semaphore.h

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typedef void *sem_t;

struct timespec {
        time_t tv_sec; 
        long tv_nsec; 
};

extern int sem_init(sem_t *sem, int pshared, unsigned int value);

extern int sem_destroy(sem_t *sem);

extern int sem_post(sem_t *sem);

extern int sem_wait(sem_t *sem);

extern int sem_trywait(sem_t *sem);

extern int sem_timedwait(sem_t *sem, const struct timespec *abs_timeout);

extern int sem_getvalue(sem_t *sem, int *val);