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<h1>Thread Mutex Routines<br/>
<small>
[<a class="el" href="group___a_p_r.html">Apache Portability Runtime library</a>]</small>
</h1><table border="0" cellpadding="0" cellspacing="0">
<tr><td colspan="2"><h2>Defines</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__thread__mutex.html#ga579050872f9aff06e773b084264f7d06">APR_THREAD_MUTEX_DEFAULT</a> 0x0</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__thread__mutex.html#gaf421e0445dbc3c739130f5f6544c2e78">APR_THREAD_MUTEX_NESTED</a> 0x1</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__thread__mutex.html#gac31107f3db115edc0c26ea48943c6a16">APR_THREAD_MUTEX_UNNESTED</a> 0x2</td></tr>
<tr><td colspan="2"><h2>Typedefs</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">typedef struct <a class="el" href="group__apr__thread__mutex.html#ga95712060ba3a192036416e1ccef1db75">apr_thread_mutex_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__thread__mutex.html#ga95712060ba3a192036416e1ccef1db75">apr_thread_mutex_t</a></td></tr>
<tr><td colspan="2"><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__thread__mutex.html#ga927e99580a669f577fbcb6508814ff12">apr_thread_mutex_create</a> (<a class="el" href="group__apr__thread__mutex.html#ga95712060ba3a192036416e1ccef1db75">apr_thread_mutex_t</a> **mutex, unsigned int flags, <a class="el" href="group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb">apr_pool_t</a> *pool)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__thread__mutex.html#ga1430fd10d8d260c0e3832c959742a977">apr_thread_mutex_lock</a> (<a class="el" href="group__apr__thread__mutex.html#ga95712060ba3a192036416e1ccef1db75">apr_thread_mutex_t</a> *mutex)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__thread__mutex.html#ga6ac9c8ebee83ff89416f00231a858798">apr_thread_mutex_trylock</a> (<a class="el" href="group__apr__thread__mutex.html#ga95712060ba3a192036416e1ccef1db75">apr_thread_mutex_t</a> *mutex)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__thread__mutex.html#ga74e58f753737283f9b826d8cdcbcb4bf">apr_thread_mutex_unlock</a> (<a class="el" href="group__apr__thread__mutex.html#ga95712060ba3a192036416e1ccef1db75">apr_thread_mutex_t</a> *mutex)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__thread__mutex.html#gae80e6f9c2a2fbaa94f5a6954e02118f4">apr_thread_mutex_destroy</a> (<a class="el" href="group__apr__thread__mutex.html#ga95712060ba3a192036416e1ccef1db75">apr_thread_mutex_t</a> *mutex)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb">apr_pool_t</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__thread__mutex.html#gafec9362d92f8bd67660b97cb3c246544">apr_thread_mutex_pool_get</a> (const <a class="el" href="group__apr__thread__mutex.html#ga95712060ba3a192036416e1ccef1db75">apr_thread_mutex_t</a> *thethread_mutex)</td></tr>
</table>
<hr/><h2>Define Documentation</h2>
<a class="anchor" id="ga579050872f9aff06e773b084264f7d06"></a><!-- doxytag: member="apr_thread_mutex.h::APR_THREAD_MUTEX_DEFAULT" ref="ga579050872f9aff06e773b084264f7d06" args="" -->
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<td class="memname">#define APR_THREAD_MUTEX_DEFAULT 0x0</td>
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<p>platform-optimal lock behavior </p>
</div>
</div>
<a class="anchor" id="gaf421e0445dbc3c739130f5f6544c2e78"></a><!-- doxytag: member="apr_thread_mutex.h::APR_THREAD_MUTEX_NESTED" ref="gaf421e0445dbc3c739130f5f6544c2e78" args="" -->
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<td class="memname">#define APR_THREAD_MUTEX_NESTED 0x1</td>
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<div class="memdoc">
<p>enable nested (recursive) locks </p>
</div>
</div>
<a class="anchor" id="gac31107f3db115edc0c26ea48943c6a16"></a><!-- doxytag: member="apr_thread_mutex.h::APR_THREAD_MUTEX_UNNESTED" ref="gac31107f3db115edc0c26ea48943c6a16" args="" -->
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<td class="memname">#define APR_THREAD_MUTEX_UNNESTED 0x2</td>
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<div class="memdoc">
<p>disable nested locks </p>
</div>
</div>
<hr/><h2>Typedef Documentation</h2>
<a class="anchor" id="ga95712060ba3a192036416e1ccef1db75"></a><!-- doxytag: member="apr_thread_mutex.h::apr_thread_mutex_t" ref="ga95712060ba3a192036416e1ccef1db75" args="" -->
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<td class="memname">typedef struct <a class="el" href="group__apr__thread__mutex.html#ga95712060ba3a192036416e1ccef1db75">apr_thread_mutex_t</a> <a class="el" href="group__apr__thread__mutex.html#ga95712060ba3a192036416e1ccef1db75">apr_thread_mutex_t</a></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Opaque thread-local mutex structure </p>
</div>
</div>
<hr/><h2>Function Documentation</h2>
<a class="anchor" id="ga927e99580a669f577fbcb6508814ff12"></a><!-- doxytag: member="apr_thread_mutex.h::apr_thread_mutex_create" ref="ga927e99580a669f577fbcb6508814ff12" args="(apr_thread_mutex_t **mutex, unsigned int flags, apr_pool_t *pool)" -->
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<td class="memname"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> apr_thread_mutex_create </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__apr__thread__mutex.html#ga95712060ba3a192036416e1ccef1db75">apr_thread_mutex_t</a> ** </td>
<td class="paramname"> <em>mutex</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"> <em>flags</em>, </td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb">apr_pool_t</a> * </td>
<td class="paramname"> <em>pool</em></td><td> </td>
</tr>
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<td></td>
<td>)</td>
<td></td><td></td><td></td>
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<p>Create and initialize a mutex that can be used to synchronize threads. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>mutex</em> </td><td>the memory address where the newly created mutex will be stored. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>flags</em> </td><td>Or'ed value of: </p>
<pre>
APR_THREAD_MUTEX_DEFAULT platform-optimal lock behavior.
APR_THREAD_MUTEX_NESTED enable nested (recursive) locks.
APR_THREAD_MUTEX_UNNESTED disable nested locks (non-recursive).
</pre> </td></tr>
<tr><td valign="top"></td><td valign="top"><em>pool</em> </td><td>the pool from which to allocate the mutex. </td></tr>
</table>
</dd>
</dl>
<dl class="warning"><dt><b>Warning:</b></dt><dd>Be cautious in using APR_THREAD_MUTEX_DEFAULT. While this is the most optimial mutex based on a given platform's performance charateristics, it will behave as either a nested or an unnested lock. </dd></dl>
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</div>
<a class="anchor" id="gae80e6f9c2a2fbaa94f5a6954e02118f4"></a><!-- doxytag: member="apr_thread_mutex.h::apr_thread_mutex_destroy" ref="gae80e6f9c2a2fbaa94f5a6954e02118f4" args="(apr_thread_mutex_t *mutex)" -->
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<td class="memname"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> apr_thread_mutex_destroy </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__apr__thread__mutex.html#ga95712060ba3a192036416e1ccef1db75">apr_thread_mutex_t</a> * </td>
<td class="paramname"> <em>mutex</em></td>
<td> ) </td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Destroy the mutex and free the memory associated with the lock. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>mutex</em> </td><td>the mutex to destroy. </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="ga1430fd10d8d260c0e3832c959742a977"></a><!-- doxytag: member="apr_thread_mutex.h::apr_thread_mutex_lock" ref="ga1430fd10d8d260c0e3832c959742a977" args="(apr_thread_mutex_t *mutex)" -->
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<td class="memname"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> apr_thread_mutex_lock </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__apr__thread__mutex.html#ga95712060ba3a192036416e1ccef1db75">apr_thread_mutex_t</a> * </td>
<td class="paramname"> <em>mutex</em></td>
<td> ) </td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Acquire the lock for the given mutex. If the mutex is already locked, the current thread will be put to sleep until the lock becomes available. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>mutex</em> </td><td>the mutex on which to acquire the lock. </td></tr>
</table>
</dd>
</dl>
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<a class="anchor" id="gafec9362d92f8bd67660b97cb3c246544"></a><!-- doxytag: member="apr_thread_mutex.h::apr_thread_mutex_pool_get" ref="gafec9362d92f8bd67660b97cb3c246544" args="(const apr_thread_mutex_t *thethread_mutex)" -->
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<td class="memname"><a class="el" href="group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb">apr_pool_t</a>* apr_thread_mutex_pool_get </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="group__apr__thread__mutex.html#ga95712060ba3a192036416e1ccef1db75">apr_thread_mutex_t</a> * </td>
<td class="paramname"> <em>thethread_mutex</em></td>
<td> ) </td>
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<p>Get the pool used by this thread_mutex. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>apr_pool_t the pool </dd></dl>
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<a class="anchor" id="ga6ac9c8ebee83ff89416f00231a858798"></a><!-- doxytag: member="apr_thread_mutex.h::apr_thread_mutex_trylock" ref="ga6ac9c8ebee83ff89416f00231a858798" args="(apr_thread_mutex_t *mutex)" -->
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<td class="memname"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> apr_thread_mutex_trylock </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__apr__thread__mutex.html#ga95712060ba3a192036416e1ccef1db75">apr_thread_mutex_t</a> * </td>
<td class="paramname"> <em>mutex</em></td>
<td> ) </td>
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<p>Attempt to acquire the lock for the given mutex. If the mutex has already been acquired, the call returns immediately with APR_EBUSY. Note: it is important that the <a class="el" href="group___a_p_r___s_t_a_t_u_s___i_s.html#gabb92ad7b6ef304132de70e9e5cbaa896">APR_STATUS_IS_EBUSY(s)</a> macro be used to determine if the return value was APR_EBUSY, for portability reasons. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>mutex</em> </td><td>the mutex on which to attempt the lock acquiring. </td></tr>
</table>
</dd>
</dl>
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<a class="anchor" id="ga74e58f753737283f9b826d8cdcbcb4bf"></a><!-- doxytag: member="apr_thread_mutex.h::apr_thread_mutex_unlock" ref="ga74e58f753737283f9b826d8cdcbcb4bf" args="(apr_thread_mutex_t *mutex)" -->
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<td class="memname"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> apr_thread_mutex_unlock </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__apr__thread__mutex.html#ga95712060ba3a192036416e1ccef1db75">apr_thread_mutex_t</a> * </td>
<td class="paramname"> <em>mutex</em></td>
<td> ) </td>
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<p>Release the lock for the given mutex. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>mutex</em> </td><td>the mutex from which to release the lock. </td></tr>
</table>
</dd>
</dl>
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