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POE's spurious messages when it detects these cases.

Unfortunately, POE isn't generic enough to implement a fully working
AnyEvent backend: POE is too badly designed, too badly documented and too
badly implemented.

Here are the details, and what it means to you if you want to be
interoperable with POE:

=over 4

=item Weird messages

If you only use C<run_one_timeslice> (as AnyEvent has to for its
condition variables), POE will print an ugly, unsuppressible, message at
program exit:

   Sessions were started, but POE::Kernel's run() method was never...

The message is correct, the question is why POE prints it in the first
place in a correct program (this is not a singular case though).

AnyEvent consequently patches the POE kernel so it thinks it already
ran. Other workarounds, even the one cited in the POE documentation
itself, have serious side effects, such as throwing away events.

The author of POE verified that this is indeed true, and has no plans to
change this.

POE has other weird messages, and sometimes weird behaviour, for example,
it doesn't support overloaded code references as callbacks for no apparent
reason.

=item One POE session per Event

AnyEvent has to create one POE::Session per event watcher, which is
immensely slow and makes watchers very large. The reason for this is
lacking lifetime management (mostly undocumented, too). Without one
session/watcher it is not possible to easily keep the kernel from running
endlessly.

This is not just a problem with the way AnyEvent has to interact with
POE, but is a principal issue with POEs lifetime management (namely
that stopping the kernel stops sessions, but AnyEvent has no control
over who and when the kernel starts or stops w.r.t. AnyEvent watcher
creation/destruction).

From benchmark data it is not clear that session creation is that costly,
though - the real inefficiencies with POE seem to come from other sources,
such as event handling.

=item One watcher per fd/event combo

POE, of course, suffers from the same bug as Tk and some other badly
designed event models in that it doesn't support multiple watchers per
fd/poll combo. The workaround is the same as with Tk: AnyEvent::Impl::POE
creates a separate file descriptor to hand to POE, which isn't fast and
certainly not nice to your resources.

Of course, without the workaround, POE also prints ugly messages again
that say the program *might* be buggy.

While this is not good to performance, at least regarding speed, with a
modern Linux kernel, the overhead is actually quite small.

=item Timing deficiencies

POE manages to not have a function that returns the current time. This is
extremely problematic, as POE can use different time functions, which can
differ by more than a second - and user code is left guessing which one is
used.

In addition, most timer functions in POE want an absolute timestamp, which
is hard to create if all you have is a relative time and no function to
return the "current time".

And of course POE doesn't handle time jumps at all (not even when using
an event loop that happens to do that, such as L<EV>, as it does its own
unoptimised timer management).

AnyEvent works around the unavailability of the current time using
relative timers exclusively, in the hope that POE gets it right at least
internally.

=item Lack of defined event ordering

POE cannot guarantee the order of callback invocation for timers, and
usually gets it wrong. That is, if you have two timers, one timing out
after another (all else being equal), the callbacks might be called in
reverse order.

How one manages to even implement stuff that way escapes me.

=item Child watchers

POE offers child watchers - which is a laudable thing, as few event loops
do. Unfortunately, they cannot even implement AnyEvent's simple child
watchers: they are not generic enough (the POE implementation isn't even
generic enough to let properly designed back-end use their native child
watcher instead - it insist on doing it itself the broken way).

Unfortunately, POE's child handling is inherently racy: if the child exits
before the handler is created (because e.g. it crashes or simply is quick
about it), then current versions of POE (1.352) will I<never> invoke the
child watcher, and there is nothing that can be done about it. Older
versions of POE only delayed in this case. The reason is that POE first
checks if the child has already exited, and I<then> installs the signal
handler - aa classical race.

Your only hope is for the fork'ed process to not exit too quickly, in
which case everything happens to work.

Of course, whenever POE reaps an unrelated child it will also output a
message for it that you cannot suppress (which shouldn't be too surprising
at this point). Very professional.

As a workaround, AnyEvent::Impl::POE will take advantage of undocumented
behaviour in POE::Kernel to catch the status of all child processes, but
it cannot guarantee delivery.

How one manages to have such a glaring bug in an event loop after ten