139 lines
5.4 KiB
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139 lines
5.4 KiB
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<title>The GNU Fortran Compiler: ALARM</title>
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<p>
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Next: <a href="ALL.html#ALL" accesskey="n" rel="next">ALL</a>, Previous: <a href="AINT.html#AINT" accesskey="p" rel="prev">AINT</a>, Up: <a href="Intrinsic-Procedures.html#Intrinsic-Procedures" accesskey="u" rel="up">Intrinsic Procedures</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="ALARM-_002d_002d_002d-Execute-a-routine-after-a-given-delay"></a>
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<h3 class="section">9.12 <code>ALARM</code> — Execute a routine after a given delay</h3>
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<a name="index-ALARM"></a>
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<a name="index-delayed-execution"></a>
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<dl compact="compact">
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<dt><em>Description</em>:</dt>
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<dd><p><code>ALARM(SECONDS, HANDLER [, STATUS])</code> causes external subroutine <var>HANDLER</var>
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to be executed after a delay of <var>SECONDS</var> by using <code>alarm(2)</code> to
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set up a signal and <code>signal(2)</code> to catch it. If <var>STATUS</var> is
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supplied, it will be returned with the number of seconds remaining until
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any previously scheduled alarm was due to be delivered, or zero if there
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was no previously scheduled alarm.
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</p>
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</dd>
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<dt><em>Standard</em>:</dt>
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<dd><p>GNU extension
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</p>
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</dd>
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<dt><em>Class</em>:</dt>
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<dd><p>Subroutine
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</p>
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</dd>
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<dt><em>Syntax</em>:</dt>
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<dd><p><code>CALL ALARM(SECONDS, HANDLER [, STATUS])</code>
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</p>
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</dd>
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<dt><em>Arguments</em>:</dt>
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<dd><table>
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<tr><td width="15%"><var>SECONDS</var></td><td width="70%">The type of the argument shall be a scalar
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<code>INTEGER</code>. It is <code>INTENT(IN)</code>.</td></tr>
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<tr><td width="15%"><var>HANDLER</var></td><td width="70%">Signal handler (<code>INTEGER FUNCTION</code> or
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<code>SUBROUTINE</code>) or dummy/global <code>INTEGER</code> scalar. The scalar
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values may be either <code>SIG_IGN=1</code> to ignore the alarm generated
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or <code>SIG_DFL=0</code> to set the default action. It is <code>INTENT(IN)</code>.</td></tr>
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<tr><td width="15%"><var>STATUS</var></td><td width="70%">(Optional) <var>STATUS</var> shall be a scalar
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variable of the default <code>INTEGER</code> kind. It is <code>INTENT(OUT)</code>.</td></tr>
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</table>
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</dd>
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<dt><em>Example</em>:</dt>
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<dd><div class="smallexample">
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<pre class="smallexample">program test_alarm
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external handler_print
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integer i
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call alarm (3, handler_print, i)
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print *, i
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call sleep(10)
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end program test_alarm
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</pre></div>
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<p>This will cause the external routine <var>handler_print</var> to be called
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after 3 seconds.
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</p></dd>
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</dl>
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