/*
 * Deadlock: thread i espera thread (i+1)%N terminar.
 */ 
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#define N 5

pthread_t thr[N];

void* f_thread(void *v) {
  int thr_id;

  thr_id = *(int *) v;
  printf("Thread %d.\n", thr_id);
  sleep(2); /* Aguarda todas as threads serem criadas. */
  pthread_join(thr[(thr_id+1)%N], NULL);
  printf("Não houve deadlock.\n");
  return NULL;
}

int main() {
  int i, id[N];

  for (i = 0; i < N; i++) {
    id[i] = i;
    pthread_create(&thr[i], NULL, f_thread, (void*) &id[i]);
  }

  sleep(100); 

  return 0;
}