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

1 typedef std::unique_ptr<Work> WorkPtr;
2 std::queue<WorkPtr> work_queue;
3 uv_mutex_t mutex;
4 uv_cond_t cond;

生产

1 //adding new work
2 WorkPtr newWork(new Work);
3 uv_mutex_lock(&mutex);
4 work_queue.push(std::move(new_work));
5 uv_cond_signal(&cond);
6 uv_mutex_unlock(&mutex);

消费

 1 while(true)
 2 {
 3   //copying work that has to be done
 4   uv_mutex_lock(&mutex);
 5   while(work_queue.empty())
 6   {
 7     uv_cond_wait(&cv, &mutex);
 8   }
 9   WorkPtr work;
10   work.swap(work_queue.front());
11   work_queue.pop();
12   uv_mutex_unlock(&mutex);
13   //doing work ...
14 }