rust-lang/futures-rs

Deadlock detection for futures::lock::Mutex

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#2,133 opened on Apr 22, 2020

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A-lockC-feature-requesthelp wanted

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Description

It would be really nice if Mutex had deadlock detection (including via a feature flag). Especially in an async context where it's hard to peer into the state of tasks, these can be exceptionally hard to debug.

parking_lot does this for its synchronous locks, though it requires you to trigger detection manually on another thread.

cc @ctiller

Contributor guide

Research direction
Study how parking lot implements deadlock detection for synchronous locks, then adapt the approach for async futures::lock::Mutex, likely behind a feature flag.
Tech stack
rust
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Rust
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40