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<== Date ==> <== Thread ==>

Subject: RE: ASYN Octet driver question
From: "David Dudley" <[email protected]>
To: <[email protected]>
Date: Thu, 29 Mar 2007 08:18:12 -0500
This is a serial modbus driver.  It supports AI, AAI, AO, AAO, BI, BO,
MBBI, MBBO, StringIn, and StringOut.  I'm going to add Waveform support
to it as well.  Right now, I seem to have an intermittent problem where
it will just start timeing out messages after a while, and I get quite a
few communications failures that I don't think I should have.  I think
it's a problem with the asyn thread communicating callbacks with the
database thread.

David Dudley

>>> "Mark Rivers" <[email protected]> 3/28/2007 9:06 PM >>>
David,
 
"... queueRequest Priority 1 not lockholder...", 
 
The messages you are seeing are normal, they do not indicate an error. 
I think we should change the messages so that they look less like
errors.
 
Here is the output of a serial device that is working normally, with
all asynTrace flags set to 1.
 
2007/03/28 19:54:24.184 serial1 addr -1 queueRequest priority 0 not
lockHolder
2007/03/28 19:54:24.184 serial1 schedule queueRequest timeout
2007/03/28 19:54:24.184 serial1 callback
2007/03/28 19:54:24.184 13BMA:ip1_serial: asynCallbackProcess, state=3
2007/03/28 19:54:24.217 serial1 flush2007/03/28 19:54:24.267 serial1
flush
2007/03/28 19:54:24.300 13BMA:ip1_serial flush
2007/03/28 19:54:24.350 serial1 write.
2007/03/28 19:54:24.384 serial1 write 3 RD\r
2007/03/28 19:54:24.434 serial1 write RD\r
2007/03/28 19:54:24.467 13BMA:ip1_serial: nwrite=2, status=0, nawt=2,
data=RD
2007/03/28 19:54:24.550 serial1 read.
2007/03/28 19:54:24.600 serial1 read 36 RD\023\n\r19 09:38 5400V
8.2E-5I H---23\n\r
2007/03/28 19:54:24.684 serial1 read RD\023\n\r19 09:38 5400V 8.2E-5I
H---23\n\r
2007/03/28 19:54:24.767 serial1 read.
2007/03/28 19:54:24.867 serial1 read 1 \021
2007/03/28 19:54:24.867 serial1 read \021
2007/03/28 19:54:24.900 13BMA:ip1_serial: inlen=40, status=0, ninp=37,
data=RD\023\n\r19 09:38 5400V 8.2E-5I H---23\n\r\021
2007/03/28 19:54:25.034 13BMA:ip1_serial: inlen=37,
nbytesTransfered=37, ntranslate=47 

By the  way, you said you are working on a Modbus driver.  Is this
serial, or  Modbus TCP?  I am just about to release a package for Modbus
TCP that uses asyn for the TCP I/O, and asyyn device support.  I hope to
release it by  thee end of the week.  I'l send a note to tech-talk when
its ready.
 
 
Mark
 
________________________________

From: David Dudley [mailto:[email protected]] 
Sent: Wed 3/28/2007 2:29 PM
To: [email protected] 
Subject: ASYN Octet driver question



I'm trying to solve a problem with the ASYN Octet package in my Modbus
driver.  When I have tracing turned on, I get exceptions every time I
try to write or read something, that say "... queueRequest Priority 1
not lockholder...", and then "...queueRequest timeout...".
However, the requests still get processed (most of the time....).

Trying to track down what this "...not lockholder..." message is from.
I look through my code, and I don't see anything where I'm calling the
"asynManager->registerPort" routine, nor do I see anything that
references it.  Would that cause this problem?

David Dudley



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