73 lines
4.8 KiB
HTML
73 lines
4.8 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 http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="task" />
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<meta name="DC.Title" content="Allocate data queues" />
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<meta name="abstract" content="If all users of a data queue allocate it before using it, this helps to ensure that a data queue is not accessed by more than one job at a time." />
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<meta name="description" content="If all users of a data queue allocate it before using it, this helps to ensure that a data queue is not accessed by more than one job at a time." />
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<meta name="DC.subject" content="data queue, allocating, sending data" />
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<meta name="keywords" content="data queue, allocating, sending data" />
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<meta name="DC.Relation" scheme="URI" content="qcomm.htm" />
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<meta name="DC.Relation" scheme="URI" content="../cl/alcobj.htm" />
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<meta name="DC.Relation" scheme="URI" content="../cl/dlcobj.htm" />
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<meta name="DC.Relation" scheme="URI" content="../cl/monmsg.htm" />
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<meta name="DC.Relation" scheme="URI" content="monmg.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Identifier" content="alloq" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Allocate data queues</title>
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</head>
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<body id="alloq"><a name="alloq"><!-- --></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">Allocate data queues</h1>
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<div><p>If all users of a data queue allocate it before using it, this
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helps to ensure that a data queue is not accessed by more than one job at
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a time.</p>
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<div class="section"> <p>If your application requires that a data queue is not accessed
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by more than one job at a time, it should be coded to include an <span class="cmdname">Allocate
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Object (ALCOBJ)</span> command before using a data queue. The data queue
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should then be deallocated using the <span class="cmdname">Deallocate Object (DLCOBJ)</span> command
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when the application is finished using it.</p>
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<p>The ALCOBJ command does <em>not</em>,
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by itself, restrict another job from sending or receiving data from a data
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queue or clearing a data queue. However, if all applications are coded to
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include the ALCOBJ command before any use of a data queue, the allocation
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of a data queue already allocated to another job will fail, preventing the
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data queue from use by more than one job at a time.</p>
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<p>When an allocation
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fails because the data queue is already allocated to another job, the system
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issues an error message, CPF1002. The <span class="cmdname">Monitor Message (MONMSG)</span> command
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can be used in the application procedure to monitor for this message and respond
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to the error message. Possible responses include sending a message to the
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user and attempting to allocate the data queue again. </p>
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</div>
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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="qcomm.htm" title="Data queues are a type of system object that you can create, to which one HLL procedure or program can send data, and from which another HLL procedure or program can receive data.">Use data 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="monmg.htm" title="You can monitor for exception messages. Exception messages include escape, notify, and status messages that are sent to your CL procedure's or program's call message queue by the commands in your procedure or program or by commands in another procedure or program. Diagnostic messages cannot be monitored.">Monitor for messages in a CL program or procedure</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../cl/alcobj.htm">Allocate Object (ALCOBJ) command</a></div>
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<div><a href="../cl/dlcobj.htm">Deallocate Object (DLCOBJ) command</a></div>
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<div><a href="../cl/monmsg.htm">Monitor Message (MONMSG) command</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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