Re: Signal issues.

[muppet <scott asofyet org>]

On Dec 30, 2004, at 4:42 PM, Jan Hudec wrote:

> I just ran across an incompatible change in signal handling in perl 
> 5.7.3 and later, that causes problems when the Glib::MainLoop is 
> running. The problem is, that the new signal handling stuff defers 
> execution of the perl hooks until a "safe" place -- which never 
> happens when a Gtk::MainLoop sits in a poll. Please consider adding a 
> custom event handler (the poll is broken by the signal, so it should 
> run) to dispatch these handlers.

I thought i'd made a faq entry about this, but obviously i'm just 
imagining things again.  I've got to stop that.  Google says:
http://mail.gnome.org/archives/gtk-perl-list/2004-February/msg00111.html

This problem has existed with all versions of gtk2-perl, because we 
only work with perl >= 5.8.0.

Here's something from one of my apps that needs to have special SIGINT 
handling at certain times.  It uses a heartbeat timer only when the INT 
handler is installed, to avoid unnecessary load.

  my $signal_watcher;
  sub set_up_interrupt_handling {
     $SIG{INT} = \&my_special_int_handler;
     $signal_watcher = Glib::Timeout->add (100, sub {TRUE});
  }
  sub tear_down_interrupt_handling {
     delete $SIG{INT};
     Glib::Source->remove ($signal_watcher);
  }


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