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| <title>barrier</title> |
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| <body> |
| <div class="refentry"> |
| <a id="idm1"></a> |
| <div class="titlepage"></div> |
| <div xmlns="" class="refnamediv"> |
| <a xmlns="http://www.w3.org/1999/xhtml" id="barrier"></a> |
| <h1>barrier</h1> |
| <p> |
| All work-items in a work-group executing the kernel on a processor must execute this function before any are allowed to continue execution beyond the barrier. |
| </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="_top">void</a> |
| <strong class="fsfunc"> |
| barrier |
| </strong> |
| (</code> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="_top">cl_mem</a>_fence_flags <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">flags</var><code>)</code></td> |
| </td> |
| </tr> |
| </table> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="description"></a> |
| <h2>Description</h2> |
| <p> |
| All work-items in a work-group executing the kernel |
| on a processor must execute this function before any |
| are allowed to continue execution beyond the barrier. |
| This function must be encountered by all work-items in |
| a work-group executing the kernel. |
| </p> |
| <p> |
| </p> |
| <p> |
| If <code class="function">barrier</code> is inside a conditional statement, then all |
| work-items must enter the conditional if any work-item |
| enters the conditional statement and executes the |
| <code class="function">barrier</code>. |
| </p> |
| <p> |
| </p> |
| <p> |
| If <code class="function">barrier</code> is inside a loop, all work-items must execute |
| the <code class="function">barrier</code> for each iteration of the loop before any are |
| allowed to continue execution beyond the <code class="function">barrier</code>. |
| </p> |
| <p> |
| </p> |
| <p> |
| The <code class="function">barrier</code> function also queues a memory fence |
| (reads and writes) to ensure correct ordering of |
| memory operations to local or global memory. |
| </p> |
| <p> |
| </p> |
| <p> |
| The <code class="varname">flags</code> argument specifies the memory address space |
| and can be set to a combination of the following literal |
| values. |
| </p> |
| <p> |
| </p> |
| <p> |
| CLK_LOCAL_MEM_FENCE - The <code class="function">barrier</code> function |
| will either flush any variables stored in local memory |
| or queue a memory fence to ensure correct ordering of |
| memory operations to local memory. |
| </p> |
| <p> |
| </p> |
| <p> |
| CLK_GLOBAL_MEM_FENCE - The <code class="function">barrier</code> function |
| will queue a memory fence to ensure correct ordering |
| of memory operations to global memory. This can be |
| useful when work-items, for example, write to buffer or |
| image objects and then want to read the updated data. |
| </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=199" 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 © 2007-2009 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 |
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| 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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