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POThread timer in c
 

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    <p>can someone help me to transform my code to a working code :</p> <pre><code>#include &lt;pthread.h&gt; #include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #include &lt;unistd.h&gt; pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; /* call back function - inform the user the time has expired */ void timeout_call_back() { printf("=== your time is up ===\n"); // doing some other stuff } /* Go to sleep for a period of seconds */ static void* start_timer(void *args) { /* function pointer */ void (*finish_function)(); int seconds = *((int*) args); pthread_mutex_lock(&amp;mutex); // I want to do this action atomically printf("thread ID : %ld, go to sleep for %d\n", pthread_self(), seconds); finish_function = timeout_call_back; // ATOMIC PART // This function is called in real time, so I need it // to be safe, and it's executed just when the timer is not reached. atomic_function_callback(); // THIS IS MY PROBLEM. I WANT TO WAIT for (seconds) seconds, // but I don't want to block other threads. sleep(seconds); /* call the cb to inform the user time is out */ (*finish_function)(); pthread_mutex_unlock(&amp;mutex); pthread_exit(NULL); } int main() { pthread_t thread1, thread2, thread3; int seconds1 = 300; int seconds2 = 600; int seconds3 = 900; int rc1, rc2, rc3; rc1 = pthread_create(&amp;thread1, NULL, start_timer, (void *) &amp;seconds1); if(rc1) printf("=== Failed to create thread1\n"); rc2 = pthread_create(&amp;thread2, NULL, start_timer, (void *) &amp;seconds2); if(rc2) printf("=== Failed to create thread2\n"); rc3 = pthread_create(&amp;thread3, NULL, start_timer, (void *) &amp;seconds3); if(rc3) printf("=== Failed to create thread3\n"); pthread_join(thread1, NULL); pthread_join(thread2, NULL); pthread_join(thread3, NULL); printf("=== End of all threads in ===\n"); return 0; } </code></pre> <p>When i run this code just one thread can run in a time (cause of mutex) but i need this mutex. is there any alternative to sleep() that allow me to do a non blocking timer?</p> <p>This is just a sample, my real timers are very long (8 hours).</p> <p>Thanks.</p>
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    1. COAs your code is now, there is no reason to hold the mutex for the duration of sleep - is there a good reason for grabbing that mutex that long, i.e. can you simply not release it before the sleep call and reaquire it after ?
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    2. CODo you need the mutex to be held through both `atomic_function_callback` and `timeout_call_back`? Is it okay to release the mutex between those calls?
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