This project forked from toetoe55/async-rt-book
Rust simple async runtime constructions book.
目前Rust使用最广的异步运行时是tokio，但tokio是一个十分完整的运行时，对于使用者来说几乎是一个黑盒，除非直接深入其源码，否则无法了解其结构与设计。这又使得tokio又像是一个无缝的蛋，当我们希望定制一些调度规则时，几乎是无从下手。
而smol作为tokio的“竞争对手”，其接口设计则好多了，将异步运行时拆分成相对独立的且小巧的几块（async-io, async-executor, async-task等等），能学习者能更好地了解异步运行时的结构，也能让使用者方便定制一些特定的规则。
那么这篇文章，大概顺着smol给出的设计思路，从头实现一个简单但齐全的异步运行时，让大家对异步运行时有一个基础的理解。
本文代码参考这里
（一直想写这篇文章，但耽搁了好久）
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