71 lines
4.5 KiB
HTML
71 lines
4.5 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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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Threads considerations for Java language" />
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<meta name="abstract" content="You can take advantage of i5/OS kernel threads using the java.lang.Thread class. Java threads operate on top of the i5/OS kernel threads model. Each Java thread is one of many tasks that runs in the process." />
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<meta name="description" content="You can take advantage of i5/OS kernel threads using the java.lang.Thread class. Java threads operate on top of the i5/OS kernel threads model. Each Java thread is one of many tasks that runs in the process." />
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<meta name="DC.Relation" scheme="URI" content="rzahwlanco.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzahwrzahwcexcodex.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rzahwjav-javco" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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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 Java language </title>
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</head>
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<body id="rzahwjav-javco"><a name="rzahwjav-javco"><!-- --></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 Java language </h1>
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<div><p>You can take advantage of <span class="keyword">i5/OS™</span> kernel
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threads using the <span class="filepath">java.lang.Thread</span> class. Java™ threads
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operate on top of the <span class="keyword">i5/OS</span> kernel
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threads model. Each Java thread is one of many tasks that runs
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in the process.</p>
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<div class="section"><p>You can do all of the activities that are listed in the Threads
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Management section.</p>
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</div>
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<div class="section"><p>The Java virtual machine (JVM) always creates
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several threads to perform services such as Java garbage collection. The system uses
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these threads; applications should not use them.</p>
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</div>
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<div class="section"><p>You can use native methods to access system functions that are
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not available in Java. Native methods are not *PGM objects. They are
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procedures that are exported from Integrated Language
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Environment<sup>®</sup> (ILE) service programs (*SRVPGM). These native methods always
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run in processes that are multithreaded so they must be threadsafe. The ILE
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COBOL, RPG IV, CL, C and C++ compilers are threadsafe. </p>
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<div class="note"><span class="notetitle">Note:</span> Not
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all standard C and C++ functions are threadsafe. Refer to the <a href="../rzahg/rzahgcandcplus.htm">C and C++</a> topic in
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the information center.</div>
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</div>
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<div class="section"><p>When it is necessary to call an ILE program (*PGM) object, use <span class="filepath">java.lang.Runtime.exec()</span> to
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start another process in which the program can run.</p>
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</div>
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<div class="section"><p>Use <span class="cmdname">exit()</span> and <span class="cmdname">abort()</span> with
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care. These functions end the application, including the process and all the
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threads that run in the process.</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="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="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzahwrzahwcexcodex.htm" title="These examples are used throughout this topic.">Examples: Threads</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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