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n-api: render finalizers as env cleanup hooks #28428

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n-api: render finalizers as env cleanup hooks #28428

wants to merge 1 commit into from

Commits on Oct 13, 2019

  1. src: render N-API weak callbacks as cleanup hooks 

    Since worker threads are complete Node.js environments, including the
ability to load native addons, and since those native addons can
allocate resources to be freed when objects go out of scope, and since,
upon worker thread exit, the engine does not invoke the weak callbacks
responsible for freeing resources which still have references, this
modification introduces tracking for weak references such that a list
of outstanding weak references is maintained. This list is traversed
during environment teardown. The callbacks for the remaining weak
references are called.

This change is also relevant for Node.js embedder scenarios, because in
those cases the process also outlives the `node::Environment` and
therefore weak callbacks should also be rendered as environment cleanup
hooks to ensure proper cleanup after native addons. This changes
introduces the means by which this can be accomplished.

A benchmark is included which measures the time it takes to execute the
weak reference callback for a given number of weak references.

Re: tc39/proposal-weakrefs#125 (comment)
    Gabriel Schulhof committed Oct 13, 2019
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