On Tue, 2009-03-17 at 03:39 -0700, Thomas Hellstrom wrote: > Thomas Hellström wrote: > > Hi! > > > > I'm currently looking into the thread-safety of the dri drivers. In > > particular the calls to libX11. > > > > It appears that many of the applications I've tried have issues with > > deadlocks in the XCB code. > > It looks like this might be an issue with the locking order of > > XLockDisplay() and driver mutexes. > > > > In particular, if the application protects all glx calls with > > XLockDisplay() the driver might deadlock in a normal GL call: > > > > Thread A: > > XLockDisplay() -> glxXXX -> driver mutex -> Xlib call -> Xcb XLockdisplay(). > > Thread B > > Normal GL call -> driver mutex -> Xlib call -> Xcb XLockDisplay(). > > > > So we have a locking order reversal between the driver mutex and > > XLockDisplay which causes a deadlock. > > > > Now, it seems like a simple away around this would be to omit the > > application XLockDisplays() completely. However, that seems to cause > > issues with XPending and XNextEvent eating the reply data meant for > > XSync(), leaving XSync waiting locked in a select(). > > > > I guess the remedy is to have the DRI utility routines and drivers > > protect _all_ X calls with XLockDisplay(). > > > > Does anyone have thoughts / insights about this? > > > > Thanks, > > Thomas > > > > > > > Hmm, > I installed a non-XCB Xlib and all problems just vanished... > Don't mind the above.
So is this a XCB problem? Jose ------------------------------------------------------------------------------ Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are powering Web 2.0 with engaging, cross-platform capabilities. Quickly and easily build your RIAs with Flex Builder, the Eclipse(TM)based development software that enables intelligent coding and step-through debugging. Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com _______________________________________________ Mesa3d-dev mailing list Mesa3d-dev@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mesa3d-dev
