author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Thu, 21 Jan 2010 18:18:20 +0000 | |
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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_d0e205732_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_d0e205743_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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</conbody></concept> |