Experimental Physics and
Industrial Control System

Andrew Johnson via Core-talk <core-talk at aps.anl.gov> · Sat, 06 Feb 2021 00:05:15 -0000

Towards the end of my tl;dr comment #18 above I wrote:

The solution to this probably has to involve reading the monotonic clock
and calling semTake(id, 1) again if the OS returned before the hi-res
delay has expired (we might have to do that twice).

So far I don't believe anybody has tried actually coding that fairly
obvious solution for any of the OSs where this problem exists.

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https://bugs.launchpad.net/bugs/1861612

Title:
  callbackRequestDelay not waiting for 1/60 sec on vxWorks

Status in EPICS Base:
  Triaged

Bug description:
  The problem is documented in this tech-talk thread:
  https://epics.anl.gov/tech-talk/2020/msg00308.php

  In 7.0.3.1, but not in 7.0.3, callbackRequestDelay(1/60) results in
  100% CPU time, most of the time in cbHigh.

  This happens on vxWorks 6.9.4.1 and was first seen with the scaler
  record with multiple types of scaler hardware and device support.

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System