/* $Id$ */ /* * This file is part of OpenTTD. * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2. * OpenTTD 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 for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>. */ /** @file thread_pthread.cpp POSIX pthread implementation of Threads. */ #include "../stdafx.h" #include "thread.h" #include <pthread.h> #include <errno.h> /** * POSIX pthread version for ThreadObject. */ class ThreadObject_pthread : public ThreadObject { private: pthread_t thread; ///< System thread identifier. OTTDThreadFunc proc; ///< External thread procedure. void *param; ///< Parameter for the external thread procedure. bool self_destruct; ///< Free ourselves when done? public: /** * Create a pthread and start it, calling proc(param). */ ThreadObject_pthread(OTTDThreadFunc proc, void *param, bool self_destruct) : thread(0), proc(proc), param(param), self_destruct(self_destruct) { pthread_create(&this->thread, NULL, &stThreadProc, this); } /* virtual */ bool Exit() { assert(pthread_self() == this->thread); /* For now we terminate by throwing an error, gives much cleaner cleanup */ throw OTTDThreadExitSignal(); } /* virtual */ void Join() { /* You cannot join yourself */ assert(pthread_self() != this->thread); pthread_join(this->thread, NULL); this->thread = 0; } private: /** * On thread creation, this function is called, which calls the real startup * function. This to get back into the correct instance again. */ static void *stThreadProc(void *thr) { ((ThreadObject_pthread *)thr)->ThreadProc(); pthread_exit(NULL); } /** * A new thread is created, and this function is called. Call the custom * function of the creator of the thread. */ void ThreadProc() { /* Call the proc of the creator to continue this thread */ try { this->proc(this->param); } catch (OTTDThreadExitSignal) { } catch (...) { NOT_REACHED(); } if (self_destruct) { pthread_detach(pthread_self()); delete this; } } }; /* static */ bool ThreadObject::New(OTTDThreadFunc proc, void *param, ThreadObject **thread) { ThreadObject *to = new ThreadObject_pthread(proc, param, thread == NULL); if (thread != NULL) *thread = to; return true; } /** * POSIX pthread version of ThreadMutex. */ class ThreadMutex_pthread : public ThreadMutex { private: pthread_mutex_t mutex; ///< The actual mutex. pthread_cond_t condition; ///< Data for conditional waiting. pthread_mutexattr_t attr; ///< Attributes set for the mutex. public: ThreadMutex_pthread() { pthread_mutexattr_init(&this->attr); pthread_mutexattr_settype(&this->attr, PTHREAD_MUTEX_ERRORCHECK); pthread_mutex_init(&this->mutex, &this->attr); pthread_cond_init(&this->condition, NULL); } /* virtual */ ~ThreadMutex_pthread() { int err = pthread_cond_destroy(&this->condition); assert(err != EBUSY); err = pthread_mutex_destroy(&this->mutex); assert(err != EBUSY); } /* virtual */ void BeginCritical() { int err = pthread_mutex_lock(&this->mutex); assert(err == 0); } /* virtual */ void EndCritical() { int err = pthread_mutex_unlock(&this->mutex); assert(err == 0); } /* virtual */ void WaitForSignal() { int err = pthread_cond_wait(&this->condition, &this->mutex); assert(err == 0); } /* virtual */ void SendSignal() { int err = pthread_cond_signal(&this->condition); assert(err == 0); } }; /* static */ ThreadMutex *ThreadMutex::New() { return new ThreadMutex_pthread(); }