> Am 23.02.2022 um 11:52 schrieb Ruediger Pluem <[email protected]>:
>
>
>
> 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?
child_is_stopping is called when the shutdown is initiated.
child_is_exiting would be called before pool destruction begins.
The difference is that between those two, ongoing requests are still being
served on graceful shutdowns.
>
> Regards
>
> Rüdiger
