然后还想了解MessageQ_get()成功完成调用的机制。是msg里面的内容有了变化?
文档中写道:If a message is present, it returned by this function. In this case the ISync's wait() function is not called.
什么情况才算是present?
然后还想了解MessageQ_get()成功完成调用的机制。是msg里面的内容有了变化?
文档中写道:If a message is present, it returned by this function. In this case the ISync's wait() function is not called.
什么情况才算是present?