On Jul 17 22:31, Jon TURNEY wrote: > On 19/06/2013 23:39, Yaakov (Cygwin/X) wrote: > > There appears to be a bug in the MIT-SHM extension with the 64-bit > > xserver; both XWin and Xvfb have manifested this so far. The easiest way to > > trigger this is to install gnome-themes-standard, add > > gtk-theme-name="Adwaita" to your ~/.gtkrc-2.0, then start a GTK+2 program > > (e.g. gtk-demo), but GTK+3 programs also show this. Starting the server > > with -extension MIT-SHM, or using a 32-bit server even with MIT-SHM, works > > fine. > > On 06/07/2013 15:28, Jon TURNEY wrote: > > On 06/07/2013 12:46, Ken Brown wrote: > >> On 64bit Cygwin, if I try to run emacs under X11 while cygserver is > >> running, > >> emacs fails to connect to the X server. The error message from the X > >> server is > >> > >> BadShmSeg (invalid shared segment parameter) on protocol request 131 > >> > >> To reproduce: > >> > >> 1. Install the current version of emacs-X11 (24.3-4). > >> > >> 2. Start the (64bit) cygserver service. > >> > >> 3. Start the (64bit) X server, e.g., by typing "startxwin" in a Cygwin > >> Terminal. > >> > >> 4. In the resulting xterm, try to start emacs: > >> > >> $ emacs-X11.exe -Q & > >> > >> The result is that emacs displays the error message above and then aborts. > >> > >> emacs-X11 works fine if the X server is started when cygserver is not > >> running. > > > > Yup, there's some kind of bug which affects SHM use by the X server on > > 64bit. > > I am looking into it. > > > > You can also work around this by starting the X server with '-extension > > MIT-SHM' > > After going around in circles on this a few times, this is what I now think I > know: > > The proximate cause of this error is that the x86_64 libcairo2 package appears > to be built with IPC_RMID_DEFERRED_RELEASE defined, which should only happen > on systems which allow processes to shmat() to a shared memory segment which > has already been marked for deletion with shmctl(IPC_RMID) (A non-portable > Linux behaviour) > > (This behaviour can be turned on in cygwin by setting the > 'kern.ipc.shm_allow_removed' to 'yes' in /etc/cygserver.conf, so that is also > a work around) > > Attached is the configure test extracted from cairo, which for some reason > functions incorrectly on x86_64.
I'm glad to read it's not a bug in Cygwin or Cygserver :} Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Maintainer cygwin AT cygwin DOT com Red Hat
