成功启动一个重叠操作，过后将有完成指示。
An overlapped operation was successfully initiated and completion will be indicated at a later time.
在这个套接字上进行的任何重叠操作都将通过完成端口发出完成通知。
Any overlapped operations performed on the socket will use the completion port for notification.
当达到上限时，重叠操作将失败，并发送WSAENOBUFS错误。
When this limit is reached, the overlapped operations will fail with the WSAENOBUFS error.
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