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Subject: Re: AsynPortDriver separate thread causes Segmentation fault with "dbGetLinkValue" error message
From: Michael Davidsaver via Tech-talk <tech-talk at aps.anl.gov>
To: Mark Rivers <rivers at cars.uchicago.edu>, 'Abdalla Ahmad' <Abdalla.Ahmad at sesame.org.jo>, "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Date: Tue, 3 Nov 2020 09:18:38 -0800
On 11/3/20 8:49 AM, Mark Rivers via Tech-talk wrote:
> -          I don’t think EPICS supports variable length waveform records.  You need to create the waveform record in dbLoadRecords with a size that is the largest you plan to use.  That is what areaDetector does with NDPluginStdArrays.

To clarify, waveform records have a _maximum_ size which is fixed
on initialization (eg. NELM).  Actually size (NORD) has long been
changeable at runtime in the range [0, NELM].

Some caveats about NORD==0 apply wrt. CA specifically (works fine with PVA).

Replies:
Re: AsynPortDriver separate thread causes Segmentation fault with "dbGetLinkValue" error message Abdalla Ahmad via Tech-talk
References:
AsynPortDriver separate thread causes Segmentation fault with "dbGetLinkValue" error message Abdalla Ahmad via Tech-talk
RE: AsynPortDriver separate thread causes Segmentation fault with "dbGetLinkValue" error message Mark Rivers via Tech-talk

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