From: Pierre Brengard <pbrengard@...>
Date: 2002-07-12T20:01:47+09:00
Subject: Re: Destructors in Ruby

what about using Mutex ?

Wejn wrote:
> Hi all,
>   I have following class:
> 
> class Foo
> 	def initialize
> 		@locked = false
> 	end
> 
> 	def lock
> 		return if @locked
> 		# Set up exclusive-write lock
> 		@locked = true
> 	end
> 
> 	def do_something
> 		raise RuntimeError, "Not locked" unless @locked
> 		# Do something if locked
> 	end
> 
> 	def unlock
> 		return unless @locked
> 		# Free that lock
> 		@locked = false
> 	end
> end
> 
> Is there any way I can ensure that 'unlock' will be called at the end of
> instance lifetime (before GC will purge it out of mem)? I need this
> feature because I can't leave the external resource locked and I can't
> trust to other code to release (unlock) it correctly.
> 
> Thanks in advance,
>                       W.