pthread_create returns error code 11

Discussion in 'C++' started by Joy, May 27, 2009.

  1. Joy

    Joy Guest

    i have a code that uses pthread, but when i use pthread_create()
    method it returns error code 11. I have found out that this is often
    because of exceeding the THREAD_MAX limit for the process. But i want
    to use only about 24 threads at a given time, and i destroy the
    threads (or atleast i thought so) can someone tell me what i am doing
    wrong here it would be of great help! thanks!

    for (i=0; i<no_pairs; ){
    for (j=0; j<MAX_THREADS && i<no_pairs; j++,i++){
    data[j].a = seeds[i/no_seeds];
    data[j].b = seeds[i%no_seeds];
    data[j].N = N;
    data[j].L = nones+nzeros;
    data[j].p1 = get_string (seeds[i/no_seeds], nzeros
    data[j].p2 = get_string (seeds[i%no_seeds], nzeros
    data[j].results = pairs;
    rc = pthread_create (&threads[j], &attr, run_actree, (void
    if (rc) {
    printf ("ERROR; return code from pthread_create() is %d
    \n", rc);
    exit (-1);
    for (k=0; k<j; k++){
    rc = pthread_join (threads[k], &status);
    if (rc) {
    printf("ERROR; return code from pthread_join() is %d
    \n", rc);

    pthread_attr_destroy (&attr);

    Above is the main loop i create threads in, MAX_THREADS = 24

    Any help as to where i am going wrong is greatly appreciated.
    Joy, May 27, 2009
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  2. First off, 24 threads sounds like an awful lot to me.
    Is there any particular reason you need so many? Because unless you are
    working on a serious multi-processor/multi-core machine, there is no way
    that this many threads is going to buy you anything in processor

    It might be helpful in understanding when the error occurs to print i
    and j as well.
    My guess is that the value of MAX_THREADS also includes the thread that
    is spawning all the others. If that is so, the failure will occur at

    Bart v Ingen Schenau
    Bart van Ingen Schenau, May 27, 2009
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