75 lines
5.2 KiB
HTML
75 lines
5.2 KiB
HTML
<?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="How the server allocates resources" />
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<meta name="abstract" content="When it allocates resources, the server waits for a predefined time if the resources are not immediately available. If the resources do not become available within the time limit, the server generates an error." />
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<meta name="description" content="When it allocates resources, the server waits for a predefined time if the resources are not immediately available. If the resources do not become available within the time limit, the server generates an error." />
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<meta name="DC.subject" content="operation, starting program on remote server, allocating resources, WAITFILE parameter, number-of-seconds value (WAITFILE), parameter, WAITFILE" />
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<meta name="keywords" content="operation, starting program on remote server, allocating resources, WAITFILE parameter, number-of-seconds value (WAITFILE), parameter, WAITFILE" />
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<title>How the server allocates resources</title>
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</head>
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<body id="rbal3howalloc"><a name="rbal3howalloc"><!-- --></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">How the server allocates resources</h1>
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<div><p>When it allocates resources, the server waits for a predefined
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time if the resources are not immediately available. If the resources do not
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become available within the time limit, the server generates an error.</p>
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<p>If you are using the <a href="../cl/alcobj.htm">ALCOBJ command</a>, the command fails. If your program is
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performing a file operation, that operation fails, and the server sends an
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error message to the program message queue. You can use the error-handling
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functions of your high-level language to try the operation again. For example,
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if an open operation fails because another job is using the device associated
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with the file, you can try the open operation a specified number of times
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again, in the hope that the other job would finish with the device and your
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program would then be able to use it.</p>
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<p>The length of time that the server waits when allocating resources is specified
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on the <a href="../cl/alcobj.htm">ALCOBJ</a> command
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and on the WAITFILE parameter of the CL command used to create the file. If
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the ALCOBJ command is used before running a program, then the value of the
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WAITFILE parameter does not matter, because the resources will be available.</p>
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<p>If your application has error handling procedures for handling device errors
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occurring on device files, you should specify a value of something other than
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*IMMED to allow the server to recover from the error. The allocation of resources
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requested by your program on an open or acquire operation that allows your
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program to recover from the error will not be successful until the server
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recovery procedures have been completed for the device.</p>
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<p>The following list describes the values that are allowed for
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the WAITFILE parameter:</p>
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<dl><dt class="dlterm">*IMMED</dt>
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<dd>This value specifies that no wait time is allowed. An immediate allocation
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of the file resources is required.</dd>
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<dt class="dlterm">*CLS</dt>
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<dd>The job default wait time is used as the wait time for the file resources
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to be allocated.</dd>
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<dt class="dlterm">number-of-seconds</dt>
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<dd>Specify the maximum number of seconds that the program is to wait for
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the file resources to be allocated. Valid values are 1 through 32767 (32 767
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seconds).</dd>
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</dl>
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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="rbal3waitf.htm" title="Resources are those parts of the server that are required by a job or task, including main storage, devices, the processing unit, programs, files, libraries, and folders. When you write a high-level language program, you should be aware of what resources the server has allocated for each file type.">Allocate file resources</a></div>
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</div>
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</div>
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</body>
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</html> |