On Wed, Dec 01, 2010 at 05:41:00PM +0100, Francesco Abbate wrote: > 2010/12/1 Pauli Nieminen <suok...@gmail.com>: > > On Tue, Nov 30, 2010 at 6:22 PM, Joris Dobbelsteen > > <joris.dobbelst...@sioux.eu> wrote: > >> Hi all, > >> > >> I'm looking for some expert opinion to verify a possible cause of our > >> problems. > >> > >> After further investigation of the issue the following is found: > >> We do all our X drawing on a single thread. > >> However, DirectFB (used due to legacy reasons) creates a second thread > >> for reading inputs (events). > >> > >> Could this multi-threaded usage of libX11 cause it to hang? > >> > >> What we see is that our drawing thread gets stuck in a poll on the > >> socket while calling _XReply (after _XReply has called _XSend). However, > >> a second thread is seen reading from a socket for inputs. > >> > > > > Does someone set the connection to thread safe mode? > > > > If yes then xcb might be causing the problem. > > > > Hi, > > I've also seen this problem which is related to the xcb implementation > of libX11. The problem arise when two different threads try to use the > same connection with one thread polling events and the other sending > drawing commands. This happens even if you called XInitThreads. > > Here the threads (largely ignored by xcb developers): > > http://lists.freedesktop.org/archives/xcb/2010-October/006518.html > http://lists.freedesktop.org/archives/xorg/2010-September/051323.html
We likely didn't see the one on the xorg list; some XCB developers monitor xorg-devel, but I don't know that any subscribe to xorg. It looks like the xcb thread got sidetracked by a discussion of native usage of XCB, and failed to address the original bug. Sorry about that. I'll follow up in the new thread you just started. - Josh Triplett _______________________________________________ xorg-devel@lists.x.org: X.Org development Archives: http://lists.x.org/archives/xorg-devel Info: http://lists.x.org/mailman/listinfo/xorg-devel
