Question

I have a thread like this:

DWORD WINAPI message_loop_thread(LPVOID dummy) {
        MSG message;
        while (GetMessage(&message, NULL, 0, 0)) {
                TranslateMessage(&message);
                DispatchMessage(&message);
        }
}

And i start it with CreateThread:

DWORD thread_id;
CreateThread(0, 0, message_loop_thread, 0, 0, &thread_id);

This seems to work, but how can i correctly close this thread? Normally the thread is waiting for GetMessage so the thread is blocked i think.

Is there a good way to do this? I tried TerminateThread, but this hangs, and i think it’s not a good solution to stop the thread.

Has someone an idea?

best regards
Benj Meier

Answer 1

The proper way is to post WM_QUIT to thread_id. You use PostThreadMessage() for this. In response, GetMessage returns 0, the while loop exits, and the function exits (incorrectly, you’re missing a return statement). When the toplevel function of a thread exits, the thread ends.