81 lines
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81 lines
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<meta name="abstract" content="This is an example of transferring control to improve performance." />
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<title>Example: Use the Transfer Control (TFRCTL) command</title>
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<body id="tfr"><a name="tfr"><!-- --></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">Example: Use the Transfer Control (TFRCTL) command</h1>
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<div><p>This is an example of transferring control to improve performance.</p>
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<div class="section"> <p>In the following illustration, if Program A is specified with
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USRPRF(*OWNER), the owner's authorities are in effect for all of the programs
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shown. If Program B is specified with USRPRF(*OWNER), the owner's authorities
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are in effect only while Programs B and C are active. When Program B transfers
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control to Program D, Program B is no longer in the call stack and the owner
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of Program B is no longer considered for authorization during the running
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of Program D. When the programs complete processing (by returning or transferring
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control), the owner's authorities are no longer in effect. Any overrides
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issued by Program B remain in effect while Program D is running and are lost
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when Program D does a return.<br /><img src="rbafn546.gif" alt="In this illustration, if Program A is specified with USRPRF(*OWNER), the owner's authorities are in effect for all of the programs shown. If Program B is specified with USRPRF(*OWNER), the owner's authorities are in effect only while Programs B and C are active. When Program B transfers control to Program D, Program B is no longer in the call stack and the owner of Program B is no longer considered for authorization during the running of Program D. When the programs complete processing (by returning or transferring control), the owner's authorities are no longer in effect. Any overrides issued by Program B remain in effect while Program D is running and are lost when Program D does a return." /><br /></p>
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<p>The <span class="cmdname">Transfer
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Control (TFRCTL)</span> command has the following format: </p>
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<pre>TFRCTL PGM(library-name/program-name) PARM(CL-variable)</pre>
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<p>The program (and library qualifier) may be a variable.</p>
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<p>It
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is important to note that only variables may be used as parameter arguments
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on this command, and that those variables must have been received as a parameter
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in the argument list from the program that called the transferring program.
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That is, the <span class="cmdname">Transfer Control (TFRCTL)</span> command cannot
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pass a variable that was not passed to the program running the <span class="cmdname">Transfer
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Control (TFRCTL)</span> command.</p>
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<p>In the following example, the first <span class="cmdname">Transfer
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Control (TFRCTL)</span> is valid. The second <span class="cmdname">Transfer Control
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(TFRCTL)</span> command is not valid because &B was not passed to this
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program. The third TFRCTL command is not valid because a constant cannot
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be specified as an argument. </p>
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<pre>PGM PARM(&A)
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DCL &A *DEC 3
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DCL &B *CHAR 10
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IF (&A *GT 100) THEN (TFRCTL PGM(PGMA) PARM(&A)) /* valid */
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IF (&A *GT 50) THEN (TFRCTL PGM(PGMB) PARM(&B)) /* not valid */
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ELSE (TFRCTL PGM(PGMC) PARM('1')) /* not valid */
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ENDPGM</pre>
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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="tfrct.htm" title="The Transfer Control (TFRCTL) command calls the program specified on the command, passes control to it, and removes the transferring program from the call stack.">Transfer control to improve performance</a></div>
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</div>
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<div class="reltasks"><strong>Related tasks</strong><br />
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<div><a href="passp.htm" title="When you pass control to another program or procedure, you can also pass information to it for modification or use within the receiving program or procedure.">Pass parameters</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="../cl/tfrctl.htm">Transfer Control (TFRCTL) command</a></div>
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</div>
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</div>
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