# thread_pthread.cpp

Go to the documentation of this file.

    00001 /* $Id: thread_pthread.cpp 22405 2011-05-01 19:14:12Z rubidium $ */
    00002
    00003 /*
    00004  * This file is part of OpenTTD.
    00005  * 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.
    00006  * 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.
    00007  * 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/>.
    00008  */
    00009
    00012 #include "../stdafx.h"
    00013 #include "thread.h"
    00014 #include <pthread.h>
    00015 #include <errno.h>
    00016
    00020 class ThreadObject_pthread : public ThreadObject {
    00021 private:
    00022   pthread_t thread;
    00023   OTTDThreadFunc proc;
    00024   void *param;
    00025   bool self_destruct;
    00026
    00027 public:
    00031   ThreadObject_pthread(OTTDThreadFunc proc, void *param, bool self_destruct) :
    00032     thread(0),
    00033     proc(proc),
    00034     param(param),
    00035     self_destruct(self_destruct)
    00036   {
    00037     pthread_create(&this->thread, NULL, &stThreadProc, this);
    00038   }
    00039
    00040   /* virtual */ bool Exit()
    00041   {
    00042     assert(pthread_self() == this->thread);
    00043     /* For now we terminate by throwing an error, gives much cleaner cleanup */
    00044     throw OTTDThreadExitSignal();
    00045   }
    00046
    00047   /* virtual */ void Join()
    00048   {
    00049     /* You cannot join yourself */
    00050     assert(pthread_self() != this->thread);
    00051     pthread_join(this->thread, NULL);
    00052     this->thread = 0;
    00053   }
    00054 private:
    00059   static void *stThreadProc(void *thr)
    00060   {
    00061     ((ThreadObject_pthread *)thr)->ThreadProc();
    00062     pthread_exit(NULL);
    00063   }
    00064
    00069   void ThreadProc()
    00070   {
    00071     /* Call the proc of the creator to continue this thread */
    00072     try {
    00073       this->proc(this->param);
    00074     } catch (OTTDThreadExitSignal) {
    00075     } catch (...) {
    00076       NOT_REACHED();
    00077     }
    00078
    00079     if (self_destruct) {
    00080       pthread_detach(pthread_self());
    00081       delete this;
    00082     }
    00083   }
    00084 };
    00085
    00086 /* static */ bool ThreadObject::New(OTTDThreadFunc proc, void *param, ThreadObject **thread)
    00087 {
    00088   ThreadObject *to = new ThreadObject_pthread(proc, param, thread == NULL);
    00089   if (thread != NULL) *thread = to;
    00090   return true;
    00091 }
    00092
    00096 class ThreadMutex_pthread : public ThreadMutex {
    00097 private:
    00098   pthread_mutex_t mutex;
    00099   pthread_cond_t condition;
    00100   pthread_mutexattr_t attr;
    00101
    00102 public:
    00103   ThreadMutex_pthread()
    00104   {
    00105     pthread_mutexattr_init(&this->attr);
    00106     pthread_mutexattr_settype(&this->attr, PTHREAD_MUTEX_ERRORCHECK);
    00107     pthread_mutex_init(&this->mutex, &this->attr);
    00108     pthread_cond_init(&this->condition, NULL);
    00109   }
    00110
    00111   /* virtual */ ~ThreadMutex_pthread()
    00112   {
    00113     int err = pthread_cond_destroy(&this->condition);
    00114     assert(err != EBUSY);
    00115     err = pthread_mutex_destroy(&this->mutex);
    00116     assert(err != EBUSY);
    00117   }
    00118
    00119   /* virtual */ void BeginCritical()
    00120   {
    00121     int err = pthread_mutex_lock(&this->mutex);
    00122     assert(err == 0);
    00123   }
    00124
    00125   /* virtual */ void EndCritical()
    00126   {
    00127     int err = pthread_mutex_unlock(&this->mutex);
    00128     assert(err == 0);
    00129   }
    00130
    00131   /* virtual */ void WaitForSignal()
    00132   {
    00133     int err = pthread_cond_wait(&this->condition, &this->mutex);
    00134     assert(err == 0);
    00135   }
    00136
    00137   /* virtual */ void SendSignal()
    00138   {
    00139     int err = pthread_cond_signal(&this->condition);
    00140     assert(err == 0);
    00141   }
    00142 };
    00143
    00144 /* static */ ThreadMutex *ThreadMutex::New()
    00145 {
    00146   return new ThreadMutex_pthread();
    00147 }