From: Jakub Narebski <jnareb@gmail.com>
Date: Fri, 10 Dec 2010 00:47:19 GMT
Subject: Re: [PATCH 12/18] gitweb: Change file handles (in caching) to lexical variables as opposed to globs
Message-ID: <201012100147.20747.jnareb@gmail.com>
In-Reply-To: <7vwrnieac8.fsf@alter.siamese.dyndns.org>

On Fri, 10 Dec 2010, Junio C Hamano wrote:
> Jakub Narebski <jnareb@gmail.com> writes:
>> "John 'Warthog9' Hawley" <warthog9@eaglescrag.net> writes:
>>> 
>>> +# Global declarations
>>> +our $cacheFile;
>>> +our $cacheFileBG;
>>> +our $cacheFileBinWT;
>>> +our $cacheFileBin;
>>
>> You are trading globs for global (well, package) variables.  They are
>> not lexical filehandles... though I'm not sure if it would be possible
>> without restructuring code; note that if variable holding filehandle
>> falls out of scope, then file would be automatically closed.
> 
> Hmm. why is it a bad idea, when you need to access these from practically
> everywhere, to use global variables to begin with?  To a certain degree,
> it sounds like an unnecessary burden without much gain to me.

If you check my rewrite of gitweb output caching:

  "[PATCHv6/RFC 00/24] gitweb: Simple file based output caching"
  

http://repo.or.cz/w/git/jnareb-git.git/shortlog/refs/heads/origin..refs/heads/gitweb/cache-kernel-v6
https://github.com/jnareb/git/compare/origin...gitweb/cache-kernel-v6

you would see that I always use lexical filehandles, and I never need
to use global variables / glob filehandles.

http://en.wikipedia.org/wiki/Global_variables
-- 
Jakub Narebski
Poland