#include "apue.h"
#include <pthread.h>

struct foo {
	int a, b, c, d;
};

void
printfoo(const char *s, const struct foo *fp)
{
	printf(s);
	printf("  structure at 0x%x\n", (unsigned)fp);
	printf("  foo.a = %d\n", fp->a);
	printf("  foo.b = %d\n", fp->b);
	printf("  foo.c = %d\n", fp->c);
	printf("  foo.d = %d\n", fp->d);
}

void *
thr_fn1(void *arg)
{
	struct foo *fp;

	if ((fp = malloc(sizeof(struct foo))) == NULL)
		err_sys("can't allocate memory");
	fp->a = 1;
	fp->b = 2;
	fp->c = 3;
	fp->d = 4;
	printfoo("thread:\n", fp);
	return((void *)fp);
}

int
main(void)
{
	int err;
	pthread_t tid1;
	struct foo *fp;

	err = pthread_create(&tid1, NULL, thr_fn1, NULL);
	if (err != 0)
		err_exit(err, "can't create thread 1");
	err = pthread_join(tid1, (void *)&fp);
	if (err != 0)
		err_exit(err, "can't join with thread 1");
	printfoo("parent:\n", fp);
	exit(0);
}