58 lines
3.6 KiB
HTML
58 lines
3.6 KiB
HTML
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Printer file considerations for multithreaded programming" />
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<meta name="abstract" content="Only printer files opened with SPOOL(*YES) are allowed in a job that is capable of multithread operations." />
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<meta name="description" content="Only printer files opened with SPOOL(*YES) are allowed in a job that is capable of multithread operations." />
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<title>Printer file considerations for multithreaded programming</title>
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</head>
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<body id="rzahwprc-prcco"><a name="rzahwprc-prcco"><!-- --></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">Printer file considerations for multithreaded programming</h1>
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<div><p>Only printer files opened with SPOOL(*YES) are allowed in a job
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that is capable of multithread operations. </p>
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<div class="section"><p>Unspooled opens of printer files fail with a CPF4380 (Open attributes
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not valid in a multithreaded process) escape message sent to the function
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that requested the open. </p>
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</div>
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<div class="section"><p>Most SNA character string (SCS), Intelligent Printer
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Data Stream™ (IPDS™), Advanced Function Printing™ data
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stream (AFPDS), LINE, and USERASCII write operations are threadsafe. Write
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operations that are not threadsafe include those that use SCS graphics, those
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that the <span class="keyword">System/36™</span> Environment
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uses, those generated by the User Interface Manager (UIM), and those that
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use <span class="keyword">System/36</span> PRPQ subroutines.
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Page and line counts might be inaccurate because those counters cannot be
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atomically updated. </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 class="relref"><strong>Related reference</strong><br />
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<div><a href="rzahwdmcco.htm" title="You should consider several topics when managing data in a multithreaded program.">Data management considerations for multithreaded programming</a></div>
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</div>
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</div>
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