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. On a graceful shutdown, this would allow watchdogs to fully complete any ongoing task before things start to disappear in the process. Thoughts? Kind Regards, Stefan
