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

int N=0;
void *thread(void *arg)
{
   int n,i;
   for (i=0;i<5;i++)
   {
    n=N;
    n++;
    printf("thread() [%lu]\n",(unsigned long)pthread_self());
    fflush(stdout);
    sleep(1);
    N=n;
   }
pthread_exit(NULL);
}

int main(void)
{
   pthread_t tid;
   int i;
   if(pthread_create(&tid,NULL,thread,NULL))
   {
      perror("...pthread_create()..."); exit(1);
   }
   for (i=0;i<5;i++)
   {
      N--;
      printf("main()   [%lu]\n", (unsigned long)pthread_self() );
      fflush(stdout);
      sleep(1);
   }
   if(pthread_join(tid,NULL))
   {perror("...pthread_join()...");exit(2);}
   printf("\nglobalnie N=%d, po wykonaniu 5+5 iteracji\n",N);
   return 0;
}