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Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/_real_life_wait_loop_8cpp_source.html
author Dominic Pinkman <dominic.pinkman@nokia.com>
Fri, 13 Aug 2010 16:47:46 +0100
changeset 14 578be2adaf3e
parent 6 43e37759235e
permissions -rw-r--r--
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
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<title>TB9.2 Example Applications: examples/Base/IPC/Async/RealLifeWaitLoop/RealLifeWaitLoop.cpp Source File</title>
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<link href="tabs.css" rel="stylesheet" type="text/css"/>
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<link href="doxygen.css" rel="stylesheet" type="text/css"/>
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</head>
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<body>
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<!-- Generated by Doxygen 1.6.2 -->
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<h1>examples/Base/IPC/Async/RealLifeWaitLoop/RealLifeWaitLoop.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Copyright (c) 2000-2009 Nokia Corporation and/or its subsidiary(-ies).</span>
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<a name="l00002"></a>00002 <span class="comment">// All rights reserved.</span>
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<a name="l00003"></a>00003 <span class="comment">// This component and the accompanying materials are made available</span>
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<a name="l00004"></a>00004 <span class="comment">// under the terms of &quot;Eclipse Public License v1.0&quot;</span>
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<a name="l00005"></a>00005 <span class="comment">// which accompanies this distribution, and is available</span>
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<a name="l00006"></a>00006 <span class="comment">// at the URL &quot;http://www.eclipse.org/legal/epl-v10.html&quot;.</span>
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<a name="l00007"></a>00007 <span class="comment">//</span>
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<a name="l00008"></a>00008 <span class="comment">// Initial Contributors:</span>
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<a name="l00009"></a>00009 <span class="comment">// Nokia Corporation - initial contribution.</span>
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<a name="l00010"></a>00010 <span class="comment">//</span>
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<a name="l00011"></a>00011 <span class="comment">// Contributors:</span>
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<a name="l00012"></a>00012 <span class="comment">//</span>
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<a name="l00013"></a>00013 <span class="comment">// Description:</span>
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<a name="l00014"></a>00014 <span class="comment">// Show asynchronous programming (without active objects)</span>
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<a name="l00015"></a>00015 <span class="comment">// Example introduces the &quot;complications&quot; involved in real-life</span>
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<a name="l00016"></a>00016 <span class="comment">// wait loops, which always deal with multiple asynchronous</span>
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<a name="l00017"></a>00017 <span class="comment">// service providers</span>
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<a name="l00018"></a>00018 <span class="comment">//</span>
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<a name="l00019"></a>00019
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<a name="l00020"></a>00020
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<a name="l00021"></a>00021
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<a name="l00022"></a>00022
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<a name="l00023"></a>00023 <span class="preprocessor">#include &quot;CommonFramework.h&quot;</span>
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<a name="l00024"></a>00024 <span class="preprocessor">#include &lt;e32math.h&gt;</span>
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<a name="l00025"></a>00025
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<a name="l00026"></a>00026 <span class="comment">//</span>
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<a name="l00027"></a>00027 <span class="comment">// Common literal text</span>
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<a name="l00028"></a>00028 <span class="comment">//</span>
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<a name="l00029"></a>00029
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<a name="l00030"></a>00030 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KMsgQuickCancelled,<span class="stringliteral">&quot;Quick service request canceled\n&quot;</span>);
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<a name="l00031"></a>00031
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<a name="l00032"></a>00032 <span class="comment">//</span>
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<a name="l00033"></a>00033 <span class="comment">// utility functions</span>
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<a name="l00034"></a>00034 <span class="comment">//</span>
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<a name="l00035"></a>00035
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<a name="l00036"></a>00036 LOCAL_D TInt64 smallRandSeed;
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<a name="l00037"></a>00037
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<a name="l00038"></a>00038 LOCAL_C TInt smallRand()
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<a name="l00039"></a>00039         {
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<a name="l00040"></a>00040           <span class="comment">// produce small random numbers in range 0..9</span>
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<a name="l00041"></a>00041         TInt bigResult=Math::Rand(smallRandSeed);<span class="comment">// result uses full 32-bit range</span>
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<a name="l00042"></a>00042         <span class="keywordflow">return</span> bigResult % 10;                   <span class="comment">// return result mod 10</span>
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<a name="l00043"></a>00043         }
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<a name="l00044"></a>00044
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<a name="l00045"></a>00045 LOCAL_C <span class="keywordtype">void</span> sleep(TInt aTenths)
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<a name="l00046"></a>00046         {
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<a name="l00047"></a>00047           <span class="comment">// sleep for an interval measured in tenths of a second</span>
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<a name="l00048"></a>00048         User::After(aTenths*100000); <span class="comment">// just let the User function do it for us</span>
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<a name="l00049"></a>00049         }
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<a name="l00050"></a>00050
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<a name="l00051"></a>00051
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<a name="l00052"></a>00052 <span class="comment">// Do the example</span>
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<a name="l00053"></a>00053 LOCAL_C <span class="keywordtype">void</span> doExampleL()
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<a name="l00054"></a>00054     {
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<a name="l00055"></a>00055           <span class="comment">// create and initialize heartbeat timer</span>
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<a name="l00056"></a>00056         RTimer heartbeat;               <span class="comment">// Heartbeat timer.</span>
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<a name="l00057"></a>00057         TRequestStatus heartbeatStatus; <span class="comment">// Request status associated with it.</span>
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<a name="l00058"></a>00058         heartbeat.CreateLocal();        <span class="comment">// Always created for this thread.</span>
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<a name="l00059"></a>00059
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<a name="l00060"></a>00060           <span class="comment">// create stuff for secondary timer</span>
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<a name="l00061"></a>00061         RTimer quickService;                    <span class="comment">// A quick service.</span>
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<a name="l00062"></a>00062         TRequestStatus quickServiceStatus;      <span class="comment">// Ccorresponding status.</span>
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<a name="l00063"></a>00063         TBool quickServiceRequestIssued=EFalse; <span class="comment">// Whether request issued.</span>
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<a name="l00064"></a>00064         quickService.CreateLocal();             <span class="comment">// Create timer.</span>
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<a name="l00065"></a>00065
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<a name="l00066"></a>00066           <span class="comment">// issue first heartbeat request</span>
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<a name="l00067"></a>00067         heartbeat.After(heartbeatStatus,1000000); <span class="comment">// Request completion</span>
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<a name="l00068"></a>00068                                                   <span class="comment">// after 1 second.</span>
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<a name="l00069"></a>00069         TInt heartbeatTick=0;                     <span class="comment">// Ccounts heartbeat ticks.</span>
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<a name="l00070"></a>00070
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<a name="l00071"></a>00071           <span class="comment">// wait loop</span>
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<a name="l00072"></a>00072         <span class="keywordflow">for</span> (;;)
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<a name="l00073"></a>00073                 {
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<a name="l00074"></a>00074                   <span class="comment">// Wait for any request</span>
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<a name="l00075"></a>00075                 User::WaitForAnyRequest();
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<a name="l00076"></a>00076                   <span class="comment">// find out which request completed, and handle it</span>
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<a name="l00077"></a>00077                 <span class="keywordflow">if</span> (heartbeatStatus!=KRequestPending)
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<a name="l00078"></a>00078                         {
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<a name="l00079"></a>00079                           <span class="comment">// heartbeat completed so service request</span>
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<a name="l00080"></a>00080                         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KMsgServicing,<span class="stringliteral">&quot;Servicing heartbeat tick %d ...\n&quot;</span>);
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<a name="l00081"></a>00081                         console-&gt;Printf(KMsgServicing,heartbeatTick);
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<a name="l00082"></a>00082                           <span class="comment">// take some time over it</span>
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<a name="l00083"></a>00083                         sleep(smallRand());
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<a name="l00084"></a>00084
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<a name="l00085"></a>00085                         <span class="keywordflow">if</span> (smallRand() &lt; 5)
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<a name="l00086"></a>00086                                 {
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<a name="l00087"></a>00087                                   <span class="comment">// issue a quick request 50% of the time</span>
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<a name="l00088"></a>00088                                   <span class="comment">// cancel any outstanding quick request</span>
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<a name="l00089"></a>00089                                 <span class="keywordflow">if</span> (quickServiceRequestIssued)
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<a name="l00090"></a>00090                                         {
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<a name="l00091"></a>00091                                         quickService.Cancel();            <span class="comment">// cancel request</span>
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<a name="l00092"></a>00092                                         User::WaitForRequest(quickServiceStatus); <span class="comment">// wait</span>
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<a name="l00093"></a>00093                                         quickServiceRequestIssued=EFalse; <span class="comment">// indicate not issued</span>
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<a name="l00094"></a>00094                                         console-&gt;Printf(KMsgQuickCancelled);
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<a name="l00095"></a>00095                                         }
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<a name="l00096"></a>00096                                   <span class="comment">// issue new quick request</span>
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<a name="l00097"></a>00097                                 quickService.After(quickServiceStatus,(smallRand()*2)*100000);
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<a name="l00098"></a>00098                                   <span class="comment">// request an event after 0 .. 1.8 seconds</span>
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<a name="l00099"></a>00099                                 quickServiceRequestIssued=ETrue; <span class="comment">// indicate request issued</span>
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<a name="l00100"></a>00100                                 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KMsgQuickIssued,<span class="stringliteral">&quot;Quick service request issued\n&quot;</span>);
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<a name="l00101"></a>00101                                 console-&gt;Printf(KMsgQuickIssued);
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<a name="l00102"></a>00102                                 }
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<a name="l00103"></a>00103
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<a name="l00104"></a>00104                         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KMsgServiced,<span class="stringliteral">&quot;... heartbeat tick %d serviced\n&quot;</span>);
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<a name="l00105"></a>00105                         console-&gt;Printf(KMsgServiced, heartbeatTick);
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<a name="l00106"></a>00106                           <span class="comment">// test whether processing should finish</span>
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<a name="l00107"></a>00107                         <span class="keywordflow">if</span> (heartbeatTick &gt;= 10)
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<a name="l00108"></a>00108                                 {
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<a name="l00109"></a>00109                                   <span class="comment">// 10 heart-beats: processing finished</span>
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<a name="l00110"></a>00110                                 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KMsgFinishing,<span class="stringliteral">&quot;Finishing\n&quot;</span>);
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<a name="l00111"></a>00111                                 console-&gt;Printf(KMsgFinishing);
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<a name="l00112"></a>00112
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<a name="l00113"></a>00113                                   <span class="comment">// cancel quick request, if outstanding</span>
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<a name="l00114"></a>00114                                 <span class="keywordflow">if</span> (quickServiceRequestIssued)
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<a name="l00115"></a>00115                                         {
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<a name="l00116"></a>00116                                           <span class="comment">// only relevant if request issued</span>
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<a name="l00117"></a>00117                                         quickService.Cancel(); <span class="comment">// request early completion</span>
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<a name="l00118"></a>00118                                         User::WaitForRequest(quickServiceStatus); <span class="comment">// wait</span>
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<a name="l00119"></a>00119                                         quickServiceRequestIssued=EFalse;
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<a name="l00120"></a>00120                                           <span class="comment">// request no longer issued</span>
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<a name="l00121"></a>00121                                         console-&gt;Printf(KMsgQuickCancelled);
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<a name="l00122"></a>00122                                         }
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<a name="l00123"></a>00123
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<a name="l00124"></a>00124                                 <span class="keywordflow">break</span>; <span class="comment">// finish wait loop</span>
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<a name="l00125"></a>00125                                 }
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<a name="l00126"></a>00126                           <span class="comment">// re-issue request</span>
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<a name="l00127"></a>00127                         heartbeatTick++; <span class="comment">// increment tick counter</span>
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<a name="l00128"></a>00128                         heartbeat.After(heartbeatStatus,1000000); <span class="comment">// another second</span>
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<a name="l00129"></a>00129                         }
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<a name="l00130"></a>00130
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<a name="l00131"></a>00131                 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (quickServiceRequestIssued &amp;&amp; quickServiceStatus!=KRequestPending)
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<a name="l00132"></a>00132                         { <span class="comment">// if quick service request issued, and completed, then service it</span>
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<a name="l00133"></a>00133                         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KMsgQuickCompleted,<span class="stringliteral">&quot;Quick request completed\n&quot;</span>);
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<a name="l00134"></a>00134                         console-&gt;Printf(KMsgQuickCompleted);
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<a name="l00135"></a>00135                         quickServiceRequestIssued=EFalse; <span class="comment">// indicate request not issued</span>
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<a name="l00136"></a>00136                         }
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<a name="l00137"></a>00137
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<a name="l00138"></a>00138                 <span class="keywordflow">else</span>
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<a name="l00139"></a>00139                         { <span class="comment">// stray signal</span>
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<a name="l00140"></a>00140                         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KMsgStraySignal,<span class="stringliteral">&quot;Stray signal\n&quot;</span>);
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<a name="l00141"></a>00141                         User::Panic(KMsgStraySignal, 1); <span class="comment">// panic!</span>
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<a name="l00142"></a>00142                         }
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<a name="l00143"></a>00143                 }
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<a name="l00144"></a>00144
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<a name="l00145"></a>00145         <span class="comment">// close quick service</span>
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<a name="l00146"></a>00146         quickService.Close(); <span class="comment">// close</span>
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<a name="l00147"></a>00147
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<a name="l00148"></a>00148         <span class="comment">// close timer</span>
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<a name="l00149"></a>00149         heartbeat.Close(); <span class="comment">// close timer</span>
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<a name="l00150"></a>00150         }
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</pre></div></div>
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<hr size="1"/><address style="text-align: right;"><small>Generated by&nbsp;
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<a href="http://www.doxygen.org/index.html">
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<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.2 </small></address>
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</body>
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</html>
MCL/sftools/depl/docscontent