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<h1>Process Locking Routines<br>
<small>
[<a class="el" href="group__APR.html">Apache Portability Runtime library</a>]</small>
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<tr><td colspan="2"><br><h2>Typedefs</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">typedef <a class="el" href="group__apr__proc__mutex.html#ga0">apr_proc_mutex_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__proc__mutex.html#ga0">apr_proc_mutex_t</a></td></tr>
<tr><td colspan="2"><br><h2>Enumerations</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">enum </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__proc__mutex.html#ga12">apr_lockmech_e</a> { <br>
<a class="el" href="group__apr__proc__mutex.html#gga12a1">APR_LOCK_FCNTL</a>,
<a class="el" href="group__apr__proc__mutex.html#gga12a2">APR_LOCK_FLOCK</a>,
<a class="el" href="group__apr__proc__mutex.html#gga12a3">APR_LOCK_SYSVSEM</a>,
<a class="el" href="group__apr__proc__mutex.html#gga12a4">APR_LOCK_PROC_PTHREAD</a>,
<br>
<a class="el" href="group__apr__proc__mutex.html#gga12a5">APR_LOCK_POSIXSEM</a>,
<a class="el" href="group__apr__proc__mutex.html#gga12a6">APR_LOCK_DEFAULT</a>
<br>
}</td></tr>
<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="group__apr__errno.html#ga0">apr_status_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__proc__mutex.html#ga1">apr_proc_mutex_create</a> (<a class="el" href="group__apr__proc__mutex.html#ga0">apr_proc_mutex_t</a> **mutex, const char *fname, <a class="el" href="group__apr__proc__mutex.html#ga12">apr_lockmech_e</a> mech, <a class="el" href="group__apr__pools.html#ga0">apr_pool_t</a> *pool)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="group__apr__errno.html#ga0">apr_status_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__proc__mutex.html#ga2">apr_proc_mutex_child_init</a> (<a class="el" href="group__apr__proc__mutex.html#ga0">apr_proc_mutex_t</a> **mutex, const char *fname, <a class="el" href="group__apr__pools.html#ga0">apr_pool_t</a> *pool)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="group__apr__errno.html#ga0">apr_status_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__proc__mutex.html#ga3">apr_proc_mutex_lock</a> (<a class="el" href="group__apr__proc__mutex.html#ga0">apr_proc_mutex_t</a> *mutex)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="group__apr__errno.html#ga0">apr_status_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__proc__mutex.html#ga4">apr_proc_mutex_trylock</a> (<a class="el" href="group__apr__proc__mutex.html#ga0">apr_proc_mutex_t</a> *mutex)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="group__apr__errno.html#ga0">apr_status_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__proc__mutex.html#ga5">apr_proc_mutex_unlock</a> (<a class="el" href="group__apr__proc__mutex.html#ga0">apr_proc_mutex_t</a> *mutex)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="group__apr__errno.html#ga0">apr_status_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__proc__mutex.html#ga6">apr_proc_mutex_destroy</a> (<a class="el" href="group__apr__proc__mutex.html#ga0">apr_proc_mutex_t</a> *mutex)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="group__apr__errno.html#ga0">apr_status_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__proc__mutex.html#ga7">apr_proc_mutex_cleanup</a> (void *mutex)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">const char * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__proc__mutex.html#ga8">apr_proc_mutex_lockfile</a> (<a class="el" href="group__apr__proc__mutex.html#ga0">apr_proc_mutex_t</a> *mutex)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">const char * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__proc__mutex.html#ga9">apr_proc_mutex_name</a> (<a class="el" href="group__apr__proc__mutex.html#ga0">apr_proc_mutex_t</a> *mutex)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">const char * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__proc__mutex.html#ga10">apr_proc_mutex_defname</a> (void)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="group__apr__pools.html#ga0">apr_pool_t</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__proc__mutex.html#ga11">apr_proc_mutex_pool_get</a> (const <a class="el" href="group__apr__proc__mutex.html#ga0">apr_proc_mutex_t</a> *theproc_mutex)</td></tr>
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<hr><h2>Typedef Documentation</h2>
<a class="anchor" name="ga0" doxytag="apr_proc_mutex.h::apr_proc_mutex_t"></a><p>
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<td class="md" nowrap valign="top">typedef struct <a class="el" href="group__apr__proc__mutex.html#ga0">apr_proc_mutex_t</a> <a class="el" href="group__apr__proc__mutex.html#ga0">apr_proc_mutex_t</a> </td>
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<p>
Opaque structure representing a process mutex. </td>
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<hr><h2>Enumeration Type Documentation</h2>
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<td class="md" nowrap valign="top">enum <a class="el" href="group__apr__proc__mutex.html#ga12">apr_lockmech_e</a> </td>
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Enumerated potential types for APR process locking methods <dl compact><dt><b>Warning:</b></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>
<dl compact><dt><b>Enumeration values: </b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><em><a class="anchor" name="gga12a1" doxytag="APR_LOCK_FCNTL"></a>APR_LOCK_FCNTL</em> </td><td>
fcntl() </td></tr>
<tr><td valign="top"><em><a class="anchor" name="gga12a2" doxytag="APR_LOCK_FLOCK"></a>APR_LOCK_FLOCK</em> </td><td>
flock() </td></tr>
<tr><td valign="top"><em><a class="anchor" name="gga12a3" doxytag="APR_LOCK_SYSVSEM"></a>APR_LOCK_SYSVSEM</em> </td><td>
System V Semaphores </td></tr>
<tr><td valign="top"><em><a class="anchor" name="gga12a4" doxytag="APR_LOCK_PROC_PTHREAD"></a>APR_LOCK_PROC_PTHREAD</em> </td><td>
POSIX pthread process-based locking </td></tr>
<tr><td valign="top"><em><a class="anchor" name="gga12a5" doxytag="APR_LOCK_POSIXSEM"></a>APR_LOCK_POSIXSEM</em> </td><td>
POSIX semaphore process-based locking </td></tr>
<tr><td valign="top"><em><a class="anchor" name="gga12a6" doxytag="APR_LOCK_DEFAULT"></a>APR_LOCK_DEFAULT</em> </td><td>
Use the default process lock </td></tr>
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<hr><h2>Function Documentation</h2>
<a class="anchor" name="ga2" doxytag="apr_proc_mutex.h::apr_proc_mutex_child_init"></a><p>
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<td class="md" nowrap valign="top"><a class="el" href="group__apr__errno.html#ga0">apr_status_t</a> apr_proc_mutex_child_init </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="group__apr__proc__mutex.html#ga0">apr_proc_mutex_t</a> ** </td>
<td class="mdname" nowrap> <em>mutex</em>, </td>
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<td class="md" nowrap>const char * </td>
<td class="mdname" nowrap> <em>fname</em>, </td>
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<td class="md"></td>
<td class="md" nowrap><a class="el" href="group__apr__pools.html#ga0">apr_pool_t</a> * </td>
<td class="mdname" nowrap> <em>pool</em></td>
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<td class="md"></td>
<td class="md">) </td>
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Re-open a mutex in a child process. <dl compact><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 newly re-opened mutex structure. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>fname</em> </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#ga1">apr_proc_mutex_create()</a>. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>pool</em> </td><td>The pool to operate on. </td></tr>
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<dl compact><dt><b>Remarks:</b></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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<td class="md" nowrap valign="top"><a class="el" href="group__apr__errno.html#ga0">apr_status_t</a> apr_proc_mutex_cleanup </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">void * </td>
<td class="mdname1" valign="top" nowrap> <em>mutex</em> </td>
<td class="md" valign="top"> ) </td>
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<p>
Destroy the mutex and free the memory associated with the lock. <dl compact><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>
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<dl compact><dt><b>Note:</b></dt><dd>This function is generally used to kill a cleanup on an already created mutex </dd></dl>
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<td class="md" nowrap valign="top"><a class="el" href="group__apr__errno.html#ga0">apr_status_t</a> apr_proc_mutex_create </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="group__apr__proc__mutex.html#ga0">apr_proc_mutex_t</a> ** </td>
<td class="mdname" nowrap> <em>mutex</em>, </td>
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<td class="md" nowrap align="right"></td>
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<td class="md" nowrap>const char * </td>
<td class="mdname" nowrap> <em>fname</em>, </td>
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<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap><a class="el" href="group__apr__proc__mutex.html#ga12">apr_lockmech_e</a> </td>
<td class="mdname" nowrap> <em>mech</em>, </td>
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<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap><a class="el" href="group__apr__pools.html#ga0">apr_pool_t</a> * </td>
<td class="mdname" nowrap> <em>pool</em></td>
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<td class="md">) </td>
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Create and initialize a mutex that can be used to synchronize processes. <dl compact><dt><b>Parameters:</b></dt><dd>
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<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>fname</em> </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 valign="top"></td><td valign="top"><em>mech</em> </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 valign="top"></td><td valign="top"><em>pool</em> </td><td>the pool from which to allocate the mutex. </td></tr>
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<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="group__apr__proc__mutex.html#ga12">apr_lockmech_e</a> </dd></dl>
<dl compact><dt><b>Warning:</b></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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<td class="md" nowrap valign="top">const char* apr_proc_mutex_defname </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">void </td>
<td class="mdname1" valign="top" nowrap> </td>
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Display the name of the default mutex: APR_LOCK_DEFAULT </td>
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<td class="md" nowrap valign="top"><a class="el" href="group__apr__errno.html#ga0">apr_status_t</a> apr_proc_mutex_destroy </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="group__apr__proc__mutex.html#ga0">apr_proc_mutex_t</a> * </td>
<td class="mdname1" valign="top" nowrap> <em>mutex</em> </td>
<td class="md" valign="top"> ) </td>
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Destroy the mutex and free the memory associated with the lock. <dl compact><dt><b>Parameters:</b></dt><dd>
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<tr><td valign="top"></td><td valign="top"><em>mutex</em> </td><td>the mutex to destroy. </td></tr>
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<a class="anchor" name="ga3" doxytag="apr_proc_mutex.h::apr_proc_mutex_lock"></a><p>
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<td class="md" nowrap valign="top"><a class="el" href="group__apr__errno.html#ga0">apr_status_t</a> apr_proc_mutex_lock </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="group__apr__proc__mutex.html#ga0">apr_proc_mutex_t</a> * </td>
<td class="mdname1" valign="top" nowrap> <em>mutex</em> </td>
<td class="md" valign="top"> ) </td>
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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. <dl compact><dt><b>Parameters:</b></dt><dd>
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<tr><td valign="top"></td><td valign="top"><em>mutex</em> </td><td>the mutex on which to acquire the lock. </td></tr>
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<a class="anchor" name="ga8" doxytag="apr_proc_mutex.h::apr_proc_mutex_lockfile"></a><p>
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<td class="md" nowrap valign="top">const char* apr_proc_mutex_lockfile </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="group__apr__proc__mutex.html#ga0">apr_proc_mutex_t</a> * </td>
<td class="mdname1" valign="top" nowrap> <em>mutex</em> </td>
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Return the name of the lockfile for the mutex, or NULL if the mutex doesn't use a lock file </td>
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<td class="md" nowrap valign="top">const char* apr_proc_mutex_name </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="group__apr__proc__mutex.html#ga0">apr_proc_mutex_t</a> * </td>
<td class="mdname1" valign="top" nowrap> <em>mutex</em> </td>
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Display the name of the mutex, as it relates to the actual method used. This matches the valid options for Apache's AcceptMutex directive <dl compact><dt><b>Parameters:</b></dt><dd>
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<tr><td valign="top"></td><td valign="top"><em>mutex</em> </td><td>the name of the mutex </td></tr>
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<a class="anchor" name="ga11" doxytag="apr_proc_mutex.h::apr_proc_mutex_pool_get"></a><p>
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<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const <a class="el" href="group__apr__proc__mutex.html#ga0">apr_proc_mutex_t</a> * </td>
<td class="mdname1" valign="top" nowrap> <em>theproc_mutex</em> </td>
<td class="md" valign="top"> ) </td>
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<p>
Get the pool used by this proc_mutex. <dl compact><dt><b>Returns:</b></dt><dd>apr_pool_t the pool </dd></dl>
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<a class="anchor" name="ga4" doxytag="apr_proc_mutex.h::apr_proc_mutex_trylock"></a><p>
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<td class="md" nowrap valign="top"><a class="el" href="group__apr__errno.html#ga0">apr_status_t</a> apr_proc_mutex_trylock </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="group__apr__proc__mutex.html#ga0">apr_proc_mutex_t</a> * </td>
<td class="mdname1" valign="top" nowrap> <em>mutex</em> </td>
<td class="md" valign="top"> ) </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__APR__STATUS__IS.html#ga44">APR_STATUS_IS_EBUSY(s)</a> macro be used to determine if the return value was APR_EBUSY, for portability reasons. <dl compact><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>
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<a class="anchor" name="ga5" doxytag="apr_proc_mutex.h::apr_proc_mutex_unlock"></a><p>
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<td class="md" nowrap valign="top"><a class="el" href="group__apr__errno.html#ga0">apr_status_t</a> apr_proc_mutex_unlock </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="group__apr__proc__mutex.html#ga0">apr_proc_mutex_t</a> * </td>
<td class="mdname1" valign="top" nowrap> <em>mutex</em> </td>
<td class="md" valign="top"> ) </td>
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<p>
Release the lock for the given mutex. <dl compact><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>
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</dl>
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<hr size="1"><address style="align: right;"><small>Generated on Sun Mar 20 19:52:27 2005 for Apache Portable Runtime by
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