????4???????????????

????1??????????????????????????

????2??????????????????????

????3???????????????????

????4??????卸????? ?????????ABC???????????????????ABC??

????5?????????????????????????????

????????????????

????1???????????

???????????????????????????芯???????????????

????a????????

?????????????PTHREAD_COND_INITIALIZER???????纾簆thread_cond_t  cond = PTHREAD_COND_INITIALIZER

????b????????

????int pthread_cond_init(pthread_cond_t *cond??pthread_condattr_t *cond_attr)

??????? cond_attr ????????????????????? cond???? cond_attr? NULL???????????????LinuxThreads???????????????????????? cond_attr?????????????

????c?????

????int pthread_cond_destroy(pthread_cond_t *cond)

?????????????????????????pthread_cond_destroy()??????????????????????????????????????????????????????????EBUSY?????Linux??????????????蟹?????????????????????????????????械??????

????2??????????

????2.1 ???

????int pthread_cond_wait(pthread_cond_t *cond?? pthread_mutex_t *mutex)

?????????????POSIX???????????????????????????????????????????-wait-??????-????-?????

????2.2 ??????????

????int pthread_cond_timedwait(pthread_cond_t *cond?? pthread_mutex_t *mutex?? conststruct timespec *abstime)

????pthread_cond_timedwait?? pthread_cond_wait?????????????????????????????????????????????????????? abstime?????????? cond未???????????? mutex???????????????????? ETIMEDOUT??abstime????????????????????? time?? gettimeofday?????abstime = 0??? 1970 ?? 1?? 1 ?? 00:00:00 GMT??

????2.3 ????

????int pthread_cond_signal(pthread_cond_t *cond);
????int pthread_cond_broadcast(pthread_cond_t *cond);

???????????????????????pthread_cond_signal()??????????????????????????????????????????????????????????????????????????????????????pthread_cond_broadcast()???????械????????些???????????尉???????????????

??????????????????????????????????????????????????????????????????锌?????????????????pthread_cond_wait()??????????????????????????????

????????????????????????

??????????????????????????????????????????????????????校??????????????????????????????????????????????????????????纾�??????????????????????????????????????????????????????????????????????????????味????楣�???????????????????????????????????????????????????????效????????????????渭????????????????????????????3s?????????????????????????????

??????????????????????????????????????????????????????????????????????????????????????????????谩????????????????????????????????????????????????????????????????????????????????浠�???????????????????????????????????????????????????????????????????????????????????????些???????????????????????2??????????????