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

int count;

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

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

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;
}