Sleep Hook

[tleish]

In using Falcon, does async include a hook to monkey-patch Kernel#sleep with Async#sleep?

em-synchrony has the following hook/logic you can add to your code if using something like Goliath.

# Redirects to EM::Synchrony.sleep
require "em-synchrony"
EM::Synchrony.on_sleep do |*args|
  EM::Synchrony.sleep(*args)
end

• EM::Synchrony#on_sleep
• Kernel#em_synchrony_sleep_hook

[ioquatix]

On Ruby 3.1+ and Async 2+, Kernel::sleep is redirected to the event loop

CRuby: https://github.com/ruby/ruby/blob/fb4df44d1670e9d25aef6b235a7281199a177edb/process.c#L5162-L5170

Async:

async/lib/async/scheduler.rb

Lines 151 to 158 in 2c5f92e

	# @asynchronous May be non-blocking..
	def kernel_sleep(duration = nil)
	if duration
	self.block(nil, duration)
	else
	self.transfer
	end
	end

[tleish]

Is there a way to do this with older versions of Ruby? (We a have not upgraded to Ruby 3 yet).

[ioquatix]

Yes, the compatible method is:

Async do |task|
  task.sleep(n)
end

or

if task = Async::Task.current?
  task.sleep(n)
else
  sleep(n)
end