如果列表原来是空的，就调用pthread_cond_broadcast以宣告列表中已经添加了数据。

If the list were originally empty, you call pthread_cond_broadcast to post push data into the list.

youdao

如果列表原来是空的，就调用pthread_cond_broadcast以宣告列表中已经添加了数据。

If the list were originally empty, you call pthread_cond_broadcast to post push data into the list.

youdao