#include <pthread.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
 
 
int myglobal;
 
void *thread_function ( void *arg ) {
	int i,j;
	
	for ( i = 0; i < 20; i++ ) {
		j = myglobal;
		j = j + 1;
		printf(".");
		fflush(stdout);
		sleep(2);
		myglobal = j;
	}
 
	return NULL;
}
 
int main ( void ) {
 
	pthread_t mythread;
	int i;
 
	if ( pthread_create(&mythread, NULL, thread_function, NULL) ) {
		printf("error creating thread.\n");
		abort();
	}
 
	for ( i = 0; i < 20; i++) {
		myglobal = myglobal + 1;
		printf("o");
		fflush(stdout);
		sleep(1);
	}
 
	if ( pthread_join(mythread, NULL) ) {
		printf("error joining thread");
		abort();
	}
 
	printf("\nmyglobal equals %d", myglobal);
 
	exit(0);
}