Re: Bug Report: Locking X11 with FOX

Concerning the bug I reported about FOX hanging X11 by leaving the pointer grabbed when heavily loaded, I have found the following about the "FXChore" hang example:

1. In FXWindow::grab():
• XGrabPointer(...,getApp()->event.time) is returning 2 (GrabInvalidTime) so it then tries (as an error handling step?)
  
• XGrabPointer(...,CurrentTime) which returns 0.
2. In FXWindow::ungrab():
• Changing XUngrabPointer(DISPLAY(getApp()),getApp()->event.time) to XUngrabPointer(DISPLAY(getApp()),CurrentTime) prevents the problem. (I'm not suggest this the fix.)
  

The docs on XUngrabPointer() say it will NOT release the pointer if the specified time is earlier than the last-pointer-grab time or ...
I think what is happening is that with FOX way behind the XServer, the XGrabPointer(...,CurrentTime) sets the grab time to a larger time value than the time value of the event that FOX  (eventually) is processing when it does the XUngrabPointer(). Thus the time specified in the XUngrabPointer() is earlier than the grab time. Therefore the pointer is left grabbed.

What I have no explanation for at this time is just why XGrabPointer(...,getApp()->event.time) returns  GrabInvalidTime. The docs say "If the specified time is earlier than the last-pointer-grab time or later than the current X server time, it fails and returns GrabInvalidTime." Since this is the first grab, the first clause doesn't seem to apply, and since FOX seems to be using the time from the last XEvent containing a time, the time should not be ahead of the X server. Maybe somebody sees something I don't.

-- 
Hal Brand

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