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Subject: Vanishing OUTLINKS
From: Peregrine McGehee <mcgehee@cfht.hawaii.edu>
To: tech-talk@aps.anl.gov
Date: Fri, 21 Jun 1996 09:02:52 -1000
Aloha,

Under EPICS R3.12 (specifically Version R3.12.0Beta13) I find the
following behavior:

Given two records A and B in the same lockset with A.OUT = "B .PP .NMS".
If record B is separately processed by hand and later record A is
processed B is (surprise!) no longer processed as a result of A's
OUTLINK even though B is still in the same lockset as A.

As an example: 
	cp:if:mcs:dir.OUT = "DB_LINK pp=1 ms=0 mcs:cmd:move.DIR"

# enable trace messages
-> dbpf "cp:if:mcs:dir.TPRO", "1"
-> dbpf "mcs:cmd:move.TPRO", "1"

# get locksets
-> dbgf "cp:if:mcs:dir.LSET"
DBR_SHORT:          1         0x1
-> dbgf "mcs:cmd:move.LSET"
DBR_SHORT:          1         0x1

# force A to process
-> dbpf "cp:if:mcs:dir.PROC", "1"
process:   cp:if:mcs:dir
process:   mcs:cmd:move

# force B to process
-> dbpf "mcs:cmd:move.PROC", "1"
process:   mcs:cmd:move
# check B's lockset
-> dbgf "mcs:cmd:move.LSET"
DBR_SHORT:          1         0x1

# force A to process again
-> dbpf "cp:if:mcs:dir.PROC", "1"
process:   cp:if:mcs:dir
->

Even though the two records are still in the same lockset and A's
OUTLINK still points to B, the link no longer operates!


This construct is being used to switch subsystems in and out of
Standalone modes. A possible workaround is to add two new records C
and D such that:
	A.OUT = "C .PP .NMS"

	C.FLNK = "D"
	D.DOL = "C"
	D.OMSL = "supervisory" in standalone mode, "closed_loop" otherwise.

	D.OUT = "B .PP .NMS"


I can't use an FLNK from A since A and B may be on separate IOCs.

Peregrine

-------------------------------------------------------------------------------
Peregrine M. McGehee			http://www.cfht.hawaii.edu/~mcgehee
Telescope Control Systems Group 	Canada-France-Hawaii Telescope
(808) 885-3178				P.O. Box 1597, Kamuela, Hawaii 96743	


Replies:
Re: Vanishing OUTLINKS Marty Kraimer

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