From: Eleanor McHugh <eleanor@...>
Date: 2009-04-03T06:46:37+09:00
Subject: Re: Nilling for GC

On 2 Apr 2009, at 21:14, Paganoni wrote:
> le 02/04/2009 10:27, Eleanor McHugh nous a dit:
>
>> You could write something like:
>> 	def thread_dead? worker
>> 		(Time.now - worker[:started_at] > 5) && (worker[:thread].status  
>> ==  false)
>> 	end
>> 	@semaphore.synchronize do
>> 		hs.delete_if do |k, v|
>> 			v.map! { |worker| thread_dead?(worker) ? (cleaned += 1; nil) :   
>> worker }.compact!
>> 			v.empty?
>> 		end
>> 	end
>
> Your delete_if solution is quite elegant because self explanatory !

Thank you :)

The delete_if could also be written as a one-liner, but it looks uglier:

	hs.delete_if { |k, v| (v.map! { |worker| thread_dead?(worker) ?  
(cleaned += 1; nil) :  worker }.compact! || v).empty? }

It always bugs me that compact! returns nil if no changes occur,  
rather than the enum as I seem to use this particular idiom a lot *sigh*


Ellie

Eleanor McHugh
Games With Brains
http://slides.games-with-brains.net
----
raise ArgumentError unless @reality.responds_to? :reason