On Fri, 2008-06-20 at 12:02 +0800, HASWANI HARISH-VCKR47 wrote:
> Hi All,
>
> I want to know that whether all Clutter APIs are re-entrant or not?
> Or we need to call clutter_threads_enter() and
> clutter_threads_leave() before making call to clutter APIs.
>
Clutter operates under a single lock in a threaded environment; this
means that every API call updating the Clutter scenegraph must acquire
the Clutter lock with threads_enter() and release it with
threads_leave().
the interactions with threaded environments, the GLib main loop, GL and
Clutter are non-trivial, though, and can be barely portable. so it is
strongly advised that:
1. only the thread that invoked clutter_main() is allowed to
operate on the Clutter scenegraph;
2. every other thread that wants to operate on the scenegraph
should add an idle or a timeout callback on the main loop
which are guaranteed to be executed in the same thread as
the main loop is.
there is a full example inside Clutter of this pattern, called
test-threads.c.
the behaviour or Clutter is similar to the one used by GDK, so the
documentation at:
http://library.gnome.org/devel/gdk/stable/gdk-Threads.html
is also a valid starting point.
ciao,
Emmanuele.
--
Emmanuele Bassi, OpenedHand Ltd.
Unit R, Homesdale Business Centre
216-218 Homesdale Rd., Bromley - BR12QZ
http://www.o-hand.com
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