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n-api: add API for asynchronous functions (simpler version)

Rodrigo Muino Tomonari requested to merge github/fork/gabrielschulhof/napi-threadsafe-function-call-js into master

Bundle a uv_async_t and a napi_ref to make it possible to call into JS from another thread. The API accepts a void data pointer and a callback which will be invoked on the loop thread and which will receive the napi_value resulting from the napi_ref so as to perform the call into JS. The callback is run inside a node::CallbackScope.

Fixes: https://github.com/nodejs/node/issues/13512

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • documentation is changed or added
  • commit message follows commit guidelines
Affected core subsystem(s)

n-api

This is an alternative, and perhaps simpler implementation of napi_threadsafe_function, alternative to https://github.com/nodejs/node/pull/17809/

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