author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Thu, 11 Mar 2010 15:24:26 +0000 | |
changeset 2 | ebc84c812384 |
parent 0 | 89d6a7a84779 |
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 concept |
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PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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<concept id="GUID-AF07AD54-86F1-5DB7-80FF-633A559DA4BD" xml:lang="en"><title>Creating |
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Processes and Threads </title><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<section id="GUID-6E0A2832-98BA-54AF-B7A7-28DFFD5FEC76"><title>Introduction</title> <p>Process |
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creation on Unix-like machines is normally done in two stages. Firstly, <codeph>fork()</codeph> is |
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called. This creates a child process, which is a clone of the calling (parent) |
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process. The child process is identical (except for a few details) to the |
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parent. Secondly, a call to one of the <codeph>exec()</codeph> family functions |
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is invoked by the child which changes the program being executed by that process. |
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For more information about <codeph>fork()</codeph> or <codeph>exec()</codeph>, |
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see <xref href="http://www.opengroup.org" scope="external">Open Group</xref>. </p> <p>P.I.P.S. |
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does not support <codeph>fork()</codeph> and <codeph>exec()</codeph> and the |
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reasons for the same are described in the following sections. However, there |
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are industry standard alternatives supported by P.I.P.S. and are detailed |
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in the following sections: </p> <ul> |
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<li><p><xref href="GUID-ADB9AD91-37A2-4FE6-B378-C43CD0A7B513.dita">Alternatives |
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to <codeph>fork()</codeph> and <codeph>exec()</codeph> for creating child |
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processes</xref></p></li> |
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<li><p><xref href="GUID-545DA961-217E-49CA-A90E-7A41E2C03A99.dita">Forking without <codeph>exec()</codeph></xref></p></li> |
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<li><p><xref href="GUID-B58D282E-E6EC-4AE1-96DB-30A5FB850563.dita"><codeph>exec()</codeph> without |
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forking using <apiname>posix_spawn()</apiname></xref></p></li> |
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</ul> <p><b>Omission of fork()</b> </p> <p>A Unix-like kernel is designed |
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with the two stage process creation in mind. On the Symbian platform (and |
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Microsoft Windows®), the kernel was designed to create a process, which runs |
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a single executable, in a single step. </p> <p>P.I.P.S. does not implement |
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the <codeph>fork()</codeph> operation because this would require an entirely |
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new way of dealing with processes in the kernel and memory model. For example, |
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duplicating the address space of an existing process was not something that |
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was considered in the Symbian platform kernel's design. Symbian took this |
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decision as the effort involved in customising this feature would be more |
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than the benefit of providing the <codeph>fork()</codeph> function, especially |
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in the provision of Pthreads. For more information about Pthreads, see the <xref href="http://en.wikipedia.org/wiki/POSIX_Threads" scope="external">Pthread |
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Wikipage</xref>. </p> <p><b>Omission of exec()</b> </p> <p>On Unix-like systems, <codeph>exec()</codeph> is |
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the standard way to load a process image into memory. Only the initialisation |
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process is loaded directly into a new address space (special case code in |
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the kernel), all other processes are loaded into an existing address space |
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which was initially created by forking. </p> <p>On the Symbian |
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platform, the only way to load a process image into memory is using the loader. |
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It assumes that the image is being loaded as a new process - one that owns |
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no resources, has no open handles and so on. The change to the loader and |
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any associated kernel changes, to support the <codeph>exec()</codeph> function |
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were deemed to be too risky. </p> <p><b>Generic IPC</b> </p> <p>P.I.P.S. supports |
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two types of Inter-Process Communication (IPC) between processes or threads: </p> <ul> |
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<li><p> <b>Pipes (named and unnamed):</b> Unnamed pipes are created using <xref href="GUID-EC7F85FF-FD4E-324C-8D01-EF6F7E7A79FE.dita"><apiname>pipe()</apiname></xref> and |
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named pipes are created using <xref href="GUID-F4749DAA-1B29-3D1D-A3AA-0D52B851E501.dita"><apiname>mkfifo()</apiname></xref>. Pipe-based communication |
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is also possible between a parent and a child process when the child is created |
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using <xref href="GUID-A9DB6E7C-B8D6-377A-BBE6-39E0A7A09E5D.dita"><apiname>popen()</apiname></xref> or <xref href="GUID-A1E2E172-C4E4-30FB-99CF-E4140E31DF59.dita"><apiname>popen3()</apiname></xref>. </p></li> |
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<li><p> <b>Local file sockets:</b> These correspond to sockets created with <codeph>AF_LOCAL/PF_LOCAL/AF_UNIX</codeph> as |
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the address family. The semantics of their use are similar to those of their |
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Unix equivalents. </p></li> |
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</ul> </section> |
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</conbody><related-links> |
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<link href="GUID-6590B534-D976-5305-BE95-48DD05120DFB.dita#GUID-6590B534-D976-5305-BE95-48DD05120DFB/GUID-3CA8FF29-79B4-5D43-8A23-EDB136BF7A8F"> |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
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64 |
<linktext>One Definition Rule - warning</linktext></link> |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
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65 |
</related-links></concept> |