#include <pthread.h>

int contor=0;
pthread_mutex_t mc=PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t cc=PTHREAD_COND_INITIALIZER;
int thid[3];
pthread_t th[3];

void inccontor(int *id)
{
 int i;
 for (i=0;i<7;i++)
   {
    sleep(2);
    pthread_mutex_lock(&mc);
    contor++;
    printf("Contor... %d\n",contor);
    if (contor==12)
      pthread_cond_signal(&cc);
    pthread_mutex_unlock(&mc);
   }
 pthread_exit(NULL);
}
void watchcontor(int *id)
{
 pthread_mutex_lock(&mc);
 while (contor<=12)
  {
   pthread_cond_wait(&cc,&mc);
   printf("Cond...\n");
   break;
  }
 pthread_mutex_unlock(&mc);
}
main()
{
 int i;
 thid[0]=0;
 thid[1]=1;
 thid[2]=2;
 pthread_create(&th[0],NULL,(void*)watchcontor,&thid[0]);
 pthread_create(&th[1],NULL,(void*)inccontor,&thid[1]);
 pthread_create(&th[2],NULL,(void*)inccontor,&thid[2]);
 for (i=0;i<3;i++)
   pthread_join(th[i],NULL);
}