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

int x = 1;



pthread_mutex_t mutex_aang112 = PTHREAD_MUTEX_INITIALIZER;

void* potok1(int i)
{

 pthread_mutex_lock( &mutex_aang112 );
 
 for (; i < 10; i++)
  {
    printf("Potok1: %d\n", x);
  }
  
 pthread_mutex_unlock( &mutex_aang112 ); 

 return NULL;
}


void* potok2(int i)
{
 
 pthread_mutex_lock( &mutex_aang112 );
 
 for (; i < 10; i++)
  {
   x++;
   printf("Potok2: %d\n", x);
  }

pthread_mutex_unlock( &mutex_aang112 );


 return NULL;
}



void* potok3(int i)
{
 
 pthread_mutex_lock( &mutex_aang112 );
 
 for (; i < 10; i++)
  {
   x--;
   printf("Potok3: %d\n", x);
  
  }
  
// pthread_mutex_unlock( &mutex_aang112 ); 




}



int main()
{
 pthread_attr_t attr;
 pthread_t info;

 int xxx=1;

 pthread_attr_init(&attr);
 
 
 
 pthread_create(&info, &attr, (void*)*potok1, (void*)xxx);


 pthread_create(&info, &attr, (void*)*potok2,  (void*)xxx+1);
 
 pthread_create(&info, &attr, (void*)*potok3, (void*)xxx+2);

 sleep(2);

 return 0;
}