Re: Infinite Loop with Glib::IO->add_watch()

* Mike Schilli <m perlmeister com> [2004-09-08 19:52]:
Gotcha. One other related question: In the examples, I
somewhere found the notion

     Gtk2::Helper->add_watch(fileno(READHANDLE), 'in', \&callback);

instead of

     Glib::IO->add_watch(fileno(\*READHANDLE), 'in', \&callback);

Are these equivalent or do you prefer one or the other?

I didn't know about Gtk2::Helper::add_watch so far. The
Gtk2::Helper doc is unhelpfully monosyllabic: 

    This method is a wrapper for Glib::IO->add_watch. The
    callback is called every time when it's safe to read from or
    write to the watched filehandle.

Looking at the source, it seems to be a Gtk1.x compatibility

    # In Gtk 1.x the callback was called also for the eof() /
    # pipe close events, but Gtk 2.x doesn't. We need to connect
    # to the G_IO_HUP event also to get this convenient behaviour
    # again.

That's all it does other than punting calls through to
Glib::IO::add_watch. It's either meant for porting old programs
that rely on the Gtk1.x behaviour, or as a convenience wrapper.

In any case, you should probably just use Glib::IO::add_watch if
you don't need that behaviour.

"If you can't laugh at yourself, you don't take life seriously enough."

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