Symbian3/SDK/Source/GUID-D62A0234-348C-5553-B8C0-7B483AF9D50C.dita
author Dominic Pinkman <dominic.pinkman@nokia.com>
Tue, 20 Jul 2010 12:00:49 +0100
changeset 13 48780e181b38
parent 8 ae94777fff8f
permissions -rw-r--r--
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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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-D62A0234-348C-5553-B8C0-7B483AF9D50C" xml:lang="en"><title>Thread-relative
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and Process-relative handles</title><shortdesc>This document describes the difference between thread-relative
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and process-relative handles.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>This is the issue of handle ownership.</p>
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<p>Threads and processes each maintain a list of objects to which they refer.
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This list is an object index and is the way in which handle-numbers representing
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these objects are generated.</p>
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<p>When user code causes a Kernel object (e.g. a mutex) to be created, ownership
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of the handle which is opened on that object may be vested either in the thread
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or the process. If ownership is vested in the thread, the handle associated
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with that object is said to be <i>thread-relative</i>, conversely, if ownership
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is vested in the process, the handle associated with that object is said to
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be<i>process-relative</i>.</p>
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<p>The following diagram shows the case where code belonging to thread A creates
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a mutex and vests ownership of the handle in the thread. </p>
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<fig id="GUID-5A22F71B-C146-53A9-B8A4-51D79D4EF668">
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<title>Thread-relative handle</title>
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<image href="GUID-7B589949-2784-5B77-959E-99F8733A8853_d0e235592_href.png" placement="inline"/>
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</fig>
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<p>Compare with the following case where ownership of the mutex handle is
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vested in the process.</p>
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<fig id="GUID-6C60BB64-AE7B-5B46-983B-D6D65D8AB41C">
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<title>Process-relative handle</title>
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<image href="GUID-47511301-DFF9-52B0-9602-DD9D293D3044_d0e235603_href.png" placement="inline"/>
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</fig>
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<p>In both cases, the mutex object is added to the appropriate Kernel container
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which can be considered as the owner of the object.</p>
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<p>The significance of a process-relative handle is that any thread in the
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process can use that handle to access the Kernel side object that the handle
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represents. In contrast, a thread-relative handle can only be used by the
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thread creating it; other threads in that process can only access the Kernel
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side object by <xref href="GUID-A4799558-AF8C-5E97-9B03-7D1C04FEC243.dita">duplicating</xref> that
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handle.</p>
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<p>For a thread-relative handle, the associated Kernel side object is closed
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if the thread dies. For a process-relative handle, the Kernel side object
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is closed if the process dies. Such an object is not closed if any thread
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belonging to that process dies; the object remains in existence for the lifetime
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of the process, or until all references to it have been explicitly closed.</p>
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<p>See also:</p>
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<ul>
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<li id="GUID-7355DCEE-85E8-58C6-9102-CBCE93251098"><p><xref href="GUID-A95CDFDE-285F-5DE2-AADE-29B2B9663757.dita">The
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object index</xref> </p> </li>
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</ul>
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51a74ef9ed63 Week 12 contribution of API Specs and fix SDK submission
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</conbody></concept>