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<div class="title">Process Locking Routines<div class="ingroups"><a class="el" href="group___a_p_r.html">Apache Portability Runtime library</a></div></div> </div>
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Typedefs</h2></td></tr>
<tr class="memitem:ga0fae3a1ab686cd1f252c6062e4c97bd2"><td class="memItemLeft" align="right" valign="top">typedef struct <a class="el" href="group__apr__proc__mutex.html#ga0fae3a1ab686cd1f252c6062e4c97bd2">apr_proc_mutex_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__proc__mutex.html#ga0fae3a1ab686cd1f252c6062e4c97bd2">apr_proc_mutex_t</a></td></tr>
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Enumerations</h2></td></tr>
<tr class="memitem:ga75dd95a48a1e855a87b509b522746ed4"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__proc__mutex.html#ga75dd95a48a1e855a87b509b522746ed4">apr_lockmech_e</a> { <br />
  <a class="el" href="group__apr__proc__mutex.html#gga75dd95a48a1e855a87b509b522746ed4ad9dad69d83d1e112054ad21a7e4e16b3">APR_LOCK_FCNTL</a>,
<a class="el" href="group__apr__proc__mutex.html#gga75dd95a48a1e855a87b509b522746ed4a1d06f73a37dae31233299401c9594b41">APR_LOCK_FLOCK</a>,
<a class="el" href="group__apr__proc__mutex.html#gga75dd95a48a1e855a87b509b522746ed4a642536695bd4c233761a15d48b1d6487">APR_LOCK_SYSVSEM</a>,
<a class="el" href="group__apr__proc__mutex.html#gga75dd95a48a1e855a87b509b522746ed4abd5e7cca2c9f6023b541131f3841057a">APR_LOCK_PROC_PTHREAD</a>,
<br />
  <a class="el" href="group__apr__proc__mutex.html#gga75dd95a48a1e855a87b509b522746ed4a6d65d9d745e13d8759bd8f1057f27041">APR_LOCK_POSIXSEM</a>,
<a class="el" href="group__apr__proc__mutex.html#gga75dd95a48a1e855a87b509b522746ed4ae91fb435c45216bcf84f506db99d0f19">APR_LOCK_DEFAULT</a>
<br />
}</td></tr>
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Functions</h2></td></tr>
<tr class="memitem:ga57a0ad8cc6209dcbc8cf7c4bdf4a2c22"><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__proc__mutex.html#ga57a0ad8cc6209dcbc8cf7c4bdf4a2c22">apr_proc_mutex_create</a> (<a class="el" href="group__apr__proc__mutex.html#ga0fae3a1ab686cd1f252c6062e4c97bd2">apr_proc_mutex_t</a> **mutex, const char *fname, <a class="el" href="group__apr__proc__mutex.html#ga75dd95a48a1e855a87b509b522746ed4">apr_lockmech_e</a> mech, <a class="el" href="group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb">apr_pool_t</a> *pool)</td></tr>
<tr class="separator:ga57a0ad8cc6209dcbc8cf7c4bdf4a2c22"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga52c440b92eda07dc9c851a4e98f2ac83"><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__proc__mutex.html#ga52c440b92eda07dc9c851a4e98f2ac83">apr_proc_mutex_child_init</a> (<a class="el" href="group__apr__proc__mutex.html#ga0fae3a1ab686cd1f252c6062e4c97bd2">apr_proc_mutex_t</a> **mutex, const char *fname, <a class="el" href="group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb">apr_pool_t</a> *pool)</td></tr>
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<tr class="memitem:ga9af7c9eabf4f99a5a33b41dc322af06f"><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__proc__mutex.html#ga9af7c9eabf4f99a5a33b41dc322af06f">apr_proc_mutex_lock</a> (<a class="el" href="group__apr__proc__mutex.html#ga0fae3a1ab686cd1f252c6062e4c97bd2">apr_proc_mutex_t</a> *mutex)</td></tr>
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<tr class="memitem:ga7c41927ce5014374eb4fc66d410f9513"><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__proc__mutex.html#ga7c41927ce5014374eb4fc66d410f9513">apr_proc_mutex_trylock</a> (<a class="el" href="group__apr__proc__mutex.html#ga0fae3a1ab686cd1f252c6062e4c97bd2">apr_proc_mutex_t</a> *mutex)</td></tr>
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<tr class="memitem:ga4ecd9a73fbb0e6e6853e5d0769bbb183"><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__proc__mutex.html#ga4ecd9a73fbb0e6e6853e5d0769bbb183">apr_proc_mutex_unlock</a> (<a class="el" href="group__apr__proc__mutex.html#ga0fae3a1ab686cd1f252c6062e4c97bd2">apr_proc_mutex_t</a> *mutex)</td></tr>
<tr class="separator:ga4ecd9a73fbb0e6e6853e5d0769bbb183"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gaa692ccd799305e0166fb81f258870830"><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__proc__mutex.html#gaa692ccd799305e0166fb81f258870830">apr_proc_mutex_destroy</a> (<a class="el" href="group__apr__proc__mutex.html#ga0fae3a1ab686cd1f252c6062e4c97bd2">apr_proc_mutex_t</a> *mutex)</td></tr>
<tr class="separator:gaa692ccd799305e0166fb81f258870830"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga71ec4d283f58e893322f44116e6f8ea2"><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__proc__mutex.html#ga71ec4d283f58e893322f44116e6f8ea2">apr_proc_mutex_cleanup</a> (void *mutex)</td></tr>
<tr class="separator:ga71ec4d283f58e893322f44116e6f8ea2"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gad4dcc5ec2a5a6ede7be178e13f56377a"><td class="memItemLeft" align="right" valign="top">const char * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__proc__mutex.html#gad4dcc5ec2a5a6ede7be178e13f56377a">apr_proc_mutex_lockfile</a> (<a class="el" href="group__apr__proc__mutex.html#ga0fae3a1ab686cd1f252c6062e4c97bd2">apr_proc_mutex_t</a> *mutex)</td></tr>
<tr class="separator:gad4dcc5ec2a5a6ede7be178e13f56377a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga3e5cf6b6fd0736502efd91312d50881c"><td class="memItemLeft" align="right" valign="top">const char * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__proc__mutex.html#ga3e5cf6b6fd0736502efd91312d50881c">apr_proc_mutex_name</a> (<a class="el" href="group__apr__proc__mutex.html#ga0fae3a1ab686cd1f252c6062e4c97bd2">apr_proc_mutex_t</a> *mutex)</td></tr>
<tr class="separator:ga3e5cf6b6fd0736502efd91312d50881c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gaf4425adc130f83784c552b6bc1563036"><td class="memItemLeft" align="right" valign="top">const char * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__proc__mutex.html#gaf4425adc130f83784c552b6bc1563036">apr_proc_mutex_defname</a> (void)</td></tr>
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<tr class="memitem:ga9d7eda31ec4ad2183ddfcbff2f07daf9"><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__proc__mutex.html#ga9d7eda31ec4ad2183ddfcbff2f07daf9">apr_proc_mutex_pool_get</a> (const <a class="el" href="group__apr__proc__mutex.html#ga0fae3a1ab686cd1f252c6062e4c97bd2">apr_proc_mutex_t</a> *theproc_mutex)</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<h2 class="groupheader">Typedef Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ga0fae3a1ab686cd1f252c6062e4c97bd2">◆ </a></span>apr_proc_mutex_t</h2>
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<td class="memname">typedef struct <a class="el" href="group__apr__proc__mutex.html#ga0fae3a1ab686cd1f252c6062e4c97bd2">apr_proc_mutex_t</a> <a class="el" href="group__apr__proc__mutex.html#ga0fae3a1ab686cd1f252c6062e4c97bd2">apr_proc_mutex_t</a></td>
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<p>Opaque structure representing a process mutex. </p>
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<h2 class="groupheader">Enumeration Type Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ga75dd95a48a1e855a87b509b522746ed4">◆ </a></span>apr_lockmech_e</h2>
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<td class="memname">enum <a class="el" href="group__apr__proc__mutex.html#ga75dd95a48a1e855a87b509b522746ed4">apr_lockmech_e</a></td>
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<p>Enumerated potential types for APR process locking methods </p><dl class="section warning"><dt>Warning</dt><dd>Check APR_HAS_foo_SERIALIZE defines to see if the platform supports APR_LOCK_foo. Only APR_LOCK_DEFAULT is portable. </dd></dl>
<table class="fieldtable">
<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="gga75dd95a48a1e855a87b509b522746ed4ad9dad69d83d1e112054ad21a7e4e16b3"></a>APR_LOCK_FCNTL </td><td class="fielddoc"><p>fcntl() </p>
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<tr><td class="fieldname"><a id="gga75dd95a48a1e855a87b509b522746ed4a1d06f73a37dae31233299401c9594b41"></a>APR_LOCK_FLOCK </td><td class="fielddoc"><p>flock() </p>
</td></tr>
<tr><td class="fieldname"><a id="gga75dd95a48a1e855a87b509b522746ed4a642536695bd4c233761a15d48b1d6487"></a>APR_LOCK_SYSVSEM </td><td class="fielddoc"><p>System V Semaphores </p>
</td></tr>
<tr><td class="fieldname"><a id="gga75dd95a48a1e855a87b509b522746ed4abd5e7cca2c9f6023b541131f3841057a"></a>APR_LOCK_PROC_PTHREAD </td><td class="fielddoc"><p>POSIX pthread process-based locking </p>
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<tr><td class="fieldname"><a id="gga75dd95a48a1e855a87b509b522746ed4a6d65d9d745e13d8759bd8f1057f27041"></a>APR_LOCK_POSIXSEM </td><td class="fielddoc"><p>POSIX semaphore process-based locking </p>
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<tr><td class="fieldname"><a id="gga75dd95a48a1e855a87b509b522746ed4ae91fb435c45216bcf84f506db99d0f19"></a>APR_LOCK_DEFAULT </td><td class="fielddoc"><p>Use the default process lock </p>
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<h2 class="groupheader">Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ga52c440b92eda07dc9c851a4e98f2ac83">◆ </a></span>apr_proc_mutex_child_init()</h2>
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<td class="memname"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> apr_proc_mutex_child_init </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__apr__proc__mutex.html#ga0fae3a1ab686cd1f252c6062e4c97bd2">apr_proc_mutex_t</a> ** </td>
<td class="paramname"><em>mutex</em>, </td>
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<td class="paramtype">const char * </td>
<td class="paramname"><em>fname</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype"><a class="el" href="group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb">apr_pool_t</a> * </td>
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<p>Re-open a mutex in a child process. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">mutex</td><td>The newly re-opened mutex structure. </td></tr>
<tr><td class="paramname">fname</td><td>A file name to use if the mutex mechanism requires one. This argument should always be provided. The mutex code itself will determine if it should be used. This filename should be the same one that was passed to <a class="el" href="group__apr__proc__mutex.html#ga57a0ad8cc6209dcbc8cf7c4bdf4a2c22">apr_proc_mutex_create()</a>. </td></tr>
<tr><td class="paramname">pool</td><td>The pool to operate on. </td></tr>
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<dl class="section remark"><dt>Remarks</dt><dd>This function must be called to maintain portability, even if the underlying lock mechanism does not require it. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga71ec4d283f58e893322f44116e6f8ea2">◆ </a></span>apr_proc_mutex_cleanup()</h2>
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<td class="memname"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> apr_proc_mutex_cleanup </td>
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<p>Destroy the mutex and free the memory associated with the lock. </p><dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">mutex</td><td>the mutex to destroy. </td></tr>
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<dl class="section note"><dt>Note</dt><dd>This function is generally used to kill a cleanup on an already created mutex </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga57a0ad8cc6209dcbc8cf7c4bdf4a2c22">◆ </a></span>apr_proc_mutex_create()</h2>
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<td class="memname"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> apr_proc_mutex_create </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__apr__proc__mutex.html#ga0fae3a1ab686cd1f252c6062e4c97bd2">apr_proc_mutex_t</a> ** </td>
<td class="paramname"><em>mutex</em>, </td>
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<td class="paramtype">const char * </td>
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<td class="paramtype"><a class="el" href="group__apr__proc__mutex.html#ga75dd95a48a1e855a87b509b522746ed4">apr_lockmech_e</a> </td>
<td class="paramname"><em>mech</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype"><a class="el" href="group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb">apr_pool_t</a> * </td>
<td class="paramname"><em>pool</em> </td>
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<p>Create and initialize a mutex that can be used to synchronize processes. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">mutex</td><td>the memory address where the newly created mutex will be stored. </td></tr>
<tr><td class="paramname">fname</td><td>A file name to use if the lock mechanism requires one. This argument should always be provided. The lock code itself will determine if it should be used. </td></tr>
<tr><td class="paramname">mech</td><td>The mechanism to use for the interprocess lock, if any; one of <pre>
APR_LOCK_FCNTL
APR_LOCK_FLOCK
APR_LOCK_SYSVSEM
APR_LOCK_POSIXSEM
APR_LOCK_PROC_PTHREAD
APR_LOCK_DEFAULT pick the default mechanism for the platform
</pre> </td></tr>
<tr><td class="paramname">pool</td><td>the pool from which to allocate the mutex. </td></tr>
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<dl class="section see"><dt>See also</dt><dd><a class="el" href="group__apr__proc__mutex.html#ga75dd95a48a1e855a87b509b522746ed4">apr_lockmech_e</a> </dd></dl>
<dl class="section warning"><dt>Warning</dt><dd>Check APR_HAS_foo_SERIALIZE defines to see if the platform supports APR_LOCK_foo. Only APR_LOCK_DEFAULT is portable. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gaf4425adc130f83784c552b6bc1563036">◆ </a></span>apr_proc_mutex_defname()</h2>
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<td class="memname">const char* apr_proc_mutex_defname </td>
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<p>Display the name of the default mutex: APR_LOCK_DEFAULT </p>
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<h2 class="memtitle"><span class="permalink"><a href="#gaa692ccd799305e0166fb81f258870830">◆ </a></span>apr_proc_mutex_destroy()</h2>
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<td class="memname"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> apr_proc_mutex_destroy </td>
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<td class="paramtype"><a class="el" href="group__apr__proc__mutex.html#ga0fae3a1ab686cd1f252c6062e4c97bd2">apr_proc_mutex_t</a> * </td>
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<p>Destroy the mutex and free the memory associated with the lock. </p><dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">mutex</td><td>the mutex to destroy. </td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#ga9af7c9eabf4f99a5a33b41dc322af06f">◆ </a></span>apr_proc_mutex_lock()</h2>
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<td class="memname"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> apr_proc_mutex_lock </td>
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<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 class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">mutex</td><td>the mutex on which to acquire the lock. </td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#gad4dcc5ec2a5a6ede7be178e13f56377a">◆ </a></span>apr_proc_mutex_lockfile()</h2>
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<td class="memname">const char* apr_proc_mutex_lockfile </td>
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<p>Return the name of the lockfile for the mutex, or NULL if the mutex doesn't use a lock file </p>
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<h2 class="memtitle"><span class="permalink"><a href="#ga3e5cf6b6fd0736502efd91312d50881c">◆ </a></span>apr_proc_mutex_name()</h2>
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<td class="memname">const char* apr_proc_mutex_name </td>
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<td class="paramtype"><a class="el" href="group__apr__proc__mutex.html#ga0fae3a1ab686cd1f252c6062e4c97bd2">apr_proc_mutex_t</a> * </td>
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<p>Display the name of the mutex, as it relates to the actual method used. This matches the valid options for Apache's AcceptMutex directive </p><dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">mutex</td><td>the name of the mutex </td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#ga9d7eda31ec4ad2183ddfcbff2f07daf9">◆ </a></span>apr_proc_mutex_pool_get()</h2>
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<td class="memname"><a class="el" href="group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb">apr_pool_t</a>* apr_proc_mutex_pool_get </td>
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<p>Get the pool used by this proc_mutex. </p><dl class="section return"><dt>Returns</dt><dd>apr_pool_t the pool </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga7c41927ce5014374eb4fc66d410f9513">◆ </a></span>apr_proc_mutex_trylock()</h2>
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<td class="memname"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> apr_proc_mutex_trylock </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 class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">mutex</td><td>the mutex on which to attempt the lock acquiring. </td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#ga4ecd9a73fbb0e6e6853e5d0769bbb183">◆ </a></span>apr_proc_mutex_unlock()</h2>
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<td class="memname"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> apr_proc_mutex_unlock </td>
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<td class="paramtype"><a class="el" href="group__apr__proc__mutex.html#ga0fae3a1ab686cd1f252c6062e4c97bd2">apr_proc_mutex_t</a> * </td>
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<p>Release the lock for the given mutex. </p><dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">mutex</td><td>the mutex from which to release the lock. </td></tr>
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