Experimental Physics and
Industrial Control System

"Mark Rivers" <[email protected]> · Thu, 30 Oct 2003 23:54:19 -0600

Folks,

I am getting the following error when processing an EPICS "seq" record with CA links:

dbCaLink: A call to "assert ((epicsMutexLock((pca->lock))==epicsMutexLockOK))" failed in ..../dbCa.c at 757
Current time THU OCT 30 2003 18:48:42.968775352.
EPICS Release EPICS R3.14.4 $R3-14-4$ $2003/09/23 21:35:11$.
Please E-mail this message and the output from "tt (0x1558050)"
to the author or to [email protected]
filename="../../../src/libCom/taskwd/taskwd.c" line number=170
task 0x1558050 suspended

Here is the output of "tt":
ioc13lab> tt (0x1558050)
19e530 vxTaskEntry    +60 : 1a70bcc ()
1a70c1c epicsThreadPrivateGet+cc : dbCaTask ()
19ff9e0 dbCaTask       +2d4: epicsAssert ()
1a6f9dc epicsAssert    +f0 : epicsThreadSuspendSelf ()
1a70644 epicsThreadSuspendSelf+14 : taskSuspend ()
value = 0 = 0x0

The problem happens when the following record is processed:
grecord(seq,"$(P)AbortScansSEQ") {
        field(LNK1,"$(P)scanH.EXSC  CA MS")
        field(LNK2,"$(P)scan1.EXSC  CA MS")
        field(LNK3,"$(P)scan2.EXSC  CA MS")
        field(LNK4,"$(P)scan3.EXSC  CA MS")
        field(LNK5,"$(P)scan4.EXSC  CA MS")
}

This record is just writing 0 to the "EXSC" field of 5 "sscan" records using CA links.  The problem does not appear to be in the sscan record itself, because I can write to the .EXSC fields using CA from a client, or using "dbpf" from the vxWorks prompt, and it works fine.

Changing this record to:
grecord(seq,"$(P)AbortScansSEQ") {
        field(LNK1,"$(P)scanH.EXSC  PP MS")
        field(LNK2,"$(P)scan1.EXSC  PP MS")
        field(LNK3,"$(P)scan2.EXSC  PP MS")
        field(LNK4,"$(P)scan3.EXSC  PP MS")
        field(LNK5,"$(P)scan4.EXSC  PP MS")
}
i.e. using database links rather than CA links "fixes" the problem, and there are no errors.

I've attempted to reproduce the problem in a simple example application and have not been able to do so yet.

Any ideas what the problem could be?

Thanks,
Mark

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System