Date: Thu, 19 Jan 1995 07:38:40 -0500 (EST)
From: Heasley <heasleka AT ptbma DOT usbm DOT gov>
Subject: program crashes with mouse movement?
To: djgpp AT sun DOT soe DOT clarkson DOT edu

I have written a program with a GUI using DJGPP 1.11m5, libgrx1.03m1 and 
SUIT from the UVA.  At certain places in the program large data files are 
being read or written.  If the mouse is moved sufficiently during one of 
these disk writing periods the program crashes.

The location of the crashs according to symify is:
  _GrP8PixCopy+942
  _GrEraseCursor+60
  _GrMoveCursor+272
  _rawclock+500
  ...

Subsequently, I have turned the mouse cursor off before the disk reads 
and then turned the mouse cursor on after the disk reads/writes and this 
seems to stop the crashes (MouseEraseCursor, MouseDisplayCursor).  This 
seems to make the program work, but I do not necessarily understand why.

I have read the User's Manual for LIBGRX but still do not exactly 
understand the mouse event handling.  Before going through a lot of 
LIBGRX and SUIT source code trying to understand this problem, I thought 
that I would post this problem here and see if someone has had a similar 
problem or if someone could provide a explanation for this mouse/disk 
behaviour.

Any help in this matter would be greatly appreciated.

Keith A. Heasley - heasleka AT ptbma DOT usbm DOT gov - (412) 892-6524