On 2/23/22 11:39 AM, Stefan Eissing wrote:
> One thing that is currently missing is a way to shutdown/reap/join module
> threads when the mpm exits.
>
> Example:
>
> mod_watchdog creates several threads post_config which are only joined on
> pool destruction.
>
> Problem:
>
> pool destruction is not ordered between modules and dependencies on order are
> not
> fully known. This leads to crashes in OpenSSL, for example, when mod_ssl is
> destructed
> before all watchdogs using OpenSSL are joined (OpenSSL 3.x seems to do better
> on this,
> but the point remains valid).
>
> There has been attempts by Yann to make a patch that make the OpenSSL
> termination
> way later (adding it to a 'higher' pool destruction). But that would only
> solve
> this particular problem and not any other 3rd party dependency.
>
> Proposal:
>
> Add a hook 'child_exiting(int graceful)' where modules can register
> and do their own thread join/reap.
How does that differ from the child_stopping hook? Or is child_stopping only
used when we shutdown the whole httpd not just one child?
Regards
Rüdiger
