72 lines
6.5 KiB
HTML
72 lines
6.5 KiB
HTML
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<meta name="DC.Title" content="Prestart jobs for servers" />
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<meta name="abstract" content="In the prestart job model there is one primary listening job, generally called the daemon job or listener job, and multiple server jobs that process the client requests. The daemon job listens on the port for connection requests. When a new connection is received, the daemon does some general work, then gives the socket descriptor to a waiting prestart server job." />
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<meta name="description" content="In the prestart job model there is one primary listening job, generally called the daemon job or listener job, and multiple server jobs that process the client requests. The daemon job listens on the port for connection requests. When a new connection is received, the daemon does some general work, then gives the socket descriptor to a waiting prestart server job." />
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<title>Prestart jobs for servers</title>
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<body id="rzakspjeforservers"><a name="rzakspjeforservers"><!-- --></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">Prestart jobs for servers</h1>
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<div><p>In the prestart job model there is one primary listening job, generally
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called the daemon job or listener job, and multiple server jobs that process
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the client requests. The daemon job listens on the port for connection requests.
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When a new connection is received, the daemon does some general work, then
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gives the socket descriptor to a waiting prestart server job. </p>
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<p>Prestart jobs can be reused. When the job has completed the work for one
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client, the environment is reset and the job is made available to handle a
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request from a different client. </p>
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<p>For server jobs that run user code (for example, the remote command server),
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the job typically is not reused. This is because the user code might
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have changed something in the job and there is no sure way to reset the environment
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for a new client. If your server does reuse the job, the Change
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Job (QWTCHGJB) API can be used to change the job's attribute back to a known
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state after the client's request has completed. </p>
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<p>Servers that use the prestart job model include the host servers, SMTP
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server, PPP servers, DDM/DRDA Server, the SQL Server, and others.</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="rzaksaboutworkentries.htm" title="Work entries identify the sources where jobs can enter a subsystem. Specific types of work entries are used for different types of jobs. Work entries are part of the subsystem description.">Work entries</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="rzaksaboutautostartentry.htm" title="Autostart job entries identify the autostart jobs to start as soon as the subsystem starts. When a subsystem starts, the system allocates several items and starts autostart and prestart jobs before it is ready for work.">Autostart job entries</a></div>
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<div><a href="rzaksaboutcommentry.htm" title="The communications work entry identifies to the subsystem the sources for the communications job it will process. The job processing begins when the subsystem receives a communications program start request from a remote system and an appropriate routing entry is found for the request.">Communications entries</a></div>
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<div><a href="rzaksaboutjobqentries.htm" title="Job queue entries in a subsystem description specify from which job queues a subsystem is to receive jobs. When the subsystem is started, the subsystem tries to allocate each job queue defined in the subsystem job queue entries.">Job queue entries</a></div>
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<div><a href="rzaksprestartentryx.htm" title="You define the prestart job by using a prestart job entry. A prestart job entry does not affect the device allocation or program start request assignment.">Prestart job entries</a></div>
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<div><a href="rzaksaboutwrkstationentry.htm" title="An interactive job is a job that starts when a user signs on to a display station and ends when the user signs off. For the job to run, the subsystem searches for the job description, which may be specified in the workstation entry or the user profile.">Workstation entries</a></div>
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<div><a href="rzaksfindperforminfo.htm" title="This topic provides steps to help you answer the question, "How do I find the real user of a prestart job and determine the resources used by that prestart job?"">Prestart job investigation</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="../experience/work2abstract.htm">Tuning prestart job entries</a></div>
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</div>
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</div>
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</body>
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