81 lines
4.9 KiB
HTML
81 lines
4.9 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="Multithreaded job debugging" />
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<meta name="abstract" content="The spawn() API provides a mechanism to allow you to start a debugging session before actually calling the multithreaded program to be debugged." />
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<meta name="description" content="The spawn() API provides a mechanism to allow you to start a debugging session before actually calling the multithreaded program to be debugged." />
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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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<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>Multithreaded job debugging</title>
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</head>
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<body id="rzahwdeb-debco"><a name="rzahwdeb-debco"><!-- --></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">Multithreaded job debugging</h1>
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<div><p>The <span class="apiname">spawn()</span> API provides a mechanism to allow
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you to start a debugging session before actually calling the multithreaded
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program to be debugged.</p>
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<div class="section"><p>Setting the QIBM_CHILD_JOB_SNDINQMSG environment variable to 1
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controls this capability. Refer to the usage notes for the spawn() API in
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the System API Reference, for details about the use of this environment variable.</p>
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</div>
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<div class="section"><p>An example <span class="cmdname">SPAWN</span> command is available for your
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use and modification as part of <span class="keyword">i5/OS™</span> option
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7, the <span class="keyword">i5/OS</span> Example Tools
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Library, QUSRTOOL. Member TP0ZINFO in the file QATTINFO in the QUSRTOOL library
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contains information about how to create the <span class="cmdname">SPAWN</span> CL command.</p>
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</div>
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<div class="section"><p>You can also simplify the process of starting a job that runs
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the multithreaded program and the debugging session by creating a command
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(such as the SPAWN command) that performs the necessary steps. The steps
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are as follows: </p>
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<ul><li>Signing on to a display station session</li>
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<li>Starting a job to run the multithreaded program</li>
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<li>Using the <span class="cmdname">Start Service Job (STRSRVJOB)</span> command to
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service the job running the multithreaded program</li>
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<li>Calling the <span class="cmdname">Start Debug (STRDBG)</span> command, adding programs
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to debug, and setting breakpoints</li>
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<li>Notifying the servicing job when the thread hits a breakpoint so that
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it stops the thread</li>
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<li>Stopping all threads with the debugger support</li>
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<li>Issuing valid debug commands from the debug screen that is displayed</li>
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<li>Resuming the thread that hit the breakpoint and then all other threads</li>
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<li>Repeating the above cycle until debugging is complete</li>
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<li>Calling the <span class="cmdname">End Debug (ENDDBG)</span> command</li>
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</ul>
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</div>
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<div class="section"><p>You can find additional information about thread debugging capabilities
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in the following topics:</p>
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<ul><li><a href="../apiref/api.htm">APIs</a></li>
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<li><a href="../apis/concep32.htm">SPAWN CL
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command, QUSRTOOL example</a></li>
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<li><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" /></li>
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<li><a href="../books/sc415606.pdf" target="_blank"><em>ILE
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Concepts, SC41-5606</em> PDF</a> <img src="wbpdf.gif" alt="Link to PDF" /></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 class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <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>
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</body>
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</html>
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