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    <title>cl_khr_global_int32_base_atomics</title>
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        <a xmlns="http://www.w3.org/1999/xhtml" id="cl_khr_global_int32_base_atomics"></a>
        <h1>cl_khr_global_int32_base_atomics</h1>
        <p>
            Optional extensions that implement atomic operations
on 32-bit signed and unsigned integers to locations in __global memory. 
        </p>
      </div>
      <div class="refsect2">
        <a id="synopsis"></a>
        <h3>
        </h3>
        <div class="informaltable">
          <table class="informaltable" border="0">
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              <col align="left" class="col1" />
            </colgroup>
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                <td align="left">
#pragma OPENCL EXTENSION cl_khr_global_int32_base_atomics : enable
                        </td>
              </tr>
            </tbody>
          </table>
        </div>
      </div>
      <div class="refsect1">
        <a id="description"></a>
        <h2>Description</h2>
        <p>
An application that wants to use this extension will need to include the <code class="function">#pragma
OPENCL EXTENSION cl_khr_global_int32_base_atomics : enable</code> directive in the OpenCL program source.
        </p>
        <p>
The atomic functions supported by the <code class="function">cl_khr_global_int32_base_atomics</code> extension are
described in the following table. All of the functions listed in the following table are performed in one atomic transaction.
        </p>
        <p>
These transactions are atomic for the device executing these atomic functions. There is no
guarantee of atomicity if the atomic operations to the same memory location are being performed
by kernels executing on multiple devices.
        </p>
        <div class="informaltable">
          <table class="informaltable" border="1">
            <colgroup>
              <col align="left" class="col1" />
              <col align="left" class="col2" />
            </colgroup>
            <thead>
              <tr>
                <th align="left">Function</th>
                <th align="left">Description</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td align="left"><p>int <code class="function">atom_add</code> (__global int *<code class="varname">p</code>, int <code class="varname">val</code>)</p>
<div class="literallayout"><p>unsigned int <code class="function">atom_add</code> (__global unsigned int *<code class="varname">p</code>,<br />
          unsigned int <code class="varname">val</code>)</p></div></td>
                <td align="left">
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>.
                        </td>
              </tr>
              <tr>
                <td align="left"><p>int <code class="function">atom_sub</code> (__global int *<code class="varname">p</code>, int <code class="varname">val</code>)</p>
<div class="literallayout"><p>unsigned int <code class="function">atom_sub</code> (__global unsigned int *<code class="varname">p</code>,<br />
          unsigned int <code class="varname">val</code>)</p></div></td>
                <td align="left">
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>.
                        </td>
              </tr>
              <tr>
                <td align="left"><p>int <code class="function">atom_xchg</code> (__global int *<code class="varname">p</code>, int <code class="varname">val</code>)</p>
<div class="literallayout"><p>unsigned int <code class="function">atom_xchg</code> (__global unsigned int *<code class="varname">p</code>,<br />
          unsigned int <code class="varname">val</code>)</p></div></td>
                <td align="left">
Swaps the <code class="varname">old</code> value
stored at location <code class="varname">p</code> with new value given by
<code class="varname">val</code>). Returns <code class="varname">old</code> value.
                        </td>
              </tr>
              <tr>
                <td align="left"><p>int <code class="function">atom_inc</code> (__global int *<code class="varname">p</code>)</p>
<div class="literallayout"><p>unsigned int <code class="function">atom_inc</code> (__global unsigned int *<code class="varname">p</code>)</p></div></td>
                <td align="left">
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> + 1) and store result at location
pointed by <code class="varname">p</code>. The function returns <code class="varname">old</code>.
                        </td>
              </tr>
              <tr>
                <td align="left"><p>int <code class="function">atom_dec</code> (__global int *<code class="varname">p</code>)</p>
<div class="literallayout"><p>unsigned int <code class="function">atom_dec</code> (__global unsigned int *<code class="varname">p</code>)</p></div></td>
                <td align="left">
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> - 1) and store result at location
pointed by <code class="varname">p</code>. The function returns <code class="varname">old</code>.
                        </td>
              </tr>
              <tr>
                <td align="left"><p>int <code class="function">atom_cmpxchg</code> (__global int *<code class="varname">p</code>,
                  int<code class="varname">cmp</code>, int <code class="varname">val</code>)</p>
<div class="literallayout"><p>unsigned int <code class="function">atom_cmpxchg</code> (__global unsigned int *<code class="varname">p</code>,<br />
          unsigned int <code class="varname">cmp</code>,<br />
          unsigned int <code class="varname">val</code>)</p></div></td>
                <td align="left">
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">cmp</code>) ? <code class="varname">val</code> : <code class="varname">old</code> and store result at location pointed by <code class="varname">p</code>. The function returns <code class="varname">old</code>.
                        </td>
              </tr>
            </tbody>
          </table>
        </div>
        <p>
        </p>
        <p>
        </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-1.0.pdf#page=244" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
            <a class="citerefentry" href="EXTENSION.html"><span class="citerefentry"><span class="refentrytitle">EXTENSION</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 © 2007-2009 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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