spacejam/sled

implement actual parallel IO trait for windows

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#243 创建于 2018年2月11日

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 (3 评论) (0 反应) (0 负责人)Rust (6,419 star) (315 fork)batch import
help wantednewbie

描述

We need to support parallel writes for building on windows.

I believe the way to go about this is through https://retep998.github.io/doc/kernel32/fn.WriteFile.html and passing in an OVERLAPPED struct, as per SO.

Here's the current, global-lock driven approach on windows, which may not even compile: https://github.com/spacejam/sled/pull/242/commits/2906673fe6755f18bebf5d90a63eca6ff75a2036#diff-f23996d5649981fd238dd760793391c1R78

贡献者指南

技术栈
rust
领域
backendperformance
议题类型
feature
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
4
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
3-5 days
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
stale
清晰度议题是否清楚说明期望改动、验收标准和下一步。
mostly clear
前置要求
Familiarity with Rust async/IOWindows API knowledgeUnderstanding of sled's internal IO trait
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
25
研究方向
The issue requires implementing parallel writes on Windows using the WriteFile function with an OVERLAPPED structure. Start by examining the linked commit (https://github.com/spacejam/sled/pull/242/commits/2906673fe6755f18bebf5d90a63eca6ff75a2036) to understand the current global lock approach and the changes attempted before. Then research Windows overlapped IO documentation and how to integrate it safely with Rust's ownership model. The goal is to replace the global mutex with per file async operations that allow concurrent writes, similar to the Linux implementation using preadv/pwritev.