68 lines
4.7 KiB
HTML
68 lines
4.7 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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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Threads considerations for C language" />
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<meta name="abstract" content="You must evaluate existing C applications for thread safety before calling them in a multithreaded job. If your C program is not threadsafe, techniques are available for calling programs that are not threadsafe from multithreaded jobs." />
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<meta name="description" content="You must evaluate existing C applications for thread safety before calling them in a multithreaded job. If your C program is not threadsafe, techniques are available for calling programs that are not threadsafe from multithreaded jobs." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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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>Threads considerations for C language </title>
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</head>
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<body id="rzahwcee-ceeco"><a name="rzahwcee-ceeco"><!-- --></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">Threads considerations for C language </h1>
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<div><p>You must evaluate existing C applications for thread safety before
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calling them in a multithreaded job. If your C program is not threadsafe,
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techniques are available for calling programs that are not threadsafe from
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multithreaded jobs.</p>
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<div class="section"><p>Not all C library functions are threadsafe. Before
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calling your existing C applications in a multithread-capable job, refer to
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the <a href="../books/sc092712.pdf" target="_blank"><em>WebSphere<sup>®</sup> Development
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Studio: ILE C/C++ Programmer's Guide, SC09-2712</em> PDF</a> <img src="wbpdf.gif" alt="Link to PDF" /> and <a href="../books/sc097852.pdf " target="_blank"><em>WebSphere Development Studio: C/C++ Language Reference,
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SC09-4815</em> PDF</a><img src="wbpdf.gif" alt="Link to PDF" /> to determine whether all of your functions are threadsafe. </p>
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</div>
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<div class="section"><div class="p">When using programs that are written in C, use the following actions:<ul><li>Re-creation of Integrated Language Environment<sup>®</sup> (ILE)
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C applications:<p>Compile and bind all existing ILE C applications with <span class="cmdname">TGTRLS(*CURRENT)</span> before
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you call them in a multithreaded job.</p>
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</li>
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<li>Elimination of *NEW activation groups:<div class="p">You should not use *NEW activation
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groups in multithreaded applications. <div class="note"><span class="notetitle">Note:</span> ACTGRP(*NEW) is the default on <span class="cmdname">CRTPGM</span> and <span class="cmdname">CRTBNDC</span> commands.</div>
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</div>
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</li>
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<li>Calling ILE C *PGM objects:<p>If you need to call an ILE C *PGM object
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that has an activation group of *NEW, either start another process to run
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the second program or create the second program specifying a named activation
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group.</p>
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</li>
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</ul>
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</div>
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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="rzahwlanco.htm" title="Learn how different languages support threads on i5/OS. This information can help you evaluate how threads can be implemented in your own application.">Language access and threads</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="rzahwnsfco.htm" title="The most common programming error when writing a threaded application is the use of APIs or system services that are not thread safe.">Calling functions that are not threadsafe</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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