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

int Global;

void *Thread1(void *x)
{
	Global++;
	return NULL;
}

void *Thread2(void *x)
{
	Global--;
	return NULL;
}

int main()
{
	pthread_t t[2];
	pthread_create(&t[0], NULL, Thread1, NULL);
	pthread_create(&t[1], NULL, Thread2, NULL);
	pthread_join(t[0], NULL);
	pthread_join(t[1], NULL);
}