問題描述
我有一個(gè)循環(huán)，它基本上每隔幾秒(超時(shí)后)調(diào)用一次:
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
}
所以基本上每隔幾秒鐘(由電視指定)，它就會(huì)重新激活聆聽.
So basically for every few seconds (which is specified by tv), it reactivates the listening.
這是在線程 B(不是主線程)上運(yùn)行的.有時(shí)我想從線程 A(主線程)立即結(jié)束這個(gè)接受器循環(huán)，但似乎我必須等到時(shí)間間隔結(jié)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..
有沒有辦法從另一個(gè)線程中斷 select 函數(shù)，以便線程 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?
推薦答案
最簡(jiǎn)單的方法大概是使用 pipe(2) 創(chuàng)建一個(gè)管道并將讀取端添加到 readfds.當(dāng)另一個(gè)線程想要中斷 select() 時(shí)，只需向它寫入一個(gè)字節(jié)，然后再消費(fèi)它.
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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