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#include <pthread.h>
int pthread_cond_init(pthread_cond_t *restrict cond;
                                   const pthread_condattr_t *restrict attr);
int pthread_cond_destroy(pthread_cond_t *cond);
int pthread_cond_wait(pthread_cond_t *restrict cond,
                                     pthread_mutex_t *restrict mutex,
                                     const struct timespec *restrict tsptr);

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#include <pthread,h>
int pthread_mutex_init(pthread_mutex_t *restrict mutex,
                                      const pthread_mutexattr_t *restrict attr);

int pthread_mutex_destroy(pthread_mutex_t *mutex);

int pthread_mutex_lock(pthread_mutex_t *mutex);
//对互斥量加锁，如果已经加锁，线程阻塞直至被解锁
int pthread_mutex_trylock(pthread_mutex_t *mutex);
//如果已经加锁，不会阻塞，而是返回EBUSY
int pthread_mutex_unlock(pthread_mutex_t *mutex);

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[capture list](parameter list) -> return type { function body}
//必须使用尾置返回