/*
 * Thread 0 executa cond_wait
 * Thread 1 executa cond_signal
 * Thread 2 executa cond_wait e não fica bloqueada
 * Thread 0 continua esperando... 
 */

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


#include "mutex_lista.h"

cond_t cond;
mutex_t mutex;

void *thread_0(void* v) {
 
  mutex_lock(&mutex);
  
  printf("Thread 0 vai executar cond_wait.\n");
  cond_wait(&cond, &mutex);
  printf("Thread 0 vai continuar sua execução.\n");
  
  mutex_unlock(&mutex);
  
  return NULL;
}

void *thread_1(void* v) {
 
  mutex_lock(&mutex);
  
  printf("Thread 1 vai executar cond_signal.\n");
  cond_signal(&cond);
  
  mutex_unlock(&mutex);
  
  return NULL;
}

void *thread_2(void* v) {
 
  mutex_lock(&mutex);
  
  printf("Thread 2 vai executar cond_wait.\n");
  cond_wait(&cond, &mutex);
  printf("Thread 2 vai continuar sua execução.\n");

  mutex_unlock(&mutex);
  
  return NULL;
}


int main() {
  pthread_t thr0, thr1, thr2;
  
  mutex_init(&mutex, NULL);
  cond_init(&cond, NULL);

  pthread_create(&thr0, NULL, thread_0, NULL);
  pthread_create(&thr1, NULL, thread_1, NULL);
  pthread_create(&thr2, NULL, thread_2, NULL);

  pthread_join(thr0, NULL);
  pthread_join(thr1, NULL);
  pthread_join(thr2, NULL);

  mutex_destroy(&mutex);
  cond_destroy(&cond);
  
  return 0;
}