Re: [asyn] link already open!

[Pavel Maslov <pavel.masloff@gmail.com>]

Hi Mark!

The error occurs at iocInit (since my PVs have PINI=YES) and each time I read/write via CA.

The server is a Java Device Simulator at localhost:7001. It is always running and it never disconnects. All of my PVs are marked Invalid. In fact they have not been initialized.

I have tried with noAutoConnect=1 and this is what i get:

epics> 2013/08/09 15:48:06.034504 CAS-client lambda-ps:PWR_OUTPUT:RBV lockRequest: pasynManager->queueRequest() failed: port lambda1 not connected

epics> asynReport 2

lambda1 multiDevice:No canBlock:Yes autoConnect:No

    enabled:Yes connected:Yes numberConnects 1

    nDevices 0 nQueued 0 blocked:No

    asynManagerLock:No synchronousLock:No

    exceptionActive:No exceptionUsers 2 exceptionNotifys 0

    interposeInterfaceList

        asynOctet pinterface 0x7fdceea29800 drvPvt 0x1c6f820

    interfaceList

        asynCommon pinterface 0x7fdceea26c60 drvPvt 0x1c6c270

        asynOctet pinterface 0x1c6c2f8 drvPvt 0x1c6c270

    Port 127.0.0.1:7001: Connected

                    fd: 9

    Characters written: 0

       Characters read: 0

-- 
Regards,


Pavel Maslov, MS

On Fri, Aug 9, 2013 at 3:16 PM, Mark Rivers <rivers@cars.uchicago.edu> wrote:

Please provide some more information:

- When does the error occur?  At iocInit when connecting to the device for the first time?  When the server first comes on line?  When the server is restarted?

- The server is at port 7001 on the localhost.  Is that server always running when the IOC is running?  Does the server disconnect after each transaction?

You have created the drvAsynIPPort with the default value of 0 for the last 3 parameters, so it is using noAutoConnect=0, which means that asynManager will automatically try to connect the port before queuing a request.  If the connection attempt fails then asynManager will not queue the request.  So I am having a hard time understanding how StreamDevice found the port disconnected, unless your server disconnected in the time between when asynManager queued the request and when StreamDevice was called.

Mark


________________________________
From: tech-talk-bounces@aps.anl.gov [tech-talk-bounces@aps.anl.gov] on behalf of Pavel Maslov [pavel.masloff@gmail.com]
Sent: Friday, August 09, 2013 4:20 AM
To: EPICS Tech Talk
Subject: [asyn] link already open!

Hello all,

When can this message pop up:

2013/08/09 11:03:11.051131 lambda1 lambda-ps:CURR:MAX:RBV: pasynCommon->connect() failed: 127.0.0.1:7001<http://127.0.0.1:7001>: Link already open!

2013/08/09 11:03:11.052968 lambda1 lambda-ps:CURR:MAX:RBV: Protocol aborted



--
Regards,


Pavel Maslov, MS
Controls Engineer