c - pthread_cond_timedwait()

Question

void wait(int timeInMs)
{
    struct timespec timeToWait;
    timeToWait.tv_sec = 5;
    timeToWait.tv_nsec = timeInMs*1000;

    int rt;

    pthread_mutex_lock(&fakeMutex);
    rt = pthread_cond_timedwait(&fakeCond, &fakeMutex, &timeToWait);
    pthread_mutex_unlock(&fakeMutex);
}

I'm using this code to try to get a thread to wait around for a bit, but it doesn't work at all. No errors, it just doesn't make the program execute any slower.

I was thinking maybe each thread needs to have it's own condition and mutex, but that really doesn't make sense to me.

Answer 1

The pthread_cond_timedwait function takes an absolute time, not a relative time. It takes the time you want to stop waiting, not how long you want to wait.