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<== Date ==> <== Thread ==>
Subject: Question about "indirect processing" mentioned in documentation for the SSEQ
From: "Wang, Andrew via Tech-talk" <tech-talk at aps.anl.gov>
To: EPICS tech-talk <tech-talk at aps.anl.gov>
Date: Sat, 6 Aug 2022 05:59:35 +0000
Hi all,

I have a quick question regarding this one sentence about WAIT in the SSEQ documentation. It states:

"Finally, if the sseq record successfully waits for targetRecord to finish processing, it is still possible for other records to process as an indirect result of LNKn, and the sseq record cannot wait for this indirectly caused processing to finish unless the database developer has arranged for the indirectly caused processing to be traceable by EPICS."

Two questions I have.
  1. Suppose LNKn processes a record called "rec_1" through CA, "rec_1" is forward-linked to "rec_2", and "rec_2" is forward-linked to "rec_3". Does the statement about indirect processing apply in the case of "rec_1", "rec_2", and "rec_3" all being synchronous records when WAITn is set to be "Wait".
  2. Using the same example, except with "rec_1", "rec_2", and "rec_3" all being asynchronous records (StreamDevice), would indirect processing apply to this case when WAITn is set to be "Wait"? For instance, would SSEQ just wait for "rec_1"'s completion routine or "rec_3"'s completion routine?  

Thank you very much,
Andy
Replies:
Re: Question about "indirect processing" mentioned in documentation for the SSEQ Mooney, Tim M. via Tech-talk
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