Symbian3/SDK/Source/GUID-5FBA9BB1-94A2-470C-9932-C4255E3774C0.dita
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-5FBA9BB1-94A2-470C-9932-C4255E3774C0" xml:lang="en"><title>Shared
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Memory between Threads</title><shortdesc>This document describes the shared memory between threads and how
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to avoid race conditions.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>Shared memory is a method of InterProcess Communication (IPC) where a single
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chunk of memory is shared between two or more processes. It is used to communicate
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between threads within a process or two unrelated processes, allowing both
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to share a given region of memory efficiently. In an SMP system, multiple
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cores are running threads at the same time and not just virtually as in unicore.
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Extra caution is needed to handle memory that shared between multiple threads.</p>
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<p>A thread is the unit of execution within a process. Every time a process
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is initialized, a primary thread is created. For many applications the primary
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thread is the only one that the application requires, however, processes can
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create additional threads. In an SMP system, multiple threads can be executing
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the same (shared) functions simultaneously. Therefore functions need to deal
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with this situation in order to maintain consistency of the system.</p>
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<p>Following are the key concepts to synchronize threads:</p>
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<ul>
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<li><p><b>Mutexes</b> are used to serialize access to a section of re-entrant
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code that cannot be executed concurrently by more than one thread. A mutex
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object only allows one thread into a controlled section, forcing other threads
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which attempt to gain access to that section to wait until the first thread
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has exited from that section. A mutex can be used by threads across any number
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of processes. If a resource is only shared between the threads within the
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same process, it can be more efficient to use a critical section.</p></li>
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</ul>
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<ul>
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<li><p><b>Semaphores</b> restrict the number of simultaneous users of a shared
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resource up to a maximum number. Threads can request access to the resource
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(decrementing the semaphore), and can signal that they have finished using
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the resource (incrementing the semaphore). A thread that requests access to
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a busy resource is put in a waiting state. The semaphore maintains a First
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In First Out (FIFO) queue of such waiting threads. When another thread increments
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the semaphore, the first thread in this queue is resumed.</p></li>
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</ul>
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<ul>
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<li><p><b>Locks</b> are used to synchronize the data between threads in the
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kernel. In SMP, threads are executed in parallel, which means that if locks
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are not applied to the code it could result in a race condition. Race conditions
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lead to system crashes and data corruptions. For more information about locking,
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see <xref href="GUID-16AED228-539F-4BF7-A7FD-9A01FF1A9A84.dita">Locking</xref>.</p></li>
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</ul>
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<p>Shared memory between threads is provided by the following APIs:<table id="GUID-A35DFE73-AE8C-42A9-A76F-4D47B6BAD6EB">
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<tgroup cols="2"><colspec colname="col1"/><colspec colname="col2"/>
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<thead>
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<row>
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<entry valign="top"><p>API name</p></entry>
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<entry valign="top"><p>Description</p></entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><p><xref href="GUID-29F27759-CC53-36DF-AE92-623F061D6C96.dita"><apiname>TFindThread</apiname></xref></p></entry>
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<entry><p>Searches for threads by pattern matching against the names of thread
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objects.</p></entry>
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</row>
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<row>
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<entry><p><xref href="GUID-B0E661BC-4058-3256-B9C3-5A4FD52F6DE5.dita"><apiname>RThread</apiname></xref></p></entry>
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<entry><p>A handle to a thread. </p></entry>
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</row>
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<row>
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<entry><p><xref href="GUID-C0FEA3A0-7DD3-3B87-A919-CB973BC05766.dita"><apiname>RMutex</apiname></xref></p></entry>
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<entry><p>A handle to a mutex.</p></entry>
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<entry><p><xref href="GUID-A907C7B1-BD90-3E8F-AEA8-5A634BC98D0D.dita"><apiname>TFindMutex</apiname></xref></p></entry>
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<entry><p>Finds all global mutexes whose full names match a specified pattern.</p></entry>
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<entry><p><xref href="GUID-AED27A76-3645-3A04-B80D-10473D9C5A27.dita"><apiname>RSemaphore</apiname></xref></p></entry>
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<entry><p>A handle to a semaphore.</p></entry>
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<entry><p><xref href="GUID-F3ACDC41-31EE-3C32-BE2C-D696B84931CD.dita"><apiname>TFindSemaphore</apiname></xref></p></entry>
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<entry><p>Finds all global semaphores whose full names match a specified pattern.</p></entry>
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</tbody>
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</tgroup>
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</table></p>
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</conbody><related-links>
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<link href="GUID-547CF71C-6A62-57C0-A9BE-E76B4286C6D6.dita"><linktext>Threads And
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Processes Overview</linktext></link>
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<link href="GUID-BA89F4DF-E2F6-5E0B-BF20-F8898FC5D5F8.dita"><linktext>Mutexes Overview</linktext>
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</link>
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<link href="GUID-E865E677-1219-500C-89CF-0A2835B91834.dita"><linktext>Semaphores
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Overview</linktext></link>
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</related-links></concept>