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<title>async_work_group_copy</title>
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<div class="refentry">
<a id="id-1"></a>
<div class="titlepage"></div>
<div xmlns="" class="refnamediv">
<a xmlns="http://www.w3.org/1999/xhtml" id="async_work_group_copy"></a>
<h1>async_work_group_copy</h1>
<p>
Perform an async copy.
</p>
</div>
<div class="refsynopsisdiv">
<h2></h2>
<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="otherDataTypes.html" target="pagedisplay">event_t</a>
<strong class="fsfunc">
async_work_group_copy
</strong>
(</code>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="local.html" target="pagedisplay">__local</a> gentype <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*dst</var>, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td>const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="global.html" target="pagedisplay">__global</a> gentype <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*src</var>, </td>
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<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">num_gentypes</var>, </td>
</tr>
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<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">event_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">event</var><code>)</code></td>
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<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="otherDataTypes.html" target="pagedisplay">event_t</a>
<strong class="fsfunc">
async_work_group_copy
</strong>
(</code>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="global.html" target="pagedisplay">__global</a> gentype <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*dst</var>, </td>
</td>
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<td> </td>
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<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">num_gentypes</var>, </td>
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<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">event_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">event</var><code>)</code></td>
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</div>
<div class="refsect1">
<a id="description"></a>
<h2>Description</h2>
<p>
<code class="function">async_work_group_copy</code> performs an
async copy of <code class="varname">num_gentypes</code> <span class="type">gentype</span> elements from
<code class="varname">src</code> to <code class="varname">dst</code>. The async copy is performed by all
work-items in a work-group and this built-in function must therefore be encountered
by all work-items in a work-group executing the kernel with the same argument values;
otherwise the results are undefined.
This rule applies to ND-ranges implemented with uniform
and non-uniform work-groups.
</p>
<p>
Returns an event object that can be used by
<a class="citerefentry" href="wait_group_events.html"><span class="citerefentry"><span class="refentrytitle">wait_group_events</span></span></a> to
wait for the async copy to finish. The <code class="varname">event</code> argument can also be
used to associate the <code class="function">async_work_group_copy</code> with a previous
async copy allowing an event to be shared by multiple async copies; otherwise
<code class="varname">event</code> should be zero.
</p>
<p>
If <code class="varname">event</code> argument is not zero, the event object supplied in
<code class="varname">event</code> argument will be returned.
</p>
<p>
This function does not perform any implicit synchronization of source data such as
using a <a class="citerefentry" href="barrier.html"><span class="citerefentry"><span class="refentrytitle">barrier</span></span></a> before
performing the copy.
</p>
<p>
General information about async copy functions:
The generic type name <span class="type">gentype</span> indicates the built-in data
types <span class="type">char</span>, <span class="type">char{2|3|4|8|16}</span>, <span class="type">uchar</span>,
<span class="type">uchar{2|3|4|8|16}</span>, <span class="type">short</span>, <span class="type">short{2|3|4|8|16}</span>,
<span class="type">ushort</span>, <span class="type">ushort{2|3|4|8|16}</span>, <span class="type">int</span>,
<span class="type">int{2|3|4|8|16}</span>, <span class="type">uint</span>, <span class="type">uint{2|3|4|8|16}</span>,
<span class="type">long</span>, <span class="type">long{2|3|4|8|16}</span>, <span class="type">ulong</span>,
<span class="type">ulong{2|3|4|8|16}</span>, <span class="type">float</span>, <span class="type">float{2|3|4|8|16}</span>, or
<span class="type">double</span>, <span class="type">double{2|3|4|8|16}</span>
as the type for the arguments unless otherwise stated.
</p>
<p>
When extended by the
<a class="citerefentry" href="cl_khr_fp16.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_fp16</span></span></a> extension,
the generic type <span class="type">gentype<em class="replaceable"><code>n</code></em></span> is extended to
include <span class="type">half</span>, <span class="type">half2</span>, <span class="type">half3</span>, <span class="type">half4</span>,
<span class="type">half8</span>, and <span class="type">half16</span>.
</p>
<p>
The kernel must wait for the completion of all async copies using the
<code class="function">wait_group_events</code> built-in function before
exiting; otherwise the behavior is undefined.
</p>
</div>
<div class="refsect1">
<a id="notes"></a>
<h2>Notes</h2>
<p>
<code class="function">async_work_group_copy</code> and
<code class="function">async_work_group_strided_copy</code> for 3-component
vector types behave as <code class="function">async_work_group_copy</code> and
<code class="function">async_work_group_strided_copy</code> respectively for 4-component vector
types.
</p>
</div>
<div class="refsect1">
<a id="specification"></a>
<h2>Specification</h2>
<p>
<img src="pdficon_small1.gif" />
<a href="https://www.khronos.org/registry/cl/specs/opencl-2.1-openclc.pdf#page=100" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="asyncCopyFunctions.html"><span class="citerefentry"><span class="refentrytitle">Async Copy and Prefetch Functions</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 © 2007-2015 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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