# Apache MPM event | [说明](#calibre_link-11) | An experimental variant of the standard `worker` MPM | | --- | --- | | [状态](#calibre_link-12) | MPM | | [模块名](#calibre_link-13) | mpm_event_module | | [源文件](#calibre_link-14) | event.c | ### 概述 ### 警告 This MPM is experimental, so it may or may not work as expected. To use the `event` MPM, add `--with-mpm=event` to the `configure` script's arguments when building the `httpd`. This MPM depends on [APR](#calibre_link-318 "see glossary")'s atomic compare-and-swap operations for thread synchronization. If you are compiling for an x86 target and you don't need to support 386s, or you are compiling for a SPARC and you don't need to run on pre-UltraSPARC chips, add `--enable-nonportable-atomics=yes` to the `configure` script's arguments. This will cause APR to implement atomic operations using efficient opcodes not available in older CPUs.