81 lines
6.0 KiB
HTML
81 lines
6.0 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Types of message queues" />
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<meta name="abstract" content="All messages on the system are sent to a message queue." />
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<meta name="description" content="All messages on the system are sent to a message queue." />
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<meta name="DC.subject" content="message, queue, workstation message queue, job message queue, system operator (QSYSOPR) message queue, QSYSOPR message queue" />
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<meta name="keywords" content="message, queue, workstation message queue, job message queue, system operator (QSYSOPR) message queue, QSYSOPR message queue" />
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<meta name="DC.Relation" scheme="URI" content="msgusequeues.htm" />
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<meta name="DC.Relation" scheme="URI" content="wmsgs.htm" />
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<meta name="DC.Relation" scheme="URI" content="jmsgq.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Types of message queues</title>
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</head>
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<body id="tmtmq"><a name="tmtmq"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Types of message queues</h1>
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<div><p>All messages on the system are sent to a message queue. </p>
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<p>The system user or program associated with the message queue receives the
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message from the queue. Similarly, a reply to a message is sent back to the
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message queue of the user or program requesting the reply.</p>
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<p>The following diagrams show the message queues supplied by IBM<sup>®</sup>. A message
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queue is supplied for each display station (where DSP01 and DSP02 are display
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station names) and each user profile (where BOB and RAY are user profile names): <br /><img src="rbafn560.gif" alt="The following diagrams show the message queues supplied by IBM. A message queue is supplied for each display station (where DSP01 and DSP02 are display station names) and each user profile (where BOB and RAY are user profile names)." /><br /></p>
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<p>Job message queues are supplied for each job running on the system. Each
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job is given an external message queue (*EXT) and each call of an OPM program
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or ILE procedure within the job has its own call message queue.<br /><img src="rbafn561.gif" alt="Job message queues are supplied for each job running on the system. Each job is given an external message queue (*EXT) and each call of an OPM program or ILE procedure within the job has its own call message queue." /><br /></p>
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<p>Message queues are also supplied for the system history log (QHST) and
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the system operator (QSYSOPR):<br /><img src="rbafn562.gif" alt="Message queues are also supplied for the system history log (QHST) and the system operator (QSYSOPR)." /><br /></p>
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<p>These message queues are used as follows: </p>
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<ul><li>Workstation message queues are used for sending and receiving messages
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between workstation users and between workstation users and the system operator.
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The name of the queue is the same as the name of the workstation. The queue
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is created by the system when the workstation is described to the system.</li>
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<li>User profile message queues can be used for communication between users.
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User profile message queues are automatically created in library QUSRSYS
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when the user profile is created.</li>
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<li> Job message queues are used for receiving requests to be processed (such
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as commands) and for sending messages that result from processing the requests;
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the messages are sent to the requester of the job. Job message queues exist
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for each job and only exist for the life of the job. Job message queues consist
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of an external message queue (*EXT) and a set of call stack entry message
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queues. </li>
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<li>System operator message queue (QSYSOPR) is used for receiving and replying
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to messages from the system, display station users, and application programs.</li>
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<li>The history log message queue is used for any job in the system to have
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a record of high-level system activities.</li>
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</ul>
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<p>In addition to these message queues, you can create your own user message
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queues for sending messages to system users and between application programs.</p>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="msgusequeues.htm" title="This covers the types of message queues, how to create or change a message queue, and details about job message queues.">Use message queues</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="jmsgq.htm" title="Job message queues are created for each job on the system to handle all the message requirements of the job. Job message queues for a single job consist of an external message queue (*EXT) and a set of call message queues.">Job message queues</a></div>
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</div>
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<div class="reltasks"><strong>Related tasks</strong><br />
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<div><a href="wmsgs.htm" title="This discusses some of the ways that messages can be used to communicate between users and programs.">Messages</a></div>
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</div>
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</div>
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</body>
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</html>
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