pthread1.c

#include <stdio.h>
#include <string.h>
#include <pthread.h>

void *thr_fn1(void *arg)
{
	printf("thread 1 returning\n");
	return ((void *)1);
}

void *thr_fn2(void *arg)
{
	printf("thread 2 exiting\n");
	pthread_exit((void*)2);
}

int main(void)
{
	int err;
	pthread_t tid1,tid2;
	void *tret;

	err = pthread_create(&tid1, NULL, thr_fn1, NULL);
	if(err != 0)
		printf("can't create thread 1: %s\n", strerror(err));
	err = pthread_create(&tid2, NULL, thr_fn2, NULL);
	if(err != 0)
		printf("can't create pthread 2: %s\n", strerror(err));

	err = pthread_join(tid1, &tret);
	if(err != 0)
		printf("can't join with thread 1: %s\n", strerror(err));
	printf("thread 1 exit code %d\n", (int)tret);
	err = pthread_join(tid2, &tret);
	if(err != 0)
		printf("can't join with thread 2: %s\n", strerror(err));
	printf("thread 2 exit code %d\n", (int)tret);
	return 0;
}