Symbian3/SDK/Source/GUID-B4039418-6499-555D-AC24-9B49161299F2.dita
author Dominic Pinkman <Dominic.Pinkman@Nokia.com>
Thu, 21 Jan 2010 18:18:20 +0000
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License 
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"Eclipse Public License v1.0" which accompanies this distribution, 
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors: 
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept xml:lang="en" id="GUID-B4039418-6499-555D-AC24-9B49161299F2"><title>Creating a Periodic Timer</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>You can use a periodic timer to provide repeated signals to your process. </p> <p>The following example illustrates a periodic timer with a delay of a second and a repeating interval of ten milliseconds. It also configures a thread function as the timer expiry notification using <codeph>SIGEV_THREAD</codeph>. </p> <p>The following example code performs the following tasks: </p> <ol id="GUID-B648631F-8CC2-5304-B2DC-6A9293385E3E"><li id="GUID-228938F5-3F52-5853-96FC-2556650A617A"><p>Creates a notification function (thread function) that must be invoked after timer expiry. </p> </li> <li id="GUID-7F02B8B1-7AE3-566A-A864-A64B45837C79"><p>Sets the thread priority to <b>255</b> using the thread scheduling parameters (<codeph>struct sched_param</codeph>). This ensures that the thread function has the highest priority when it is invoked as a result of a timer expiry. </p> </li> <li id="GUID-14F0D0AC-65EF-56B6-B82A-EC41C4DDA94F"><p>Creates a timer based on the current system time (<codeph>CLOCK_REALTIME</codeph>) and a notification function (<codeph>struct
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             sigevent sig</codeph>) that must be invoked when the timer expires. </p> </li> <li id="GUID-0A915D17-5113-563B-9CE4-7A7B7B7D7B23"><p>Defines the input values for <xref href="GUID-344F836B-FAC8-344A-B458-0CEFB714ADEB.dita"><apiname>timer_settime()</apiname></xref>. The key input values are the timer value (<codeph>in.it_value.tv_sec = 1;</codeph>) and the interval (<codeph>in.it_interval.tv_nsec = 100000000;</codeph>). The periodic timer will expire after a second and then invoke the notification function every one-tenth of a second until it is destroyed. </p> </li> <li id="GUID-126A5B20-133D-585A-9FF9-9CB5456D2D71"><p>Starts the periodic timer using <xref href="GUID-344F836B-FAC8-344A-B458-0CEFB714ADEB.dita"><apiname>timer_settime()</apiname></xref>. </p> </li> <li id="GUID-FD1EEA8C-3215-5DBE-BB29-47576DED3955"><p>Uses <codeph>sleep(2)</codeph> to pause the program execution for two seconds before destroying the timer. </p> </li> </ol> <codeblock id="GUID-60B88762-E6C3-52F8-8DBC-E77D70B03FAE" xml:space="preserve">#include &lt;time.h&gt;
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#include &lt;stdio.h&gt;
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#include &lt;signal.h&gt;
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#include &lt;pthread.h&gt;
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#include &lt;unistd.h&gt;
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#include &lt;errno.h&gt;
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static int i = 0;
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//Thread function to be invoked when the periodic timer expires
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void sighler (union sigval val)
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    {
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    printf("Handler entered with value :%d for %d times\n", val.sival_int, ++i);
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    }
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int main()
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    {
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    int Ret;
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    pthread_attr_t attr;
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    pthread_attr_init( &amp;attr );
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    struct sched_param parm;
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    parm.sched_priority = 255;
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    pthread_attr_setschedparam(&amp;attr, &amp;parm);
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    struct sigevent sig;
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    sig.sigev_notify = SIGEV_THREAD;
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    sig.sigev_notify_function = sighler;
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    sig.sigev_value.sival_int =20;
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    sig.sigev_notify_attributes = &amp;attr;
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    //create a new timer.
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    timer_t timerid;
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    Ret = timer_create(CLOCK_REALTIME, &amp;sig, &amp;timerid);
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    if (Ret == 0)
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        {
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        struct itimerspec in, out;
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        in.it_value.tv_sec = 1;
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        in.it_value.tv_nsec = 0;
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        in.it_interval.tv_sec = 0;
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        in.it_interval.tv_nsec = 100000000;
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        //issue the periodic timer request here.
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        Ret = timer_settime(timerid, 0, &amp;in, &amp;out);
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        if(Ret == 0)
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            sleep(2);
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        else
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            printf("timer_settime() failed with %d\n", errno);
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        //delete the timer.
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        timer_delete(timerid);
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        }
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    else
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    printf("timer_create() failed with %d\n", errno);
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    return Ret;
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    }</codeblock> <p>The output of the above program is: </p> <codeblock id="GUID-313450D1-6766-58C6-933C-49AD55A5D985" xml:space="preserve">Handler entered with value :20 for 1 times
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Handler entered with value :20 for 2 times
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Handler entered with value :20 for 3 times
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Handler entered with value :20 for 4 times
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Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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Handler entered with value :20 for 5 times
89d6a7a84779 Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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    70
Handler entered with value :20 for 6 times
89d6a7a84779 Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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    71
Handler entered with value :20 for 7 times
89d6a7a84779 Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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Handler entered with value :20 for 8 times</codeblock> <p> <b>Note:</b> Ideally, in the preceding output the handler must have entered <b>10</b> times. This is not the case on Symbian platform as there is some latency due to the timer emulation solution and the underlying Symbian platform clock resolution. </p> </conbody></concept>