So what should we do about it?
I suppose we could make it get/set at startup time
perhaps, but most people have asked for writability at request time, not startup time.
and get/set at all times for non-threaded mpms and only get for threaded mpms, like we did with a few other struct accessors (to see those run):
grep -Ir '\$' xs/maps/
it sounds like document_root falls into the same group as all the accessors above. Or doesn't it?
I don't ever claim to understand threads, but if there is a mechanism in place to have ro for threaded mpms and rw for prefork then I think that's a good way to go at the moment.
Right, but before that I think what needs to be checked is mod_userdir, since it's supposed to somehow let the other parts of Apache know of a different document root.
I think the idea we had before is to extend $r to have a private entry of document_root, so it can be per-request. Of course that mod_perl-specific entry will be visible only to mod_perl modules.
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