2013/12/30 Thomas Rast <t...@thomasrast.ch>:
> Roman Kagan <rka...@mail.ru> writes:
>
>> + # workaround for a bug in svn serf backend (v1.8.5 and below):
>> + # store 3d argument to ->add_file() in a local variable, to make it
>> + # have the same lifetime as $fbat
>> + my $upa = $self->url_path($m->{file_a});
>> my $fbat = $self->add_file($self->repo_path($m->{file_b}), $pbat,
>> - $self->url_path($m->{file_a}), $self->{r});
>> + $upa, $self->{r});
>
> Hmm, now that you put it that way, I wonder if the patch is correct.
>
> Let me first rephrase the problem to verify that I understand the issue:
>
> $fbat keeps a pointer to the $upa string, without maintaining a
> reference to it. When $fbat is destroyed, it needs this string, so we
> must ensure that the lifetime of $upa is at least as long as that of
> $fbat.
No. The string is needed in subversion's close_file(), so we want to
keep it alive until close_file() returns. Surviving till the end of
the current function scope is sufficient for that.
> However, does Perl make any guarantees as to the order in which local
> variables are unreferenced and then destroyed?
We don't care about the order they are destroyed WRT each other.
Roman.
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