pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
int pthread_mutex_init(pthread_mutex_t *mutex, pthread_mutexattr_t *attr);

int pthread_mutex_destory(pthread_mutex_t *mutex);

int pthread_mutex_lock(pthread_mutex_t *mutex);

int pthread_mutex_trylock(pthread_mutex_t *mutex);

int pthread_mutexunlock(pthread_mutex_t mutex);

pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
int pthread_cond_init(pthread_cond_t *cond, pthread_condattr_t *condattr);

int pthread_cond_destory(pthread_cond_t *cond);

int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex);

int pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t * mutex, timespec *expiration);

int pthread_cond_singal(pthread_cond_t *cond);

int pthread_cond_broadcast(pthread_cond_t *cond);