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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/_task.cpp.incl"
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27
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28 int PeriodicTask::_num_tasks = 0;
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29 PeriodicTask* PeriodicTask::_tasks[PeriodicTask::max_tasks];
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30 #ifndef PRODUCT
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31 elapsedTimer PeriodicTask::_timer;
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32 int PeriodicTask::_intervalHistogram[PeriodicTask::max_interval];
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33 int PeriodicTask::_ticks;
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34
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35 void PeriodicTask::print_intervals() {
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36 if (ProfilerCheckIntervals) {
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37 for (int i = 0; i < PeriodicTask::max_interval; i++) {
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38 int n = _intervalHistogram[i];
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39 if (n > 0) tty->print_cr("%3d: %5d (%4.1f%%)", i, n, 100.0 * n / _ticks);
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40 }
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41 }
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42 }
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43 #endif
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44
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45 void PeriodicTask::real_time_tick(size_t delay_time) {
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46 #ifndef PRODUCT
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47 if (ProfilerCheckIntervals) {
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48 _ticks++;
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49 _timer.stop();
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50 int ms = (int)(_timer.seconds() * 1000.0);
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51 _timer.reset();
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52 _timer.start();
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53 if (ms >= PeriodicTask::max_interval) ms = PeriodicTask::max_interval - 1;
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54 _intervalHistogram[ms]++;
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55 }
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56 #endif
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57 int orig_num_tasks = _num_tasks;
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58 for(int index = 0; index < _num_tasks; index++) {
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59 _tasks[index]->execute_if_pending(delay_time);
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60 if (_num_tasks < orig_num_tasks) { // task dis-enrolled itself
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61 index--; // re-do current slot as it has changed
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62 orig_num_tasks = _num_tasks;
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63 }
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64 }
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65 }
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66
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67
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68 PeriodicTask::PeriodicTask(size_t interval_time) :
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69 _counter(0), _interval(interval_time) {
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70 assert(is_init_completed(), "Periodic tasks should not start during VM initialization");
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71 // Sanity check the interval time
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72 assert(_interval >= PeriodicTask::min_interval &&
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73 _interval <= PeriodicTask::max_interval &&
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74 _interval % PeriodicTask::interval_gran == 0,
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75 "improper PeriodicTask interval time");
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76 }
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77
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78 PeriodicTask::~PeriodicTask() {
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79 if (is_enrolled())
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80 disenroll();
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81 }
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82
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83 bool PeriodicTask::is_enrolled() const {
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84 for(int index = 0; index < _num_tasks; index++)
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85 if (_tasks[index] == this) return true;
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86 return false;
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87 }
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88
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89 void PeriodicTask::enroll() {
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90 assert(WatcherThread::watcher_thread() == NULL, "dynamic enrollment of tasks not yet supported");
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91
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92 if (_num_tasks == PeriodicTask::max_tasks)
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93 fatal("Overflow in PeriodicTask table");
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94 _tasks[_num_tasks++] = this;
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95 }
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96
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97 void PeriodicTask::disenroll() {
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98 assert(WatcherThread::watcher_thread() == NULL ||
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99 Thread::current() == WatcherThread::watcher_thread(),
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100 "dynamic disenrollment currently only handled from WatcherThread from within task() method");
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101
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102 int index;
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103 for(index = 0; index < _num_tasks && _tasks[index] != this; index++);
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104 if (index == _num_tasks) return;
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105 _num_tasks--;
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106 for (; index < _num_tasks; index++) {
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107 _tasks[index] = _tasks[index+1];
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108 }
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109 }
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