#include "apue.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);}intmain(void){	int			err;	pthread_t	tid1, tid2;	void		*tret;	err = pthread_create(&tid1, NULL, thr_fn1, NULL);	if (err != 0)		err_quit("can't create thread 1: %s\n", strerror(err));	err = pthread_create(&tid2, NULL, thr_fn2, NULL);	if (err != 0)		err_quit("can't create thread 2: %s\n", strerror(err));	err = pthread_join(tid1, &tret);	if (err != 0)		err_quit("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)		err_quit("can't join with thread 2: %s\n", strerror(err));	printf("thread 2 exit code %d\n", (int)tret);	exit(0);}