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<== Date ==> <== Thread ==>

Subject: Re: asynDriver / epicsTimer bug
From: Dirk Zimoch <dirk.zimoch@psi.ch>
To: Eric Norum <norume@aps.anl.gov>
Cc: TECHTALK Tech-Talk <tech-talk@aps.anl.gov>
Date: Wed, 31 May 2006 14:43:05 +0200
Eric Norum wrote:


Hmm....
This sounds like a task starvation issue. It appears that the read task is looping at a higher priority than the event timer callback task and so is preventing the callback from running. My suspicion is that it's the vxWorks version of select() which is not rounding the timeout up to at least one tick. If so, the problem will still be present in the latest version of ASYN.

I called spy and found that the asyn port thread is indeed using up all CPU time at higher priority than e.g. CA or the timerQueues.



-- Dr. Dirk Zimoch Swiss Light Source Paul Scherrer Institut Computing and Controls phone +41 56 310 5182 fax +41 56 310 4413

Replies:
Re: asynDriver / epicsTimer bug Eric Norum
References:
asynDriver / epicsTimer bug Dirk Zimoch
Re: asynDriver / epicsTimer bug Dirk Zimoch
Re: asynDriver / epicsTimer bug Eric Norum

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