作者:从零开始的程序员生活
来源:https://www.cnblogs.com/lgjbky/p/14759463.html
前言
以前没怎么接触前端,对 JavaScript 的异步操作不了解,现在有了点了解。一查发现 Python 和 JavaScript 的协程发展史简直就是一毛一样!
这里大致做下横向对比和总结,便于对这两个语言有兴趣的新人理解和吸收。
共同诉求
-
随着 cpu 多核化,都需要实现由于自身历史原因(单线程环境)下的并发功能 -
简化代码,避免回调地狱,关键字支持 -
有效利用操作系统资源和硬件:协程相比线程,占用资源更少,上下文更快
什么是协程?
总结一句话,协程就是满足下面条件的函数:
-
可以暂停执行(暂停的表达式称为暂停点) -
可以从挂起点恢复(保留其原始参数和局部变量) -
事件循环是异步编程的底层基石
混乱的历史
Python 协程的进化
-
Python2.2 中,第一次引入了生成器 -
Python2.5 中,yield 关键字被加入到语法中 -
Python3.4 时有了 yield from(yield from 约等于 yield + 异常处理 + send), 并试验性引入的异步 I/O 框架 asyncio(PEP 3156) -
Python3.5 中新增了 async/await 语法(PEP 492) -
Python3.6 中 asyncio 库"转正" (之后的官方文档就清晰了很多)
在主线发展过程中,也出现了很多支线的协程实现如 Gevent。
event loop 将任务划分:
-
主线程循环从"任务队列"中读取事件 -
宏队列(macro task)js 同步执行的代码块,setTimeout、setInterval、XMLHttprequest、setImmediate、I/O、UI rendering等,本质是参与了事件循环的任务 -
微队列(micro task)Promise、process.nextTick(node环境)、Object.observe, MutationObserver等,本质是直接在 Javascript 引擎中的执行的没有参与事件循环的任务
扩展阅读 Node.js 中的 EventLoop (http://www.ruanyifeng.com/blog/2014/10/event-loop.html)
总结与对比
说明 | python | JavaScript | 点评 |
---|---|---|---|
进程 | 单进程 | 单进程 | 一致 |
中断/恢复 | yield,yield from,next,send | yield,next | 基本相同,但 JavaScript 对 send 没啥需求 |
未来对象(回调包装) | Futures | Promise | 解决 callback,思路相同 |
生成器 | generator | Generator | 将 yield 封装为协程Coroutine,思路一样 |
成熟后关键词 | async、await | async、await | 关键词支持,一毛一样 |
事件循环 | asyncio 应用的核心。事件循环会运行异步任务和回调,执行网络 IO 操作,以及运行子进程。asyncio 库支持的 API 较多,可控性高 | 基于浏览器环境基本是黑盒,外部基本无法控制,对任务有做优先级分类,调度方式有区别 | 这里有很大区别,运行环境不同,对任务的调度先后不同,Python 可能和 Node.js 关于事件循环的可比性更高些,这里还需需要继续学习 |
到这里就基本结束了,看完不知道你会有什么感想,如有错误还请不吝赐教。
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51, 51)" data-darkmode-original-color-15860613985508="rgb(51, 51, 51)" data-darkmode-bgimage-15860613985508="1" data-darkmode-bgcolor-15870356070738="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356070738="rgb(255, 255, 255)" data-darkmode-color-15870356070738="rgb(51, 51, 51)" data-darkmode-original-color-15870356070738="rgb(51, 51, 51)" data-darkmode-bgimage-15870356070738="1" data-darkmode-bgcolor-15870356071023="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356071023="rgb(255, 255, 255)" data-darkmode-color-15870356071023="rgb(51, 51, 51)" data-darkmode-original-color-15870356071023="rgb(51, 51, 51)" data-darkmode-bgimage-15870356071023="1" data-darkmode-bgcolor-15882384789136="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882384789136="rgb(255, 255, 255)" data-darkmode-color-15882384789136="rgb(51, 51, 51)" data-darkmode-original-color-15882384789136="rgb(51, 51, 51)" data-darkmode-bgimage-15882384789136="1" data-darkmode-bgcolor-15882396318564="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882396318564="rgb(255, 255, 255)" data-darkmode-color-15882396318564="rgb(51, 51, 51)" data-darkmode-original-color-15882396318564="rgb(51, 51, 51)" data-darkmode-bgimage-15882396318564="1" data-darkmode-bgcolor-15900529136199="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15900529136199="rgb(255, 255, 255)" data-darkmode-color-15900529136199="rgb(51, 51, 51)" data-darkmode-original-color-15900529136199="rgb(51, 51, 51)" data-darkmode-bgimage-15900529136199="1" style="outline: 0px;max-width: 100%;font-size: 14px;color: rgb(51, 51, 51);text-align: left;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="outline: 0px;max-width: 100%;font-family: 楷体, 楷体_GB2312, SimKai;white-space: pre-wrap;font-size: 12px;box-sizing: border-box !important;overflow-wrap: break-word !important;">点阅读原文,领AI全套资料</span></section></section></section></section></section></section></section>
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