http://people.apache.org/~trawick/loadable_mpms.txt
(you'll find additional stuff I forgot/didn't realize before long)
something I'm in a relative hurry to get feedback on is this part:
2. retain data
How can MPMs retain data across unload of the DSO?
s->process->server_pool userdata
won't work as-is because there's no server_rec in the pre_config hook.
Proposal: Add ap_set_retained_data(key, value),
ap_get_retained_data(key) APIs
(implementation detail: it will set/get userdata on pglobal)
Although not necessary, provide ap_get_config_count()
(better name!) to
indicate how many passes of config have completed. (The
interface could be
a global variable, but some third-party module would
inevitably clear it.)
