[Bug 1841634] Re: CP link triggers lost when record is async

[mdavidsaver via Core-talk <core-talk at aps.anl.gov>]

See https://urldefense.us/v3/__https://github.com/epics-base/epics-base/issues/557__;!!G_uCfscf7eWS!cG3hlH-ojnbAZ0H3wCnInGNeQPXJzYjecXCPDgtDF2zvomzx1jDU1hKPWGZp0NhJEjj6kyVWq-6IbaN2jBFR_CyPDR-i$ 

** Bug watch added: github.com/epics-base/epics-base/issues #557
   https://urldefense.us/v3/__https://github.com/epics-base/epics-base/issues/557__;!!G_uCfscf7eWS!cG3hlH-ojnbAZ0H3wCnInGNeQPXJzYjecXCPDgtDF2zvomzx1jDU1hKPWGZp0NhJEjj6kyVWq-6IbaN2jBFR_CyPDR-i$ 

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Title:
  CP link triggers lost when record is async

Status in EPICS Base:
  Confirmed
Status in EPICS Base 7.0 series:
  Confirmed

Bug description:
  From Benjamin Franksen:

  Here is a small self-contained database to reproduce this:

  record(calcout,"input") {
      field(CALC,"A<4?A+1:A")
      field(INPA,"input")
      field(ODLY,"1")
      field(OUT,"input.A CA")
  }
  record(calcout,"output") {
      field(ODLY,"1.5")
      field(INPA,"input CPP")
      field(CALC,"A")
      field(TPRO,1)
  }
  record(calc,"check") {
      field(INPA,"input CPP")
      field(INPB,"output CPP")
      field(CALC,"A==B")
  }

  Processing "input" (caput input.PROC 1) starts the test. The "check"
  record should eventually settle to 1 (but doesn't).

  With 7.0.3 I get this output:

  scanOnce: dbProcess of 'output' # initial CPP processing
  scanOnce: dbProcess of 'output'
  scanOnce: dbProcess of Active 'output' with RPRO=0
  scanOnce: dbProcess of 'output'
  scanOnce: dbProcess of Active 'output' with RPRO=0

  Note how this says "with RPRO=0".

  And camonitor says:

  franksen@tiber: ~ > camonitor input output check
  input                          <undefined> 0 UDF INVALID
  output                         2019-08-27 16:02:16.106413 0
  check                          2019-08-27 16:02:16.106617 1
  input                          2019-08-27 16:02:26.498483 1
  check                          2019-08-27 16:02:26.498721 0
  input                          2019-08-27 16:02:27.493734 2
  output                         2019-08-27 16:02:27.993908 1
  input                          2019-08-27 16:02:28.489068 3
  input                          2019-08-27 16:02:29.484350 4
  output                         2019-08-27 16:02:29.984458 3

  I think the difference in behavior between processing due to a CPP
  input link versus processing due to a PP or CA output link is quite
  surprising.

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