Date: Wed, 19 May 1999 01:20:01 +0930 From: Matthew Thyer <thyerm@camtech.com.au> To: Bruce Evans <bde@zeta.org.au> Cc: current@FreeBSD.ORG, dawes@rf900.physics.usyd.edu.au, green@unixhelp.org, jkh@zippy.cdrom.com Subject: XFree86 xsetpointer causes silo overflows (Was: Re: Fixed my MAMEd sio problem.) Message-ID: <37418C29.DEECA1AC@camtech.com.au> References: <199905170127.LAA04147@godzilla.zeta.org.au>
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I have confirmed that the problem occurs if I just do: xsetpointer Joystick sleep 1 xsetpointer pointer So M.A.M.E. is unrelated to the problem as Bruce Evans would suggest. So the problem appears to be with XFree86 not closing the joystick device after I've used it as a pointer with 'xsetpointer'. I am sure I am using xsetpointer correctly as I can use my PC joystick as a pointing device (once I calibrate it). I was just using xsetpointer with an incorrectly calibrated joystick so it moved the pointer to the top left corner of the screen in my xmame.sh shell script (I'd like to know how to do this another way). Bruce Evans wrote: > > >Just so you all know (the list included) how I have fixed my silo > >overflow problem which occurred while running xmame (and after I quit > >until I restarted the X server).... > > > >I have found the problem doesn't occur if I remove the following lines > >from the shell script I use to start xmame: > > > >xsetpointer Joystick > >sleep 1 > >xsetpointer pointer > > FreeBSD's joystick driver certainly causes silo overflows. It disables > CPU interrupts and polls for 2 msec. For 16550 serial hardware, this may > cause loss of 21 characters at 115200 bps (23 characters arriving in > 2 msec less 2 characters of buffering provided by the 16550 fifo above > the trigger level). If sio used a more conservative trigger level of 8, > then then the loss would be limited to only 15 characters. > > >With those lines in the script I had to restart the X-server after > >using xmame or I'd get continuous silo overflows. > > Closing the joystick device should also work. > > The joystick driver shouldn't disable CPU interrupts or mask clock > interrupts. > > Bruce -- /=======================================================================\ | Work: Matthew.Thyer@dsto.defence.gov.au | Home: thyerm@camtech.net.au | \=======================================================================/ "If it is true that our Universe has a zero net value for all conserved quantities, then it may simply be a fluctuation of the vacuum of some larger space in which our Universe is imbedded. In answer to the question of why it happened, I offer the modest proposal that our Universe is simply one of those things which happen from time to time." E. P. Tryon from "Nature" Vol.246 Dec.14, 1973 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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