gistfile1.c

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

const int N = 100;
static pthread_mutex_t _m = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t _c = PTHREAD_COND_INITIALIZER;
static pthread_cond_t _d = PTHREAD_COND_INITIALIZER;
static int _n = N;

void *worker(void *_i)
{
  int i = (int)_i;
  printf("(%d)\n", i);

  pthread_mutex_lock(&_m);
  _n--;
  pthread_cond_signal(&_c);
  pthread_cond_wait(&_d, &_m);
  pthread_mutex_unlock(&_m);

  printf("[%d]\n", i);
}

int main()
{
  pthread_t thrs[N];
  int i = 0;

  for(i = 0; i < N; i++)
    pthread_create(thrs + i, NULL, worker, (void *)i);

  pthread_mutex_lock(&_m);
  while(_n > 0)
    pthread_cond_wait(&_c, &_m);
  pthread_cond_broadcast(&_d);
  pthread_mutex_unlock(&_m);

  for(i = 0; i < N; i++)
    pthread_join(thrs[i], NULL);
}