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.
/Thomas > > > > ------------------------------------------------------------------------------ > 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 > ------------------------------------------------------------------------------ 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
