Concurrent d.rast

Conn Copas cvc at
Tue Jul 5 04:52:27 EDT 1994

I have a problem trying to display graphics to several monitors simultaneously.
What I have done is started a number of monitors, and then written a script
which contains instructions like:

	d.mon select=x0
	d.rast <map1>&
	d.mon select=x1
	d.rast <map2>&

Each 'd.rast' command spawns a separate process, but these seem to interfere
with each other, with the result that some monitors wind up blank. Questions:
(a) Am I trying to do something which the X driver does not support? I have
noticed that most demo scripts write to graphics monitors in a sequential
fashion (still on release 4.0, btw)
(b) What happens if different users, on different X terminals, all try to
display at once - do they receive concurrent or sequential service?

Conn V Copas
Information Technology Division
Defence Science and Technology Organisation
PO Box 1500
Salisbury            tel: +61 (0)8 25 95349
SA  5108             fax: +61 (0)8 25 96781
Australia       e-mail: cvc at

More information about the grass-dev mailing list