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https://issues.apache.org/jira/browse/ARROW-13267?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17375968#comment-17375968
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Antoine Pitrou commented on ARROW-13267:
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I'm not sure adding implicit queueing is a good idea. Allowing to reliably
distinguish reentrant and non-reentrant generators sounds useful however.
> [C++] Distinguish between async-reentrant generators and unsafe generators
> --------------------------------------------------------------------------
>
> Key: ARROW-13267
> URL: https://issues.apache.org/jira/browse/ARROW-13267
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Weston Pace
> Priority: Major
>
> Right now there are a lot of comments in the MakeXyzGenerator functions
> explaining if a generator can be called async reentrantly and if it will call
> input generators async reentrantly. Rather than rely on comments and the
> user doing the right thing we could create types for the two generators. The
> unsafe generator could even serve as a base type that queues incoming
> requests. This way all generators would technically be async reentrant and
> it would hopefully remove some of the confusion.
>
> This does mean converting async generators from aliases of std::function to
> actual types.
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