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Update RELEASE_NOTES for timestamp-before-outlink

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Bruce Hill
2020-10-07 06:25:27 -07:00
parent f1e83b22f2
commit f44f4ac7ad
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documentation/RELEASE_NOTES.md
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@@ -17,6 +17,20 @@ should also be read to understand what has changed since earlier releases.
<!-- Insert new items immediately below here ... -->
### Timestamp before processing output links
The record processing code for records with output links has been modified
to update the timestamp via recGblGetTimeStamp() before processing the
output links. This ensures that other records which get processed via
the output link can use TSEL links to fetch the timestamp which corresponds
to the data processed by the output link.
This change could result in a slightly earlier timestamp for records whose
output link is handled by a device driver, but only if the device driver does
not handle its own timestamping via TSE -2 and instead uses TSE 0 or TSE -1
to get current time or best time, and the time spent in the device driver is
greater than your timestamp provider resolution. For these situations it is
recommended to set TSE to -2 and set the timestamp in the driver code.
### Add registerAllRecordDeviceDrivers()
Addition of registerAllRecordDeviceDrivers() as an iocsh function