class Async::Scheduler

def run(...)

Run the reactor until all tasks are finished. Proxies arguments to {#async} immediately before entering the loop, if a block is provided. 
def run(...)
	Kernel.raise ClosedError if @selector.nil?
	
	initial_task = self.async(...) if block_given?
	
	self.run_loop do
		run_once
	end
	
	return initial_task
end