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AnyEvent::Impl::Tk(3) User Contributed Perl DocumentationAnyEvent::Impl::Tk(3)

NAME
       AnyEvent::Impl::Tk - AnyEvent adaptor for Tk

SYNOPSIS
	  use AnyEvent;
	  use Tk;

	  # this module gets loaded automatically as required

DESCRIPTION
       This module provides transparent support for AnyEvent. You don't have
       to do anything to make Tk work with AnyEvent except by loading Tk
       before creating the first AnyEvent watcher.

       Tk is buggy. Tk is extremely buggy. Tk is so unbelievably buggy that
       for each bug reported and fixed, you get one new bug followed by
       reintroduction of the old bug in a later revision. It is also basically
       unmaintained: the maintainers are not even interested in improving the
       situation - reporting bugs is considered rude, and fixing bugs is
       considered changing holy code, so it's apparently better to leave it
       broken.

       I regularly run out of words to describe how bad it really is.

       To work around the many, many bugs in Tk that don't get fixed, this
       adaptor dup()'s all filehandles that get passed into its I/O watchers,
       so if you register a read and a write watcher for one fh, AnyEvent will
       create two additional file descriptors (and handles).

       This creates a high overhead and is slow, but seems to work around most
       known bugs in Tk::fileevent on 32 bit architectures (Tk seems to be
       terminally broken on 64 bit, do not expect more than 10 or so watchers
       to work on 64 bit machines).

       Note also that Tk event ids wrap around after 2**32 or so events, which
       on my machine can happen within less than 12 hours, after which Tk will
       stomp on random other events and kill them. So don't run Tk programs
       for more than an hour or so.

       To be able to access the Tk event loop, this module creates a main
       window and withdraws it immediately. This might cause flickering on
       some platforms, but Tk perversely requires a window to be able to wait
       for file handle readyness notifications. This window is always created
       (in this version of AnyEvent) and can be accessed as
       $AnyEvent::Impl::Tk::mw.

SEE ALSO
       AnyEvent, Tk.

AUTHOR
	Marc Lehmann <schmorp@schmorp.de>
	http://home.schmorp.de/

perl v5.14.2			  2009-08-09		 AnyEvent::Impl::Tk(3)
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