On Thu, 2009-08-27 at 16:38 -0400, David Zeuthen wrote: > On Thu, 2009-08-27 at 08:09 +0000, Benjamin Otte wrote: > > In an async program, the > > same cancellable is often used for multiple calls at the same time. > > Be careful, however, to avoid using the same cancellable for multiple > simultaneous operations. The docs clearly state > > One GCancellable can be used in multiple consecutive operations, > but not in multiple concurrent operations. > > And here's why when I asked Alex why this is so > > <alexl> davidz: Take the case of two readers using the same cancellable > <alexl> davidz: the cancel will write to the pipe, etc > <alexl> davidz: with the right race condition, phase of the moon > etc, we may only wake up one of the threads
Hmmm, it was a long time since I wrote this... I don't immediately see any race conditions. The fd is level triggered, as is the win32 event, so two processes should both wake up as long as nobody calls g_cancellable_reset(). If we assume all implementations using the "cancelled" signal behave similarly then it *looks* safe, but I'd feel somewhat unconfortable with it. _______________________________________________ gtk-devel-list mailing list gtk-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-devel-list
