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  1. /***************************************************************************
  2.  *   Copyright (C) November 29, 2008 by Mattias Runge                             *
  3.  *   mattias@runge.se                                                      *
  4.  *   semaphore.h                                            *
  5.  *                                                                         *
  6.  *   This program is free software; you can redistribute it and/or modify  *
  7.  *   it under the terms of the GNU General Public License as published by  *
  8.  *   the Free Software Foundation; either version 2 of the License, or     *
  9.  *   (at your option) any later version.                                   *
  10.  *                                                                         *
  11.  *   This program is distributed in the hope that it will be useful,       *
  12.  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  13.  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  14.  *   GNU General Public License for more details.                          *
  15.  *                                                                         *
  16.  *   You should have received a copy of the GNU General Public License     *
  17.  *   along with this program; if not, write to the                         *
  18.  *   Free Software Foundation, Inc.,                                       *
  19.  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  20.  ***************************************************************************/
  21.  
  22. #ifndef _SEMAPHORE_H
  23. #define _SEMAPHORE_H
  24.  
  25. #include "mutex.h"
  26. #include <sys/time.h>
  27.  
  28. class Semaphore : public Mutex
  29. {
  30. public:
  31.     Semaphore() { pthread_cond_init(&myCondition, NULL); };
  32.     ~Semaphore() { pthread_cond_destroy(&myCondition); };
  33.  
  34.     int broadcast() { return pthread_cond_broadcast(&myCondition); };
  35.     int wait() { return pthread_cond_wait(&myCondition, &myMutex); };
  36.     int wait(int timeout) // Returns ETIMEDOUT on timeout
  37.     {
  38.         struct timeval timeval;
  39.  
  40.         gettimeofday(&timeval, NULL);
  41.  
  42.          /* Convert from timeval to timespec */
  43.         myTimespec.tv_sec  = timeval.tv_sec;
  44.         myTimespec.tv_nsec = timeval.tv_usec * 1000;
  45.         myTimespec.tv_sec += timeout;
  46.  
  47.         return pthread_cond_timedwait(&myCondition, &myMutex, &myTimespec);
  48.     }
  49.  
  50. protected:
  51.     pthread_cond_t myCondition;
  52.     struct timespec myTimespec;
  53.    
  54. };
  55.  
  56.  
  57. #endif  /* _SEMAPHORE_H */
  58.  
  59.