#define MAX_MUTEXES 10

#define TIME_QUANTA_S 0
#define TIME_QUANTA_NS 250000000

int run_scheduler( pthread_t * thread, void *(*start_routine)(void *), void * arg);

int create_thread(pthread_t * thread, void *(*start_routine)(void *), void * arg);

int mutex_lock(int mutex_number);

int mutex_unlock(int mutex_number);