spacejam/sled

implement actual parallel IO trait for windows

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#243 建立於 2018年2月11日

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 (3 留言) (0 反應) (0 負責人)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

貢獻者指南

技術棧
rust
領域
backendperformance
議題類型
feature
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
4
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
3-5 days
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
stale
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
mostly clear
前置要求
Familiarity with Rust async/IOWindows API knowledgeUnderstanding of sled's internal IO trait
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
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.