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| file descriptor and select() for MQ |
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| skytorch |
 Posted: Tue Jul 23, 2002 10:06 am Post subject: file descriptor and select() for MQ |
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Apprentice
Joined: 10 Jun 2002
Posts: 47
Location: New York City
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Hi,
We've a MQ Client in C that use MQ5.2 QM on solaris 7. This client is a single threaded to read from a socket connection and a app queue Q1.
If a message comes from the socket, it'll send message to some app queues; if a message comes to Q1, it'll send it to the socket connection.
Since the application is single threaded, in order to improve the system performance, both reads from socket and Q1 should better be in non-block manner.
I wonder if I can use unix select(<file descriptors>) to monitor both socket connection and a Q1 within one thread. If a message shows up in either one, I can process it.
Is it do-able with MQ Queue ?
Thanks.
Sky |
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| kolban |
| Posted: Tue Jul 23, 2002 11:13 am Post subject: |
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Grand Master
Joined: 22 May 2001
Posts: 1072
Location: Fort Worth, TX, USA
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Unfortunately not. If you could allow yourself to be multi-threaded, you could have a thread that blocks on the socket and a thread that blocks on the queue with an MQGET call. Unfortunately, there is no asynchronous delivery mechanism to notify you that a message is available when you do an MQGET call.
You could do a blocking MQGET call with a small delay (say 1000 ms or less) and, if awoken because there was no message, then do a block on the socket for a 1000 ms and repeat.
This would be a loose kind of polling but not so inefficient that the resources consumed would be too high.
You could also go multi-process if multi-threading isn't possible. Have a second, demon program, block indefinietly on the queue and, when a message is available, consume the message and then send it down a socket to be consumed by the blocked main thread/process. |
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