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| <h3 class="section">8.12 <code>ALARM</code> — Execute a routine after a given delay</h3> |
| |
| <p><a name="index-ALARM-411"></a><a name="index-delayed-execution-412"></a> |
| <dl> |
| <dt><em>Description</em>:<dd><code>ALARM(SECONDS, HANDLER [, STATUS])</code> causes external subroutine <var>HANDLER</var> |
| to be executed after a delay of <var>SECONDS</var> by using <code>alarm(2)</code> to |
| set up a signal and <code>signal(2)</code> to catch it. If <var>STATUS</var> is |
| supplied, it will be returned with the number of seconds remaining until |
| any previously scheduled alarm was due to be delivered, or zero if there |
| was no previously scheduled alarm. |
| |
| <br><dt><em>Standard</em>:<dd>GNU extension |
| |
| <br><dt><em>Class</em>:<dd>Subroutine |
| |
| <br><dt><em>Syntax</em>:<dd><code>CALL ALARM(SECONDS, HANDLER [, STATUS])</code> |
| |
| <br><dt><em>Arguments</em>:<dd> |
| <p><table summary=""><tr align="left"><td valign="top" width="15%"><var>SECONDS</var> </td><td valign="top" width="70%">The type of the argument shall be a scalar |
| <code>INTEGER</code>. It is <code>INTENT(IN)</code>. |
| <br></td></tr><tr align="left"><td valign="top" width="15%"><var>HANDLER</var> </td><td valign="top" width="70%">Signal handler (<code>INTEGER FUNCTION</code> or |
| <code>SUBROUTINE</code>) or dummy/global <code>INTEGER</code> scalar. The scalar |
| values may be either <code>SIG_IGN=1</code> to ignore the alarm generated |
| or <code>SIG_DFL=0</code> to set the default action. It is <code>INTENT(IN)</code>. |
| <br></td></tr><tr align="left"><td valign="top" width="15%"><var>STATUS</var> </td><td valign="top" width="70%">(Optional) <var>STATUS</var> shall be a scalar |
| variable of the default <code>INTEGER</code> kind. It is <code>INTENT(OUT)</code>. |
| <br></td></tr></table> |
| |
| <br><dt><em>Example</em>:<dd> |
| <pre class="smallexample"> program test_alarm |
| external handler_print |
| integer i |
| call alarm (3, handler_print, i) |
| print *, i |
| call sleep(10) |
| end program test_alarm |
| </pre> |
| <p>This will cause the external routine <var>handler_print</var> to be called |
| after 3 seconds. |
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