Mercurial > hg > truffle
annotate src/share/vm/runtime/task.cpp @ 9099:ed81c74f92ff
Cache boolean flags instead of full Annotation objects
author | Christian Wimmer <christian.wimmer@oracle.com> |
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date | Fri, 12 Apr 2013 16:05:56 -0700 |
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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 * | |
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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" | |
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29 #include "runtime/thread.inline.hpp" |
1972 | 30 #include "runtime/timer.hpp" |
31 #ifdef TARGET_OS_FAMILY_linux | |
32 # include "os_linux.inline.hpp" | |
33 #endif | |
34 #ifdef TARGET_OS_FAMILY_solaris | |
35 # include "os_solaris.inline.hpp" | |
36 #endif | |
37 #ifdef TARGET_OS_FAMILY_windows | |
38 # include "os_windows.inline.hpp" | |
39 #endif | |
3960 | 40 #ifdef TARGET_OS_FAMILY_bsd |
41 # include "os_bsd.inline.hpp" | |
42 #endif | |
0 | 43 |
44 int PeriodicTask::_num_tasks = 0; | |
45 PeriodicTask* PeriodicTask::_tasks[PeriodicTask::max_tasks]; | |
46 #ifndef PRODUCT | |
47 elapsedTimer PeriodicTask::_timer; | |
48 int PeriodicTask::_intervalHistogram[PeriodicTask::max_interval]; | |
49 int PeriodicTask::_ticks; | |
50 | |
51 void PeriodicTask::print_intervals() { | |
52 if (ProfilerCheckIntervals) { | |
53 for (int i = 0; i < PeriodicTask::max_interval; i++) { | |
54 int n = _intervalHistogram[i]; | |
55 if (n > 0) tty->print_cr("%3d: %5d (%4.1f%%)", i, n, 100.0 * n / _ticks); | |
56 } | |
57 } | |
58 } | |
59 #endif | |
60 | |
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61 void PeriodicTask::real_time_tick(int delay_time) { |
0 | 62 #ifndef PRODUCT |
63 if (ProfilerCheckIntervals) { | |
64 _ticks++; | |
65 _timer.stop(); | |
66 int ms = (int)(_timer.seconds() * 1000.0); | |
67 _timer.reset(); | |
68 _timer.start(); | |
69 if (ms >= PeriodicTask::max_interval) ms = PeriodicTask::max_interval - 1; | |
70 _intervalHistogram[ms]++; | |
71 } | |
72 #endif | |
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73 |
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74 { |
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75 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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76 int orig_num_tasks = _num_tasks; |
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77 |
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78 for(int index = 0; index < _num_tasks; index++) { |
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79 _tasks[index]->execute_if_pending(delay_time); |
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80 if (_num_tasks < orig_num_tasks) { // task dis-enrolled itself |
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81 index--; // re-do current slot as it has changed |
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82 orig_num_tasks = _num_tasks; |
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83 } |
0 | 84 } |
85 } | |
86 } | |
87 | |
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88 int PeriodicTask::time_to_wait() { |
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89 MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ? |
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90 NULL : PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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91 |
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92 if (_num_tasks == 0) { |
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93 return 0; // sleep until shutdown or a task is enrolled |
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94 } |
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95 |
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96 int delay = _tasks[0]->time_to_next_interval(); |
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97 for (int index = 1; index < _num_tasks; index++) { |
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98 delay = MIN2(delay, _tasks[index]->time_to_next_interval()); |
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99 } |
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100 return delay; |
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101 } |
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102 |
0 | 103 |
104 PeriodicTask::PeriodicTask(size_t interval_time) : | |
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105 _counter(0), _interval((int) interval_time) { |
0 | 106 // Sanity check the interval time |
107 assert(_interval >= PeriodicTask::min_interval && | |
108 _interval <= PeriodicTask::max_interval && | |
109 _interval % PeriodicTask::interval_gran == 0, | |
110 "improper PeriodicTask interval time"); | |
111 } | |
112 | |
113 PeriodicTask::~PeriodicTask() { | |
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114 disenroll(); |
0 | 115 } |
116 | |
117 void PeriodicTask::enroll() { | |
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118 MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ? |
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119 NULL : PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
0 | 120 |
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121 if (_num_tasks == PeriodicTask::max_tasks) { |
0 | 122 fatal("Overflow in PeriodicTask table"); |
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123 } |
0 | 124 _tasks[_num_tasks++] = this; |
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125 |
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126 WatcherThread* thread = WatcherThread::watcher_thread(); |
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127 if (thread) { |
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128 thread->unpark(); |
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129 } else { |
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130 WatcherThread::start(); |
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131 } |
0 | 132 } |
133 | |
134 void PeriodicTask::disenroll() { | |
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135 MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ? |
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136 NULL : PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
0 | 137 |
138 int index; | |
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139 for(index = 0; index < _num_tasks && _tasks[index] != this; index++) |
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140 ; |
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141 |
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142 if (index == _num_tasks) { |
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143 return; |
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144 } |
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145 |
0 | 146 _num_tasks--; |
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147 |
0 | 148 for (; index < _num_tasks; index++) { |
149 _tasks[index] = _tasks[index+1]; | |
150 } | |
151 } |