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Returns a list of all watchers (including stopped watchers).

=item all_running()

Returns a list of all watchers with actively running callbacks.
Watchers are returned in order of most recent to least recent.

=item all_idle()

Returns a list of all the idle watchers.
If the event queue is very busy, all the idle watchers will sit on the
idle queue waiting to run.  However, be aware that if an idle watcher
has the C<max> attribute set then it will queue a normal event when
its C<max> wait time is exceeded.

=item queue_pending()

Examines asynchronous source events (timers & signals) and reifies
them as target events. C<queue_pending()> is only called implicitly by
C<sweep()> and C<one_event()>.  Otherwise, C<queue_pending()> is not
called implicitly.