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| MQOP_START donot work but MQOP_START_WAIT do |
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| yasaboy |
 Posted: Sun Jul 27, 2014 9:54 pm Post subject: MQOP_START donot work but MQOP_START_WAIT do |
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Voyager
Joined: 23 Jun 2014
Posts: 90
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Hi,
| Code: |
MQCTL(Hcon,MQOP_START_WAIT,&ctlo,
&CompCode,&Reason); |
What is the differnce between MQOP_START_WAIT and MQOP_START in MQCTL.
When we try to implement a MQCB for a Queue, it only works when we use MQOP_START_WAIT. Without wait it simply exits the progrm without getting the messages from the callback queue. But shouldn't it be working for MQOP_START as given in the examples? please help  |
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| PaulClarke |
| Posted: Mon Jul 28, 2014 1:01 am Post subject: |
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Grand Master
Joined: 17 Nov 2005
Posts: 1002
Location: New Zealand
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The difference is clearly described in the manual. MQOP_START_WAIT effectively donates the current thread to the async. consumer. So, messages are delivered to the callback functions on the same thread as issues the MQCTL call. So, essentially the MQCTL call blocks until you suspend or stop consumption.
The MQOP_START call returns immediately and callback functions are calls on different threads that are managed by MQ. Since the MQCTL call returns immediately you need to do something with that thread. Usually you are in a message loop, or waiting for some user input, or perhaps even waiting on an MQ message in an MQGET. What you don't want to do of course is issue the MQCTL call and then let that main thread continue and end the application.
Hope this helps,
Paul.
_________________
Paul Clarke
MQGem Software
www.mqgem.com |
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| yasaboy |
| Posted: Mon Jul 28, 2014 8:57 pm Post subject: |
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Voyager
Joined: 23 Jun 2014
Posts: 90
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@PaulClarke Thanks fop the  Mate |
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