套接字关闭时取消阻止接收 [英] Unblock recvfrom when socket is closed

问题描述

比方说，我启动了一个线程以在端口上进行接收.套接字调用将在recvfrom上阻止. 然后，以某种方式在另一个线程中，关闭套接字.

Let's say I start a thread to receive on a port. The socket call will block on recvfrom. Then, somehow in another thread, I close the socket.

在Windows上，这将取消阻止recvfrom，并且我的线程执行将终止.

On Windows, this will unblock recvfrom and my thread execution will terminate.

在Linux上，这不会取消阻止recvfrom，因此，我的线程永远坐着不动，并且线程执行不会终止.

On Linux, this does not unblock recvfrom, and as a result, my thread is sitting doing nothing forever, and the thread execution does not terminate.

有人可以帮助我了解Linux上发生的情况吗?当套接字关闭时，我希望recvfrom取消阻止

Can anyone help me with what's happening on Linux? When the socket is closed, I want recvfrom to unblock

我一直在阅读有关使用select()的知识，但我不知道如何在特定情况下使用它.

I keep reading about using select(), but I don't know how to use it for my specific case.

推荐答案

在套接字上调用shutdown(sock, SHUT_RDWR)，然后等待线程退出. (即pthread_join).

Call shutdown(sock, SHUT_RDWR) on the socket, then wait for the thread to exit. (i.e. pthread_join).

您会认为close()会解除对recvfrom()的阻止，但在Linux上不会.

You would think that close() would unblock the recvfrom(), but it doesn't on linux.

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