This module is an AnyEvent user, you need to make sure that you use and
run a supported event loop.
Loading this module will install the necessary magic to seamlessly
integrate BDB into AnyEvent, i.e. you no longer need to concern
yourself with calling BDB::poll_cb or any of that stuff (you still
can, but this module will do it in case you dont).
The AnyEvent watcher can be disabled by executing undef
$AnyEvent::BDB::WATCHER. Please notify the author of when and why you
think this was necessary.