1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
/*
* Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
*/
# include "incls/_precompiled.incl"
# include "incls/_task.cpp.incl"
int PeriodicTask::_num_tasks = 0;
PeriodicTask* PeriodicTask::_tasks[PeriodicTask::max_tasks];
#ifndef PRODUCT
elapsedTimer PeriodicTask::_timer;
int PeriodicTask::_intervalHistogram[PeriodicTask::max_interval];
int PeriodicTask::_ticks;
void PeriodicTask::print_intervals() {
if (ProfilerCheckIntervals) {
for (int i = 0; i < PeriodicTask::max_interval; i++) {
int n = _intervalHistogram[i];
if (n > 0) tty->print_cr("%3d: %5d (%4.1f%%)", i, n, 100.0 * n / _ticks);
}
}
}
#endif
void PeriodicTask::real_time_tick(size_t delay_time) {
#ifndef PRODUCT
if (ProfilerCheckIntervals) {
_ticks++;
_timer.stop();
int ms = (int)(_timer.seconds() * 1000.0);
_timer.reset();
_timer.start();
if (ms >= PeriodicTask::max_interval) ms = PeriodicTask::max_interval - 1;
_intervalHistogram[ms]++;
}
#endif
int orig_num_tasks = _num_tasks;
for(int index = 0; index < _num_tasks; index++) {
_tasks[index]->execute_if_pending(delay_time);
if (_num_tasks < orig_num_tasks) { // task dis-enrolled itself
index--; // re-do current slot as it has changed
orig_num_tasks = _num_tasks;
}
}
}
PeriodicTask::PeriodicTask(size_t interval_time) :
_counter(0), _interval(interval_time) {
assert(is_init_completed(), "Periodic tasks should not start during VM initialization");
// Sanity check the interval time
assert(_interval >= PeriodicTask::min_interval &&
_interval <= PeriodicTask::max_interval &&
_interval % PeriodicTask::interval_gran == 0,
"improper PeriodicTask interval time");
}
PeriodicTask::~PeriodicTask() {
if (is_enrolled())
disenroll();
}
bool PeriodicTask::is_enrolled() const {
for(int index = 0; index < _num_tasks; index++)
if (_tasks[index] == this) return true;
return false;
}
void PeriodicTask::enroll() {
assert(WatcherThread::watcher_thread() == NULL, "dynamic enrollment of tasks not yet supported");
if (_num_tasks == PeriodicTask::max_tasks)
fatal("Overflow in PeriodicTask table");
_tasks[_num_tasks++] = this;
}
void PeriodicTask::disenroll() {
assert(WatcherThread::watcher_thread() == NULL ||
Thread::current() == WatcherThread::watcher_thread(),
"dynamic disenrollment currently only handled from WatcherThread from within task() method");
int index;
for(index = 0; index < _num_tasks && _tasks[index] != this; index++);
if (index == _num_tasks) return;
_num_tasks--;
for (; index < _num_tasks; index++) {
_tasks[index] = _tasks[index+1];
}
}
|
