pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
pthread_mutex_lock(&mutex); //加锁
pthread_mutex_unlock(&mutex); //释放锁
pthread_cond_wait(&cond, &mutex); //条件等待 进入此语句将加锁进行释放
pthread_cond_signal(&cond); //激活条件
pthread_cond_broadcast(&cond); // 广播 激活所有满足此条件的
pthread_create(&tid[i-1], NULL, thread_fun, &i); //创建线程
pthread_join(tid[i], NULL); //等待线程结束
