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PsnPthreadSemaphore.cxx

Go to the documentation of this file.

/*
 * This file is part of openMask © INRIA, CNRS, Universite de Rennes 1 1993-2002, thereinafter the Software
 * 
 * The Software has been developped within the Siames Project. 
 * INRIA, the University of Rennes 1 and CNRS jointly hold intellectual property rights
 * 
 * The Software has been registered with the Agence pour la Protection des
 * Programmes (APP) under registration number IDDN.FR.001.510008.00.S.P.2001.000.41200
 *  
 * This file may be distributed under the terms of the Q Public License
 * version 1.0 as defined by Trolltech AS of Norway and appearing in the file
 * LICENSE.QPL included in the packaging of this file.
 *
 * Licensees holding valid specific licenses issued by INRIA, CNRS or Université de Rennes 1 
 * for the software may use this file in accordance with that specific license
 *
 */
#include <PsnPthreadSemaphore.h>
#include <stdio.h>

PsnPthreadSemaphore::PsnPthreadSemaphore(const int valeurInitiale)  : PsnSemaphore(valeurInitiale){
  int ret;
  _v=valeurInitiale;
  ret=pthread_mutex_init(&_mutex,NULL);
  if(ret) {
    perror("PsnPthreadSemaphore : impossible d'initialiser le mutex");
  }
  ret=pthread_cond_init(&_cond,NULL);
  if(ret) {
    perror("PsnPthreadSemaphore : impossible d'initialiser le cond");
  }
}

PsnPthreadSemaphore::~PsnPthreadSemaphore() {
  pthread_mutex_destroy(&_mutex);
  pthread_cond_destroy(&_cond);
}

int PsnPthreadSemaphore::V() {
  int retval,ret;
  ret=pthread_mutex_lock(&_mutex);
  if(ret) {
    perror("PsnPthreadSemaphore : V a echoue au niveau du mutex lock");
  }
  _v++;
  retval=_v;
  ret=pthread_mutex_unlock(&_mutex);
  if(ret) {
    perror("PsnPthreadSemaphore : V a echoue au niveau du mutex unlock");
  }
  ret=pthread_cond_signal(&_cond);
  if(ret) {
    perror("PsnPthreadSemaphore : V a echoue au niveau du cond");
  }
  return(retval);
}

int PsnPthreadSemaphore::P() {
  int retval,ret;
  ret=pthread_mutex_lock(&_mutex);
  if(ret) {
    perror("PsnPthreadSemaphore : P a echoue au niveau du mutex lock");
  }
  _v--;
  while(_v<0) {
    ret=pthread_cond_wait(&_cond,&_mutex);
    if(ret) {
      perror("PsnPthreadSemaphore : P a echoue au niveau du cond");
    }
  }
  retval=_v;
  ret=pthread_mutex_unlock(&_mutex);
  if(ret) {
    perror("PsnPthreadSemaphore : P a echoue au niveau du mutex unlock");
  }
  return (retval);
}

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