NAME

MPMs - Multi-Processing Model Modules

Description

Discover what are the available MPMs and how they work with mod_perl.

META: This doc is under construction. Owners are wanted. -- pgollucci volunteering

MPMs Overview

The Worker MPM

META: incomplete

You can test whether running under threaded env via: ?

#ifdef USE_ITHREADS
/* whatever */
#endif

When the server is running under the threaded mpm scfg->threaded_mpm is set to true.

Caveats:

All per-server data is shared between threads, regardless of locking, changing the value of something like ap_document_root changes it for all threads. Not just the current process/request, the way it was in 1.3. So we can't really support modification of things like ap_document_root at request time, unless the mpm is prefork. we could support modification of modperl per-server data by using r->request_config in the same way push_handlers et al is implemented. But it is not possible to use this approach for anything outside of modperl (ap_document_root for example).

The Prefork MPM

META: incomplete

The Event MPM

Maintainers

Maintainer is the person(s) you should contact with updates, corrections and patches.

• Philip M. Gollucci <pgollucci (at) p6m7g8.com>

Authors

• Stas Bekman <stas (at) stason.org> Philip M. Gollucci <pgollucci (at) p6m7g8.com>

Only the major authors are listed above. For contributors see the Changes file.