write.c

#include <unistd.h>    /* for usleep() */
#include <shm_arena.h> /* for Shared Memory Arena Library */


int main(void)
{
  int *ptr;
  int running = 1;

  ptr = (int *) sm_get(sizeof(int), "count");
  if(!ptr)
    {
      printf("sm_get() failed\n");
      return 1;
    }

  sm_wrlock(ptr);

  *ptr = 0;

  sm_unlock(ptr);

  while(running)
    {
      sm_wrlock(ptr);

      if(++*ptr > 10)
        running = 0;

      sm_unlock(ptr);
      
      sleep(1);
    }

  return 0;
}