If not, it sets the POST data to an empty string.
如果没有，POST数据设为空字符串。
If the list were originally empty, you call pthread_cond_broadcast to post push data into the list.
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。
You call it an "empty envelope" to emphasize that it should eventually contain a "letter" (perhaps a business letter) before you can send it by "post".
称其为“空envelope”是为了强调在通过“投递”发出它之前，它最终应该包含一封“信”(也许是商业信)。
One afternoon, he enters the post office two minutes before closing. The lobby is empty but for the postman and his broom.
一天下午，他在邮局关门前两分钟赶了进去。大厅里除了邮差和他的扫帚以外别无他人。
But he says last Saturday the post office was empty.
但是，他说上周六邮局空荡荡的。
It seems a secretary post is empty.
好像有个秘书职位是空着的。
It seems a secretary post is empty.
好像有个秘书职位是空着的。
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