author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Wed, 31 Mar 2010 11:11:55 +0100 | |
changeset 7 | 51a74ef9ed63 |
child 8 | ae94777fff8f |
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 task |
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PUBLIC "-//OASIS//DTD DITA Task//EN" "task.dtd"> |
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<task id="GUID-0185D5DC-5142-42C3-8FFB-8EB76D49AB06" xml:lang="en"><title>Requesting |
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RAM Synchronously</title><shortdesc>This section describes how an application can request for free |
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RAM synchronously.</shortdesc><prolog><metadata><keywords/></metadata></prolog><taskbody> |
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<prereq id="GUID-CCF15EAF-F053-4968-AF9F-F9D0345F9F36"><p>Perform the steps |
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described in <xref href="GUID-50CA5439-29A1-426C-83BA-EC048FE86CDE.dita">Allowing |
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Large Memory Allocation</xref>.</p></prereq> |
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<context id="GUID-BFCBBCAE-9FD9-4549-86E9-48294E896D32"> <p>Requesting |
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free RAM synchronously is easy to implement because no active object is needed |
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and is recommended when there is no need to perform any other task while waiting |
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for the request to complete. This approach is not recommended in case of a |
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server, as synchronous call blocks the server and it cannot serve its clients |
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during synchronous wait.</p> </context> |
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<steps id="GUID-4DD07DEC-6017-4237-BE46-1D69E5FBD744-GENID-1-8-1-10-1-1-8-1-5-1-6-1-6-1-6-1-3-3"> |
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<step id="GUID-9A69E5AD-E938-4092-A8C2-CB65C37C8962-GENID-1-8-1-10-1-1-8-1-5-1-6-1-6-1-6-1-3-3-1"><cmd>Request free memory.</cmd> |
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<info> <codeblock xml:space="preserve">User::LeaveIfError(iOomMonitorSession.RequestFreeMemory(KLargeValueToAllocate)); |
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DoFunctionRequiring_KLargeValueToAllocate_Bytes();</codeblock> </info> |
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</step> |
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</steps> |
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<example><p>The following code snippet illustrates an synchronous request |
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for 2MB RAM: </p><codeblock xml:space="preserve">TInt KLargeValueToAllocate = 2097152; //2MB |
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// Create an OOM Monitor session |
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ROomMonitorSession oomMonitorSession; |
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CleanUpClosePushL(oomMonitorSession); |
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User::LeaveIfError(oomMonitorSession.Connect()); |
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// Request free memory |
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User::LeaveIfError(iOomMonitorSession.RequestFreeMemory(KLargeValueToAllocate)); |
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DoFunctionRequiring_KLargeValueToAllocate_Bytes(); |
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// Tidy up |
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CleanupStack::PopAndDestroy(); //oomMonitorSession, calls Close() |
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</codeblock></example> |
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</taskbody><related-links> |
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<link href="GUID-CE308C71-D8B2-43B3-97FD-B868285ED5FB.dita"><linktext>OOM Monitor |
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Priority</linktext></link> |
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<link href="GUID-39A8FBC9-5FD6-4F92-B71E-5C5438ECFD46.dita"><linktext>OOM Monitor |
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Overview</linktext></link> |
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<link href="GUID-88752800-83BD-4845-80A0-6B65D8D81924.dita"><linktext>OOM Monitor |
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Reference</linktext></link> |
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</related-links></task> |