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

sem_t sem;
int count=0;


void ProvideService(){

    while(1) {
       // Wait semaphore
       sem_wait(&sem);
       if (count<0x7fffffff) 
          count++;
       else 
          count--;
       // printf("count is %d\n",count);
    }
}

void SendRequest() {

    while(1) {
       sem_post(&sem);
       sleep(10);
    }
}

int main()
{

   pthread_t t1,t2;

   sem_init(&sem,0,0);
   pthread_create(&t1, NULL, (void *)SendRequest, NULL);
   pthread_create(&t2, NULL, (void *)ProvideService, NULL);

   pthread_join(t2,NULL);

   return 1;
}