emscripten-core/emscripten

Develop a fully multithreaded C runtime for pthreads.

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#3,495 opened on Jun 3, 2015

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help wantedmultithreading

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Description

Several functions in the C runtime are currently effectively singlethreaded, because they carry global process specific state in JS code that can't be thread local. Therefore calls to these runtime functions from pthreads are proxied to the main thread. Migrating to use more musl can avoid this issue. Also, investigate creating a fully asm.js -based virtual filesystem to be used when targeting pthreads, so that C file I/O can be naturally multithreaded as well.

Contributor guide

Research direction
Investigate the current singlethreaded runtime functions and identify which are proxied to the main thread. Look into migrating to musl for thread local state. Explore creating an asm.js based virtual filesystem for multithreaded file I/O.
Tech stack
cjavascript
Domain
compilersbackend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Over 1 week
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
Cpthreads
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20