class Async::Clock

def self.measure
	start_time = self.now
	
	yield
	
	return self.now - start_time
end

def self.now
	::Process.clock_gettime(::Process::CLOCK_MONOTONIC)
end

def self.start
	self.new.tap(&:start!)
end

def initialize(total = 0)
	@total = total
	@started = nil
end

def start!
	@started ||= Clock.now
end

def stop!
	if @started
		@total += (Clock.now - @started)
		@started = nil
	end
	
	return @total
end

def total
	total = @total
	
	if @started
		total += (Clock.now - @started)
	end
	
	return total
end