#include <sys/time.h>
#include <sys/resource.h>
#include <unistd.h>
#include <pthread.h>

void* do_the_work (void *data) {
	int *v = data;
	int i;
	for (i = 0; i < 300000000; ++i) {
		*v = *v + 1;
	}
	printf ("done\n");
	return NULL;
}

int 
main (int argc, char *argv[]) {
	int v = 0;
	pthread_t thread;
	if (argc > 1) {
		printf ("using a subthread\n");
		pthread_create (&thread, NULL, do_the_work, &v);
		/* the loop above takes more than 1 second on my box, 
		 * so this exits before the subthread has finished its work.
		 */
		if (strcmp (argv [1], "sleep") == 0)
			sleep (1);
		else if (strcmp (argv [1], "join") == 0)
			pthread_join (thread, NULL);
	} else {
		printf ("doing the work in main()\n");
		do_the_work (&v);
	}
	return 0;
}