build(deps-dev): bump async from 2.15.3 to 2.16.0

[dependabot[bot]]

Bumps async from 2.15.3 to 2.16.0.

Changelog

Sourced from async's changelog.

v2.16.0

Better Handling of Async and Sync in Nested Fibers

Interleaving bare fibers within Async and Sync blocks should not cause problems, but it presents a number of issues in the current implementation. Tracking the parent-child relationship between tasks, when they are interleaved with bare fibers, is difficult. The current implementation assumes that if there is no parent task, then it should create a new reactor. This is not always the case, as the parent task might not be visible due to nested Fibers. As a result, Async will create a new reactor, trying to stop the existing one, causing major internal consistency issues.

I encountered this issue when trying to use Async within a streaming response in Rails. The protocol-rack uses a normal fiber to wrap streaming responses, and if you try to use Async within it, it will create a new reactor, causing the server to lock up.

Ideally, Async and Sync helpers should work when any Fiber.scheduler is defined. Right now, it's unrealistic to expect Async::Task to work in any scheduler, but at the very least, the following should work:

reactor = Async::Reactor.new # internally calls Fiber.set_scheduler
This should run in the above reactor, rather than creating a new one.
Async do

puts "Hello World"

end

In order to do this, bare Async and Sync blocks should use Fiber.scheduler as a parent if possible.

See socketry/async#340 for more details.

Commits

• fc3fe3b Bump minor version.
• d410bc0 Update readme.md.
• 9d77c1f Update titles.
• b5494cc Better handling of bare Async and Sync blocks when a scheduler is defined...
• fc6b5d7 Add releases.md.
• 5caa9f9 Move "See Also" section.
• 042d12b Make value the alias.
• 3c4eb3a Test stop during fiber resume.
• See full diff in compare view

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