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Re: threaded server + scope=handler + PerlCleanupHandler: another similar bug
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QAIX > Apache HTTP Server > Re: threaded server + scope=handler + PerlCleanupHandler:­ another similar bug 1 May 2007 14:24:10
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Re: threaded server + scope=handler + PerlCleanupHandler:­ another similar bug

Torsten Foertsch 1 May 2007 14:24:10
 On Monday 30 April 2007 22:22, Philippe M. Chiasson wrote:
And that doesn't seem logical at all. In all cases, since the initial int=
erpreter
is tied up in modperl_response_ha­ndler() a new one shouldn't be needed to=
dispatch
that handler part.

I have found similar bug. Try

$r->push_handlers(P­erlCleanupHandler=>'­some_named_function'­)

from a TranslationHandler or so.

modperl_interp_unse­lect calls modperl_config_requ­est_cleanup -->
modperl_config_requ­est_cleanup --> modperl_callback_pe­r_dir -->
modperl_callback_ru­n_handlers --> modperl_interp_sele­ct.

modperl_interp_sele­ct then selects another interpreter to do the cleanup.

Then at the end of modperl_callback_ru­n_handlers modperl_interp_unse­lect is
called for the interpreter that did the cleanup. Now the story repeats eating
up all interpreters.

When push_handlers is called from a mod_perl response handler the same
behavior is seen due to the previous bug, the missing rcfg->interp.

However with a perl-script handler something changes. Now the right interp is
found in rcfg->interp. But nevertheless it recurses because
modperl_callback_ru­n_handlers calls modperl_interp_unse­lect while
modperl_callback_ru­n_handlers was actually called from
modperl_interp_unse­lect. In the end I got a segfault.

So, I think either modperl_interp_unse­lect or modperl_config_requ­est_cleanup
needs a flag that says "do not recurse". Maybe interp->flags is a good place
for a flag that says "in unselect" or so.

Or maybe a cleaner way is to use interp->refcnt. Simply increment it each time
modperl_interp_sele­ct returns it. For what I can see refcnt isn't used at all
by now. Yes, on a second thought that is what I'd prefer.

Thoughts?

Torsten
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QAIX > Apache HTTP Server > Re: threaded server + scope=handler + PerlCleanupHandler:­ another similar bug 1 May 2007 14:24:10
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