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1 <?xml version="1.0" encoding="utf-8"?> |
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2 <!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
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3 <!-- This component and the accompanying materials are made available under the terms of the License |
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4 "Eclipse Public License v1.0" which accompanies this distribution, |
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5 and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
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6 <!-- Initial Contributors: |
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7 Nokia Corporation - initial contribution. |
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8 Contributors: |
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9 --> |
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10 <!DOCTYPE task |
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11 PUBLIC "-//OASIS//DTD DITA Task//EN" "task.dtd"> |
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12 <task id="GUID-50CA5439-29A1-426C-83BA-EC048FE86CDE" xml:lang="en"><title>Allowing |
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13 Large Memory Allocation</title><shortdesc>This section describes how an application can request for free |
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14 memory from OOM Monitor for large amount of RAM allocation.</shortdesc><prolog><metadata><keywords/></metadata></prolog><taskbody> |
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15 <context id="GUID-54D945B5-EFE2-4639-B040-7A6321448A07"> <p>An application |
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16 can allocate RAM without seeking the permission from the OOM Monitor if the |
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17 amount of RAM is not over <xref href="GUID-75DB7CA6-08F0-3CFB-ADDF-621FFF5B8058.dita"><apiname>KOomMaxAllocationWithoutPermission</apiname></xref> limit. |
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18 </p><p>If an application needs to allocate more RAM than allocated by <xref href="GUID-75DB7CA6-08F0-3CFB-ADDF-621FFF5B8058.dita"><apiname>KOomMaxAllocationWithoutPermission</apiname></xref>, |
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19 it must request the OOM Monitor using the <xref href="GUID-02D1911A-D2E5-3D28-9B05-75DA0A75DE73.dita#GUID-02D1911A-D2E5-3D28-9B05-75DA0A75DE73/GUID-BE322080-5193-3D8E-9425-C6BEA920ED2E"><apiname>ROomMonitorSession::RequestFreeMemory()</apiname></xref> method. </p><p>An |
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20 application can request for free RAM either synchronously or asynchronously.</p> |
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21 </context> |
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22 <steps id="GUID-4DD07DEC-6017-4237-BE46-1D69E5FBD744-GENID-1-10-1-11-1-1-9-1-5-1-6-1-6-1-3-2"> |
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23 <step id="GUID-83631E4F-71D0-4FD2-8FD6-46689AAFA761-GENID-1-10-1-11-1-1-9-1-5-1-6-1-6-1-3-2-1"><cmd>Create an OOM Monitor |
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24 session</cmd> |
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25 <info><codeblock xml:space="preserve">ROomMonitorSession ioomMonitorSession; |
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26 CleanUpClosePushL(ioomMonitorSession); |
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27 User::LeaveIfError(ioomMonitorSession.Connect()); |
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28 </codeblock></info> |
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29 </step> |
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30 <step id="GUID-83631E4F-71D0-4FD2-8FD6-46689AAFA761-GENID-1-10-1-11-1-1-9-1-5-1-6-1-6-1-3-2-2"><cmd>Request for free |
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31 memory can be done in two ways:</cmd> |
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32 </step> |
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33 </steps> |
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34 <result id="GUID-1D804A3D-8EEC-4E62-8496-2A43CCDC0BEB"><p>The OOM Monitor |
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35 allows the client application to allocate memory, if the free RAM level is |
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36 above the <codeph>LOW_RAM_THRESHOLD</codeph> value.</p><p> If the free RAM |
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37 level is below the <codeph>LOW_RAM_THRESHOLD</codeph> value, |
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38 the OOM Monitor releases RAM using <xref href="GUID-02D1911A-D2E5-3D28-9B05-75DA0A75DE73.dita#GUID-02D1911A-D2E5-3D28-9B05-75DA0A75DE73/GUID-BE322080-5193-3D8E-9425-C6BEA920ED2E"><apiname>ROomMonitorSession::RequestFreeMemory()</apiname></xref> method. |
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39 This method returns the following values: <ul> |
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40 <li><p>Requested amount of RAM is available then <codeph>aStatus</codeph> is |
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41 set to <codeph>KErrNone</codeph>.</p></li> |
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42 <li><p>Requested amount of RAM is not available then <codeph>aStatus</codeph> is |
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43 set to <codeph>KErrNoMemory</codeph>.</p></li> |
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44 </ul> </p></result> |
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45 </taskbody><related-links> |
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46 <link href="GUID-F6A33835-D677-41D0-86BB-812E3AFA5192.dita"><linktext>OOM Monitor |
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47 Concepts</linktext></link> |
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48 <link href="GUID-39A8FBC9-5FD6-4F92-B71E-5C5438ECFD46.dita"><linktext>OOM Monitor |
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49 Overview</linktext></link> |
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50 <link href="GUID-88752800-83BD-4845-80A0-6B65D8D81924.dita"><linktext>OOM Monitor |
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51 Reference</linktext></link> |
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52 </related-links></task> |