Re: opening multiple connections from C program on solaris
Try using MQCONNX and link your program with the client libraries. Example
MQCONNX related code follows.
MQCNO connectOpts = {MQCNO_DEFAULT};
MQCDclientDef = {MQCD_CLIENT_CONN_DEFAULT};
strncpy(clientDef.ConnectionName, connNameStr, MQ_CONN_NAME_LENGTH);
strncpy(clientDef.ChannelName, channelNameStr, MQ_CHANNEL_NAME_LENGTH);
connectOpts.ClientConnPtr = &clientDef;
connectOpts.Version = MQCNO_VERSION_2;
MQCONNX(qMgrNameStr,&connectOpts,&hConn,&compCode,&reasonCode);
Good luck.
Tim A
"Lakshmi, Saraswathi"
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SCLEAR.COM> cc:
Sent by: MQSeries ListSubject: opening multiple
connections from C program on solaris
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28/05/2003 18:15
Please respond to
MQSeries List
Hi,
Is it possible to set-up multiple MQ connections from a program in Solaris
env. I tired to set-up multiple connections, but the connection handle is
the same for all of them. Is it possible to get unique connection-handles
for each connection.
The reason for this requirement is that the program has to handle multiple
queues, and the application has to issue MQCMIT based on the data received
in the queues. The program is designed for a real-time asynchronous
communication. The application is up-running all the time and keeps
polling it other interfaces to check if data has arrived. Based n the data
received from other interfaces, it has to PUT the message into an MQ Queue
and commit it. It is also a single -threaded application.
mfg
lakshmi
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Archive: http://vm.akh-wien.ac.at/MQSeries.archive
Re: opening multiple connections from C program on solaris
Hi, THanks for your response. We are using MQ 5.2 on all our dev/test/production platforms. We can migrate to MQ 5.3 only when it has tested in our DEV. env. I have two choices now either to upgrade to MQ 5.3 or to make application multi/threaded. We are unable to install MQ 5.3 since our dev. is still under Solris 2.6 (for dependencies from other s/w residing on the server). Right now except for the MQ part - all other events in the program are driven by a Semaphore. For the MQ part - polling on MQGET is done. Looks like i have to do some re-design with mutli-threading, under the given circumstances. thanks and regards lakshmi > -Original Message- > From: Paul Clarke [SMTP:[EMAIL PROTECTED] > Sent: Wednesday, May 28, 2003 1:47 PM > To: [EMAIL PROTECTED] > Subject: Re: opening multiple connections from C program on solaris > > >Hi, > > >The reason for requiring multiple connections - is the application is > designed as a gateway to two other applicatins. Hence there >is a > possiblity of getting messages from either interfaces asynchronously. > further the async. processing is based on a dialog. >Unless the dialog is > complete, messages that are retreived or put cannot be commited. If there > is an error in completing the >dialog, then it should be rolled-back for > the particular message in question, rather than for all messges that have > been handled >on that connection (within a given time-interval), but the > status of other messages in other queues would be different ( because >the > dialog may not be complete ..because the application is waiting for a > response to arrive, while it is currently someother >message on a different > queue). Then we have a problem of data consistency. > > >rgds > >lakshmi > > lakshmi, > > I think I understand now, you have a dialog which retrieves a message from > the server under a transaction, this drives a dialog and when the dialog is > complete you want to send a response and commit the whole as a transaction. > This seems reasonable, however, if you are acting on behalf of multiple > dialogs and messages can arrive on the server at any time then I would have > throught you'd have to do this as a multithreaded application anyway. You > can't, sadly, wait on an MQGET and on, say, a semaphore at the same time. > Is there any particular reason why you want to restrict yourself to a > single thread ? > > Cheers, > P. > > Paul G Clarke > WebSphere MQ Development > IBM Hursley > > Instructions for managing your mailing list subscription are provided in > the Listserv General Users Guide available at http://www.lsoft.com > Archive: http://vm.akh-wien.ac.at/MQSeries.archive The content of this e-mail is intended only for the confidential use of the person addressed. If you have received this message in error, please notify us immediately by electronic mail, by telephone or by fax at the above num- bers. E-mail communications are not secure and therefore we do not accept any res- ponsibility for the confidentiality or altered contents of this message. Please be aware that SIS Group and its subsidiary companies cannot accept any orders or other legally binding correspondence with a participant as part of an E-mail. The views expressed above are not necessarily those held by SIS Group and its subsidiary companies and not binding for them. exfe Instructions for managing your mailing list subscription are provided in the Listserv General Users Guide available at http://www.lsoft.com Archive: http://vm.akh-wien.ac.at/MQSeries.archive
Re: opening multiple connections from C program on solaris
>Hi, >The reason for requiring multiple connections - is the application is designed as a gateway to two other applicatins. Hence there >is a possiblity of getting messages from either interfaces asynchronously. further the async. processing is based on a dialog. >Unless the dialog is complete, messages that are retreived or put cannot be commited. If there is an error in completing the >dialog, then it should be rolled-back for the particular message in question, rather than for all messges that have been handled >on that connection (within a given time-interval), but the status of other messages in other queues would be different ( because >the dialog may not be complete ..because the application is waiting for a response to arrive, while it is currently someother >message on a different queue). Then we have a problem of data consistency. >rgds >lakshmi lakshmi, I think I understand now, you have a dialog which retrieves a message from the server under a transaction, this drives a dialog and when the dialog is complete you want to send a response and commit the whole as a transaction. This seems reasonable, however, if you are acting on behalf of multiple dialogs and messages can arrive on the server at any time then I would have throught you'd have to do this as a multithreaded application anyway. You can't, sadly, wait on an MQGET and on, say, a semaphore at the same time. Is there any particular reason why you want to restrict yourself to a single thread ? Cheers, P. Paul G Clarke WebSphere MQ Development IBM Hursley Instructions for managing your mailing list subscription are provided in the Listserv General Users Guide available at http://www.lsoft.com Archive: http://vm.akh-wien.ac.at/MQSeries.archive
Re: opening multiple connections from C program on solaris
Hi, The reason for requiring multiple connections - is the application is designed as a gateway to two other applicatins. Hence there is a possiblity of getting messages from either interfaces asynchronously. further the async. processing is based on a dialog. Unless the dialog is complete, messages that are retreived or put cannot be commited. If there is an error in completing the dialog, then it should be rolled-back for the particular message in question, rather than for all messges that have been handled on that connection (within a given time-interval), but the status of other messages in other queues would be different ( because the dialog may not be complete ..because the application is waiting for a response to arrive, while it is currently someother message on a different queue). Then we have a problem of data consistency. rgds lakshmi > -Original Message- > From: Paul Clarke [SMTP:[EMAIL PROTECTED] > Sent: Wednesday, May 28, 2003 11:21 AM > To: [EMAIL PROTECTED] > Subject: Re: opening multiple connections from C program on solaris > > >Hi, > > >Is it possible to set-up multiple MQ connections from a program in Solaris > env. I tired to set-up multiple connections, but the >connection handle is > the same for all of them. Is it possible to get unique connection-handles > for each connection. > > >The reason for this requirement is that the program has to handle multiple > queues, and the application has to issue MQCMIT based >on the data received > in the queues. The program is designed for a real-time asynchronous > communication. The application is >up-running all the time and keeps > polling it other interfaces to check if data has arrived. Based n the data > received from other >interfaces, it has to PUT the message into an MQ Queue > and commit it. It is also a single -threaded application. > > > >mfg > >lakshmi > > Prior to 5.3 you could only have one connection to one Queue Manager in > each thread. Since your application is single threaded then you can only > have one connection. I would expect you to get back reason code > MQRC_ALREADY_CONNECTED on your subsequent attempts to connect. In 5.3 you > can ask for 'shared' connection when you issue MQCONNX. This connection can > be used across threads and you can issue MQCONN multiple times on the same > thread. > > What I don't quite understand is why, in a single threaded application that > seems to be issuing one MQPUT, you need to have multiple connections to the > Queue Manager anyway. > > Cheers, > P. > > Paul G Clarke > WebSphere MQ Development > IBM Hursley > > Instructions for managing your mailing list subscription are provided in > the Listserv General Users Guide available at http://www.lsoft.com > Archive: http://vm.akh-wien.ac.at/MQSeries.archive The content of this e-mail is intended only for the confidential use of the person addressed. If you have received this message in error, please notify us immediately by electronic mail, by telephone or by fax at the above num- bers. E-mail communications are not secure and therefore we do not accept any res- ponsibility for the confidentiality or altered contents of this message. Please be aware that SIS Group and its subsidiary companies cannot accept any orders or other legally binding correspondence with a participant as part of an E-mail. The views expressed above are not necessarily those held by SIS Group and its subsidiary companies and not binding for them. exfe Instructions for managing your mailing list subscription are provided in the Listserv General Users Guide available at http://www.lsoft.com Archive: http://vm.akh-wien.ac.at/MQSeries.archive
Re: opening multiple connections from C program on solaris
>Hi, >Is it possible to set-up multiple MQ connections from a program in Solaris env. I tired to set-up multiple connections, but the >connection handle is the same for all of them. Is it possible to get unique connection-handles for each connection. >The reason for this requirement is that the program has to handle multiple queues, and the application has to issue MQCMIT based >on the data received in the queues. The program is designed for a real-time asynchronous communication. The application is >up-running all the time and keeps polling it other interfaces to check if data has arrived. Based n the data received from other >interfaces, it has to PUT the message into an MQ Queue and commit it. It is also a single -threaded application. >mfg >lakshmi Prior to 5.3 you could only have one connection to one Queue Manager in each thread. Since your application is single threaded then you can only have one connection. I would expect you to get back reason code MQRC_ALREADY_CONNECTED on your subsequent attempts to connect. In 5.3 you can ask for 'shared' connection when you issue MQCONNX. This connection can be used across threads and you can issue MQCONN multiple times on the same thread. What I don't quite understand is why, in a single threaded application that seems to be issuing one MQPUT, you need to have multiple connections to the Queue Manager anyway. Cheers, P. Paul G Clarke WebSphere MQ Development IBM Hursley Instructions for managing your mailing list subscription are provided in the Listserv General Users Guide available at http://www.lsoft.com Archive: http://vm.akh-wien.ac.at/MQSeries.archive
opening multiple connections from C program on solaris
Hi, Is it possible to set-up multiple MQ connections from a program in Solaris env. I tired to set-up multiple connections, but the connection handle is the same for all of them. Is it possible to get unique connection-handles for each connection. The reason for this requirement is that the program has to handle multiple queues, and the application has to issue MQCMIT based on the data received in the queues. The program is designed for a real-time asynchronous communication. The application is up-running all the time and keeps polling it other interfaces to check if data has arrived. Based n the data received from other interfaces, it has to PUT the message into an MQ Queue and commit it. It is also a single -threaded application. mfg lakshmi The content of this e-mail is intended only for the confidential use of the person addressed. If you have received this message in error, please notify us immediately by electronic mail, by telephone or by fax at the above num- bers. E-mail communications are not secure and therefore we do not accept any res- ponsibility for the confidentiality or altered contents of this message. Please be aware that SIS Group and its subsidiary companies cannot accept any orders or other legally binding correspondence with a participant as part of an E-mail. The views expressed above are not necessarily those held by SIS Group and its subsidiary companies and not binding for them. exfe Instructions for managing your mailing list subscription are provided in the Listserv General Users Guide available at http://www.lsoft.com Archive: http://vm.akh-wien.ac.at/MQSeries.archive
