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PsnSemaphore.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 <PsnSemaphore.h>

#ifdef _SPROC
PsnSemaphore::PsnSemaphore(const int valeurInitiale) {
  if(sem_init(&semaphore,0, valeurInitiale)) {
    perror("PsnSemaphore : constructeur : impossible de creer le semaphore");
    exit(0);
  }
}

PsnSemaphore::~PsnSemaphore() {
  sem_destroy(&semaphore);
}

int PsnSemaphore::V() {
  int ret;
#ifdef _DEBUG
  cout <<"V "<<endl;
#endif
  ret=sem_post(&semaphore);
  if(ret) {
    perror("PsnSemaphore : v() a échoué");
    exit(0);
  }
  return(ret);
}

int PsnSemaphore::P() {
  int ret;
#ifdef _DEBUG
  cout <<"P ";
#endif
  ret=sem_wait(&semaphore);
  if(ret) {
    perror("PsnSemaphore : P a echoue");
  }
#ifdef _DEBUG
  cout<<ret<<";"<<endl;
#endif
  return (ret);
}

#else
PsnSemaphore::PsnSemaphore(const int valeurInitiale) {
  int ret;
  v=valeurInitiale;
  ret=pthread_mutex_init(&mutex,NULL);
  if(ret) {
    perror("PsnSemaphore : impossible d'initialiser le mutex");
  }
  ret=pthread_cond_init(&cond,NULL);
  if(ret) {
    perror("PsnSemaphore : impossible d'initialiser le cond");
  }
}

PsnSemaphore::~PsnSemaphore() {
  pthread_mutex_destroy(&mutex);
  pthread_cond_destroy(&cond);
}

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

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

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