/* $Id$ */ /** @file thread_pthread.cpp POSIX pthread implementation of Threads. */ #include "stdafx.h" #include "thread.h" #include <pthread.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 e) { } 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; public: ThreadMutex_pthread() { pthread_mutex_init(&this->mutex, NULL); } /* virtual */ ~ThreadMutex_pthread() { pthread_mutex_destroy(&this->mutex); } /* virtual */ void BeginCritical() { pthread_mutex_lock(&this->mutex); } /* virtual */ void EndCritical() { pthread_mutex_unlock(&this->mutex); } }; /* static */ ThreadMutex *ThreadMutex::New() { return new ThreadMutex_pthread(); }