Experimental Physics and
Industrial Control System

Hello Klemen,

thank you for your reply.

Your solution looks quite interesting.

Did you get feedback whether these changes are to be added to the EPICS
base ?

If this is the case one could at implement at least some of the
functions for
vxWorks and RTEMS too.

Greetings

  Goetz


On 02/21/2012 11:23 AM, Klemen Zagar wrote:

Dear Goetz.

we have run into a problem with epicsThreadCreate: under vxWorks we
cannot create a new thread with the priority we need. With the
current implementation it's impossible.

ITER had a similar problem (apart from priority, also CPU affinity
needed to be set), which we solved in ~September last year with a
patch. However, since ITER is Linux-based, the patch is for the POSIX
API. I don't think it should be too difficult to extend to support
vxWorks.

Here is the post on the tech-talk mailing list:

  http://www.aps.anl.gov/epics/tech-talk/2011/msg01602.php

(The links to patch and the report in that post still work.)

At that time, we also discovered (through code review) issues with
mapping of EPICS priority levels to POSIX ones.

One advantage of that patch I see is that it doesn't break
backward-compatibility or introduce new API -- just IOC shell
functions through which you can tune the priorities from the startup
script.

Best regards,
  Klemen.

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