#include "share.h"

int main() {
  void *shm = NULL;
  struct shm_data *shared = NULL;
  int shmid = get_shmid();
  int semid = get_semaphoreid();
  int i;
  
  shm = shmat(shmid, (void*)0, 0);
  if(shm == (void*)-1){
    exit(0);
  }
  shared = (struct shm_data*)shm;
  while(1){
    semaphore_p(semid);
    if(shared->datalength > 0){
      int sum = 0;
      for(i=0;i<shared->datalength-1;i++){
        printf("%d+",shared->data[i]);
        sum += shared->data[i];
      }
      printf("%d",shared->data[shared->datalength-1]);
      sum += shared->data[shared->datalength-1];
      printf("=%d\n",sum);
      memset(shared, 0, sizeof(struct shm_data));
      semaphore_v(semid);
    } else {
      semaphore_v(semid);
      printf("no tasks, waiting.\n");
      sleep(1);
    }
  }
}