从插座突破选择 [英] breaking out from socket select

问题描述

我有一个循环，基本上调用此每隔几秒钟（超时后）：

I have a loop which basically calls this every few seconds (after the timeout):

 while(true){

    if(finished)
       return;

    switch(select(FD_SETSIZE, &readfds, 0, 0, &tv)){
        case SOCKET_ERROR : report bad stuff etc; return;
        default : break;
    }

    // do stuff with the incoming connection
 }

因此​​，基本上每隔几秒（这是由电视指定）为，它重新激活监听。

So basically for every few seconds (which is specified by tv), it reactivates the listening.

这是在线程B（而不是主线程）运行。有些时候，我想从线程A（主线程）立即停止这种受体循环，但好像我不得不等待，直到时间间隔结束。

This is run on thread B (not a main thread). There are times when I want to end this acceptor loop immediately from thread A (main thread), but seems like I have to wait until the time interval finishes..

有没有办法破坏从另一个线程的选择功能，使线程B可以立即退出？

Is there a way to disrupt the select function from another thread so thread B can quit instantly?

推荐答案

最简单的方法可能是使用管（2）以创建一个管道，并添加读端到 readfds 。当其他线程要中断选择（）只写它一个字节，然后使用它之后。

The easiest way is probably to use pipe(2) to create a pipe and add the read end to readfds. When the other thread wants to interrupt the select() just write a byte to it, then consume it afterward.

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