| /* |
| * Copyright 1997-2007 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]; |
| } |
| } |
| |
| TimeMillisUpdateTask* TimeMillisUpdateTask::_task = NULL; |
| |
| void TimeMillisUpdateTask::task() { |
| os::update_global_time(); |
| } |
| |
| void TimeMillisUpdateTask::engage() { |
| assert(_task == NULL, "init twice?"); |
| os::update_global_time(); // initial update |
| os::enable_global_time(); |
| _task = new TimeMillisUpdateTask(CacheTimeMillisGranularity); |
| _task->enroll(); |
| } |
| |
| void TimeMillisUpdateTask::disengage() { |
| assert(_task != NULL, "uninit twice?"); |
| os::disable_global_time(); |
| _task->disenroll(); |
| delete _task; |
| _task = NULL; |
| } |