gistfile1.h

#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>

#include <dispatch/dispatch.h>

int main(void) {
	dispatch_queue_t the_queue = dispatch_get_concurrent_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT);
	size_t iterations = 100;

	dispatch_apply(iterations, the_queue, ^(size_t idx) {
		sleep(rand()%10);
		printf("%zu\n", idx);
	});
	exit(0);
}