123 lines
4.3 KiB
HTML
123 lines
4.3 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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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="Copyright" content="Copyright (c) 2006 by IBM Corporation">
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<title>Information on the Pthread API examples</title>
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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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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<!-- Begin Header Records ========================================== -->
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<!-- NETMG2 SCRIPT A converted by B2H R4.1 (346) (CMS) by HOLTJM at -->
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<!-- RCHVMW2 on 29 Jan 1999 at 10:01:37 -->
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<!--File Edited November 2001 -->
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<!--End Header Records -->
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<link rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</head>
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<body>
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<!-- Java sync-link -->
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<script language="Javascript" src="../rzahg/synch.js" type="text/javascript">
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</script>
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<a name="Top_Of_Page"></a>
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<h2>Information on the Pthread API examples</h2>
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<p>The API documentation includes example programs for each API. The
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<a href="#326794">header file</a> shown below is used for all of the examples.
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It should be named <strong>check.h</strong> (member <strong>CHECK</strong> in
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file <strong>H</strong> in a library in the library list).</p>
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<p>In most cases, error checking that is contained in the examples causes the
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program to exit() if any failure is detected. In some cases, error checking is
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left out of the examples for brevity. In general, the error checking that is
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provided should not be considered complete enough for all applications. All
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return codes from any system functions should be validated and appropriate
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action should be taken when failures occur.</p>
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<p>The examples are provided "as-is" for demonstration and education purposes
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only. They do not necessarily provide or implement an appropriate level of
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error checking to be used for production code and should not be used directly
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for that purpose.</p>
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<p>Be sure to see <a href="concept1.htm">Writing and compiling threaded
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programs</a> and <a href="293735.htm">Running threaded programs</a> for more
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information about compiling and running the example programs.</p>
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<p>To create the examples, make sure the member <strong>CHECK</strong> is
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created in a file <strong>H</strong> in your library list. Use <strong>
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CRTCMOD</strong> on the name that you download the member to, then use <strong>
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CRTPGM</strong> to link the module into a program object. Alternatively, you
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can use <strong>CRTBNDC</strong> to compile and link the program in one
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step.</p>
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<p>When you run the example programs, you must be aware of a requirement:</p>
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<p>The job that runs a threaded program must be specially initialized by the
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system to support threads. Currently, several mechanisms allow you to start a
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job that is capable of creating multiple kernel threads.</p>
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<ul>
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<li>Use the i5/OS QShell Interpreter</li>
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<li>Use the spawn() API.</li>
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<li>Use the SMJOB CL command.</li>
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<li>Use the CRTJOBD CL command to create a special job description, then create
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your job using a mechanism that will use the job description.</li>
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</ul>
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<p>See <a href="293735.htm">Running threaded programs</a> for detailed
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information on these methods.</p>
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<p>See <a href="../apiref/aboutapis.htm#codedisclaimer">Code disclaimer information</a>
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for information pertaining to code examples.</p>
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<br>
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<h3><a name="326794">File check.h used by API examples programs</a></h3>
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<p>This example header file must be in the library list when you compile the
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example programs.</p>
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<pre>
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#ifndef _CHECK_H
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#define _CHECK_H
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/* headers used by a majority of the example program */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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/* Simple function to check the return code and exit the program
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if the function call failed
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*/
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static void checkResults(char *string, int rc) {
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if (rc) {
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printf("Error on : %s, rc=%d",
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string, rc);
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exit(EXIT_FAILURE);
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}
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return;
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}
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#endif
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</pre>
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<hr>
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<center>
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<table cellpadding="2" cellspacing="2">
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<tr align="center">
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<td valign="middle" align="center">
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<a href="#Top_Of_Page">Top</a> |
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<a href="rzah4mst.htm">Pthread APIs</a> |
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<a href="aplist.htm">APIs by category</a></td>
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</tr>
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</table>
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</center>
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</body>
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</html>
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