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<title>clGetContextInfo</title>
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<div class="refentry">
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<div class="titlepage"></div>
<div xmlns="" class="refnamediv">
<a xmlns="http://www.w3.org/1999/xhtml" id="clGetDeviceIDs"></a>
<h1>clGetContextInfo</h1>
<p>
Query information about a context.
</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="pagedisplay">cl_int</a>
<strong class="fsfunc">
clGetContextInfo
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_context</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">context</var>
, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_context_info" target="pagedisplay">cl_context_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="pagedisplay">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="pagedisplay">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="pagedisplay">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">context </code> </span>
</dt>
<dd>
<p>
Specifies the OpenCL context being queried.
</p>
</dd>
<dt>
<span class="term"> <code class="varname"> param_name </code> </span>
</dt>
<dd>
<p>
An enumeration constant that specifies the information to query.
The valid values for <code class="varname">param_name</code> are:
</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_context_info</th>
<th align="left">Return Type</th>
<th align="left">Information returned in param_value</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left">
<code class="constant">CL_CONTEXT_REFERENCE_COUNT</code>
</td>
<td align="left">cl_uint</td>
<td align="left">
Return the <code class="varname">context</code> reference count. The reference
count returned should be considered immediately stale. It is
unsuitable for general use in applications. This feature is
provided for identifying memory leaks.
</td>
</tr>
<tr>
<td align="left">
<code class="constant">CL_CONTEXT_NUM_DEVICES</code>
</td>
<td align="left">cl_uint</td>
<td align="left">
Return the number of devices in <code class="varname">context</code>.
</td>
</tr>
<tr>
<td align="left">
<code class="constant">CL_CONTEXT_DEVICES</code>
</td>
<td align="left">cl_device_id[]</td>
<td align="left">
Return the list of devices in <code class="varname">context</code>.
</td>
</tr>
<tr>
<td align="left">
<code class="constant">CL_CONTEXT_PROPERTIES</code>
</td>
<td align="left">cl_context_-
properties[]</td>
<td align="left">
Return the <code class="varname">properties</code> argument specified in
<a class="citerefentry" href="clCreateContext.html"><span class="citerefentry"><span class="refentrytitle">clCreateContext</span></span></a>
or
<a class="citerefentry" href="clCreateContextFromType.html"><span class="citerefentry"><span class="refentrytitle">clCreateContextFromType</span></span></a>.
<p>If the <code class="varname">properties</code> argument specified in
<a class="citerefentry" href="clCreateContext.html"><span class="citerefentry"><span class="refentrytitle">clCreateContext</span></span></a>
or
<a class="citerefentry" href="clCreateContextFromType.html"><span class="citerefentry"><span class="refentrytitle">clCreateContextFromType</span></span></a>
used to create <code class="varname">context</code> is not NULL,
the implementation must return the values specified in the
<code class="varname">properties</code> argument. </p>
<p> If the <code class="varname">properties</code> argument specified in
<a class="citerefentry" href="clCreateContext.html"><span class="citerefentry"><span class="refentrytitle">clCreateContext</span></span></a>
or
<a class="citerefentry" href="clCreateContextFromType.html"><span class="citerefentry"><span class="refentrytitle">clCreateContextFromType</span></span></a>
used to create <code class="varname">context</code> is NULL, the implementation
may return either a <code class="varname">param_value_size_ret</code>
of 0, i.e. there is no context property value to be returned
or can return a context property value of 0 (where 0 is used
to terminate the context properties list) in the memory that
<code class="varname">param_value</code> points to. </p>
</td>
</tr>
<tr>
<td align="left">
<code class="constant">CL_CONTEXT_D3D10_PREFER_-
SHARED_RESOURCES_KHR</code>
</td>
<td align="left">cl_bool</td>
<td align="left">
If the
<a class="citerefentry" href="cl_khr_d3d10_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_d3d10_sharing</span></span></a>
extension is enabled, returns <span class="errorname">CL_TRUE</span>
if Direct3D 10 resources created as shared by
setting <code class="varname">MiscFlags</code> to include
<code class="constant">D3D10_RESOURCE_MISC_SHARED</code> will perform faster
when shared with OpenCL, compared with resources which have not
set this flag. Otherwise returns <code class="constant">CL_FALSE</code>.
</td>
</tr>
<tr>
<td align="left">
<code class="constant">CL_CONTEXT_D3D11_PREFER_-
SHARED_RESOURCES_KHR</code>
</td>
<td align="left">cl_bool</td>
<td align="left">
If the cl_khr_d3d11_sharing extension is supported, Returns
<code class="constant">CL_TRUE</code> if Direct3D 11 resources created
as shared by setting <code class="varname">MiscFlags</code> to include
<code class="constant">D3D11_RESOURCE_MISC_SHARED</code> will perform faster
when shared with OpenCL, compared with resources which have not
set this flag. Otherwise returns <code class="constant">CL_FALSE</code>.
</td>
</tr>
</tbody>
</table>
</div>
</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>
Specifies the size in bytes of memory
pointed to by <code class="varname">param_value</code>. This size must be greater
than or equal to the size of return type as described in the table above.
</p>
</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 being queried by <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 executed successfully,
or one of the errors below:
</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_CONTEXT</span> if <code class="varname">context</code>
is not a valid context.
</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 one of the supported values or if size in bytes specified by
<code class="varname">param_value_size</code> is < size of return type as specified in the
table above and <code class="varname">param_value</code> is not a <span class="errorname">NULL</span>
value.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_RESOURCES</span> if there is a failure to allocate
resources required by the OpenCL implementation on the device.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_HOST_MEMORY</span> if there is a failure to allocate
resources required by the OpenCL implementation on the host.
</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-1.2.pdf#page=58" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</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 © 2007-2011 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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