Mercurial > hg > truffle
annotate src/share/vm/runtime/task.cpp @ 2442:c2323e2ea62b
6385687: UseFastEmptyMethods/UseFastAccessorMethods considered harmful
Reviewed-by: kvn, jrose, phh
author | never |
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date | Thu, 31 Mar 2011 21:05:55 -0700 |
parents | f95d63e2154a |
children | f08d439fab8c |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
1552
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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. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "memory/allocation.hpp" | |
27 #include "runtime/init.hpp" | |
28 #include "runtime/task.hpp" | |
29 #include "runtime/timer.hpp" | |
30 #ifdef TARGET_OS_FAMILY_linux | |
31 # include "os_linux.inline.hpp" | |
32 # include "thread_linux.inline.hpp" | |
33 #endif | |
34 #ifdef TARGET_OS_FAMILY_solaris | |
35 # include "os_solaris.inline.hpp" | |
36 # include "thread_solaris.inline.hpp" | |
37 #endif | |
38 #ifdef TARGET_OS_FAMILY_windows | |
39 # include "os_windows.inline.hpp" | |
40 # include "thread_windows.inline.hpp" | |
41 #endif | |
0 | 42 |
43 int PeriodicTask::_num_tasks = 0; | |
44 PeriodicTask* PeriodicTask::_tasks[PeriodicTask::max_tasks]; | |
45 #ifndef PRODUCT | |
46 elapsedTimer PeriodicTask::_timer; | |
47 int PeriodicTask::_intervalHistogram[PeriodicTask::max_interval]; | |
48 int PeriodicTask::_ticks; | |
49 | |
50 void PeriodicTask::print_intervals() { | |
51 if (ProfilerCheckIntervals) { | |
52 for (int i = 0; i < PeriodicTask::max_interval; i++) { | |
53 int n = _intervalHistogram[i]; | |
54 if (n > 0) tty->print_cr("%3d: %5d (%4.1f%%)", i, n, 100.0 * n / _ticks); | |
55 } | |
56 } | |
57 } | |
58 #endif | |
59 | |
60 void PeriodicTask::real_time_tick(size_t delay_time) { | |
61 #ifndef PRODUCT | |
62 if (ProfilerCheckIntervals) { | |
63 _ticks++; | |
64 _timer.stop(); | |
65 int ms = (int)(_timer.seconds() * 1000.0); | |
66 _timer.reset(); | |
67 _timer.start(); | |
68 if (ms >= PeriodicTask::max_interval) ms = PeriodicTask::max_interval - 1; | |
69 _intervalHistogram[ms]++; | |
70 } | |
71 #endif | |
72 int orig_num_tasks = _num_tasks; | |
73 for(int index = 0; index < _num_tasks; index++) { | |
74 _tasks[index]->execute_if_pending(delay_time); | |
75 if (_num_tasks < orig_num_tasks) { // task dis-enrolled itself | |
76 index--; // re-do current slot as it has changed | |
77 orig_num_tasks = _num_tasks; | |
78 } | |
79 } | |
80 } | |
81 | |
82 | |
83 PeriodicTask::PeriodicTask(size_t interval_time) : | |
84 _counter(0), _interval(interval_time) { | |
85 // Sanity check the interval time | |
86 assert(_interval >= PeriodicTask::min_interval && | |
87 _interval <= PeriodicTask::max_interval && | |
88 _interval % PeriodicTask::interval_gran == 0, | |
89 "improper PeriodicTask interval time"); | |
90 } | |
91 | |
92 PeriodicTask::~PeriodicTask() { | |
93 if (is_enrolled()) | |
94 disenroll(); | |
95 } | |
96 | |
97 bool PeriodicTask::is_enrolled() const { | |
98 for(int index = 0; index < _num_tasks; index++) | |
99 if (_tasks[index] == this) return true; | |
100 return false; | |
101 } | |
102 | |
103 void PeriodicTask::enroll() { | |
104 assert(WatcherThread::watcher_thread() == NULL, "dynamic enrollment of tasks not yet supported"); | |
105 | |
106 if (_num_tasks == PeriodicTask::max_tasks) | |
107 fatal("Overflow in PeriodicTask table"); | |
108 _tasks[_num_tasks++] = this; | |
109 } | |
110 | |
111 void PeriodicTask::disenroll() { | |
112 assert(WatcherThread::watcher_thread() == NULL || | |
113 Thread::current() == WatcherThread::watcher_thread(), | |
114 "dynamic disenrollment currently only handled from WatcherThread from within task() method"); | |
115 | |
116 int index; | |
117 for(index = 0; index < _num_tasks && _tasks[index] != this; index++); | |
118 if (index == _num_tasks) return; | |
119 _num_tasks--; | |
120 for (; index < _num_tasks; index++) { | |
121 _tasks[index] = _tasks[index+1]; | |
122 } | |
123 } |