pthread互斥锁，使用pthread_mutex_trylock（）进行线程同步

Question

我一直在努力获取键值哈希字典，而我需要做的事情之一就是在负载系数达到阈值时重新哈希，以确保没有其他线程在访问它，我正尝试将其降低到一个队列。

这是否将成功阻止多个线程同时读取/写入资源，或者是否缺少我所需要的东西。

谢谢！！

typedef struct {
  pthread_mutex_t mutex;
  pthread_cond_t cond;
  pthread_rwlock_t rw_lock;
} thread_conch;

typedef struct {
  thread_conch d_lock;
  size_t elements;
  size_t hash_size;
  struct kv_record **bucket;
} dictionary;

void init_conch(thread_conch *t_lock)
{
  pthread_mutex_init(&t_lock->mutex, NULL);
  pthread_cond_init(&t_lock->cond, NULL);
  pthread_rwlock_init(&t_lock->rw_lock, NULL);
}

void destroy_conch(thread_conch *t_lock)
{
  pthread_mutex_destroy(&t_lock->mutex);
  pthread_cond_destroy(&t_lock->cond);
  pthread_rwlock_destroy(&t_lock->rw_lock);
}

void hold_conch(thread_conch *t_lock)
{
  pthread_rwlock_wrlock(&t_lock->rw_lock);
  while (pthread_mutex_trylock(&t_lock->mutex) != 0)
    ;
}

void read_conch(thread_conch *t_lock)
{
  while (pthread_rwlock_tryrdlock(&t_lock->rw_lock) != 0)
    pthread_cond_wait(&t_lock->cond, &t_lock->mutex);

}
void release_conch(thread_conch *t_lock)
{
  pthread_rwlock_unlock(&t_lock->rw_lock);
  pthread_mutex_unlock(&t_lock->mutex);
  pthread_cond_broadcast(&t_lock->cond);
}