70 lines
5.0 KiB
HTML
70 lines
5.0 KiB
HTML
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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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<meta name="DC.Title" content="Multithreaded program startup commands" />
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<meta name="abstract" content="To call a multithreaded Integrated Language Environment (ILE) program, the job in which the program is called must be capable of supporting multiple threads (multithread-capable). Multithreaded Java programs can be called in most jobs (some system jobs restrict the types of programs that can be called)." />
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<meta name="description" content="To call a multithreaded Integrated Language Environment (ILE) program, the job in which the program is called must be capable of supporting multiple threads (multithread-capable). Multithreaded Java programs can be called in most jobs (some system jobs restrict the types of programs that can be called)." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<title>Multithreaded program startup commands</title>
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</head>
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<body id="rzahwead-eadco"><a name="rzahwead-eadco"><!-- --></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">Multithreaded program startup commands</h1>
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<div><p>To call a multithreaded Integrated Language
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Environment<sup>®</sup> (ILE) program, the job in which the program is called must
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be capable of supporting multiple threads (multithread-capable). Multithreaded Java™ programs
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can be called in most jobs (some system jobs restrict the types of programs
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that can be called).</p>
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<div class="section"><p>In the <span class="keyword">i5/OS™</span> kernel
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threads support, only a subset of the supported job types can create threads.
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Interactive and communication jobs do no provide multithread-capable support.</p>
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</div>
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<div class="section"><p>The parameter <span class="parmname">Allow Multithread (ALWMLTTHD)</span>,
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which is located in the <span class="cmdname">Create Job Description (CRTJOBD)</span> and <span class="cmdname">Change
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Job Description (CHGJOBD)</span> commands, controls whether the job supports
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multiple threads. <span class="keyword">i5/OS</span> examines
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all job types except communications jobs and interactive jobs for the <span class="parmname">ALWMLTTHD</span> parameter.
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The <span class="cmdname">Add Prestart Job Entry (ADDPJE)</span> and <span class="cmdname">Change
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Prestart Job Entry (CHGPJE)</span> subsystem description job entry commands
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use the <span class="parmname">ALWMLTTHD</span> setting to control whether jobs started
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through the entry are capable of supporting multiple threads.</p>
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</div>
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<div class="section"><p>The <span class="apiname">spawn()</span> API, Spawn Process,
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supports a new flag field in the inheritance structure that controls whether
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the child process can support multiple threads. This flag field, SPAWN_SETTHREAD_NP,
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is a non-standard, <span class="keyword">i5/OS</span> platform-specific
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extension to the inheritance structure. The <span class="apiname">spawn()</span> API
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is the only programming method that can start a batch immediate or prestart
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job that is capable of supporting multiple threads. You can write a <span class="cmdname">SPAWN</span> command,
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similar to the CALL command, to simplify calling multithreaded programs.
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An example <span class="cmdname">SPAWN</span> command is available for your use and
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modification as part of <span class="keyword">i5/OS</span> option
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7, the <span class="keyword">i5/OS</span> Example Tools
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Library, QUSRTOOLS.</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="rzahwas4co.htm" title="All programs have at least one thread, referred to as the initial thread. In a program with multiple threads, each thread runs its code independently of the other threads in the program.">Threads on i5/OS</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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