Hi, Many/most GUI toolkits implement pop up menus using grabs. This can cause major desktop lockups when debugging GUI applications, because hitting breakpoints in pop up menu callback code will occur while a grab is active.
Reaching a breakpoint while a grab is active indefinitely locks up the X server, leaving a standalone desktop user the only option but to power down and suffer potential data loss. Up until recently, the AllowDeactivateGrabs functionality could be configured such that the grabs could be deactivated with certain keystrokes, but this functionality has now been removed from the X server in the following change http://cgit.freedesktop.org/xorg/xserver/commit/?id=5e43cd28692bc05cac80f38b47104a26c0524385 Given the absence of the above functionality, where grabs are used by underlying GUI libraries, it is impossible to debug popup menu callback code where the debugger and the application are running in the same X server due to grab lockout. This appears to be a critical issue. I draw your attention to consideration of this matter....is there a way that the X server could be enhanced to recognise processes that have been suspended and automatically cancel their grabs and avoid this problem? Should the AllowDeactivateGrabs functionality be restored in the interim while a full solution is thought through? Others have raised these issues: http://bugs.freedesktop.org/show_bug.cgi?id=21652 https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/338489 Thanks, -- Dave Campbell _______________________________________________ xorg mailing list xorg@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/xorg