How to let a thread which blocks on recv() exit gracefully?

Question

There is a thread likes this:

{  
    ......    
    while (1)
    {
        recv(socket, buffer, sizeof(buffer), 0);
        ......
    }
    close(socket         


        

Answer 1

Declare some 'stop' boolean, check it after every recv() return and terminate if it's set. To shut down, set the bool and close the socket from another thread. The blocking recv() will return 'immediately' with an error, but it does not matter 'cos you're about to terminate anyway:)