class Async::Scheduler

@returns [Task] The initial task that was scheduled into the reactor.
@yields {|task| ...} The top level task, if a block is given.

@public Since *Async v1*.

Forwards all parameters to {#async} if a block is given.

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?
	
	begin
		@profiler&.start
		
		initial_task = self.async(...) if block_given?
		
		self.run_loop do
			run_once
		end
		
		return initial_task
	ensure
		@profiler&.stop
	end
end