emscripten-core/emscripten

Asyncify: support recursive yield

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#10,375 opened on Feb 6, 2020

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good first bughelp wantedwontfix

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Description

E.g. calling emscripten_sleep() while currently suspended from another emscripten_sleep().

Today this results in an "TypeError: Asyncify.dataInfo[Asyncify.currData] is undefined" error on the second wakeup.

Contributor guide

Research direction
Examine the Asyncify data structure handling to understand why recursive yield causes TypeError on second wakeup. Focus on Asyncify.dataInfo and Asyncify.currData.
Tech stack
javascript
Domain
backend
Issue type
Bug
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.
1-3 hours
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
C++JavaScriptWebAssembly
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40