RcppParallel with TBB not releasing threads

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
cpp, r
Domain
distributed-systems, performance

Research direction

Start by running the RcppParallel gallery's distance matrix example with the TBB backend on macOS or Linux and compare it with tinythread. Investigate the TBB thread lifetime and shutdown behavior; done means determining whether unreleased threads are intentional and identifying or documenting an accepted release mechanism.

Written by the indexing model from the issue text.

Description

For example, running the distance matrix example in the RcppParallel gallery with TBB (but not tinythread) as the backend results in unreleased threads after the program finishes. Tested on both macOS and Linux platforms -- I am assuming this is broadly replicable, but if not, am happy to provide specifics.

Is this behavior intentional and if so, is there an accepted way to release the threads?

Dominant language
C++
Stars
173
Forks
60
Avg merge
1h 55m
Merged PRs (30d)
2

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