Bump io-event from 1.8.4 to 1.9.0

[dependabot]

Bumps io-event from 1.8.4 to 1.9.0.

Changelog

Sourced from io-event's changelog.

v1.9.0

Improved IO::Event::Profiler for detecting stalls.

A new IO::Event::Profiler class has been added to help detect stalls in the event loop. The previous approach was insufficient to detect all possible stalls. This new approach uses the RUBY_EVENT_FIBER_SWITCH event to track context switching by the scheduler, and can detect stalls no matter how they occur.

profiler = IO::Event::Profiler.new
profiler.start
Fiber.new do
sleep 1.0
end.transfer
profiler.stop

A default profiler is exposed using IO::Event::Profiler.default which is controlled by the following environment variables:

• IO_EVENT_PROFILER=true - Enable the profiler, otherwise IO::Event::Profiler.default will return nil.
• IO_EVENT_PROFILER_LOG_THRESHOLD - Specify the threshold in seconds for logging a stall. Defaults to 0.01.
• IO_EVENT_PROFILER_TRACK_CALLS - Track the method call for each event, in order to log specifically which method is causing the stall. Defaults to true.

The previous environment variables IO_EVENT_SELECTOR_STALL_LOG_THRESHOLD and IO_EVENT_SELECTOR_STALL_LOG no longer have any effect.

v1.8.0

Detecting fibers that are stalling the event loop.

A new (experimental) feature for detecting fiber stalls has been added. This feature is disabled by default and can be enabled by setting the IO_EVENT_SELECTOR_STALL_LOG_THRESHOLD to true or a floating point number representing the threshold in seconds.

When enabled, the event loop will measure and profile user code when resuming a fiber. If the fiber takes too long to return back to the event loop, the event loop will log a warning message with a profile of the fiber's execution.

> cat test.rb 
#!/usr/bin/env ruby
require_relative "lib/async"
Async do

Fiber.blocking do

sleep 1

end

end
> IO_EVENT_SELECTOR_STALL_LOG_THRESHOLD=true bundle exec ./test.rb

Fiber stalled for 1.003 seconds

/home/samuel/Developer/socketry/async/test.rb:6 in '#<Class:Fiber>#blocking' (1s)

/home/samuel/Developer/socketry/async/test.rb:7 in 'Kernel#sleep' (1s)

... (truncated)

Commits

• 6dd1f97 Bump minor version.
• 3d52925 Fix test.
• 358300a Modernize code, add Ruby 3.4 to CI.
• e97accf Add default implementation of IO::Event::Profiler.default.
• 83be882 Tidy up implementation of profiler + release notes.
• c00e50b Add shim for profiler.
• 40fca94 Fix: warning: old-style function definition.
• a9dc943 RuboCop.
• ee8669a Make sure profiler->current is initialized correctly.
• 396ca5f Add config/environment.rb for ext setup.
• Additional commits viewable in compare view

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