodicTask::max_interval) ms = PeriodicTask::max_interval - 1;
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73 _intervalHistogram[ms]++;
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74 }
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75 #endif
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76
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77 {
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78 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag);
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79 int orig_num_tasks = _num_tasks;
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80
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81 for(int index = 0; index < _num_tasks; index++) {
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82 _tasks[index]->execute_if_pending(delay_time);
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83 if (_num_tasks < orig_num_tasks) { // task dis-enrolled itself
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84 index--; // re-do current slot as it has changed
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85 orig_num_tasks = _num_tasks;
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86 }
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87 }
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88 }
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89 }
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90
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91 int PeriodicTask::time_to_wait() {
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92 MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ?
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93 NULL : PeriodicTask_lock, Mutex::_no_safepoint_check_flag);
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94
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95 if (_num_tasks == 0) {
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96 return 0; // sleep until shutdown or a task is enrolled
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97 }
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98
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99 int delay = _tasks[0]->time_to_next_interval();
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100 for (int index = 1; index < _num_tasks; index++) {
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101 delay = MIN2(delay, _tasks[index]->time_to_next_interval());
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102 }
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103 return delay;
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104 }
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105
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106
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107 PeriodicTask::PeriodicTask(size_t interval_time) :
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108 _counter(0), _interval((int) interval_time) {
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109 // Sanity check the interval time
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110 assert(_interval >= PeriodicTask::min_interval &&
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111 _interval <= PeriodicTask::max_interval &&
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112 _interval % PeriodicTask::interval_gran == 0,
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113 "improper PeriodicTask interval time");
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114 }
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115
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116 PeriodicTask::~PeriodicTask() {
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117 disenroll();
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118 }
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119
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120 void PeriodicTask::enroll() {
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121 MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ?
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122 NULL : PeriodicTask_lock, Mutex::_no_safepoint_check_flag);
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123
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124 if (_num_tasks == PeriodicTask::max_tasks) {
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125 fatal("Overflow in PeriodicTask table");
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126 }
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127 _tasks[_num_tasks++] = this;
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128
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129 WatcherThread* thread = WatcherThread::watcher_thread();
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130 if (thread) {
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131 thread->unpark();
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132 } else {
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133 WatcherThread::start();
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134 }
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135 }
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136
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137 void PeriodicTask::disenroll() {
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138 MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ?
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139 NULL : PeriodicTask_lock, Mutex::_no_safepoint_check_flag);
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140
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141 int index;
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142 for(index = 0; index < _num_tasks && _tasks[index] != this; index++)
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143 ;
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144
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145 if (index == _num_tasks) {
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146 return;
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147 }
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148
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149 _num_tasks--;
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150
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151 for (; index < _num_tasks; index++) {
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152 _tasks[index] = _tasks[index+1];
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153 }
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154 }