78 lines
5.7 KiB
HTML
78 lines
5.7 KiB
HTML
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<meta name="DC.Title" content="Common multithreaded programming errors" />
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<meta name="abstract" content="Several programming errors often occur when writing multithreaded applications." />
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<title>Common multithreaded programming errors</title>
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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">Common multithreaded programming errors</h1>
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<div><p>Several programming errors often occur when writing multithreaded
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applications.</p>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rzahwnsfco.htm">Calling functions that are not threadsafe</a></strong><br />
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The most common programming error when writing a threaded application is the use of APIs or system services that are not thread safe.</li>
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<li class="ulchildlink"><strong><a href="rzahwfaico.htm">Thread creation not allowed failure</a></strong><br />
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<span class="keyword">i5/OS™</span> does not
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allow every process on the system to create threads at every time while running.</li>
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<li class="ulchildlink"><strong><a href="rzahwterco.htm">Activation group ending</a></strong><br />
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The <span class="keyword">i5/OS™</span> Integrated
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Language Environment<sup>®</sup> (ILE) program model uses activation groups as a
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way to encapsulate resources for an application program within a job.</li>
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<li class="ulchildlink"><strong><a href="rzahwmixco.htm">Mixing thread models</a></strong><br />
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Do not mix Pthreads APIs with other thread management APIs that might be provided by the system.</li>
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<li class="ulchildlink"><strong><a href="rzahwmitco.htm">Commit operations in multithreaded programs</a></strong><br />
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Database transactions in <span class="keyword">i5/OS™</span> are
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scoped to the job or the activation group.</li>
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<li class="ulchildlink"><strong><a href="rzahwdioco.htm">Database record I/O and thread safety</a></strong><br />
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You can use the I/O feedback area of a database file to communicate results of I/O operations to the record I/O user. A typical application might have problems with thread safety because of the nature of the feedback area.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzahwmulco.htm" title="If you are going to write multithreaded applications or server applications for i5/OS, you should be familiar with several techniques.">Multithreaded programming techniques</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="rzahwoneco.htm" title="At times, you might want to defer the initialization of resources until a thread requires them. However, your application might require that multiple threads use a certain resource, which requires you to initialize the resource only once in a threadsafe way.">One-time initialization and thread safety</a></div>
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<div><a href="rzahwnonco.htm" title="Your multithreaded application at times requires access to functions or system services that are not thread safe. There are few completely safe alternatives for calling these functions.">Function calls that are not thread safe</a></div>
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<div><a href="rzahwbugco.htm" title="Use the concepts and techniques that are described here to learn about debugging and servicing multithreaded jobs:">Debugging and servicing of multithreaded jobs</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="../apis/trouble.htm">Troubleshooting pthread errors</a></div>
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</div>
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