使用libuv实现生产者和消费者模式

生产者和消费者模式(Consumer + Producer model)

用于把耗时操作(生产线程),分配给一个或者多个额外线程执行(消费线程),从而提高生产线程的响应速度(并发能力)

定义

typedef std::unique_ptr<Work> WorkPtr;
std::queue<WorkPtr> work_queue;
uv_mutex_t mutex;
uv_cond_t cond;

生产

//adding new work
WorkPtr newWork(new Work);
uv_mutex_lock(&mutex);
work_queue.push(std::move(new_work));
uv_cond_signal(&cond);
uv_mutex_unlock(&mutex);

消费

while(true)
{
  //copying work that has to be done
  uv_mutex_lock(&mutex);
  while(work_queue.empty())
  {
    uv_cond_wait(&cv, &mutex);
  }
  WorkPtr work;
  work.swap(work_queue.front());
  work_queue.pop();
  uv_mutex_unlock(&mutex);
  //doing work ...
}