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Daniel Veillard | 28fdf8b | 2011-03-07 08:12:39 +0800 | [diff] [blame] | 10 | </style><title>Thread safety</title></head><body bgcolor="#8b7765" text="#000000" link="#a06060" vlink="#000000"><table border="0" width="100%" cellpadding="5" cellspacing="0" align="center"><tr><td width="120"><a href="http://swpat.ffii.org/"><img src="epatents.png" alt="Action against software patents" /></a></td><td width="180"><a href="http://www.gnome.org/"><img src="gnome2.png" alt="Gnome2 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><div align="left"><a href="http://xmlsoft.org/"><img src="Libxml2-Logo-180x168.gif" alt="Made with Libxml2 Logo" /></a></div></td><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"><h1>The XML C parser and toolkit of Gnome</h1><h2>Thread safety</h2></td></tr></table></td></tr></table></td></tr></table><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><td valign="top" width="200" bgcolor="#8b7765"><table border="0" cellspacing="0" cellpadding="1" width="100%" bgcolor="#000000"><tr><td><table width="100%" border="0" cellspacing="1" cellpadding="3"><tr><td colspan="1" bgcolor="#eecfa1" align="center"><center><b>Developer Menu</b></center></td></tr><tr><td bgcolor="#fffacd"><form action="search.php" enctype="application/x-www-form-urlencoded" method="get"><input name="query" type="text" size="20" value="" /><input name="submit" type="submit" value="Search ..." /></form><ul><li><a href="index.html" style="font-weight:bold">Main Menu</a></li><li><a href="html/index.html" style="font-weight:bold">Reference Manual</a></li><li><a href="examples/index.html" 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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"><p>Starting with 2.4.7, libxml2 makes provisions to ensure that concurrent |
Daniel Veillard | f781dba | 2006-06-09 13:34:49 +0000 | [diff] [blame] | 11 | threads can safely work in parallel parsing different documents. There is |
Daniel Veillard | e38217a | 2013-05-10 15:40:13 +0800 | [diff] [blame] | 12 | however a couple of things to do to ensure it:</p><ul> |
| 13 | <li>configure the library accordingly using the --with-threads options</li> |
Daniel Veillard | f781dba | 2006-06-09 13:34:49 +0000 | [diff] [blame] | 14 | <li>call xmlInitParser() in the "main" thread before using any of the |
| 15 | libxml2 API (except possibly selecting a different memory allocator)</li> |
| 16 | </ul><p>Note that the thread safety cannot be ensured for multiple threads sharing |
| 17 | the same document, the locking must be done at the application level, libxml |
| 18 | exports a basic mutex and reentrant mutexes API in <libxml/threads.h>. |
Daniel Veillard | e38217a | 2013-05-10 15:40:13 +0800 | [diff] [blame] | 19 | The parts of the library checked for thread safety are:</p><ul> |
| 20 | <li>concurrent loading</li> |
Daniel Veillard | 0b28e88 | 2002-07-24 23:47:05 +0000 | [diff] [blame] | 21 | <li>file access resolution</li> |
| 22 | <li>catalog access</li> |
| 23 | <li>catalog building</li> |
| 24 | <li>entities lookup/accesses</li> |
| 25 | <li>validation</li> |
| 26 | <li>global variables per-thread override</li> |
| 27 | <li>memory handling</li> |
Daniel Veillard | 28fdf8b | 2011-03-07 08:12:39 +0800 | [diff] [blame] | 28 | </ul><p>XPath has been tested for threaded usage on non-modified document |
| 29 | for example when using libxslt, but make 100% sure the documents |
| 30 | are accessed read-only !</p><p><a href="bugs.html">Daniel Veillard</a></p></td></tr></table></td></tr></table></td></tr></table></td></tr></table></td></tr></table></body></html> |