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<title>threads: interfaces for thread handling</title>
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<h2><span class="refentrytitle">threads</span></h2>
<p>threads - interfaces for thread handling</p>
<p>set of generic threading related routines should work with pthreads, Windows native or TLS threads </p>
<p>Author(s): Daniel Veillard </p>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<pre class="synopsis">typedef struct _xmlMutex <a href="#xmlMutex">xmlMutex</a>;
typedef <a href="libxml2-threads.html#xmlMutex">xmlMutex</a> * <a href="#xmlMutexPtr">xmlMutexPtr</a>;
typedef struct _xmlRMutex <a href="#xmlRMutex">xmlRMutex</a>;
typedef <a href="libxml2-threads.html#xmlRMutex">xmlRMutex</a> * <a href="#xmlRMutexPtr">xmlRMutexPtr</a>;
int	<a href="#xmlCheckThreadLocalStorage">xmlCheckThreadLocalStorage</a>	(void);
void	<a href="#xmlCleanupThreads">xmlCleanupThreads</a>		(void);
void	<a href="#xmlFreeMutex">xmlFreeMutex</a>			(<a href="libxml2-threads.html#xmlMutexPtr">xmlMutexPtr</a> tok);
void	<a href="#xmlFreeRMutex">xmlFreeRMutex</a>			(<a href="libxml2-threads.html#xmlRMutexPtr">xmlRMutexPtr</a> tok);
int	<a href="#xmlGetThreadId">xmlGetThreadId</a>			(void);
void	<a href="#xmlInitThreads">xmlInitThreads</a>			(void);
int	<a href="#xmlIsMainThread">xmlIsMainThread</a>			(void);
void	<a href="#xmlLockLibrary">xmlLockLibrary</a>			(void);
void	<a href="#xmlMutexLock">xmlMutexLock</a>			(<a href="libxml2-threads.html#xmlMutexPtr">xmlMutexPtr</a> tok);
void	<a href="#xmlMutexUnlock">xmlMutexUnlock</a>			(<a href="libxml2-threads.html#xmlMutexPtr">xmlMutexPtr</a> tok);
<a href="libxml2-threads.html#xmlMutexPtr">xmlMutexPtr</a>	<a href="#xmlNewMutex">xmlNewMutex</a>		(void);
<a href="libxml2-threads.html#xmlRMutexPtr">xmlRMutexPtr</a>	<a href="#xmlNewRMutex">xmlNewRMutex</a>		(void);
void	<a href="#xmlRMutexLock">xmlRMutexLock</a>			(<a href="libxml2-threads.html#xmlRMutexPtr">xmlRMutexPtr</a> tok);
void	<a href="#xmlRMutexUnlock">xmlRMutexUnlock</a>			(<a href="libxml2-threads.html#xmlRMutexPtr">xmlRMutexPtr</a> tok);
void	<a href="#xmlUnlockLibrary">xmlUnlockLibrary</a>		(void);
</pre>
</div>
<div class="refsect1" lang="en"><h2>Description</h2></div>
<div class="refsect1" lang="en">
<h2>Details</h2>
<div class="refsect2" lang="en">
<div class="refsect2" lang="en">
<h3>
<a name="xmlMutex">Structure </a>xmlMutex</h3>
<pre class="programlisting">struct _xmlMutex {
The content of this structure is not made public by the API.
} xmlMutex;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlMutexPtr">Typedef </a>xmlMutexPtr</h3>
<pre class="programlisting"><a href="libxml2-threads.html#xmlMutex">xmlMutex</a> * xmlMutexPtr;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlRMutex">Structure </a>xmlRMutex</h3>
<pre class="programlisting">struct _xmlRMutex {
The content of this structure is not made public by the API.
} xmlRMutex;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlRMutexPtr">Typedef </a>xmlRMutexPtr</h3>
<pre class="programlisting"><a href="libxml2-threads.html#xmlRMutex">xmlRMutex</a> * xmlRMutexPtr;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlCheckThreadLocalStorage"></a>xmlCheckThreadLocalStorage ()</h3>
<pre class="programlisting">int	xmlCheckThreadLocalStorage	(void)<br>
</pre>
<p>Check whether thread-local storage could be allocated. In cross-platform code running in multithreaded environments, this function should be called once in each thread before calling other library functions to make sure that thread-local storage was allocated properly.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody><tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>0 on success or -1 if a memory allocation failed. A failed allocation signals a typically fatal and irrecoverable out-of-memory situation. Don't call any library functions in this case. This function never fails if the library is compiled with support for thread-local storage. This function never fails for the "main" thread which is the first thread calling <a href="libxml2-parser.html#xmlInitParser">xmlInitParser</a>. Available since v2.12.0.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlCleanupThreads"></a>xmlCleanupThreads ()</h3>
<pre class="programlisting">void	xmlCleanupThreads		(void)<br>
</pre>
<p>DEPRECATED: This function is a no-op. Call <a href="libxml2-parser.html#xmlCleanupParser">xmlCleanupParser</a> to free global state but see the warnings there. <a href="libxml2-parser.html#xmlCleanupParser">xmlCleanupParser</a> should be only called once at program exit. In most cases, you don't have call cleanup functions at all.</p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlFreeMutex"></a>xmlFreeMutex ()</h3>
<pre class="programlisting">void	xmlFreeMutex			(<a href="libxml2-threads.html#xmlMutexPtr">xmlMutexPtr</a> tok)<br>
</pre>
<p>Free a mutex.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody><tr>
<td><span class="term"><i><tt>tok</tt></i>:</span></td>
<td>the simple mutex</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlFreeRMutex"></a>xmlFreeRMutex ()</h3>
<pre class="programlisting">void	xmlFreeRMutex			(<a href="libxml2-threads.html#xmlRMutexPtr">xmlRMutexPtr</a> tok)<br>
</pre>
<p>xmlRFreeMutex() is used to reclaim resources associated with a reentrant mutex.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody><tr>
<td><span class="term"><i><tt>tok</tt></i>:</span></td>
<td>the reentrant mutex</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlGetThreadId"></a>xmlGetThreadId ()</h3>
<pre class="programlisting">int	xmlGetThreadId			(void)<br>
</pre>
<p>DEPRECATED: Internal function, do not use. xmlGetThreadId() find the current thread ID number Note that this is likely to be broken on some platforms using pthreads as the specification doesn't mandate pthread_t to be an integer type</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody><tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the current thread ID number</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlInitThreads"></a>xmlInitThreads ()</h3>
<pre class="programlisting">void	xmlInitThreads			(void)<br>
</pre>
<p>DEPRECATED: Alias for <a href="libxml2-parser.html#xmlInitParser">xmlInitParser</a>.</p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlIsMainThread"></a>xmlIsMainThread ()</h3>
<pre class="programlisting">int	xmlIsMainThread			(void)<br>
</pre>
<p>DEPRECATED: Internal function, do not use. Check whether the current thread is the main thread.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody><tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>1 if the current thread is the main thread, 0 otherwise</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlLockLibrary"></a>xmlLockLibrary ()</h3>
<pre class="programlisting">void	xmlLockLibrary			(void)<br>
</pre>
<p>xmlLockLibrary() is used to take out a re-entrant lock on the libxml2 library.</p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlMutexLock"></a>xmlMutexLock ()</h3>
<pre class="programlisting">void	xmlMutexLock			(<a href="libxml2-threads.html#xmlMutexPtr">xmlMutexPtr</a> tok)<br>
</pre>
<p>xmlMutexLock() is used to lock a libxml2 token.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody><tr>
<td><span class="term"><i><tt>tok</tt></i>:</span></td>
<td>the simple mutex</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlMutexUnlock"></a>xmlMutexUnlock ()</h3>
<pre class="programlisting">void	xmlMutexUnlock			(<a href="libxml2-threads.html#xmlMutexPtr">xmlMutexPtr</a> tok)<br>
</pre>
<p>xmlMutexUnlock() is used to unlock a libxml2 token.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody><tr>
<td><span class="term"><i><tt>tok</tt></i>:</span></td>
<td>the simple mutex</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlNewMutex"></a>xmlNewMutex ()</h3>
<pre class="programlisting"><a href="libxml2-threads.html#xmlMutexPtr">xmlMutexPtr</a>	xmlNewMutex		(void)<br>
</pre>
<p>xmlNewMutex() is used to allocate a libxml2 token struct for use in synchronizing access to data.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody><tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>a new simple mutex pointer or NULL in case of error</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlNewRMutex"></a>xmlNewRMutex ()</h3>
<pre class="programlisting"><a href="libxml2-threads.html#xmlRMutexPtr">xmlRMutexPtr</a>	xmlNewRMutex		(void)<br>
</pre>
<p>xmlRNewMutex() is used to allocate a reentrant mutex for use in synchronizing access to data. token_r is a re-entrant lock and thus useful for synchronizing access to data structures that may be manipulated in a recursive fashion.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody><tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the new reentrant mutex pointer or NULL in case of error</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlRMutexLock"></a>xmlRMutexLock ()</h3>
<pre class="programlisting">void	xmlRMutexLock			(<a href="libxml2-threads.html#xmlRMutexPtr">xmlRMutexPtr</a> tok)<br>
</pre>
<p>xmlRMutexLock() is used to lock a libxml2 token_r.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody><tr>
<td><span class="term"><i><tt>tok</tt></i>:</span></td>
<td>the reentrant mutex</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlRMutexUnlock"></a>xmlRMutexUnlock ()</h3>
<pre class="programlisting">void	xmlRMutexUnlock			(<a href="libxml2-threads.html#xmlRMutexPtr">xmlRMutexPtr</a> tok)<br>
</pre>
<p>xmlRMutexUnlock() is used to unlock a libxml2 token_r.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody><tr>
<td><span class="term"><i><tt>tok</tt></i>:</span></td>
<td>the reentrant mutex</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlUnlockLibrary"></a>xmlUnlockLibrary ()</h3>
<pre class="programlisting">void	xmlUnlockLibrary		(void)<br>
</pre>
<p>xmlUnlockLibrary() is used to release a re-entrant lock on the libxml2 library.</p>
</div>
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