class Async::Task

def self.current
	Thread.current[:async_task] or raise RuntimeError, "No async task available!"
end

def bind(io)
	@ios[io.fileno] ||= reactor.wrap(io, self)
end

def close
	@ios.each_value(&:close)
end

def initialize(ios, reactor, &block)
	@ios = Hash[
		ios.collect{|io| [io.fileno, reactor.wrap(io, self)]}
	]
	
	@reactor = reactor
	
	@fiber = Fiber.new do
		set!
		
		begin
			yield(*@ios.values, self)
			# Async.logger.debug("Task #{self} completed normally.")
		rescue Interrupt
			# Async.logger.debug("Task #{self} interrupted: #{$!}")
		ensure
			close
		end
	end
end

def register(io, interests)
	@reactor.register(io, interests)
end

def run
	@fiber.resume
		
	return @fiber
end

def set!
	# This is actually fiber-local:
	Thread.current[:async_task] = self
end

def stop!
	if @fiber.alive?
		exception = Interrupt.new("Stop right now!")
		@fiber.resume(exception)
	end
end

def with(io)
	wrapper = @reactor.wrap(io, self)
	
	yield wrapper
ensure
	wrapper.close
	io.close
end