Re: Re: safe and $self

in reply to Re: safe and $self
in thread safe and $self

I finally signed up for an account (instead of just lurking), so I'm the anonymous monk that posted this node. the code I have is:

sub codewrapper {
        my $self = shift;
        $self->{code}->share('$self');
        $self->{code}->share('$test');
        $code=$_[0];
        $self->{code}->reval($code);
        $test->{code}->reval($code);
}
[download]

$test is the test object, and that gives the same error, it is declared with my $test = ..., but outside of any subs. neither work, both produce eval errors.

Comment on Re: Re: safe and $self Download Code

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Re: Re: Re: safe and $self by djantzen (Priest) on Nov 27, 2002 at 02:09 UTC
So I take it `$self->{code}` contains a reference to an instance of Safe. Again, if `$test` is declared using my, it is a lexical variable and hence cannot be shared with the code inside of the compartment. See these nodes for more on dynamic versus lexical variables: What's the difference between dynamic and lexical (static) scoping? Between local() and my()? and Lexical vs. Package Variables (With a little local thrown in).	[reply] [d/l] [select]
Re^3: safe and $self by tadman (Prior) on Nov 27, 2002 at 05:57 UTC
I think, like what fever said, that you've painted yourself in to a corner with this. `$self` is a lexical variable, in other words, it doesn't really exist outside of the `codewrapper` function, those seven lines. The real problem is if you are ever calling the `codewrapper` function within itself. Then you're going to have trouble sharing the correct `$self` since there will, at that point, be two of them. The solution might be to not use Safe at all. It might be best to re-engineer your application, since using eval, and presumably `reval` are much slower than the alternatives. If this isn't going to work, then what you're probably going to have to do is create separate compartments for each object. I'm not sure if there's an easy way to do this or not.	[reply] [d/l] [select]
Re: Re^3: safe and $self by feanor_269 (Beadle) on Nov 27, 2002 at 17:52 UTC
Unfortunately, since I have to eval perl code from untrusted sources (this would be for a mud, and they would be the builders and imms... see what I mean by untrustworthy?) I have to use safe and reval. speed isn't horribly important either. I'm going to play with making an array of the references to each object and just sharing that locally (Altho maybe just as a package variable?) anyway, class, no time now.	[reply]

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