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

Subject: Re: Race condition during IOC startup?
From: Ralph Lange <[email protected]>
Cc: EPICS Tech-Talk <[email protected]>
Date: Fri, 22 Feb 2013 23:07:32 +0100
On 22.02.2013 23:00, Zhang, Dehong wrote:
> Hi,
>
> I seem to have such a problem: when my IOC starts up, some of my records
> want to callback almost immediately.  Then my IOC crashes, because the "onceQ"
> related stuff are not created yet -- is this possible?

What is causing these callbacks?
On a well-behaved IOC, the possible sources for callbacks are enabled
last, after the scan and database mechanisms are up.

> Is it safe to move the "scanInit" call in iocBuild to just before "initDrvSup"
> (EPICS base 3.14.12, src/misc/iocInit.c)?

I would not change such internals without a very good and
well-understood reason.
This sounds like applying a dirty patch to remove a symptom, instead of
searching for the cause.

~Ralph


References:
Race condition during IOC startup? Zhang, Dehong

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