#include <liblockdep/mutex.h>
  #include "common.h"
  
  void main(void)
  {
  	pthread_mutex_t a, b, c, d;
  
  	pthread_mutex_init(&a, NULL);
  	pthread_mutex_init(&b, NULL);
  	pthread_mutex_init(&c, NULL);
  	pthread_mutex_init(&d, NULL);
  
  	LOCK_UNLOCK_2(a, b);
  	LOCK_UNLOCK_2(b, c);
  	LOCK_UNLOCK_2(c, d);
  	LOCK_UNLOCK_2(d, a);
  }