class Async::Reactor

running.
the block as an asynchronous task. Will block until the reactor finishes
- When invoked at the top level, will create and run a reactor, and invoke
asynchronously. Will return the task once it has been scheduled.
- When invoked within an existing reactor task, it will run the given block

The preferred method to invoke asynchronous behavior at the top level.

def self.run(*arguments, **options, &block)
	if current = Task.current?
		return current.async(*arguments, **options, &block)
	else
		reactor = self.new
		
		begin
			return reactor.run(*arguments, **options, &block)
		ensure
			reactor.close
		end
	end
end