如何异步伺机不阻止？ [英] How does async-await not block?

问题描述

我收集的异步方法是良好的IO工作，因为它们不会阻塞线程，同时他们正等待着，这是怎么回事实际上可能吗？我认为有些事情是听来触发完成任务，那么，这是否意味着阻塞刚搬到别的地方？

I gather that the async methods are good for IO work because they don't block the thread whilst they're being awaited, but how is this actually possible? I assume something has to be listening to trigger the task to complete, so does this mean that the blocking is just moved somewhere else?

推荐答案

没有，阻塞不动其他任何地方。返回awaitable类型BCL方法使用技术，如用一个完全异步的经验I / O完成端口重叠I / O。

No, the blocking is not moved anywhere else. BCL methods that return awaitable types use techniques such as overlapped I/O with I/O completion ports for a fully asynchronous experience.

我有一个最近的博客帖子描述这是如何工作的所有方式，以物理设备和背部。

I have a recent blog post that describes how this works all the way down to the physical device and back.

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