class Async::Reactor

def run(*args, &block)
	raise RuntimeError, 'Reactor has been closed' if @selector.nil?
	
	@stopped = false
	
	# Allow the user to kick of the initial async tasks.
	async(*args, &block) if block_given?
	
	@timers.wait do |interval|
		# - nil: no timers
		# - -ve: timers expired already
		# -   0: timers ready to fire
		# - +ve: timers waiting to fire
		interval = 0 if interval && interval < 0
		
		Async.logger.debug{"[#{self} Pre] Updating #{@children.count} children..."}
		# As timeouts may have been updated, and caused fibers to complete, we should check this.
		
		# If there is nothing to do, then finish:
		Async.logger.debug{"[#{self}] @children.empty? = #{@children.empty?} && interval #{interval.inspect}"}
		return if @children.empty? && interval.nil?
		
		Async.logger.debug{"Selecting with #{@children.count} fibers interval = #{interval}..."}
		if monitors = @selector.select(interval)
			monitors.each do |monitor|
				if fiber = monitor.value
					# Async.logger.debug "Resuming task #{task} due to IO..."
					fiber.resume # if fiber.alive?
				end
			end
		end
	end until @stopped
	
	return self
ensure
	Async.logger.debug{"[#{self} Ensure] Exiting run-loop (stopped: #{@stopped} exception: #{$!.inspect})..."}
	@stopped = true
end