| Author |
Message
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| Bahan |
 Posted: Fri Apr 06, 2007 4:50 am Post subject: [MQSeries v5.3] Error 2042 - Objetc in use |
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Apprentice
Joined: 16 Jul 2006
Posts: 47
Location: France
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Hi, i'm currently using MQseries 5.3 on an AIX 4.3 system and in my C program, I noticed some strange error code which appears sometimes : 2042.
Does that mean that when someone is opening the queue to put a message in it, someone else cannot open the queue to get messages ?
Is it the way it works ?
Thanks for your answers.
Bahan
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| jefflowrey |
| Posted: Fri Apr 06, 2007 7:01 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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It depends on what options are specified when someone opens it.
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| Vitor |
| Posted: Mon Apr 09, 2007 8:30 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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This of course includes how you open the queue.
The Application Programming Guide will (perhaps obviously) guide you in this. 
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| Bahan |
| Posted: Mon Apr 09, 2007 11:52 pm Post subject: |
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Apprentice
Joined: 16 Jul 2006
Posts: 47
Location: France
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It is in C language.
Here is the code to open the queue :
| Code: |
/*
* -- ---------------------------------------------------------
* Opening queue
* -- ---------------------------------------------------------
*/
mqOptionOpen = MQOO_INPUT_EXCLUSIVE | MQOO_FAIL_IF_QUIESCING;
strcpy(stDescObj.ObjectName, szQueue);
strcpy(stDescObj.ObjectQMgrName, szQueueManager);
MQOPEN(mqConnection, &stDescObj, mqOptionOpen, &mqObj, &mqCrOpening, &mqErrorCode);
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Do you think my "problem" comes from the variables mqOptionOpen ?
| Quote: |
| The Application Programming Guide will (perhaps obviously) guide you in this. |
Hum, do you know where I can find it ?
Thanks.
Bahan
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| Vitor |
| Posted: Tue Apr 10, 2007 12:06 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| Bahan wrote: |
Do you think my "problem" comes from the variables mqOptionOpen ?
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I think if you want 2 applications to open the same queue at the same time, specifying exclusive access as an option will not be helping.... 
| Bahan wrote: |
| Quote: |
| The Application Programming Guide will (perhaps obviously) guide you in this. |
Hum, do you know where I can find it ?
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I find it amazing that you can look through this forum and manage to avoid seeing both the documentation button at the top of this page & this link peppered through it:
http://publib.boulder.ibm.com/infocenter/wmqv6/v6r0/index.jsp
But then, I always find it amazing. Maybe I'm easily amazed. You're certainly not the first person to miss it. In fact, not the thousanth I suspect. Maybe it's me.... 
There are also PDF versions of the manuals on the IBM site if you prefer them.
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| Bahan |
| Posted: Tue Apr 10, 2007 3:07 am Post subject: |
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Apprentice
Joined: 16 Jul 2006
Posts: 47
Location: France
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Sorry about that 
It is my mistake.
Bahan
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| Vitor |
| Posted: Tue Apr 10, 2007 3:10 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| Bahan wrote: |
Sorry about that
It is my mistake.
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All mistakes are steps on the path of learning.
(Unless of course it's a major blunder in a live production system! That's harder to pass off as a learning experience... )
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| Bahan |
| Posted: Tue Apr 17, 2007 8:20 am Post subject: |
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Apprentice
Joined: 16 Jul 2006
Posts: 47
Location: France
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Hum, I have another question about MQOO_INPUT_SHARED.
| Quote: |
MQOO_INPUT_SHARED
public final static int
Open the queue to get messages with shared access. The queue is opened for use with subsequent MQGET calls. The call can succeed if the queue is currently open by this or another application with MQOO_INPUT_SHARED, but fails with reason code MQRC_OBJECT_IN_USE if the queue is currently open with MQOO_INPUT_EXCLUSIVE. |
But in this description, it doesn't describe the following case : What happen if I open the queue while it is already opened by someone else. I mean, will I get the full messages put in it ? Or is it a risk that I get only a part of a message ?
Bahan
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| jefflowrey |
| Posted: Tue Apr 17, 2007 8:23 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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If two applications have a queue open, both with INPUT_SHARED, then it is not specified(in the general case) which application will receive a given message.
However, it is never the case that an MQ application will receive anything less than a complete MQ message.
To be more specific about that first point, given two GETS that have the same criteria, it is not specified which one will receive a particular message that matches that criteria. However, one and only one of those GETs will receive the message and it will always receive the full message.
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| Bahan |
| Posted: Tue Apr 17, 2007 11:46 pm Post subject: |
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Apprentice
Joined: 16 Jul 2006
Posts: 47
Location: France
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Thanks for your answer.
In fact, in my case, I have two applications which open the queue at the same time, but the first one will only put messages into it and the other one will only gets the messages.
Thanks again.
Bahan
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