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<title>clGetKernelWorkGroupInfo</title>
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<div class="refentry">
<a id="idm1"></a>
<div class="titlepage"></div>
<div xmlns="" class="refnamediv">
<a xmlns="http://www.w3.org/1999/xhtml" id="clGetKernelWorkGroupInfo"></a>
<h1>
clGetKernelWorkGroupInfo
</h1>
<p>
Returns information about the kernel object that may be specific to a device.
</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">cl_int</a>
<strong class="fsfunc">clGetKernelWorkGroupInfo</strong>
(</code>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="_top">cl_kernel</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">kernel</var>, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="_top">cl_device_id</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">device</var>, </td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_kernel_work_group_info" target="_top">cl_kernel_work_group_info</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">param_name</var>, </td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">param_value_size</var>, </td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">void</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*param_value</var>, </td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*param_value_size_ret</var><code>)</code></td>
</tr>
</table>
</div>
</div>
<div class="refsect1">
<a id="parameters"></a>
<h2>Parameters</h2>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
<code class="varname">
kernel
</code>
</span>
</dt>
<dd>
<p>
Specifies the kernel object being queried.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">
device
</code>
</span>
</dt>
<dd>
<p>
Identifies a specific device in the list of devices associated with <code class="varname">kernel</code>. The list of devices
is the list of devices in the OpenCL context that is associated with <code class="varname">kernel</code>. If the list of devices
associated with <code class="varname">kernel</code> is a single device, <code class="varname">device</code> can be a NULL value.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">
param_name
</code>
</span>
</dt>
<dd>
<p>
Specifies the information to query. The list of supported <code class="varname">param_name</code> types and the
information returned in <code class="varname">param_value</code> by <code class="function">clGetKernelWorkGroupInfo</code> is described in the table below.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">
param_value
</code>
</span>
</dt>
<dd>
<p>
A pointer to memory where the appropriate result being queried is returned. If <code class="varname">param_value</code> is NULL, it is ignored.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">
param_value_size
</code>
</span>
</dt>
<dd>
<p>
Used to specify the size in bytes of memory pointed to by <code class="varname">param_value</code>.
This size must be greater than or equal to size of return type as described in the table below.
</p>
<div class="informaltable">
<table class="informaltable" border="1">
<colgroup>
<col align="left" class="col1" />
<col align="left" class="col2" />
<col align="left" class="col3" />
</colgroup>
<thead>
<tr>
<th align="left">cl_kernel_work_group_info</th>
<th align="left">Return Type</th>
<th align="left">Info. returned in <code class="varname">param_value</code></th>
</tr>
</thead>
<tbody>
<tr>
<td align="left">
<code class="constant">CL_KERNEL_WORK_GROUP_SIZE</code>
</td>
<td align="left">size_t</td>
<td align="left">
This provides a mechanism for the
application to query the work-group size
that can be used to execute a kernel on a
specific device given by <code class="varname">device</code>. The
OpenCL implementation uses the
resource requirements of the kernel
(register usage etc.) to determine what
this work-group size should be.
</td>
</tr>
<tr>
<td align="left">
<code class="constant">CL_KERNEL_COMPILE_WORK_GROUP_SIZE</code>
</td>
<td align="left">size_t[3]</td>
<td align="left">
Returns the work-group size specified
by the
<code class="constant">__attribute__((reqd_work_gr
oup_size(X, Y, Z)))</code> qualifier.
See <a class="citerefentry" href="functionQualifiers.html"><span class="citerefentry"><span class="refentrytitle">Function Qualifiers</span></span></a>.
If the work-group size is not specified
using the above attribute qualifier (0, 0,
0) is returned.
</td>
</tr>
<tr>
<td align="left">
<code class="constant">CL_KERNEL_LOCAL_MEM_SIZE</code>
</td>
<td align="left">cl_ulong</td>
<td align="left">
<p>
Returns the amount of local memory in
bytes being used by a kernel. This
includes local memory that may be
needed by an implementation to execute
the kernel, variables declared inside the
kernel with the <a class="citerefentry" href="local.html"><span class="citerefentry"><span class="refentrytitle">__local</span></span></a> address
qualifier and local memory to be
allocated for arguments to the kernel
declared as pointers with the <a class="citerefentry" href="local.html"><span class="citerefentry"><span class="refentrytitle">__local</span></span></a>
address qualifier and whose size is
specified with <a class="citerefentry" href="clSetKernelArg.html"><span class="citerefentry"><span class="refentrytitle">clSetKernelArg</span></span></a>.
</p>
<p>
If the local memory size, for any pointer
argument to the kernel declared with the
<a class="citerefentry" href="local.html"><span class="citerefentry"><span class="refentrytitle">__local</span></span></a> address qualifier, is not
specified, its size is assumed to be 0.
</p>
</td>
</tr>
</tbody>
</table>
</div>
</dd>
<dt>
<span class="term">
<code class="varname">
param_value_size_ret
</code>
</span>
</dt>
<dd>
<p>
Returns the actual size in bytes of data copied to <code class="varname">param_value</code>. If <code class="varname">param_value_size_ret</code> is NULL, it is ignored.
</p>
</dd>
</dl>
</div>
</div>
<div class="refsect1">
<a id="errors"></a>
<h2>Errors</h2>
<p>
Returns <span class="errorname">CL_SUCCESS</span> if the function is executed successfully. Otherwise, it returns one of the following errors:
</p>
<div class="itemizedlist">
<ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_DEVICE</span> if <code class="varname">device</code> is not in the list of devices associated with <code class="varname">kernel</code> or if <code class="varname">device</code> is NULL but there is more than one device associated with <code class="varname">kernel</code>.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">param_name</code> is not valid, or if size in bytes specified by <code class="varname">param_value_size</code> is less than the size of return type as described in the table above and <code class="varname">param_value</code> is not NULL.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_KERNEL</span> if <code class="varname">kernel</code> is a not a valid kernel object.
</li>
</ul>
</div>
</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=106" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="clCreateKernel.html"><span class="citerefentry"><span class="refentrytitle">clCreateKernel</span></span></a>,
<a class="citerefentry" href="clCreateKernelsInProgram.html"><span class="citerefentry"><span class="refentrytitle">clCreateKernelsInProgram</span></span></a>,
<a class="citerefentry" href="clReleaseKernel.html"><span class="citerefentry"><span class="refentrytitle">clReleaseKernel</span></span></a>,
<a class="citerefentry" href="clRetainKernel.html"><span class="citerefentry"><span class="refentrytitle">clRetainKernel</span></span></a>,
<a class="citerefentry" href="clSetKernelArg.html"><span class="citerefentry"><span class="refentrytitle">clSetKernelArg</span></span></a>,
<a class="citerefentry" href="clGetKernelInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetKernelInfo</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
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"Materials"), to deal in the Materials without restriction, including
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