#include <mutex.h>


Mutex::Mutex() 
{
  pthread_mutex_init( &mutex_var, NULL);
  locked = false;
}



Mutex::~Mutex() 
{
  if( locked == true)
    pthread_mutex_unlock( &mutex_var);

  pthread_mutex_destroy( &mutex_var);

}

// Returns 0 on success
int Mutex::P(void) {
	locked = true;
	return pthread_mutex_lock( &mutex_var);
}


// Returns 0 on success
int Mutex::V(void) {
	if ( locked == true )
		return pthread_mutex_unlock( &mutex_var);
	else
		return -1;

}