A coroutine is a function that can suspend execution to be resumed later. Coroutines are stackless: they suspend execution by returning to the caller. This allows for sequential code that executes asynchronously (e.g. to handle non-blocking I/O without explicit callbacks), and also supports algorithms on lazy-computed infinite sequences and other uses.
asyncio is a library to write concurrent code using the async/await syntax.
asyncio is used as a foundation for multiple Python asynchronous frameworks that provide high-performance network and web-servers, database connection libraries, distributed task queues, etc.
asyncio is often a perfect fit for IO-bound and high-level structured network code.
Note: Python introduced the concept of coroutines in 3.4, and 3.5 defined the syntax for coroutines.
- Version: 3.5
- Documentation 1
- Documentation 2
Coroutine will be added to C++20 as a standard in 2020.
libco is a coroutine library which is widely used in wechat back-end service. It has been running on tens of thousands of machines since 2013.
- Version: Clone from github on 2019.4.1
- Github
- C/C++协程库libco：微信怎样漂亮地完成异步化改造
- Closure源代码分析