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    <p>Do you want your main thread to do anything in particular after all the threads have completed?</p> <p>If not, you can have your main thread simply call <code>pthread_exit()</code> instead of returning (or calling <code>exit()</code>). </p> <p>If <code>main()</code> returns it implicitly calls (or behaves as if it called) <code>exit()</code>, which will terminate the process. However, if <code>main()</code> calls <code>pthread_exit()</code> instead of returning, that implicit call to <code>exit()</code> doesn't occur and the process won't immediately end - it'll end when all threads have terminated.</p> <ul> <li><a href="http://pubs.opengroup.org/onlinepubs/007908799/xsh/pthread_exit.html" rel="noreferrer">http://pubs.opengroup.org/onlinepubs/007908799/xsh/pthread_exit.html</a></li> </ul> <p>Can't get too much quick-n-dirtier.</p> <p>Here's a small example program that will let you see the difference. Pass <code>-DUSE_PTHREAD_EXIT</code> to the compiler to see the process wait for all threads to finish. Compile without that macro defined to see the process stop threads in their tracks. </p> <pre><code>#include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #include &lt;pthread.h&gt; #include &lt;time.h&gt; static void sleep(int ms) { struct timespec waittime; waittime.tv_sec = (ms / 1000); ms = ms % 1000; waittime.tv_nsec = ms * 1000 * 1000; nanosleep( &amp;waittime, NULL); } void* threadfunc( void* c) { int id = (int) c; int i = 0; for (i = 0 ; i &lt; 12; ++i) { printf( "thread %d, iteration %d\n", id, i); sleep(10); } return 0; } int main() { int i = 4; for (; i; --i) { pthread_t* tcb = malloc( sizeof(*tcb)); pthread_create( tcb, NULL, threadfunc, (void*) i); } sleep(40); #ifdef USE_PTHREAD_EXIT pthread_exit(0); #endif return 0; } </code></pre>
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    1. POHow can I wait for any/all pthreads to complete?
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    1. USMichael Burr
    1. USMichael Burr
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    1. COThanks for the reply! Actually - yes - the main thread needs to clean-up/remove a shared memory segment - so I can't just call pthread_exit as you have described. (I now realize I should have stated this in the OP). Thanks for the response!
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