/*
 * Exemplo 2: FUTEX_WAKE. Thread 0 acorda N-1 threads.
 */
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include <pthread.h>
#include "myfutex.h"

#define N 10

int futex_addr = 0;

void* f_thread(void *v) {
  futex_wait(&futex_addr, 0);
  printf("Thread %d.\n", (int) v);
  return NULL;
}

void* f_thread0(void *v) {
  sleep(5);
  futex_wake(&futex_addr, N-1);  
  printf("Thread 0.\n");
  return NULL;
}

int main() {
  pthread_t thr[N]; 
  int i;
  
  for (i=1; i < N; i++)
    pthread_create(&thr[i], NULL, f_thread, (void*) i);
  pthread_create(&thr[0], NULL, f_thread0, NULL);
  
  pthread_exit(0);
}