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

pthread_mutex_t count_mutex     = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t condition_mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t  condition_cond  = PTHREAD_COND_INITIALIZER;

void *functionCountOdd();
void *functionCountEven();
void *functionCount();
int  count = 0;
#define COUNT_DONE  10

void main(){
   pthread_t thread1, thread2, thread3;

   pthread_create( &thread1, NULL, &functionCountOdd, NULL);
   pthread_create( &thread2, NULL, &functionCountEven, NULL);
   //pthread_create( &thread3, NULL, &functionCount, NULL);
   pthread_join( thread1, NULL);
   pthread_join( thread2, NULL);
   //pthread_join( thread3, NULL);
}

void *functionCount(){
   while(1){
      pthread_mutex_lock( &count_mutex );
      count++;
      printf("CountAll : %d\n",count);
      pthread_mutex_unlock( &count_mutex );

      if(count >= COUNT_DONE) return(NULL);
    }
}

void *functionCountOdd(){
   while(1){
      pthread_mutex_lock( &condition_mutex );
      while( (count%2)==0 )
      {
         pthread_cond_wait( &condition_cond, &condition_mutex );
      }
      pthread_mutex_unlock( &condition_mutex );

      pthread_mutex_lock( &count_mutex );
      count++;
      printf("CountOdd : %d\n",count);
      pthread_mutex_unlock( &count_mutex );

      if(count >= COUNT_DONE) return(NULL);
    }
}

void *functionCountEven(){
    while(1)
    {
       pthread_mutex_lock( &condition_mutex );
      while( (count%2)==1 )
       {
          pthread_cond_signal( &condition_cond );
       }
       pthread_mutex_unlock( &condition_mutex );

       pthread_mutex_lock( &count_mutex );
       count++;
       printf("CountEven: %d\n",count);
       pthread_mutex_unlock( &count_mutex );

       if(count >= COUNT_DONE) return(NULL);
    }

}