How to sleep or pause a PThread in c on Linux

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You can use a mutex, condition variable, and a shared flag variable to do this. Let’s assume these are defined globally:

pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
int play = 0;

You could structure your playback code like this:

for(;;) { /* Playback loop */
    pthread_mutex_lock(&lock);
    while(!play) { /* We're paused */
        pthread_cond_wait(&cond, &lock); /* Wait for play signal */
    }
    pthread_mutex_unlock(&lock);
    /* Continue playback */
}

Then, to play you can do this:

pthread_mutex_lock(&lock);
play = 1;
pthread_cond_signal(&cond);
pthread_mutex_unlock(&lock);

And to pause:

pthread_mutex_lock(&lock);
play = 0;
pthread_mutex_unlock(&lock);

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