Re: widget's signal callback: inside gdk lock?

["Brian J. Tarricone" <bjt23 cornell edu>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 9/19/2005 9:11 AM, Tristan Van Berkom wrote:
> Felix Kater wrote:
> [...]
>
> > a. The lock is already aquired by gtk when the button is toggled by
> > the user's mouse click--so the callback is already (automatically)
> > inside the lock from the client programmer's view.
> >
> > b. The lock has to be aquired explicitly by the client programmer who
> > is using gtk (in case she wants to access other gtk stuff savely).

[snip: rather long-winded explanation]

To put it simply, assuming you've initialised gthread and GDK's thread
system, here are the places you need to use
gdk_threads_enter()/gdk_threads_leave() pairs:

1.  In main(), surrounding gtk_main() (or all gtk/gdk calls, if you
create threads in main() before calling gtk_main()).

2.  In functions invoked via the GSource mechanism (e.g., g_idle_add(),
g_timeout_add(), etc.).

3.  In functions invoked in any thread that is not the main thread.

This is all assuming you're calling gtk/gdk functions.  If, for example,
you have an idle function that does not call gtk/gdk functions, there's
no need to acquire the GDK lock.

In any other case (including gtk signal callbacks), you do *not* need to
acquire the GDK lock.

        -brian

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.1 (MingW32)

iD8DBQFDL5W86XyW6VEeAnsRAvv4AKDLypn9gMYgq51YlnLqDmW5On1sAwCgpRc9
41y5WA/s69JZ+4eGodiFRDg=
=22hD
-----END PGP SIGNATURE-----