Experimental Physics and
Industrial Control System

"Hu, Yong via Tech-talk" <tech-talk at aps.anl.gov> · Tue, 24 Nov 2020 21:49:34 +0000

Michael,

I tested those records in 3.14.12, 3.15.6, and 7.0.4.1, the same result. Although I set the reprocessing field RPRO to 1, the asynchronous calcout record is not reprocessed after the asynchronous delay is completed.

I enabled the field "TPRO" and I added a few debugging messages in the EPICS base, trying to figure out how the link option CP works. The call chain seems to be like this: whenever the value of "PMStatus-I" changes, dbCa.c/eventCallback() is called, then dbScan.c/scanOnce() is called; scanOnce gives out "onceSem" which is received by oneTask(); oneTask() calls dbAccess.c/dbProcess() which eventually calls the record support routine "process" if the record's PACT is not TRUE.    

The comment " /* If already active dont process */" and the codes in the function dbAccess.c/dbProcess() explain the results of the asynchronous caclout record: during the delay period, when a monitor occurs (it is INPA in my case), it indeed requests the calcout record be processed, but dbProcess() does not fulfill the request because the calcout's PACT is TRUE.   

------------------------------------------------------------------------
record(bi, "PMStatus-I") {
    field(DESC,"Post-Mortem status")
    field(ZNAM,"PM Ready")
    field(ONAM,"PM Detected")
}
record(calcout,"PM-Calc_") {
    field(INPA,"PMStatus-I CP")
    field(CALC,"A")
    field(OOPT,"Transition To Non-zero")
    field(OUT, "PM-Cmd PP")
    field(ODLY, "15")
    field(RPRO,"1")
    field(MDEL,"-1")
}
record(bo, "PM-Cmd") {
    #field(DTYP,"Launcher")
    #field(OUT, "@python /epics/iocs/postmortem/save_pmdata.py")
    field(ZNAM,"Idle")
    field(ONAM,"Setting")
    field(HIGH,"1")
}
------------------------------------------------------------------------
The original thread: https://epics.anl.gov/tech-talk/2020/msg02102.php 

On 11/21/20, 10:54 AM, "Michael Davidsaver" <mdavidsaver at gmail.com> wrote:

    What version of Base is involved?

    I did some work related to queuing of processing when an asynchronous
    record appears in the middle of a chain, which is applicable to your database.
    This appeared in 7.0.2.1.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System