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    <title>Atomic Functions</title>
    <meta name="generator" content="DocBook XSL Stylesheets V1.78.1" />
    <meta name="keywords" content="Atomic Functions" />
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    <div class="refentry">
      <a id="id-1"></a>
      <div class="titlepage"></div>
      <div xmlns="" class="refnamediv">
        <h1>Atomic Functions</h1>
        <p>
The atomic functions are shown below.
Click an item in the table below for details about that function.
        </p>
      </div>
      <div class="refsect1">
        <a id="springboard"></a>
        <h2></h2>
        <div class="informaltable">
          <table border="1">
            <colgroup>
              <col align="left" class="col1" />
              <col align="left" class="col2" />
              <col align="left" class="col3" />
              <col align="left" class="col4" />
            </colgroup>
            <tbody>
              <tr>
                <td align="left">
                <a class="citerefentry" href="atomic_add.html"><span class="citerefentry"><span class="refentrytitle">atomic_add</span></span></a>
            </td>
                <td align="left">
                <a class="citerefentry" href="atomic_sub.html"><span class="citerefentry"><span class="refentrytitle">atomic_sub</span></span></a>
            </td>
                <td align="left">
                <a class="citerefentry" href="atomic_xchg.html"><span class="citerefentry"><span class="refentrytitle">atomic_xchg</span></span></a>
            </td>
                <td align="left">
                <a class="citerefentry" href="atomic_inc.html"><span class="citerefentry"><span class="refentrytitle">atomic_inc</span></span></a>
            </td>
              </tr>
              <tr>
                <td align="left">
                <a class="citerefentry" href="atomic_dec.html"><span class="citerefentry"><span class="refentrytitle">atomic_dec</span></span></a>
            </td>
                <td align="left">
                <a class="citerefentry" href="atomic_cmpxchg.html"><span class="citerefentry"><span class="refentrytitle">atomic_cmpxchg</span></span></a>
            </td>
                <td align="left">
                <a class="citerefentry" href="atomic_min.html"><span class="citerefentry"><span class="refentrytitle">atomic_min</span></span></a>
            </td>
                <td align="left">
                <a class="citerefentry" href="atomic_max.html"><span class="citerefentry"><span class="refentrytitle">atomic_max</span></span></a>
            </td>
              </tr>
              <tr>
                <td align="left">
                <a class="citerefentry" href="atomic_and.html"><span class="citerefentry"><span class="refentrytitle">atomic_and</span></span></a>
            </td>
                <td align="left">
                <a class="citerefentry" href="atomic_or.html"><span class="citerefentry"><span class="refentrytitle">atomic_or</span></span></a>
            </td>
                <td align="left">
                <a class="citerefentry" href="atomic_xor.html"><span class="citerefentry"><span class="refentrytitle">atomic_xor</span></span></a>
            </td>
                <td align="left">
            </td>
              </tr>
            </tbody>
          </table>
        </div>
        <p>
      The <a class="citerefentry" href="cl_khr_int64_base_atomics.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_int64_base_atomics</span></span></a>
      extension enables additional atomic functions using types <span class="type">long</span>
      and <span class="type">unsigned long</span>.  An application that wants to use
      this extension will need to include the <code class="code">#pragma OPENCL EXTENSION
      <a class="citerefentry" href="cl_khr_int64_base_atomics.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_int64_base_atomics</span></span></a> :
      enable</code> in the OpenCL program source.
    </p>
        <div class="informaltable">
          <table border="1">
            <colgroup>
              <col align="left" class="col1" />
              <col align="left" class="col2" />
              <col align="left" class="col3" />
              <col align="left" class="col4" />
            </colgroup>
            <tbody>
              <tr>
                <td align="left">
                <a class="citerefentry" href="atom_add.html"><span class="citerefentry"><span class="refentrytitle">atom_add</span></span></a>
            </td>
                <td align="left">
                <a class="citerefentry" href="atom_sub.html"><span class="citerefentry"><span class="refentrytitle">atom_sub</span></span></a>
            </td>
                <td align="left">
                <a class="citerefentry" href="atom_xchg.html"><span class="citerefentry"><span class="refentrytitle">atom_xchg</span></span></a>
            </td>
                <td align="left">
                <a class="citerefentry" href="atom_inc.html"><span class="citerefentry"><span class="refentrytitle">atom_inc</span></span></a>
            </td>
              </tr>
              <tr>
                <td align="left">
                <a class="citerefentry" href="atom_dec.html"><span class="citerefentry"><span class="refentrytitle">atom_dec</span></span></a>
            </td>
                <td align="left">
                <a class="citerefentry" href="atom_cmpxchg.html"><span class="citerefentry"><span class="refentrytitle">atom_cmpxchg</span></span></a>
            </td>
                <td class="auto-generated"> </td>
                <td class="auto-generated"> </td>
              </tr>
            </tbody>
          </table>
        </div>
        <p>
      The <a class="citerefentry" href="cl_khr_int64_extended_atomics.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_int64_extended_atomics</span></span></a>
      extension enables additional atomic functions using types <span class="type">long</span>
      and <span class="type">unsigned long</span>.  An application that wants to use
      this extension will need to include the <code class="code">#pragma OPENCL EXTENSION
      <a class="citerefentry" href="cl_khr_int64_extended_atomics.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_int64_extended_atomics</span></span></a>
      : enable</code> in the OpenCL program source.
    </p>
        <div class="informaltable">
          <table border="1">
            <colgroup>
              <col align="left" class="col1" />
              <col align="left" class="col2" />
              <col align="left" class="col3" />
            </colgroup>
            <tbody>
              <tr>
                <td align="left">
                <a class="citerefentry" href="atom_min.html"><span class="citerefentry"><span class="refentrytitle">atom_min</span></span></a>
            </td>
                <td align="left">
                <a class="citerefentry" href="atom_max.html"><span class="citerefentry"><span class="refentrytitle">atom_max</span></span></a>
            </td>
                <td align="left">
                <a class="citerefentry" href="atom_xor.html"><span class="citerefentry"><span class="refentrytitle">atom_xor</span></span></a>
            </td>
              </tr>
              <tr>
                <td align="left">
                <a class="citerefentry" href="atom_and.html"><span class="citerefentry"><span class="refentrytitle">atom_and</span></span></a>
            </td>
                <td align="left">
                <a class="citerefentry" href="atom_or.html"><span class="citerefentry"><span class="refentrytitle">atom_or</span></span></a>
            </td>
                <td class="auto-generated"> </td>
              </tr>
            </tbody>
          </table>
        </div>
      </div>
      <div class="refsect1">
        <a id="description"></a>
        <h2>Description</h2>
        <p>
          These functions provide atomic operations on 32-bit signed, unsigned
          integers and single precision floating-point to locations in <a class="citerefentry" href="global.html"><span class="citerefentry"><span class="refentrytitle">__global</span></span></a> or <a class="citerefentry" href="local.html"><span class="citerefentry"><span class="refentrytitle">__local</span></span></a> memory.  Only the
          <code class="function">atomic_xchg</code> operation is supported for single precision
          floating-point data type.
        </p>
        <p>
          The atomic built-in functions that use the <code class="constant">atom_</code> prefix and are
          described in the <a href="http://www.khronos.org/registry/cl/specs/opencl-1.2-extensions.pdf#page=10" target="OpenCL Spec">OpenCL Extension Specification</a> and are
          enabled by: cl_khr_global_int32_base_atomics, cl_khr_global_int32_extended_atomics,
          cl_khr_local_int32_base_atomics, and cl_khr_local_int32_extended_atomics in sections
          9.5 and 9.6 of the OpenCL 1.0 specification are also supported.  .
        </p>
        <p>
          The 64-bit 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>
      <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 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
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