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 ...
 }