What's wrong with this simple thread example?

From: jsmithe8 (jsmithe8_at_NOSPAM.netscape.net)
Date: 09/21/04 

Date: Tue, 21 Sep 2004 12:15:52 +1000

Does anyone know what's wrong with this code, I'm trying to get threads to
work on redhat linux. It won't compile.

Thanks in advance.
#include <unistd.h>

#include <pthread.h>

#include <stdio.h>

#include <sys/types.h>

#define _REENTRANT

pthread_t thr_a, main_thr;

void* a(void* arg){

printf("Thread a");

pthread_exit ((void *)main_thr);

}

void main(){

int junk;

main_thr = pthread_self();

if (pthread_create(&thr_a,NULL, a, NULL))

printf("Can't create thr_a\n");

}

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