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Re: Re: Memory Management and Array references

by crabbdean (Pilgrim)
on May 25, 2004 at 21:05 UTC ( #356371=note: print w/replies, xml ) Need Help??

in reply to Re: Memory Management and Array references
in thread Memory Management and Array references

I'm sorry but that's not helpful at all. I showed an awareness that the problem was because of how I coded it and how Perl was handling the Memory Management based on how I coded it. $self->{files} is deleted when object goes out of scope. Its the abandoned references to the arrays within the $self->{files} that is the problem. Can you offer any advice on how to solve that problem? That would be helpful.

The Funkster of Mirth
Programming these days takes more than a lone avenger with a compiler. - sam
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Re: Re: Re: Memory Management and Array references
by hv (Parson) on May 25, 2004 at 21:58 UTC

    Any structure will be freed in perl when the last reference to it goes away; in your iterator, when you've exhausted the top-level directory and start working on the next you have:

    if( opendir( DIR, $dir ) ) { $self->{files}= [ map { File::Spec->catfile( $dir, $_ ); } File::Spec->no_upwards( readdir(DIR) ) ]; closedir DIR; } else { ... {

    At that point, when you assign a new arrayref to $self->{files}, the previous arrayref in that spot is overwritten and therefore its reference count is reduced - if that was the only reference to the previous arrayref, it will automatically be freed.

    So, to free unneeded memory in perl all you need to do - all you should do - is precisely to remove all references to the data.

    I suspect therefore that the problem is not where you think it is. I suggest that you step back and compose a new question - start off by telling us what makes you think you are leaking memory, and what in the process of tracking that down led you to believe the problem lay here.


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