58 lines
4.0 KiB
HTML
58 lines
4.0 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="concept" />
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<meta name="DC.Title" content="Use a control boundary as a base" />
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<meta name="abstract" content="You can identify the base call stack entry as the one at the nearest control boundary by using the special value *CTLBDY." />
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<meta name="description" content="You can identify the base call stack entry as the one at the nearest control boundary by using the special value *CTLBDY." />
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<meta name="DC.subject" content="example, using *CTLBDY" />
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<meta name="keywords" content="example, using *CTLBDY" />
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<meta name="DC.Relation" scheme="URI" content="callid.htm" />
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<meta name="DC.Relation" scheme="URI" content="callrecentasbase.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Identifier" content="callcontrolasbase" />
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<title>Use a control boundary as a base</title>
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</head>
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<body id="callcontrolasbase"><a name="callcontrolasbase"><!-- --></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">Use a control boundary as a base</h1>
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<div><p>You can identify the base call stack entry as the one at the nearest
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control boundary by using the special value *CTLBDY.</p>
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<p>A control boundary exists between two call stack entries if the two entries
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are running in two different activation groups. The one identified by using
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this special value is running in the same activation group as the entry that
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is sending the message.</p>
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<p>See the second figure for an example of sending a message
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using the special value *CTLBDY. The three programs in this example (CLPGM91,
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CLPGM92, and CLPGM93) are all ILE programs. CLPGM91 runs in activation group
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AG91 while both CLPGM92 and CLPGM93 run in activation group AG92. In this
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example, PROC93A sends a message back to the entry that immediately precedes
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the boundary for AG92.</p>
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<div class="fignone" id="callcontrolasbase__sndfig8"><a name="callcontrolasbase__sndfig8"><!-- --></a><span class="figcap">Figure 1. Example of *PGMNAME</span><br /><img src="rbafn570.gif" alt="" /><br /></div>
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<div class="fignone" id="callcontrolasbase__sndfig9"><a name="callcontrolasbase__sndfig9"><!-- --></a><span class="figcap">Figure 2. Example of using *CTLBDY</span><br /><img src="rbafn571.gif" alt="" /><br /></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="callid.htm" title="If a CL procedure is to send a message to an OPM program or another ILE procedure, you must identify the call stack entry to which the message is sent.">Identify a call stack entry</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="callrecentasbase.htm" title="You can specify the most recently called procedure as the base call stack entry by using the *PGMNAME special value.">Use the most recently called procedure as a base</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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