author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Thu, 11 Mar 2010 15:24:26 +0000 | |
changeset 2 | ebc84c812384 |
parent 0 | 89d6a7a84779 |
permissions | -rw-r--r-- |
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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-B67DB652-A489-55C7-A3A2-D00C43BE161E" xml:lang="en"><title>How |
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to handle completed requests</title><shortdesc>This document describes how an active scheduler handles a completed |
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request.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p>When an asynchronous service provider signals completion of a request, |
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the active scheduler's wait completes. </p> |
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<p>The active scheduler scans those active objects whose active request flags |
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are set. The active objects are checked in priority order. It invokes the <codeph>RunL()</codeph> function |
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of the first active object whose request has completed. If there are no such |
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active objects then the signal cannot be identified and the active scheduler |
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raises a panic. </p> |
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<p>The <codeph>RunL()</codeph> function performs whatever processing is required |
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to complete the request, for example retrieving the results of the service |
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function and displaying them. It may also: </p> |
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<ul> |
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<li id="GUID-F3DBFA70-BDC7-5205-89B8-6FD52D60F7E6"><p>schedule another request, |
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for example, in a keyboard handler, a request for the next key press. </p> </li> |
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<li id="GUID-387D63C5-8A05-5281-B825-47673094F0CB"><p>terminate the active |
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scheduler by calling <xref href="GUID-B4C76104-EA1B-3FC3-A31E-86A976598171.dita#GUID-B4C76104-EA1B-3FC3-A31E-86A976598171/GUID-B59D1017-1D81-3D5E-B0A2-73FC9C06194B"><apiname>CActiveScheduler::Stop()</apiname></xref>. </p> </li> |
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</ul> |
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<p>If it is possible for the <codeph>RunL()</codeph> function to leave, then |
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the active object should implement the <codeph>RunError()</codeph> function. </p> |
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<p>The active scheduler traps any leave occurring in the <codeph>RunL()</codeph> function |
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and calls the active object's <codeph>RunError()</codeph> function, passing |
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it the leave code. <codeph>RunError()</codeph> has the opportunity to do appropriate |
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cleanup and, when complete, should return <codeph>KErrNone</codeph>. </p> |
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<p>If <codeph>RunError()</codeph> returns anything other than <codeph>KErrNone</codeph>, |
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then the <i>active scheduler</i>'s <codeph>Error()</codeph> function is called. |
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As the default implementation of <codeph>Error()</codeph> raises a panic, |
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then a <xref href="GUID-B4C76104-EA1B-3FC3-A31E-86A976598171.dita"><apiname>CActiveScheduler</apiname></xref> derived class <i>must</i> be defined |
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to implement a suitable <codeph>Error()</codeph> function. </p> |
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<p>It may be simpler to ensure that the active objects's <codeph>RunError()</codeph> function <i>always</i> returns <codeph>KErrNone</codeph>. </p> |
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</conbody></concept> |