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thread yield problem

Started by stefu Jul 24, 2002 at 3:27 AM 4 replies 250+ views

Original Post

Jul 24, 2002 at 3:27 AM

Hi! Here's simple tight server loop with yield:

static void *mainServerLoop(void *s) {
    while(running) {
        // ...
        
        nlThreadYield();
    }
}

Then I have two cases:

CASE 1.

void main() {
    /* start the server thread */
    tid = nlThreadCreate(mainServerLoop, 0, NL_TRUE);
    nlThreadJoin(tid, (void **)&exitcode);
}


CASE 2.

void main() {
    /* run server without thread */
    mainServerLoop(0);
}

The problem is that case 1 eats up all processor time so that client application with 3d opengl graphics is damn slow. Also all other windows apps run very slow. However case 2 works much better. Why doesn't case 1 yield work to give time for other apps? Thanks. [edited by - stefu on July 24, 2002 4:28:33 AM]

Tornado

Jul 24, 2002 at 5:33 AM

Maybe you should try creating the new thread with a lower priority.

- Goblineye Entertainment
The road to success is always under construction

stefu

Author

stefu

Jul 24, 2002 at 5:43 AM

quote:
Original post by Tornado
Maybe you should try creating the new thread with a lower priority.

Ach, priorities? Didn''t think about them at all.

Thanks, I''ll try something.

stefu

Author

stefu

Jul 24, 2002 at 5:51 AM

Damn it, there''s no way to change thread priority in HawkNL or SDL

Tornado

Jul 24, 2002 at 7:19 AM

Well, I don''t have much experience with HawkNL (Just had a look at its docs), but any chance it could be nlThreadJoin() that''s causing the problem? The docs say that nlThreadJoin() doesn''t return until the thread you specify exists. Could be that it also steals cpu cycles while waiting?

- Goblineye Entertainment
The road to success is always under construction

stefu

Author

stefu

Jul 24, 2002 at 9:15 AM

Hi!
Propably it is so.

I looked at source code, but don''t know much.

If it uses windows threads then nlThreadJoin is just WaitForSingleObject((HANDLE)threadID, INFINITE);

Or if POSIX system is used then pthread_join((pthread_t)threadID, status);

I think I''m using POSIX threads because I need PthreadVCE.dll.

But that''s no problem anymore. I go on without joining thread for now.

Thanks.

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