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| <title>Atomic Functions</title> |
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| <meta name="keywords" content="Atomic Functions" /> |
| </head> |
| <body> |
| <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. |
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| 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 |
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