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comparison src/share/vm/runtime/task.cpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children 5a76ab815e34
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 # include "incls/_precompiled.incl"
26 # include "incls/_task.cpp.incl"
27
28 int PeriodicTask::_num_tasks = 0;
29 PeriodicTask* PeriodicTask::_tasks[PeriodicTask::max_tasks];
30 #ifndef PRODUCT
31 elapsedTimer PeriodicTask::_timer;
32 int PeriodicTask::_intervalHistogram[PeriodicTask::max_interval];
33 int PeriodicTask::_ticks;
34
35 void PeriodicTask::print_intervals() {
36 if (ProfilerCheckIntervals) {
37 for (int i = 0; i < PeriodicTask::max_interval; i++) {
38 int n = _intervalHistogram[i];
39 if (n > 0) tty->print_cr("%3d: %5d (%4.1f%%)", i, n, 100.0 * n / _ticks);
40 }
41 }
42 }
43 #endif
44
45 void PeriodicTask::real_time_tick(size_t delay_time) {
46 #ifndef PRODUCT
47 if (ProfilerCheckIntervals) {
48 _ticks++;
49 _timer.stop();
50 int ms = (int)(_timer.seconds() * 1000.0);
51 _timer.reset();
52 _timer.start();
53 if (ms >= PeriodicTask::max_interval) ms = PeriodicTask::max_interval - 1;
54 _intervalHistogram[ms]++;
55 }
56 #endif
57 int orig_num_tasks = _num_tasks;
58 for(int index = 0; index < _num_tasks; index++) {
59 _tasks[index]->execute_if_pending(delay_time);
60 if (_num_tasks < orig_num_tasks) { // task dis-enrolled itself
61 index--; // re-do current slot as it has changed
62 orig_num_tasks = _num_tasks;
63 }
64 }
65 }
66
67
68 PeriodicTask::PeriodicTask(size_t interval_time) :
69 _counter(0), _interval(interval_time) {
70 assert(is_init_completed(), "Periodic tasks should not start during VM initialization");
71 // Sanity check the interval time
72 assert(_interval >= PeriodicTask::min_interval &&
73 _interval <= PeriodicTask::max_interval &&
74 _interval % PeriodicTask::interval_gran == 0,
75 "improper PeriodicTask interval time");
76 }
77
78 PeriodicTask::~PeriodicTask() {
79 if (is_enrolled())
80 disenroll();
81 }
82
83 bool PeriodicTask::is_enrolled() const {
84 for(int index = 0; index < _num_tasks; index++)
85 if (_tasks[index] == this) return true;
86 return false;
87 }
88
89 void PeriodicTask::enroll() {
90 assert(WatcherThread::watcher_thread() == NULL, "dynamic enrollment of tasks not yet supported");
91
92 if (_num_tasks == PeriodicTask::max_tasks)
93 fatal("Overflow in PeriodicTask table");
94 _tasks[_num_tasks++] = this;
95 }
96
97 void PeriodicTask::disenroll() {
98 assert(WatcherThread::watcher_thread() == NULL ||
99 Thread::current() == WatcherThread::watcher_thread(),
100 "dynamic disenrollment currently only handled from WatcherThread from within task() method");
101
102 int index;
103 for(index = 0; index < _num_tasks && _tasks[index] != this; index++);
104 if (index == _num_tasks) return;
105 _num_tasks--;
106 for (; index < _num_tasks; index++) {
107 _tasks[index] = _tasks[index+1];
108 }
109 }
110
111 TimeMillisUpdateTask* TimeMillisUpdateTask::_task = NULL;
112
113 void TimeMillisUpdateTask::task() {
114 os::update_global_time();
115 }
116
117 void TimeMillisUpdateTask::engage() {
118 assert(_task == NULL, "init twice?");
119 os::update_global_time(); // initial update
120 os::enable_global_time();
121 _task = new TimeMillisUpdateTask(CacheTimeMillisGranularity);
122 _task->enroll();
123 }
124
125 void TimeMillisUpdateTask::disengage() {
126 assert(_task != NULL, "uninit twice?");
127 os::disable_global_time();
128 _task->disenroll();
129 delete _task;
130 _task = NULL;
131 }