#include <stdlib.h>     /* for EXIT_SUCCESS  */
#include <stdio.h>      /* for fprintf       */
#include <unistd.h>     /* for sleep         */

#include "semaphore.h"
#define THREADS  10

static semaphore_p sem;

void* threadMain(void* arg){
  int me = (int)arg;
  fprintf(stderr, "Thread %d waiting.\n", me);
  waitSemaphore(sem);
  fprintf(stderr, "Thread %d woken up from wait.\n", me);
  pthread_exit(NULL);
}
int main(int argc, char** argv){
  pthread_t threads[THREADS];
  int i;
  /* let's start of with the semaphore locked.                   */
  sem = newSemaphore(0);
  for(i = 0; i < THREADS; i++)
    pthread_create(&threads[i], NULL, threadMain, (void *)i);
  fprintf(stderr, "Main thread finished creating threads\n");
  for(i = 0; i < THREADS; i++){
    fprintf(stderr, "Main thread posting on iteration %d\n", i);
    postSemaphore(sem);
    sleep(1);
  }
  freeSemaphore(sem);
  exit(EXIT_SUCCESS);
}