Symbian3/SDK/Source/GUID-E7C41361-C0B9-5341-A864-B59770FB7C9B.dita
author Graeme Price <GRAEME.PRICE@NOKIA.COM>
Fri, 15 Oct 2010 14:32:18 +0100
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permissions -rw-r--r--
Initial contribution of the Adaptation Documentation.
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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 id="GUID-E7C41361-C0B9-5341-A864-B59770FB7C9B" xml:lang="en"><title>Supporting
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Writable Static Data in DLLs </title><prolog><metadata><keywords/></metadata></prolog><conbody>
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<section><title>Introduction</title> <p>Many UNIX programs rely
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on Writable Static Data (WSD) for data storage. Native Symbian platform applications
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have been developed without any support for WSD on an Emulator for dynamic
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link libraries. P.I.P.S. supports WSD and a complete implementation is available
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for target phones. The implementation of WSD on an Emulator, however, poses
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certain restrictions for dynamic link libraries. </p><p>A Symbian project's
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MMP file can specify the <codeph>EPOCALLOWDLLDATA</codeph> directive to enforce
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a rule that WSD should not be shared between processes. The P.I.P.S. <codeph>STDEXE</codeph>y
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target type sets this directive automatically. The rule imposes the restriction
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that only one process can load a DLL with WSD. P.I.P.S. provides a mechanism
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to avoid these restrictions. </p> </section>
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<section><title>A UNIX DLL with WSD</title><codeblock xml:space="preserve">int refCount = 0;
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int IncRefCount()
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{
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  //Increment the reference count
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  return ++refCount;
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}
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int DecRefCount()
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{
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  //Decrement the reference count
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  return --refCount;
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}
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</codeblock><p/></section>
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<section><title>A Symbian DLL with WSD</title><p>The UNIX code above will
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provide indeterminate results on a Symbian emulator. If the DLL had <codeph>EPOCALLOWDLLDATA</codeph> in
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its MMP file, then only one process would be able to use the reference counting
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functions. Without <codeph>EPOCALLOWDLLDATA</codeph>, the reference count
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would be global and not process specific. </p><p>The following code demonstrates
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the use of the <xref href="GUID-807C676B-5C46-328C-879C-A4FCB638A5B6.dita"><apiname>Pls()</apiname></xref> function (Process Local Storage),
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which is the P.I.P.S. WSD solution to the problem. </p><codeblock xml:space="preserve">#include &lt;pls.h&gt;
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#ifdef __WINSCW__
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//The next code will run only on the emulator
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//Put the global count into a structure
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struct DLLData
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{
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   int refCount;
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};
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//Define a way to access the structure
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//On the first call to this function, memory will be allocated with the specified
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//UID as an identifier and the Initialization function will be called
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//Subsequent calls to this function return the allocated memory
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struct DLLData* GetGlobals()
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{
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   return Pls&lt;DLLData&gt;(KDLLUid3, InitializeGlobals);
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}
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//Initialization function
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TInt InitializeGlobals(DLLData* aData)
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{
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   aData-&gt;refCount = 0;
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   return KErrNone;
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}
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//Access the refCount variable
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int&amp; get_refCount()
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{
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   return GetClobals()-&gt;refCount;
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}
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//Macro to replace the variable with our new method
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#define refCount get_refCount()
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#else
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//Target device code
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int refCount;
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#endif
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int IncRefCount()
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{
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  return ++refCount;
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}
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int DecRefCount()
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{
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  return --refCount;
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}
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</codeblock></section>
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</conbody></concept>