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<h1>Atomic Operations<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></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#g4cf2ddae3efce70c508ac7fefc1c47f7">apr_status_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__atomic.html#gbe2b498dae686f68a67f676130b9aa23">apr_atomic_init</a> (<a class="el" href="group__apr__pools.html#g06f17a7732f2d04d8ce7010fbb057a8b">apr_pool_t</a> *p)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">apr_uint32_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__atomic.html#g617533320c72e324765b1a114e6f88ba">apr_atomic_read32</a> (volatile apr_uint32_t *mem)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__atomic.html#g406ecb97d6beb6d8c5574e3a75900efe">apr_atomic_set32</a> (volatile apr_uint32_t *mem, apr_uint32_t val)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">apr_uint32_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__atomic.html#g86030e8f8f7915f74b0f172e91f1994d">apr_atomic_add32</a> (volatile apr_uint32_t *mem, apr_uint32_t val)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__atomic.html#g2504e42aaef47c770f9a7d2bfbf9122b">apr_atomic_sub32</a> (volatile apr_uint32_t *mem, apr_uint32_t val)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">apr_uint32_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__atomic.html#g8689c6c810716f9947edc16847ba6461">apr_atomic_inc32</a> (volatile apr_uint32_t *mem)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__atomic.html#g9f9b830560833ab0e7b48144b5902981">apr_atomic_dec32</a> (volatile apr_uint32_t *mem)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">apr_uint32_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__atomic.html#g2b965b3bce1b8ba0e0cbe323a877639a">apr_atomic_cas32</a> (volatile apr_uint32_t *mem, apr_uint32_t with, apr_uint32_t cmp)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">apr_uint32_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__atomic.html#g8e0f6b1ed6b8fa8a091affe81c33a386">apr_atomic_xchg32</a> (volatile apr_uint32_t *mem, apr_uint32_t val)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__atomic.html#g2847b3d12299c2ca5f055ffdc6ec3031">apr_atomic_casptr</a> (volatile void **mem, void *with, const void *cmp)</td></tr>
</table>
<hr><h2>Function Documentation</h2>
<a class="anchor" name="g86030e8f8f7915f74b0f172e91f1994d"></a><!-- doxytag: member="apr_atomic.h::apr_atomic_add32" ref="g86030e8f8f7915f74b0f172e91f1994d" args="(volatile apr_uint32_t *mem, apr_uint32_t val)" -->
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<td class="memname">apr_uint32_t apr_atomic_add32 </td>
<td>(</td>
<td class="paramtype">volatile apr_uint32_t * </td>
<td class="paramname"> <em>mem</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">apr_uint32_t </td>
<td class="paramname"> <em>val</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
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<div class="memdoc">
<p>
atomically add 'val' to an apr_uint32_t <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>mem</em> </td><td>pointer to the object </td></tr>
<tr><td valign="top"></td><td valign="top"><em>val</em> </td><td>amount to add </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>old value pointed to by mem </dd></dl>
</div>
</div><p>
<a class="anchor" name="g2b965b3bce1b8ba0e0cbe323a877639a"></a><!-- doxytag: member="apr_atomic.h::apr_atomic_cas32" ref="g2b965b3bce1b8ba0e0cbe323a877639a" args="(volatile apr_uint32_t *mem, apr_uint32_t with, apr_uint32_t cmp)" -->
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<td class="memname">apr_uint32_t apr_atomic_cas32 </td>
<td>(</td>
<td class="paramtype">volatile apr_uint32_t * </td>
<td class="paramname"> <em>mem</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">apr_uint32_t </td>
<td class="paramname"> <em>with</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">apr_uint32_t </td>
<td class="paramname"> <em>cmp</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
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</div>
<div class="memdoc">
<p>
compare an apr_uint32_t's value with 'cmp'. If they are the same swap the value with 'with' <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>mem</em> </td><td>pointer to the value </td></tr>
<tr><td valign="top"></td><td valign="top"><em>with</em> </td><td>what to swap it with </td></tr>
<tr><td valign="top"></td><td valign="top"><em>cmp</em> </td><td>the value to compare it to </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>the old value of *mem </dd></dl>
</div>
</div><p>
<a class="anchor" name="g2847b3d12299c2ca5f055ffdc6ec3031"></a><!-- doxytag: member="apr_atomic.h::apr_atomic_casptr" ref="g2847b3d12299c2ca5f055ffdc6ec3031" args="(volatile void **mem, void *with, const void *cmp)" -->
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<td class="memname">void* apr_atomic_casptr </td>
<td>(</td>
<td class="paramtype">volatile void ** </td>
<td class="paramname"> <em>mem</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"> <em>with</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const void * </td>
<td class="paramname"> <em>cmp</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
compare the pointer's value with cmp. If they are the same swap the value with 'with' <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>mem</em> </td><td>pointer to the pointer </td></tr>
<tr><td valign="top"></td><td valign="top"><em>with</em> </td><td>what to swap it with </td></tr>
<tr><td valign="top"></td><td valign="top"><em>cmp</em> </td><td>the value to compare it to </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>the old value of the pointer </dd></dl>
</div>
</div><p>
<a class="anchor" name="g9f9b830560833ab0e7b48144b5902981"></a><!-- doxytag: member="apr_atomic.h::apr_atomic_dec32" ref="g9f9b830560833ab0e7b48144b5902981" args="(volatile apr_uint32_t *mem)" -->
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<td class="memname">int apr_atomic_dec32 </td>
<td>(</td>
<td class="paramtype">volatile apr_uint32_t * </td>
<td class="paramname"> <em>mem</em> </td>
<td> ) </td>
<td width="100%"></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
atomically decrement an apr_uint32_t by 1 <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>mem</em> </td><td>pointer to the atomic value </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>zero if the value becomes zero on decrement, otherwise non-zero </dd></dl>
</div>
</div><p>
<a class="anchor" name="g8689c6c810716f9947edc16847ba6461"></a><!-- doxytag: member="apr_atomic.h::apr_atomic_inc32" ref="g8689c6c810716f9947edc16847ba6461" args="(volatile apr_uint32_t *mem)" -->
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<div class="memproto">
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<td class="memname">apr_uint32_t apr_atomic_inc32 </td>
<td>(</td>
<td class="paramtype">volatile apr_uint32_t * </td>
<td class="paramname"> <em>mem</em> </td>
<td> ) </td>
<td width="100%"></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
atomically increment an apr_uint32_t by 1 <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>mem</em> </td><td>pointer to the object </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>old value pointed to by mem </dd></dl>
</div>
</div><p>
<a class="anchor" name="gbe2b498dae686f68a67f676130b9aa23"></a><!-- doxytag: member="apr_atomic.h::apr_atomic_init" ref="gbe2b498dae686f68a67f676130b9aa23" args="(apr_pool_t *p)" -->
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<td class="memname"><a class="el" href="group__apr__errno.html#g4cf2ddae3efce70c508ac7fefc1c47f7">apr_status_t</a> apr_atomic_init </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__apr__pools.html#g06f17a7732f2d04d8ce7010fbb057a8b">apr_pool_t</a> * </td>
<td class="paramname"> <em>p</em> </td>
<td> ) </td>
<td width="100%"></td>
</tr>
</table>
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<p>
this function is required on some platforms to initialize the atomic operation's internal structures <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>p</em> </td><td>pool </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>APR_SUCCESS on successful completion </dd></dl>
</div>
</div><p>
<a class="anchor" name="g617533320c72e324765b1a114e6f88ba"></a><!-- doxytag: member="apr_atomic.h::apr_atomic_read32" ref="g617533320c72e324765b1a114e6f88ba" args="(volatile apr_uint32_t *mem)" -->
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<td class="memname">apr_uint32_t apr_atomic_read32 </td>
<td>(</td>
<td class="paramtype">volatile apr_uint32_t * </td>
<td class="paramname"> <em>mem</em> </td>
<td> ) </td>
<td width="100%"></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
atomically read an apr_uint32_t from memory <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>mem</em> </td><td>the pointer </td></tr>
</table>
</dl>
</div>
</div><p>
<a class="anchor" name="g406ecb97d6beb6d8c5574e3a75900efe"></a><!-- doxytag: member="apr_atomic.h::apr_atomic_set32" ref="g406ecb97d6beb6d8c5574e3a75900efe" args="(volatile apr_uint32_t *mem, apr_uint32_t val)" -->
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<td class="memname">void apr_atomic_set32 </td>
<td>(</td>
<td class="paramtype">volatile apr_uint32_t * </td>
<td class="paramname"> <em>mem</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">apr_uint32_t </td>
<td class="paramname"> <em>val</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
atomically set an apr_uint32_t in memory <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>mem</em> </td><td>pointer to the object </td></tr>
<tr><td valign="top"></td><td valign="top"><em>val</em> </td><td>value that the object will assume </td></tr>
</table>
</dl>
</div>
</div><p>
<a class="anchor" name="g2504e42aaef47c770f9a7d2bfbf9122b"></a><!-- doxytag: member="apr_atomic.h::apr_atomic_sub32" ref="g2504e42aaef47c770f9a7d2bfbf9122b" args="(volatile apr_uint32_t *mem, apr_uint32_t val)" -->
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<td class="memname">void apr_atomic_sub32 </td>
<td>(</td>
<td class="paramtype">volatile apr_uint32_t * </td>
<td class="paramname"> <em>mem</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">apr_uint32_t </td>
<td class="paramname"> <em>val</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
atomically subtract 'val' from an apr_uint32_t <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>mem</em> </td><td>pointer to the object </td></tr>
<tr><td valign="top"></td><td valign="top"><em>val</em> </td><td>amount to subtract </td></tr>
</table>
</dl>
</div>
</div><p>
<a class="anchor" name="g8e0f6b1ed6b8fa8a091affe81c33a386"></a><!-- doxytag: member="apr_atomic.h::apr_atomic_xchg32" ref="g8e0f6b1ed6b8fa8a091affe81c33a386" args="(volatile apr_uint32_t *mem, apr_uint32_t val)" -->
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<td class="memname">apr_uint32_t apr_atomic_xchg32 </td>
<td>(</td>
<td class="paramtype">volatile apr_uint32_t * </td>
<td class="paramname"> <em>mem</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">apr_uint32_t </td>
<td class="paramname"> <em>val</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
</tr>
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<div class="memdoc">
<p>
exchange an apr_uint32_t's value with 'val'. <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>mem</em> </td><td>pointer to the value </td></tr>
<tr><td valign="top"></td><td valign="top"><em>val</em> </td><td>what to swap it with </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>the old value of *mem </dd></dl>
</div>
</div><p>
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