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# frozen_string_literal: true
# Released under the MIT License.
# Copyright, 2025, by Shopify Inc.
# Copyright, 2025, by Samuel Williams.
module Async
# Private module that hooks into Process._fork to handle fork events.
#
# If `Scheduler#process_fork` hook is adopted in Ruby 4, this code can be removed after Ruby < 4 is no longer supported.
module ForkHandler
def _fork(&block)
result = super
if result.zero?
# Child process:
if Fiber.scheduler.respond_to?(:process_fork)
Fiber.scheduler.process_fork
end
end
return result
end
end
private_constant :ForkHandler
# Hook into Process._fork to handle fork events automatically:
unless RUBY_VERSION > "4"
::Process.singleton_class.prepend(ForkHandler)
end
end
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