Symbian3/SDK/Source/GUID-B7B7F611-BCA0-498F-BEC1-16B276F680D5.dita
author Dominic Pinkman <Dominic.Pinkman@Nokia.com>
Wed, 31 Mar 2010 11:11:55 +0100
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permissions -rw-r--r--
Week 12 contribution of API Specs and fix SDK submission
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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-B7B7F611-BCA0-498F-BEC1-16B276F680D5" xml:lang="en"><title>Calling
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Symbian Asynchronous APIs in Applications</title><shortdesc/><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>When porting an P.I.P.S.-based C or C++ application on top of Symbian C++,
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the developer may need to make use of Symbian asynchronous APIs. If asynchronous
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APIs are made use of in an P.I.P.S. application, the application needs to
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wait for the completion of the asynchronous API. This can be done in two ways:
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 <ul>
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<li><p>Wait for the asynchronous request to complete. This can be achieved
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by making use of <codeph>User::WaitForRequest(iStatus)</codeph>; where <codeph>iStatus</codeph> is
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the <codeph>TRequestSemaphore</codeph> used by the asynchronous API. </p></li>
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<li><p>Call the asynchronous API in an active object, run an active scheduler,
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and let the active scheduler wait for the asynchronous operation to complete. </p></li>
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</ul></p>
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<p><b>The problems with these approaches are: </b></p>
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<p>The open source application would get blocked till the asynchronous operation
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completes in the first approach. In the second approach, the active scheduler
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would be running in a wait loop, checking for asynchronous API completion.
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Even in this case, the P.I.P.S. application would not be able to perform any
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other operations outside the active scheduler framework.</p>
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<p>The asynchronous APIs could be called in a separate process, and the P.I.P.S.
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application could communicate with this process by making use of the client/server
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framework of Symbian or by making use of other P.I.P.S. IPC mechanisms. However,
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making a different process for calling asynchronous APIs might pose a performance
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hit.</p>
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<p>One of the ways to solve these problems is to call the asynchronous APIs
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in a separate thread.</p>
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<p><b>Example:</b></p>
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<codeblock xml:space="preserve">class CActiveThread:  public CActive
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{
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public: 
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    enum TState
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    {
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    EInitialized = 0x0,
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    EDoFirst = 0x1,
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    EDoSecond = 0x2,
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    EDoThird = 0x4,
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    ECompleted = 0x8
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    };
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     // thread startup routine
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    static int StartMyThread(void* thisptr);
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    // leaving variant of the thread startup routine
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    static int StartMyThreadL(void* thisptr);
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    // Helper function to start the thread
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    void StartThread();    
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    // Do Function
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    void DoFunction(TState aState );      
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    // CActive Functions
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    void RunL();
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    void DoCancel();
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    // Constructors and destructor      
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    static CActiveThread* NewL(); 
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    CActiveThread ();
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    void ConstructL();
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    ~ CActiveThread();      
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private:    
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    // Active Scheduler
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    CActiveSchedulerWait *iWait;          
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    // Command/State
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    TInt iState;        	    
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    TRequestStatus iThreadExitWait;	    
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    // my thread handle
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    RThread iActiveThread;    	    
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    sem_t iSem;
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};
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</codeblock>
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<p>The <codeph>StartThread</codeph> member function of <xref href="GUID-7968C6B4-3247-335A-845B-3D196E2EB14C.dita"><apiname>CActiveThread</apiname></xref> creates
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the thread which runs the active scheduler. <codeph>StartMyThread</codeph> is
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the entry point function for the new thread that starts an active scheduler
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and sets up the clean up stack. To call an asynchronous function, <codeph>DoFunction()</codeph> needs
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to be called with the corresponding state. The parent thread signals the child
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thread using the child thread’s thread request semaphore. When the thread
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request semaphore is signaled, the child thread wakes up, calls the corresponding
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asynchronous API in <codeph>RunL()</codeph> based on the <codeph>iState</codeph> and
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again goes back to the active scheduler wait loop.  </p>
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<p>To synchronize between the parent thread and the child thread, a semaphore
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can be used as shown in the following code snippet. </p>
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<codeblock xml:space="preserve">CActiveThread* CActiveThread::NewL()
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{
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CActiveThread* self = new (ELeave) CActiveThread();
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self-&gt;ConstructL();
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return self;
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}
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CActiveThread::CActiveThread():CActive(EPriorityStandard),iState(EInitialized)
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{       
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}
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void CActiveThread::ConstructL()
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{  
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// semaphore for Synching
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sem_init(&amp;iSem,0,0);  
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}
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void CActiveThread::StartThread()
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{       
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//Create Thread 
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TInt err = iActiveThread.Create( KThreadName(),&amp;CActiveThread::StartMyThread, KDefaultStackSize, NULL, (TAny*)this );
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iActiveThread.Logon( iThreadExitWait );
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iActiveThread.Resume();
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sem_wait(&amp;iSem );    
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}
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int CActiveThread::StartMyThread( void* ptr )
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{
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CActiveScheduler* scheduler = new (ELeave) CActiveScheduler();
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CActiveScheduler::Install(scheduler);     
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CTrapCleanup* pCleanup = CTrapCleanup::New();
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TRAPD(err, StartMyThreadL(ptr));        
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}
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int CActiveThread::StartMyThreadL( void* ptr )
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{        
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CActiveThread *thisptr = (CActiveThread*)ptr;    
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CActiveScheduler::Add(thisptr);
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thisptr-&gt;iWait = new (ELeave) CActiveSchedulerWait();	    
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thisptr-&gt;iState = EInitialized;
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thisptr-&gt;iStatus = KRequestPending;
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thisptr-&gt;SetActive();
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sem_post( &amp;(thisptr-&gt;iSem ));    
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thisptr-&gt;iWait-&gt;Start();   
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}
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 void CActiveThread::RunL()
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 {
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 switch ( iState )
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     {
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     case  EDoFirst:
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     // Call 1st asynchronous function
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     break;
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     case EDoSecond:
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     // Call 2nd asynchronous function
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     break;
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     case EDoThird:
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     // Call 3rd asynchronous function
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     break;
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     case ECompleted:
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     iWait-&gt;AsyncStop();    
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     return;			
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     }
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iStatus = KRequestPending;
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SetActive();
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// wake up the waiting thread
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sem_post(&amp;iSem);
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}
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void CActiveThread::DoCancel()
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{    
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}
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void CActiveThread::DoFunction(TState aState )
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{
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iState = aState;
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TRequestStatus *reqPtr = &amp;iStatus;
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iActiveThread.RequestComplete( reqPtr, KErrNone );
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sem_wait(&amp;iSem);
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}    
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CActiveThread::~CActiveThread()
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{  
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if ( iState != EInitialized )
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    {
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    iState = ECompleted;
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    TRequestStatus *reqPtr = &amp;iStatus;	
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    iActiveThread.RequestComplete( reqPtr, KErrNone ); 
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    User::WaitForRequest( iThreadExitWait);
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    }    
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sem_destroy(&amp;iSem);
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}
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</codeblock>
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<p><b>Using <xref href="GUID-7968C6B4-3247-335A-845B-3D196E2EB14C.dita"><apiname>CActiveThread</apiname></xref>:</b></p>
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<codeblock xml:space="preserve">iMyAsyncIf = CActiveThread::NewL();   
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iMyAsyncIf-&gt;StartThread();    
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iMyAsyncIf-&gt;DoFunction(EDoFirst);
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</codeblock>
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<p><b>Limitations: </b></p>
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<p>In this approach, only the parent thread communicates with the child thread.
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There is no way for the child thread to communicate with the parent thread.
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 </p>
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</conbody></concept>