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<h1>apr_atomic.h</h1><a href="apr__atomic_8h.html">Go to the documentation of this file.</a><pre class="fragment"><div>00001 <span class="comment">/* Copyright 2000-2005 The Apache Software Foundation or its licensors, as</span>
00002 <span class="comment"> * applicable.</span>
00003 <span class="comment"> *</span>
00004 <span class="comment"> * Licensed under the Apache License, Version 2.0 (the "License");</span>
00005 <span class="comment"> * you may not use this file except in compliance with the License.</span>
00006 <span class="comment"> * You may obtain a copy of the License at</span>
00007 <span class="comment"> *</span>
00008 <span class="comment"> * http://www.apache.org/licenses/LICENSE-2.0</span>
00009 <span class="comment"> *</span>
00010 <span class="comment"> * Unless required by applicable law or agreed to in writing, software</span>
00011 <span class="comment"> * distributed under the License is distributed on an "AS IS" BASIS,</span>
00012 <span class="comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
00013 <span class="comment"> * See the License for the specific language governing permissions and</span>
00014 <span class="comment"> * limitations under the License.</span>
00015 <span class="comment"> */</span>
00016
00017 <span class="preprocessor">#ifndef APR_ATOMIC_H</span>
00018 <span class="preprocessor"></span><span class="preprocessor">#define APR_ATOMIC_H</span>
00019 <span class="preprocessor"></span><span class="comment"></span>
00020 <span class="comment">/**</span>
00021 <span class="comment"> * @file apr_atomic.h</span>
00022 <span class="comment"> * @brief APR Atomic Operations</span>
00023 <span class="comment"> */</span>
00024
00025 <span class="preprocessor">#include "apr.h"</span>
00026 <span class="preprocessor">#include "<a class="code" href="apr__pools_8h.html">apr_pools.h</a>"</span>
00027
00028 <span class="preprocessor">#ifdef __cplusplus</span>
00029 <span class="preprocessor"></span><span class="keyword">extern</span> <span class="stringliteral">"C"</span> {
00030 <span class="preprocessor">#endif</span>
00031 <span class="preprocessor"></span><span class="comment"></span>
00032 <span class="comment">/**</span>
00033 <span class="comment"> * @defgroup apr_atomic Atomic Operations</span>
00034 <span class="comment"> * @ingroup APR </span>
00035 <span class="comment"> * @{</span>
00036 <span class="comment"> */</span>
00037 <span class="comment"></span>
00038 <span class="comment">/**</span>
00039 <span class="comment"> * this function is required on some platforms to initialize the</span>
00040 <span class="comment"> * atomic operation's internal structures</span>
00041 <span class="comment"> * @param p pool</span>
00042 <span class="comment"> * @return APR_SUCCESS on successful completion</span>
00043 <span class="comment"> */</span>
00044 APR_DECLARE(apr_status_t) apr_atomic_init(apr_pool_t *p);
00045
00046 <span class="comment">/*</span>
00047 <span class="comment"> * Atomic operations on 32-bit values</span>
00048 <span class="comment"> * Note: Each of these functions internally implements a memory barrier</span>
00049 <span class="comment"> * on platforms that require it</span>
00050 <span class="comment"> */</span>
00051 <span class="comment"></span>
00052 <span class="comment">/**</span>
00053 <span class="comment"> * atomically read an apr_uint32_t from memory</span>
00054 <span class="comment"> * @param mem the pointer</span>
00055 <span class="comment"> */</span>
00056 APR_DECLARE(apr_uint32_t) apr_atomic_read32(volatile apr_uint32_t *mem);
00057 <span class="comment"></span>
00058 <span class="comment">/**</span>
00059 <span class="comment"> * atomically set an apr_uint32_t in memory</span>
00060 <span class="comment"> * @param mem pointer to the object</span>
00061 <span class="comment"> * @param val value that the object will assume</span>
00062 <span class="comment"> */</span>
00063 APR_DECLARE(<span class="keywordtype">void</span>) apr_atomic_set32(volatile apr_uint32_t *mem, apr_uint32_t val);
00064 <span class="comment"></span>
00065 <span class="comment">/**</span>
00066 <span class="comment"> * atomically add 'val' to an apr_uint32_t</span>
00067 <span class="comment"> * @param mem pointer to the object</span>
00068 <span class="comment"> * @param val amount to add</span>
00069 <span class="comment"> * @return old value pointed to by mem</span>
00070 <span class="comment"> */</span>
00071 APR_DECLARE(apr_uint32_t) apr_atomic_add32(volatile apr_uint32_t *mem, apr_uint32_t val);
00072 <span class="comment"></span>
00073 <span class="comment">/**</span>
00074 <span class="comment"> * atomically subtract 'val' from an apr_uint32_t</span>
00075 <span class="comment"> * @param mem pointer to the object</span>
00076 <span class="comment"> * @param val amount to subtract</span>
00077 <span class="comment"> */</span>
00078 APR_DECLARE(<span class="keywordtype">void</span>) apr_atomic_sub32(volatile apr_uint32_t *mem, apr_uint32_t val);
00079 <span class="comment"></span>
00080 <span class="comment">/**</span>
00081 <span class="comment"> * atomically increment an apr_uint32_t by 1</span>
00082 <span class="comment"> * @param mem pointer to the object</span>
00083 <span class="comment"> * @return old value pointed to by mem</span>
00084 <span class="comment"> */</span>
00085 APR_DECLARE(apr_uint32_t) apr_atomic_inc32(volatile apr_uint32_t *mem);
00086 <span class="comment"></span>
00087 <span class="comment">/**</span>
00088 <span class="comment"> * atomically decrement an apr_uint32_t by 1</span>
00089 <span class="comment"> * @param mem pointer to the atomic value</span>
00090 <span class="comment"> * @return zero if the value becomes zero on decrement, otherwise non-zero</span>
00091 <span class="comment"> */</span>
00092 APR_DECLARE(<span class="keywordtype">int</span>) apr_atomic_dec32(volatile apr_uint32_t *mem);
00093 <span class="comment"></span>
00094 <span class="comment">/**</span>
00095 <span class="comment"> * compare an apr_uint32_t's value with 'cmp'.</span>
00096 <span class="comment"> * If they are the same swap the value with 'with'</span>
00097 <span class="comment"> * @param mem pointer to the value</span>
00098 <span class="comment"> * @param with what to swap it with</span>
00099 <span class="comment"> * @param cmp the value to compare it to</span>
00100 <span class="comment"> * @return the old value of *mem</span>
00101 <span class="comment"> */</span>
00102 APR_DECLARE(apr_uint32_t) apr_atomic_cas32(volatile apr_uint32_t *mem, apr_uint32_t with,
00103 apr_uint32_t cmp);
00104 <span class="comment"></span>
00105 <span class="comment">/**</span>
00106 <span class="comment"> * exchange an apr_uint32_t's value with 'val'.</span>
00107 <span class="comment"> * @param mem pointer to the value</span>
00108 <span class="comment"> * @param val what to swap it with</span>
00109 <span class="comment"> * @return the old value of *mem</span>
00110 <span class="comment"> */</span>
00111 APR_DECLARE(apr_uint32_t) apr_atomic_xchg32(volatile apr_uint32_t *mem, apr_uint32_t val);
00112 <span class="comment"></span>
00113 <span class="comment">/**</span>
00114 <span class="comment"> * compare the pointer's value with cmp.</span>
00115 <span class="comment"> * If they are the same swap the value with 'with'</span>
00116 <span class="comment"> * @param mem pointer to the pointer</span>
00117 <span class="comment"> * @param with what to swap it with</span>
00118 <span class="comment"> * @param cmp the value to compare it to</span>
00119 <span class="comment"> * @return the old value of the pointer</span>
00120 <span class="comment"> */</span>
00121 APR_DECLARE(<span class="keywordtype">void</span>*) apr_atomic_casptr(volatile <span class="keywordtype">void</span> **mem, <span class="keywordtype">void</span> *with, const <span class="keywordtype">void</span> *cmp);
00122 <span class="comment"></span>
00123 <span class="comment">/** @} */</span>
00124
00125 #ifdef __cplusplus
00126 }
00127 #endif
00128
00129 #endif <span class="comment">/* !APR_ATOMIC_H */</span>
</div></pre><hr size="1"><address style="align: right;"><small>Generated on Mon Feb 7 13:18:24 2005 for Apache Portable Runtime by
<a href="../../../www.doxygen.org/index.html">
<img src="doxygen.png" alt="doxygen" align="middle" border=0 ></a> 1.3.7 </small></address>
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