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<title>atomic_sub</title>
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<body>
<div class="refentry">
<a id="idp35696944"></a>
<div class="titlepage"></div>
<div xmlns="" class="refnamediv">
<a xmlns="http://www.w3.org/1999/xhtml" id="atomic_sub"></a>
<h1>atomic_sub</h1>
<p>
atomic_sub functions.
</p>
</div>
<div class="refsynopsisdiv">
<h2></h2>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">int</a>
<strong class="fsfunc">
atomic_sub
</strong>
(</code>
<td>
volatile __global
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">int</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*p</var>
, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">int</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">val</var><code>)</code></td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">unsigned int</a>
<strong class="fsfunc">
atomic_sub
</strong>
(</code>
<td>
volatile __global
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">unsigned int</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*p</var>
, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">unsigned int</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">val</var><code>)</code></td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
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<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">int</a>
<strong class="fsfunc">
atomic_sub
</strong>
(</code>
<td>
volatile __local
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">int</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*p</var>
, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">int</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">val</var><code>)</code></td>
</tr>
</table>
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<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">unsigned int</a>
<strong class="fsfunc">
atomic_sub
</strong>
(</code>
<td>
volatile __local
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">unsigned int</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*p</var>
, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">unsigned int</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">val</var><code>)</code></td>
</tr>
</table>
</div>
</div>
<div class="refsect1">
<a id="description"></a>
<h2>Description</h2>
<p>
Read the 32-bit value (referred to as <code class="varname">old</code>) stored at location pointed
by <code class="varname">p</code>. Compute (<code class="varname">old</code> - <code class="varname">val</code>)
and store result at location pointed by <code class="varname">p</code>. The function returns
<code class="varname">old</code>.
</p>
<p>
A 64-bit version of this function,
<a class="citerefentry" href="atom_sub.html"><span class="citerefentry"><span class="refentrytitle">atom_sub</span></span></a>, is enabled by
<a class="citerefentry" href="cl_khr_int64_base_atomics.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_int64_base_atomics</span></span></a>.
</p>
</div>
<div class="refsect1">
<a id="specification"></a>
<h2>Specification</h2>
<p>
<img src="pdficon_small1.gif" />
<a href="http://www.khronos.org/registry/cl/specs/opencl-1.2.pdf#page=279" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="atomicFunctions.html"><span class="citerefentry"><span class="refentrytitle">Atomic Functions</span></span></a>,
<a class="citerefentry" href="atom_sub.html"><span class="citerefentry"><span class="refentrytitle">atom_sub</span></span></a>
</p>
</div>
<div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2011 The Khronos Group Inc.
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
permit persons to whom the Materials are furnished to do so, subject to
the condition that this copyright notice and permission notice shall be included
in all copies or substantial portions of the Materials.
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