/
fork_tracker.rb
64 lines (55 loc) · 1.26 KB
/
fork_tracker.rb
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# frozen_string_literal: true
module ActiveSupport
module ForkTracker # :nodoc:
module CoreExt
def fork(*)
if block_given?
super do
ForkTracker.check!
yield
end
else
unless pid = super
ForkTracker.check!
end
pid
end
end
ruby2_keywords(:fork) if respond_to?(:ruby2_keywords, true)
end
module CoreExtPrivate
include CoreExt
private
def fork(*)
super
end
ruby2_keywords(:fork) if respond_to?(:ruby2_keywords, true)
end
@pid = Process.pid
@callbacks = []
class << self
def check!
if @pid != Process.pid
@callbacks.each(&:call)
@pid = Process.pid
end
end
def hook!
if Process.respond_to?(:fork)
::Object.prepend(CoreExtPrivate)
::Kernel.prepend(CoreExtPrivate)
::Kernel.singleton_class.prepend(CoreExt)
::Process.singleton_class.prepend(CoreExt)
end
end
def after_fork(&block)
@callbacks << block
block
end
def unregister(callback)
@callbacks.delete(callback)
end
end
end
end
ActiveSupport::ForkTracker.hook!