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

int count;

void *inc(void *arg)
{
	while (1) {
		count++;
		printf("count = %d\n", count);
		sleep(1);
	}
}

void *dec(void *arg)
{
	while (1) {
		count--;
		printf("count = %d\n", count);
		sleep(1);
	}
}

int main(int argc)
{
	count = 0;
	pthread_t id1, id2; 

	pthread_create(&id1, NULL, inc, NULL);
	pthread_create(&id2, NULL, dec, NULL); 

	while (1) {
		sleep(1);
	}

	return 0;
}