Gitiles
Code Review Sign In
gerrit-public.fairphone.software / platform / external / libxml2 / f85925628ac8b50c0a5339fccd861aedf46c2f00 / . / doc / threads.html
blob: 836db11bf28ccd66a839285355391fbf1c0e4ceb [file] [log] [blame]
Daniel Veillard43d3f612001-11-10 11:57:23 +0000[diff] [blame]1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
Daniel Veillard52dcab32001-10-30 12:51:17 +0000[diff] [blame]2<html>
3<head>
4<meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type">
5<style type="text/css"><!--
Daniel Veillard2c748c62002-01-16 15:37:50 +0000[diff] [blame]6TD {font-size: 14pt; font-family: Verdana,Arial,Helvetica}
7BODY {font-size: 14pt; font-family: Verdana,Arial,Helvetica; margin-top: 2em; margin-left: 0em; margin-right: 0em}
8H1 {font-size: 20pt; font-family: Verdana,Arial,Helvetica}
9H2 {font-size: 18pt; font-family: Verdana,Arial,Helvetica}
10H3 {font-size: 16pt; font-family: Verdana,Arial,Helvetica}
Daniel Veillard52dcab32001-10-30 12:51:17 +0000[diff] [blame]11A:link, A:visited, A:active { text-decoration: underline }
12--></style>
13<title>Thread safety</title>
14</head>
15<body bgcolor="#8b7765" text="#000000" link="#000000" vlink="#000000">
16<table border="0" width="100%" cellpadding="5" cellspacing="0" align="center"><tr>
17<td width="180">
18<a href="http://www.gnome.org/"><img src="smallfootonly.gif" alt="Gnome Logo"></a><a href="http://www.w3.org/Status"><img src="w3c.png" alt="W3C Logo"></a><a href="http://www.redhat.com/"><img src="redhat.gif" alt="Red Hat Logo"></a>
19</td>
20<td><table border="0" width="90%" cellpadding="2" cellspacing="0" align="center" bgcolor="#000000"><tr><td><table width="100%" border="0" cellspacing="1" cellpadding="3" bgcolor="#fffacd"><tr><td align="center">
21<h1>The XML C library for Gnome</h1>
22<h2>Thread safety</h2>
23</td></tr></table></td></tr></table></td>
24</tr></table>
25<table border="0" cellpadding="4" cellspacing="0" width="100%" align="center"><tr><td bgcolor="#8b7765"><table border="0" cellspacing="0" cellpadding="2" width="100%"><tr>
26<td valign="top" width="200" bgcolor="#8b7765"><table border="0" cellspacing="0" cellpadding="1" width="100%" bgcolor="#000000"><tr><td>
27<table width="100%" border="0" cellspacing="1" cellpadding="3">
28<tr><td colspan="1" bgcolor="#eecfa1" align="center"><center><b>Main Menu</b></center></td></tr>
Daniel Veillard8acca112002-01-21 09:52:27 +0000[diff] [blame]29<tr><td bgcolor="#fffacd"><ul>
Daniel Veillard52dcab32001-10-30 12:51:17 +0000[diff] [blame]30<li><a href="index.html">Home</a></li>
31<li><a href="intro.html">Introduction</a></li>
32<li><a href="FAQ.html">FAQ</a></li>
33<li><a href="docs.html">Documentation</a></li>
34<li><a href="bugs.html">Reporting bugs and getting help</a></li>
35<li><a href="help.html">How to help</a></li>
36<li><a href="downloads.html">Downloads</a></li>
37<li><a href="news.html">News</a></li>
Daniel Veillard7b602b42002-01-08 13:26:00 +0000[diff] [blame]38<li><a href="XMLinfo.html">XML</a></li>
Daniel Veillard52dcab32001-10-30 12:51:17 +0000[diff] [blame]39<li><a href="XSLT.html">XSLT</a></li>
40<li><a href="architecture.html">libxml architecture</a></li>
41<li><a href="tree.html">The tree output</a></li>
42<li><a href="interface.html">The SAX interface</a></li>
43<li><a href="xmldtd.html">Validation &amp; DTDs</a></li>
44<li><a href="xmlmem.html">Memory Management</a></li>
45<li><a href="encoding.html">Encodings support</a></li>
46<li><a href="xmlio.html">I/O Interfaces</a></li>
47<li><a href="catalog.html">Catalog support</a></li>
48<li><a href="library.html">The parser interfaces</a></li>
49<li><a href="entities.html">Entities or no entities</a></li>
50<li><a href="namespaces.html">Namespaces</a></li>
51<li><a href="upgrade.html">Upgrading 1.x code</a></li>
52<li><a href="threads.html">Thread safety</a></li>
53<li><a href="DOM.html">DOM Principles</a></li>
54<li><a href="example.html">A real example</a></li>
55<li><a href="contribs.html">Contributions</a></li>
56<li>
57<a href="xml.html">flat page</a>, <a href="site.xsl">stylesheet</a>
58</li>
59</ul></td></tr>
60</table>
61<table width="100%" border="0" cellspacing="1" cellpadding="3">
Daniel Veillard3bf65be2002-01-23 12:36:34 +0000[diff] [blame]62<tr><td colspan="1" bgcolor="#eecfa1" align="center"><center><b>API Indexes</b></center></td></tr>
63<tr><td bgcolor="#fffacd"><ul>
Daniel Veillardf8592562002-01-23 17:58:17 +0000[diff] [blame^]64<li><a href="APIchunk0.html">Alphabetic</a></li>
Daniel Veillard3bf65be2002-01-23 12:36:34 +0000[diff] [blame]65<li><a href="APIconstructors.html">Constructors</a></li>
66<li><a href="APIfunctions.html">Functions/Types</a></li>
67<li><a href="APIfiles.html">Modules</a></li>
68<li><a href="APIsymbols.html">Symbols</a></li>
69</ul></td></tr>
70</table>
71<table width="100%" border="0" cellspacing="1" cellpadding="3">
Daniel Veillard52dcab32001-10-30 12:51:17 +0000[diff] [blame]72<tr><td colspan="1" bgcolor="#eecfa1" align="center"><center><b>Related links</b></center></td></tr>
Daniel Veillard8acca112002-01-21 09:52:27 +0000[diff] [blame]73<tr><td bgcolor="#fffacd"><ul>
Daniel Veillard52dcab32001-10-30 12:51:17 +0000[diff] [blame]74<li><a href="http://mail.gnome.org/archives/xml/">Mail archive</a></li>
75<li><a href="http://xmlsoft.org/XSLT/">XSLT libxslt</a></li>
Daniel Veillard4a859202002-01-08 11:49:22 +0000[diff] [blame]76<li><a href="http://phd.cs.unibo.it/gdome2/">DOM gdome2</a></li>
Daniel Veillard52dcab32001-10-30 12:51:17 +0000[diff] [blame]77<li><a href="ftp://xmlsoft.org/">FTP</a></li>
78<li><a href="http://www.fh-frankfurt.de/~igor/projects/libxml/">Windows binaries</a></li>
Daniel Veillarddb9dfd92001-11-26 17:25:02 +0000[diff] [blame]79<li><a href="http://garypennington.net/libxml2/">Solaris binaries</a></li>
Daniel Veillard52dcab32001-10-30 12:51:17 +0000[diff] [blame]80<li><a href="http://bugzilla.gnome.org/buglist.cgi?product=libxml">Bug Tracker</a></li>
81</ul></td></tr>
82</table>
83</td></tr></table></td>
84<td valign="top" bgcolor="#8b7765"><table border="0" cellspacing="0" cellpadding="1" width="100%"><tr><td><table border="0" cellspacing="0" cellpadding="1" width="100%" bgcolor="#000000"><tr><td><table border="0" cellpadding="3" cellspacing="1" width="100%"><tr><td bgcolor="#fffacd">
85<p>Starting with 2.4.7, libxml makes provisions to ensure that concurent
86threads can safely work in parallel parsing different documents. There is
87however a couple of things to do to ensure it:</p>
88<ul>
89<li>configure the library accordingly using the --with-threads options</li>
90<li>call xmlInitParser() in the &quot;main&quot; thread before using any of the
91 libxml API (except possibly selecting a different memory allocator)</li>
92</ul>
93<p>Note that the thread safety cannot be ensured for multiple threads sharing
94the same document, the locking must be done at the application level, libxml
95exports a basic mutex and reentrant mutexes API in &lt;libxml/threads.h&gt;.
96The parts of the library checked for thread safety are:</p>
97<ul>
98<li>concurrent loading</li>
99<li>file access resolution</li>
100<li>catalog access</li>
101<li>catalog building</li>
102<li>entities lookup/accesses</li>
103<li>validation</li>
104<li>global variables per-thread override</li>
105<li>memory handling</li>
106</ul>
107<p>XPath is supposed to be thread safe now, but this wasn't tested
108seriously.</p>
109<p><a href="mailto:daniel@veillard.com">Daniel Veillard</a></p>
110</td></tr></table></td></tr></table></td></tr></table></td>
111</tr></table></td></tr></table>
112</body>
113</html>