jdp@caleb.UUCP (Jim Pritchett) (03/02/90)
[ Munch a bunch of Fritos (tm) - instead of this line.]
Is there some sort of task switch interrupt chain? I'm probably not
describing this correctly. What I would like to do is to somehow have
my C code called each time that the Amiga switches tasks. (I want to
check some things and identify which task just swapped out.) Is this
doable? Is it too difficult? Any suggestions?
Thanks,
--
Jim Pritchett
UUCP: {attctc|texbell}!letni!dms3b1!caleb!jdp
or texbell!rwsys!caleb!jdpvalentin@cbmvax.commodore.com (Valentin Pepelea) (03/04/90)
In article <7779.AA7779@caleb> jdp@caleb.UUCP (Jim Pritchett) writes: > >Is there some sort of task switch interrupt chain? I'm probably not >describing this correctly. What I would like to do is to somehow have >my C code called each time that the Amiga switches tasks. (I want to >check some things and identify which task just swapped out.) Is this >doable? Is it too difficult? Any suggestions? Well, the only approved way doing something similar is using the (*tc_Switch)() and (*tc_Launch)() fields of a task control block. These fields point to functions which are to be called when that particular task loses or regains control. In order to trap every single arbitrary task switch, you'd have to SetFunction() the Switch() function, but even that would not trap interrupt context switches. (interrupts run as separate "micro-tasks" - Bryce's term) Needless to say, this is totally unsupported and is likely to lead to truble with future versions of the operating system. Now, what do you mean by "...and identify which task just swapped out." Are you trying to implement virtual memory? I would find that very interesting. Valentin -- The Goddess of democracy? "The tyrants Name: Valentin Pepelea may distroy a statue, but they cannot Phone: (215) 431-9327 kill a god." UseNet: cbmvax!valentin@uunet.uu.net - Ancient Chinese Proverb Claimer: I not Commodore spokesman be