Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/task.hpp @ 18096:ca6d25be853b jdk8u25-b13
8044269: Analysis of archive files.
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Reviewed-by: iklam, dholmes, mschoene
| author | jiangli |
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| date | Tue, 12 Aug 2014 17:46:16 -0400 |
| parents | c284cf4781f0 |
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| rev | line source |
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| 0 | 1 /* |
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2 * Copyright (c) 1997, 2012, 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 #ifndef SHARE_VM_RUNTIME_TASK_HPP |
| 26 #define SHARE_VM_RUNTIME_TASK_HPP | |
| 27 | |
| 28 #include "utilities/top.hpp" | |
| 29 | |
| 0 | 30 // A PeriodicTask has the sole purpose of executing its task |
| 31 // function with regular intervals. | |
| 32 // Usage: | |
| 33 // PeriodicTask pf(10); | |
| 34 // pf.enroll(); | |
| 35 // ... | |
| 36 // pf.disenroll(); | |
| 37 | |
| 6197 | 38 class PeriodicTask: public CHeapObj<mtInternal> { |
| 0 | 39 public: |
| 40 // Useful constants. | |
| 41 // The interval constants are used to ensure the declared interval | |
| 42 // is appropriate; it must be between min_interval and max_interval, | |
| 43 // and have a granularity of interval_gran (all in millis). | |
| 44 enum { max_tasks = 10, // Max number of periodic tasks in system | |
| 45 interval_gran = 10, | |
| 46 min_interval = 10, | |
| 47 max_interval = 10000 }; | |
| 48 | |
| 49 static int num_tasks() { return _num_tasks; } | |
| 50 | |
| 51 private: | |
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52 int _counter; |
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53 const int _interval; |
| 0 | 54 |
| 55 static int _num_tasks; | |
| 56 static PeriodicTask* _tasks[PeriodicTask::max_tasks]; | |
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57 static void real_time_tick(int delay_time); |
| 0 | 58 |
| 59 #ifndef PRODUCT | |
| 60 static elapsedTimer _timer; // measures time between ticks | |
| 61 static int _ticks; // total number of ticks | |
| 62 static int _intervalHistogram[max_interval]; // to check spacing of timer interrupts | |
| 63 public: | |
| 64 static void print_intervals(); | |
| 65 #endif | |
| 66 // Only the WatcherThread can cause us to execute PeriodicTasks | |
| 67 friend class WatcherThread; | |
| 68 public: | |
| 69 PeriodicTask(size_t interval_time); // interval is in milliseconds of elapsed time | |
| 70 ~PeriodicTask(); | |
| 71 | |
| 72 // Make the task active | |
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73 // For dynamic enrollment at the time T, the task will execute somewhere |
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74 // between T and T + interval_time. |
| 0 | 75 void enroll(); |
| 76 | |
| 77 // Make the task deactive | |
| 78 void disenroll(); | |
| 79 | |
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80 void execute_if_pending(int delay_time) { |
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81 // make sure we don't overflow |
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82 jlong tmp = (jlong) _counter + (jlong) delay_time; |
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83 |
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84 if (tmp >= (jlong) _interval) { |
| 0 | 85 _counter = 0; |
| 86 task(); | |
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87 } else { |
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88 _counter += delay_time; |
| 0 | 89 } |
| 90 } | |
| 91 | |
| 92 // Returns how long (time in milliseconds) before the next time we should | |
| 93 // execute this task. | |
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94 int time_to_next_interval() const { |
| 0 | 95 assert(_interval > _counter, "task counter greater than interval?"); |
| 96 return _interval - _counter; | |
| 97 } | |
| 98 | |
| 99 // Calculate when the next periodic task will fire. | |
| 100 // Called by the WatcherThread's run method. | |
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101 static int time_to_wait(); |
| 0 | 102 |
| 103 // The task to perform at each period | |
| 104 virtual void task() = 0; | |
| 105 }; | |
| 1972 | 106 |
| 107 #endif // SHARE_VM_RUNTIME_TASK_HPP |