On Thu, Apr 10, 2008 at 09:12:21AM +0100, John M Collins wrote: > I have spent most of a day looking at the various documents about > emitting signals and articles here without finding the answers to the > questions - sorry if they seem stupid as I'm a comparative newcomer to > GTK. > > I am converting an application to use GTK+ which receives messages from > a daemon process using signals - i.e. OS signals not the signals in GTK. > > The signals are sent by the daemon process to tell the receiving clients > "you might want to refresh your display". It is for the receiving > clients to worry about whether they do need to refresh their displays > (the actual data is in shared memory). > > My first question is: Is it safe to emit a signal (i.e. the GTK idea of > a signal) within the OS-signal handling routine?
No. You should get rid of the OS-signal handling mechanism. Use a file descriptor, a socket (UDP) or something, register a callback to this and update in the ordinary mannor. Signals is a nucience. You should keep syctronication on file descriptor. The daemon process then send a UDP (Multicast) message to the clients. If you want I can give you an example. > If not, it looks as if the only standard way is to have the OS > signal-catching routine just turn on "had_a_signal" and use > g_timeout_add to call a function which looks at "had_a_signal". Or is > there a better way? > > If it is OK to emit a signal please could someone confirm my > understanding of "events" in GTK. (I'd appreciate it if someone could > confirm my understanding in any case). > > Am I right in thinking that if I want to emit a client event (which > seems to be an appropriate thing to emit) I can either put: > > g_signal_emit_by_name(G_OBJECT(window), "client_event"); > > Or I set up a GdkEvent and put > > g_signal_emit_by_name(G_OBJECT(window), "event", &event, > &retval); > > Unfortunately the documentation such as there is talks about using > gtk_signal_emit_by_name but the documentation of that says it's > deprecated and I should use g_signal_emit_by_name. > > Or is there is some altogether better way of doing all this that I > haven't thought of? Please note rewriting the daemon process is not > currently an option. You should! It is a small difference. And WERY worthwhile. > > John Collins <[EMAIL PROTECTED]> Skype: toadwarbler > Xi Software Ltd www.xisl.com > > Tel: +44 (0)1707 886110 (Direct) > +44 (0)7799 113162 (Mobile) > > Registered in England & Wales Company Number 1977148 VAT: GB 403 9239 64 > > Trading Address: 3 Mandeville Rise, Welwyn Garden City, Herts, AL8 7JT, UK > Reg Office: 2 Mill Road, Haverhill, Suffolk, CB9 8BD, UK > > _______________________________________________ > gtk-app-devel-list mailing list > gtk-app-devel-list@gnome.org > http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list -- Göran Hasse ---------------------------------------------------------------- Göran Hasse email: [EMAIL PROTECTED] Tel: 08-6949270 Raditex AB http://www.raditex.se Planiavägen 15, 1tr Mob: 070-5530148 131 34 NACKA, SWEDEN OrgNr: 556240-0589 VAT: SE556240058901 ------------------------------------------------------------------ _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
