/** @file common/mutex.cpp
    
    Implementace hlavickoveho souboru common/mutex.h

    @author Petr Wolf
*/

#include "common/mutex.h"
#include "common/exc.h"

TMutex::TMutex()
{
  mutex = SDL_CreateMutex();
  if ( mutex== NULL )
  {
    THROW(E_8K,"Cannot create the mutex"); 
  }
}

TMutex::~TMutex()
{
  if (mutex)
    SDL_DestroyMutex(mutex);
  mutex = NULL;
}

int TMutex::lock()
{
  if ( SDL_mutexP(mutex) < 0 ) 
  {
    THROW(E_8K,"Cannot lock the mutex"); 
  }
  return 0;
}

int TMutex::unlock()
{
  if ( SDL_mutexV(mutex) < 0 ) 
  {
    THROW(E_8K,"Cannot unlock the mutex"); 
  }
  return 0;
}