/**
 * File:      Mutex.cc
 * Project:   libvdr - classes taken from vdr-project
 * 
 * from "Video Disk Recorder":
 * 
 * Copyright (C) 2000, 2003, 2006, 2008 Klaus Schmidinger
 * 
 * This program 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; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program 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.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 * Or, point your browser to http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * 
 * The original author can be reached at kls@tvdr.de
 * 
 * The vdr project's page is at http://www.tvdr.de
 * 
 */
#include <Mutex.h>

cMutex::cMutex(void)
{
  locked = 0;
  pthread_mutexattr_t attr;
  pthread_mutexattr_init(&attr);
  pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK_NP);
  pthread_mutex_init(&mutex, &attr);
}

cMutex::~cMutex()
{
  pthread_mutex_destroy(&mutex);
}

void cMutex::Lock(void)
{
  pthread_mutex_lock(&mutex);
  locked++;
}

void cMutex::Unlock(void)
{
 if (!--locked)
    pthread_mutex_unlock(&mutex);
}

// --- cMutexLock ------------------------------------------------------------

cMutexLock::cMutexLock(cMutex *Mutex)
{
  mutex = NULL;
  locked = false;
  Lock(Mutex);
}

cMutexLock::~cMutexLock()
{
  if (mutex && locked)
     mutex->Unlock();
}

bool cMutexLock::Lock(cMutex *Mutex)
{
  if (Mutex && !mutex) {
     mutex = Mutex;
     Mutex->Lock();
     locked = true;
     return true;
     }
  return false;
}