Move logic to decide if an MPM is supported, and whether the MPM is threaded, down to the MPM itself. (server/mpm/FOO/config.m4, which runs before the actual MPM selection) server/mpm/config.m4 makes some general platform checks that can be used for MPM decisions, and contains some functions related to MPMs. XXX The check here for whether APR_POLLSET_THREADSAFE is available is a rough approximation and needs to be replaced by a run-time check. Replace the limited per-platform hard-coded MPM selection and the current defaulting to event (whether or not it works) with a selection based on which MPMs work on the platform, as reported by the MPMs themselves. (config2.m4, which runs after the MPMs record whether they are supported) Order of preference: WinNT (mingw32 only) then Event then Worker then Prefork