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libapr-devel-1.4.6-0.1mdv2010.2.i586.rpm

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<h1>apr_global_mutex.h</h1><a href="apr__global__mutex_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* Licensed to the Apache Software Foundation (ASF) under one or more</span>
<a name="l00002"></a>00002 <span class="comment"> * contributor license agreements.  See the NOTICE file distributed with</span>
<a name="l00003"></a>00003 <span class="comment"> * this work for additional information regarding copyright ownership.</span>
<a name="l00004"></a>00004 <span class="comment"> * The ASF licenses this file to You under the Apache License, Version 2.0</span>
<a name="l00005"></a>00005 <span class="comment"> * (the &quot;License&quot;); you may not use this file except in compliance with</span>
<a name="l00006"></a>00006 <span class="comment"> * the License.  You may obtain a copy of the License at</span>
<a name="l00007"></a>00007 <span class="comment"> *</span>
<a name="l00008"></a>00008 <span class="comment"> *     http://www.apache.org/licenses/LICENSE-2.0</span>
<a name="l00009"></a>00009 <span class="comment"> *</span>
<a name="l00010"></a>00010 <span class="comment"> * Unless required by applicable law or agreed to in writing, software</span>
<a name="l00011"></a>00011 <span class="comment"> * distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span>
<a name="l00012"></a>00012 <span class="comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<a name="l00013"></a>00013 <span class="comment"> * See the License for the specific language governing permissions and</span>
<a name="l00014"></a>00014 <span class="comment"> * limitations under the License.</span>
<a name="l00015"></a>00015 <span class="comment"> */</span>
<a name="l00016"></a>00016 
<a name="l00017"></a>00017 <span class="preprocessor">#ifndef APR_GLOBAL_MUTEX_H</span>
<a name="l00018"></a>00018 <span class="preprocessor"></span><span class="preprocessor">#define APR_GLOBAL_MUTEX_H</span>
<a name="l00019"></a>00019 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00020"></a>00020 <span class="comment">/**</span>
<a name="l00021"></a>00021 <span class="comment"> * @file apr_global_mutex.h</span>
<a name="l00022"></a>00022 <span class="comment"> * @brief APR Global Locking Routines</span>
<a name="l00023"></a>00023 <span class="comment"> */</span>
<a name="l00024"></a>00024 
<a name="l00025"></a>00025 <span class="preprocessor">#include &quot;<a class="code" href="apr_8h.html" title="APR Platform Definitions.">apr.h</a>&quot;</span>
<a name="l00026"></a>00026 <span class="preprocessor">#include &quot;<a class="code" href="apr__proc__mutex_8h.html" title="APR Process Locking Routines.">apr_proc_mutex.h</a>&quot;</span>    <span class="comment">/* only for apr_lockmech_e */</span>
<a name="l00027"></a>00027 <span class="preprocessor">#include &quot;<a class="code" href="apr__pools_8h.html" title="APR memory allocation.">apr_pools.h</a>&quot;</span>
<a name="l00028"></a>00028 <span class="preprocessor">#include &quot;<a class="code" href="apr__errno_8h.html" title="APR Error Codes.">apr_errno.h</a>&quot;</span>
<a name="l00029"></a>00029 <span class="preprocessor">#if APR_PROC_MUTEX_IS_GLOBAL</span>
<a name="l00030"></a>00030 <span class="preprocessor"></span><span class="preprocessor">#include &quot;<a class="code" href="apr__proc__mutex_8h.html" title="APR Process Locking Routines.">apr_proc_mutex.h</a>&quot;</span>
<a name="l00031"></a>00031 <span class="preprocessor">#endif</span>
<a name="l00032"></a>00032 <span class="preprocessor"></span>
<a name="l00033"></a>00033 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l00034"></a>00034 <span class="preprocessor"></span><span class="keyword">extern</span> <span class="stringliteral">&quot;C&quot;</span> {
<a name="l00035"></a>00035 <span class="preprocessor">#endif </span><span class="comment">/* __cplusplus */</span>
<a name="l00036"></a>00036 <span class="comment"></span>
<a name="l00037"></a>00037 <span class="comment">/**</span>
<a name="l00038"></a>00038 <span class="comment"> * @defgroup APR_GlobalMutex Global Locking Routines</span>
<a name="l00039"></a>00039 <span class="comment"> * @ingroup APR </span>
<a name="l00040"></a>00040 <span class="comment"> * @{</span>
<a name="l00041"></a>00041 <span class="comment"> */</span>
<a name="l00042"></a>00042 
<a name="l00043"></a>00043 <span class="preprocessor">#if !APR_PROC_MUTEX_IS_GLOBAL || defined(DOXYGEN)</span>
<a name="l00044"></a>00044 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00045"></a>00045 <span class="comment">/** Opaque global mutex structure. */</span>
<a name="l00046"></a><a class="code" href="group___a_p_r___global_mutex.html#ga3fc7dc5b076533ee566aa4888ac35ee7">00046</a> <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="group___a_p_r___global_mutex.html#ga3fc7dc5b076533ee566aa4888ac35ee7">apr_global_mutex_t</a> <a class="code" href="group___a_p_r___global_mutex.html#ga3fc7dc5b076533ee566aa4888ac35ee7">apr_global_mutex_t</a>;
<a name="l00047"></a>00047 
<a name="l00048"></a>00048 <span class="comment">/*   Function definitions */</span>
<a name="l00049"></a>00049 <span class="comment"></span>
<a name="l00050"></a>00050 <span class="comment">/**</span>
<a name="l00051"></a>00051 <span class="comment"> * Create and initialize a mutex that can be used to synchronize both</span>
<a name="l00052"></a>00052 <span class="comment"> * processes and threads. Note: There is considerable overhead in using</span>
<a name="l00053"></a>00053 <span class="comment"> * this API if only cross-process or cross-thread mutual exclusion is</span>
<a name="l00054"></a>00054 <span class="comment"> * required. See apr_proc_mutex.h and apr_thread_mutex.h for more</span>
<a name="l00055"></a>00055 <span class="comment"> * specialized lock routines.</span>
<a name="l00056"></a>00056 <span class="comment"> * @param mutex the memory address where the newly created mutex will be</span>
<a name="l00057"></a>00057 <span class="comment"> *        stored.</span>
<a name="l00058"></a>00058 <span class="comment"> * @param fname A file name to use if the lock mechanism requires one.  This</span>
<a name="l00059"></a>00059 <span class="comment"> *        argument should always be provided.  The lock code itself will</span>
<a name="l00060"></a>00060 <span class="comment"> *        determine if it should be used.</span>
<a name="l00061"></a>00061 <span class="comment"> * @param mech The mechanism to use for the interprocess lock, if any; one of</span>
<a name="l00062"></a>00062 <span class="comment"> * &lt;PRE&gt;</span>
<a name="l00063"></a>00063 <span class="comment"> *            APR_LOCK_FCNTL</span>
<a name="l00064"></a>00064 <span class="comment"> *            APR_LOCK_FLOCK</span>
<a name="l00065"></a>00065 <span class="comment"> *            APR_LOCK_SYSVSEM</span>
<a name="l00066"></a>00066 <span class="comment"> *            APR_LOCK_POSIXSEM</span>
<a name="l00067"></a>00067 <span class="comment"> *            APR_LOCK_PROC_PTHREAD</span>
<a name="l00068"></a>00068 <span class="comment"> *            APR_LOCK_DEFAULT     pick the default mechanism for the platform</span>
<a name="l00069"></a>00069 <span class="comment"> * &lt;/PRE&gt;</span>
<a name="l00070"></a>00070 <span class="comment"> * @param pool the pool from which to allocate the mutex.</span>
<a name="l00071"></a>00071 <span class="comment"> * @warning Check APR_HAS_foo_SERIALIZE defines to see if the platform supports</span>
<a name="l00072"></a>00072 <span class="comment"> *          APR_LOCK_foo.  Only APR_LOCK_DEFAULT is portable.</span>
<a name="l00073"></a>00073 <span class="comment"> */</span>
<a name="l00074"></a>00074 <a class="code" href="group__apr__platform.html#gad7b91b811a172bfa802603c2fb688f98">APR_DECLARE</a>(<a class="code" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a>) <a class="code" href="group___a_p_r___global_mutex.html#ga7a5ade1ba8ea6c7a7a61e3e719683cb0">apr_global_mutex_create</a>(<a class="code" href="group___a_p_r___global_mutex.html#ga3fc7dc5b076533ee566aa4888ac35ee7">apr_global_mutex_t</a> **mutex,
<a name="l00075"></a>00075                                                   const <span class="keywordtype">char</span> *fname,
<a name="l00076"></a>00076                                                   <a class="code" href="group__apr__proc__mutex.html#ga75dd95a48a1e855a87b509b522746ed4">apr_lockmech_e</a> mech,
<a name="l00077"></a>00077                                                   <a class="code" href="group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb">apr_pool_t</a> *pool);
<a name="l00078"></a>00078 <span class="comment"></span>
<a name="l00079"></a>00079 <span class="comment">/**</span>
<a name="l00080"></a>00080 <span class="comment"> * Re-open a mutex in a child process.</span>
<a name="l00081"></a>00081 <span class="comment"> * @param mutex The newly re-opened mutex structure.</span>
<a name="l00082"></a>00082 <span class="comment"> * @param fname A file name to use if the mutex mechanism requires one.  This</span>
<a name="l00083"></a>00083 <span class="comment"> *              argument should always be provided.  The mutex code itself will</span>
<a name="l00084"></a>00084 <span class="comment"> *              determine if it should be used.  This filename should be the </span>
<a name="l00085"></a>00085 <span class="comment"> *              same one that was passed to apr_global_mutex_create().</span>
<a name="l00086"></a>00086 <span class="comment"> * @param pool The pool to operate on.</span>
<a name="l00087"></a>00087 <span class="comment"> * @remark This function must be called to maintain portability, even</span>
<a name="l00088"></a>00088 <span class="comment"> *         if the underlying lock mechanism does not require it.</span>
<a name="l00089"></a>00089 <span class="comment"> */</span>
<a name="l00090"></a>00090 <a class="code" href="group__apr__platform.html#gad7b91b811a172bfa802603c2fb688f98">APR_DECLARE</a>(<a class="code" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a>) <a class="code" href="group___a_p_r___global_mutex.html#ga51eb034bca0352075c92c08a21d4d7a0">apr_global_mutex_child_init</a>(
<a name="l00091"></a>00091                               <a class="code" href="group___a_p_r___global_mutex.html#ga3fc7dc5b076533ee566aa4888ac35ee7">apr_global_mutex_t</a> **mutex,
<a name="l00092"></a>00092                               const <span class="keywordtype">char</span> *fname,
<a name="l00093"></a>00093                               <a class="code" href="group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb">apr_pool_t</a> *pool);
<a name="l00094"></a>00094 <span class="comment"></span>
<a name="l00095"></a>00095 <span class="comment">/**</span>
<a name="l00096"></a>00096 <span class="comment"> * Acquire the lock for the given mutex. If the mutex is already locked,</span>
<a name="l00097"></a>00097 <span class="comment"> * the current thread will be put to sleep until the lock becomes available.</span>
<a name="l00098"></a>00098 <span class="comment"> * @param mutex the mutex on which to acquire the lock.</span>
<a name="l00099"></a>00099 <span class="comment"> */</span>
<a name="l00100"></a>00100 <a class="code" href="group__apr__platform.html#gad7b91b811a172bfa802603c2fb688f98">APR_DECLARE</a>(<a class="code" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a>) <a class="code" href="group___a_p_r___global_mutex.html#ga1338485664e6c2737340114cace57121">apr_global_mutex_lock</a>(<a class="code" href="group___a_p_r___global_mutex.html#ga3fc7dc5b076533ee566aa4888ac35ee7">apr_global_mutex_t</a> *mutex);
<a name="l00101"></a>00101 <span class="comment"></span>
<a name="l00102"></a>00102 <span class="comment">/**</span>
<a name="l00103"></a>00103 <span class="comment"> * Attempt to acquire the lock for the given mutex. If the mutex has already</span>
<a name="l00104"></a>00104 <span class="comment"> * been acquired, the call returns immediately with APR_EBUSY. Note: it</span>
<a name="l00105"></a>00105 <span class="comment"> * is important that the APR_STATUS_IS_EBUSY(s) macro be used to determine</span>
<a name="l00106"></a>00106 <span class="comment"> * if the return value was APR_EBUSY, for portability reasons.</span>
<a name="l00107"></a>00107 <span class="comment"> * @param mutex the mutex on which to attempt the lock acquiring.</span>
<a name="l00108"></a>00108 <span class="comment"> */</span>
<a name="l00109"></a>00109 <a class="code" href="group__apr__platform.html#gad7b91b811a172bfa802603c2fb688f98">APR_DECLARE</a>(<a class="code" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a>) <a class="code" href="group___a_p_r___global_mutex.html#ga2a6543fba6473b47e33a7b7fc2ba6935">apr_global_mutex_trylock</a>(<a class="code" href="group___a_p_r___global_mutex.html#ga3fc7dc5b076533ee566aa4888ac35ee7">apr_global_mutex_t</a> *mutex);
<a name="l00110"></a>00110 <span class="comment"></span>
<a name="l00111"></a>00111 <span class="comment">/**</span>
<a name="l00112"></a>00112 <span class="comment"> * Release the lock for the given mutex.</span>
<a name="l00113"></a>00113 <span class="comment"> * @param mutex the mutex from which to release the lock.</span>
<a name="l00114"></a>00114 <span class="comment"> */</span>
<a name="l00115"></a>00115 <a class="code" href="group__apr__platform.html#gad7b91b811a172bfa802603c2fb688f98">APR_DECLARE</a>(<a class="code" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a>) <a class="code" href="group___a_p_r___global_mutex.html#ga16e732ae76dfe104b157e0fc543d3aa3">apr_global_mutex_unlock</a>(<a class="code" href="group___a_p_r___global_mutex.html#ga3fc7dc5b076533ee566aa4888ac35ee7">apr_global_mutex_t</a> *mutex);
<a name="l00116"></a>00116 <span class="comment"></span>
<a name="l00117"></a>00117 <span class="comment">/**</span>
<a name="l00118"></a>00118 <span class="comment"> * Destroy the mutex and free the memory associated with the lock.</span>
<a name="l00119"></a>00119 <span class="comment"> * @param mutex the mutex to destroy.</span>
<a name="l00120"></a>00120 <span class="comment"> */</span>
<a name="l00121"></a>00121 <a class="code" href="group__apr__platform.html#gad7b91b811a172bfa802603c2fb688f98">APR_DECLARE</a>(<a class="code" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a>) <a class="code" href="group___a_p_r___global_mutex.html#ga1f2cb4a1ec57089db49701e747892607">apr_global_mutex_destroy</a>(<a class="code" href="group___a_p_r___global_mutex.html#ga3fc7dc5b076533ee566aa4888ac35ee7">apr_global_mutex_t</a> *mutex);
<a name="l00122"></a>00122 <span class="comment"></span>
<a name="l00123"></a>00123 <span class="comment">/**</span>
<a name="l00124"></a>00124 <span class="comment"> * Return the name of the lockfile for the mutex, or NULL</span>
<a name="l00125"></a>00125 <span class="comment"> * if the mutex doesn&#39;t use a lock file</span>
<a name="l00126"></a>00126 <span class="comment"> */</span>
<a name="l00127"></a>00127 <a class="code" href="group__apr__platform.html#gad7b91b811a172bfa802603c2fb688f98">APR_DECLARE</a>(const <span class="keywordtype">char</span> *) <a class="code" href="group___a_p_r___global_mutex.html#ga0d14b6c80cc39bb76f6a038fff1ef5ad">apr_global_mutex_lockfile</a>(<a class="code" href="group___a_p_r___global_mutex.html#ga3fc7dc5b076533ee566aa4888ac35ee7">apr_global_mutex_t</a> *mutex);
<a name="l00128"></a>00128 <span class="comment"></span>
<a name="l00129"></a>00129 <span class="comment">/**</span>
<a name="l00130"></a>00130 <span class="comment"> * Display the name of the mutex, as it relates to the actual method used</span>
<a name="l00131"></a>00131 <span class="comment"> * for the underlying apr_proc_mutex_t, if any.  NULL is returned if</span>
<a name="l00132"></a>00132 <span class="comment"> * there is no underlying apr_proc_mutex_t.</span>
<a name="l00133"></a>00133 <span class="comment"> * @param mutex the name of the mutex</span>
<a name="l00134"></a>00134 <span class="comment"> */</span>
<a name="l00135"></a>00135 <a class="code" href="group__apr__platform.html#gad7b91b811a172bfa802603c2fb688f98">APR_DECLARE</a>(const <span class="keywordtype">char</span> *) <a class="code" href="group___a_p_r___global_mutex.html#gaf4ec155e8b9c6f30a979bc0aeb3721cb">apr_global_mutex_name</a>(<a class="code" href="group___a_p_r___global_mutex.html#ga3fc7dc5b076533ee566aa4888ac35ee7">apr_global_mutex_t</a> *mutex);
<a name="l00136"></a>00136 <span class="comment"></span>
<a name="l00137"></a>00137 <span class="comment">/**</span>
<a name="l00138"></a>00138 <span class="comment"> * Get the pool used by this global_mutex.</span>
<a name="l00139"></a>00139 <span class="comment"> * @return apr_pool_t the pool</span>
<a name="l00140"></a>00140 <span class="comment"> */</span>
<a name="l00141"></a>00141 <a class="code" href="group__apr__pools.html#ga89ce1d55c7f0c39ea87c88eabd655394">APR_POOL_DECLARE_ACCESSOR</a>(global_mutex);
<a name="l00142"></a>00142 
<a name="l00143"></a>00143 <span class="preprocessor">#else </span><span class="comment">/* APR_PROC_MUTEX_IS_GLOBAL */</span>
<a name="l00144"></a>00144 
<a name="l00145"></a>00145 <span class="comment">/* Some platforms [e.g. Win32] have cross process locks that are truly</span>
<a name="l00146"></a>00146 <span class="comment"> * global locks, since there isn&#39;t the concept of cross-process locks.</span>
<a name="l00147"></a>00147 <span class="comment"> * Define these platforms in terms of an apr_proc_mutex_t.</span>
<a name="l00148"></a>00148 <span class="comment"> */</span>
<a name="l00149"></a>00149 
<a name="l00150"></a>00150 <span class="preprocessor">#define apr_global_mutex_t          apr_proc_mutex_t</span>
<a name="l00151"></a>00151 <span class="preprocessor"></span><span class="preprocessor">#define apr_global_mutex_create     apr_proc_mutex_create</span>
<a name="l00152"></a>00152 <span class="preprocessor"></span><span class="preprocessor">#define apr_global_mutex_child_init apr_proc_mutex_child_init</span>
<a name="l00153"></a>00153 <span class="preprocessor"></span><span class="preprocessor">#define apr_global_mutex_lock       apr_proc_mutex_lock</span>
<a name="l00154"></a>00154 <span class="preprocessor"></span><span class="preprocessor">#define apr_global_mutex_trylock    apr_proc_mutex_trylock</span>
<a name="l00155"></a>00155 <span class="preprocessor"></span><span class="preprocessor">#define apr_global_mutex_unlock     apr_proc_mutex_unlock</span>
<a name="l00156"></a>00156 <span class="preprocessor"></span><span class="preprocessor">#define apr_global_mutex_destroy    apr_proc_mutex_destroy</span>
<a name="l00157"></a>00157 <span class="preprocessor"></span><span class="preprocessor">#define apr_global_mutex_lockfile   apr_proc_mutex_lockfile</span>
<a name="l00158"></a>00158 <span class="preprocessor"></span><span class="preprocessor">#define apr_global_mutex_name       apr_proc_mutex_name</span>
<a name="l00159"></a>00159 <span class="preprocessor"></span><span class="preprocessor">#define apr_global_mutex_pool_get   apr_proc_mutex_pool_get</span>
<a name="l00160"></a>00160 <span class="preprocessor"></span>
<a name="l00161"></a>00161 <span class="preprocessor">#endif</span>
<a name="l00162"></a>00162 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00163"></a>00163 <span class="comment">/** @} */</span>
<a name="l00164"></a>00164 
<a name="l00165"></a>00165 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l00166"></a>00166 <span class="preprocessor"></span>}
<a name="l00167"></a>00167 <span class="preprocessor">#endif</span>
<a name="l00168"></a>00168 <span class="preprocessor"></span>
<a name="l00169"></a>00169 <span class="preprocessor">#endif  </span><span class="comment">/* ndef APR_GLOBAL_MUTEX_H */</span>
</pre></div></div>
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