Experimental Physics and Industrial Control System
On Tuesday, November 26, 2002, at 02:25 PM, Marty Kraimer wrote:
At the EPICS meeting last week Till asked:
1) Could we declare a maximum priority for any component of base?
2) Why does iocsh run at epicsThreadPriorityMax?
Brief discussion.
1) sounds like a good request. How about
epicsThreadPriorityBaseMax = 91
2) I will assume that this was done to be like vxWorks, which runs the
vxWorks shell at highest priority. If iocsh runs at
epicsThreadPriorityBaseMax it seems like it should be OK. If a very
high prority application thread uses all the CPU time iocsh can't get
control but this is the applications problem.
(2) -- I think we did this to ensure that you could still get some
response at the console even if some other task went insane and started
gobbling CPU cycles. With a strict priority-based scheduler like RTEMS
and vxWorks you'd have no possiblity of dealing with such tasks if the
shell were at a lesser or equal priority.
--
Eric Norum <[email protected]>
Department of Electrical Engineering
University of Saskatchewan
Saskatoon, Canada.
Phone: (306) 966-5394 FAX: (306) 966-5407
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