#include <pthread.h>
#include <stdio.h>
#include <err.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>

#define NTHREADS 10
pthread_cond_t c = PTHREAD_COND_INITIALIZER;
pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;
size_t t = -1;

void *thread(void *arg)
{
	size_t i = (size_t)arg;
	struct timespec ts = { 1, 500000 * (i * 1) };
	printf("%zu\n", i);
	nanosleep(&ts, NULL);
	pthread_mutex_lock(&m);
	t = i;
	pthread_cond_signal(&c);
	pthread_mutex_unlock(&m);
}

int main(void)
{
	size_t i;
	int e;
	pthread_t tid[NTHREADS];

	pthread_mutex_lock(&m);

	for(i = 0; i < NTHREADS; i++) {
		printf("Creating thread: %d\n", i);
		if ((e = pthread_create(&tid[i], NULL, thread, (void *)i)) != 0)
			errc(EXIT_FAILURE, e, "pthread_create() error");
	}
	for (;;) {
		pthread_cond_wait(&c, &m);
		pthread_join(tid[t], NULL);
		if ((e = pthread_create(&tid[t], NULL, thread, (void *)t)) != 0)
			errc(EXIT_FAILURE, e, "pthread_create() error");
	}


	return EXIT_SUCCESS;
}