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147 lines
3 KiB
C++
147 lines
3 KiB
C++
/*
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* Copyright (c) 2005, Eric Crahen
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is furnished
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* to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*/
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#include "ThreadOps.h"
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#include "zthread/Guard.h"
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#include "zthread/Runnable.h"
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#include <errno.h>
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#if defined(HAVE_SCHED_YIELD)
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# include <sched.h>
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#endif
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namespace ZThread {
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const ThreadOps ThreadOps::INVALID(0);
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bool ThreadOps::join(ThreadOps* ops) {
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assert(ops);
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assert(ops->_tid != 0);
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int err = 0;
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do {
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err = pthread_join(ops->_tid, NULL);
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} while(err == EINTR);
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return err == 0;
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}
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bool ThreadOps::yield() {
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bool result = false;
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#if defined(HAVE_SCHED_YIELD)
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result = sched_yield() == 0;
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#endif
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return result;
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}
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bool ThreadOps::setPriority(ThreadOps* impl, Priority p) {
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assert(impl);
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bool result = true;
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#if !defined(ZTHREAD_DISABLE_PRIORITY)
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struct sched_param param;
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switch(p) {
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case Low:
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param.sched_priority = 0;
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break;
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case High:
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param.sched_priority = 10;
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break;
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case Medium:
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default:
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param.sched_priority = 5;
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}
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result = pthread_setschedparam(impl->_tid, SCHED_OTHER, ¶m) == 0;
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#endif
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return result;
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}
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bool ThreadOps::getPriority(ThreadOps* impl, Priority& p) {
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assert(impl);
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bool result = true;
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#if !defined(ZTHREAD_DISABLE_PRIORITY)
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struct sched_param param;
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int policy = SCHED_OTHER;
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if(result = (pthread_getschedparam(impl->_tid, &policy, ¶m) == 0)) {
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// Convert to one of the PRIORITY values
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if(param.sched_priority < 10)
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p = Low;
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else if(param.sched_priority == 10)
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p = Medium;
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else
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p = High;
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}
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#endif
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return result;
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}
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bool ThreadOps::spawn(Runnable* task) {
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return pthread_create(&_tid, 0, _dispatch, task) == 0;
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}
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extern "C" void *_dispatch(void *arg) {
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Runnable* task = reinterpret_cast<Runnable*>(arg);
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assert(task);
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// Run the task from the correct context
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task->run();
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// Exit the thread
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pthread_exit((void**)0);
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return (void*)0;
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}
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} // namespace ZThread
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