<?xml version="1.0" encoding="utf-8"?>

<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->

<!-- This component and the accompanying materials are made available under the terms of the License 

"Eclipse Public License v1.0" which accompanies this distribution, 

and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->

<!-- Initial Contributors:

    Nokia Corporation - initial contribution.

Contributors: 

-->

<!DOCTYPE concept

  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

<concept id="GUID-38BE7105-309E-5372-98EE-BCA0ADD0ACBA" xml:lang="en"><title>Hybrid

Applications</title><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>P.I.P.S. applications can be written either as pure C or as hybrid applications

which mix native Symbian C++ and Standard C. In addition to the core P.I.P.S.

libraries, an application can also use P.I.P.S. extensions or third-party

C shared libraries. Hybrid applications can also link against native Symbian

platform libraries. </p>

<p>The use cases for hybrid applications are as follows: </p>

<ul>

<li id="GUID-2FDE4170-7A71-5047-BC65-5089DB717746"><p>Native Symbian <codeph>EXE</codeph> using

both Standard C and native Symbian platform C++ APIs </p> </li>

<li id="GUID-8D102C96-50B5-51B1-884B-76F9646D7BBF"><p> <codeph>STDEXE</codeph> using

both Standard C and native Symbian platform C++ APIs </p> </li>

<li id="GUID-240056C6-0296-5C1C-BCB1-281E28F30841"><p>Native Symbian <codeph>EXE</codeph> depending

on an <codeph>STDDLL</codeph> which uses Standard C APIs </p> </li>

<li id="GUID-8CB831F1-FDB3-5B60-9652-3C2552B1D07C"><p> <codeph>STDEXE</codeph> using

a native Symbian <codeph>DLL</codeph> which uses native Symbian platform C++

APIs </p> </li>

<li id="GUID-CDA31C5D-0FB0-532D-801F-0E365DD92E6D"><p> <codeph>STDDLL</codeph> using

both Standard C and native Symbian platform C++ APIs </p> </li>

<li id="GUID-5BB61F60-82AE-580C-82CB-AAADF30B3E75"><p>Native Symbian <codeph>DLL</codeph> using

both Standard C and native Symbian platform C++ APIs </p> </li>

</ul>

<section id="GUID-CC6F2464-A914-4358-8AA6-929E2E41CDAC"><title>Threads and

hybrid applications</title> <p>The <codeph>pthread</codeph> and <xref href="GUID-B0E661BC-4058-3256-B9C3-5A4FD52F6DE5.dita"><apiname>RThread</apiname></xref> APIs

do not mix. Symbian platform heaps are managed thread-wise whereas P.I.P.S.

heaps are managed process-wise. Mixing <codeph>pthread</codeph> and <codeph>RThread</codeph> <i>may</i> result

in panics due to data being lost or orphaned. So, do not mix the two unless

you know what you're doing. </p> <p>User libraries or executables

written using P.I.P.S. must not allocate resources in the context of the calling

thread as the thread might be using a private heap which is inaccessible to

other threads and might have a different lifetime. </p> <p>To minimise the

risks avoid using <codeph>RThread</codeph> APIs in primarily POSIX applications

or libraries (those entering via <codeph>main()</codeph>), and avoid using <codeph>pthread</codeph> in

primarily Symbian platform applications or libraries (those entering via <codeph>E32Main()</codeph>). </p> </section>