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<title>clGetDeviceIDs</title>
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<meta name="keywords" content="clGetDeviceIDs" />
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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="clGetDeviceIDs"></a>
<h1>clGetDeviceIDs</h1>
<p>Obtain the list of devices available on a platform.</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">clGetDeviceIDs</strong>(</code>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="_top">cl_platform_id</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">platform</var>, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#device_type" target="_top">cl_device_type</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">device_type</var>, </td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">cl_uint</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">num_entries</var>, </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">*devices</var>, </td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">cl_uint</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*num_devices</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">platform</code>
</span>
</dt>
<dd>
<p>
Refers to the platform ID returned by <a class="citerefentry" href="clGetPlatformIDs.html"><span class="citerefentry"><span class="refentrytitle">clGetPlatformIDs</span></span></a> or can be NULL. If <code class="varname">platform</code> is NULL, the behavior is implementation-defined.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">device_type</code>
</span>
</dt>
<dd>
<p>
A bitfield that identifies the type of OpenCL device. The <code class="varname">device_type</code> can be used to query specific OpenCL devices or all OpenCL devices available. The valid values for <code class="varname">device_type</code> are specified in the following table.
</p>
<div class="informaltable">
<table class="informaltable" border="1">
<colgroup>
<col align="left" class="col1" />
<col align="left" class="col2" />
</colgroup>
<thead>
<tr>
<th align="left">cl_device_type</th>
<th align="left">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left">
<code class="constant">CL_DEVICE_TYPE_CPU</code>
</td>
<td align="left">An OpenCL device that is the host processor. The host
processor runs the OpenCL implementations and is a
single or multi-core CPU.</td>
</tr>
<tr>
<td align="left">
<code class="constant">CL_DEVICE_TYPE_GPU</code>
</td>
<td align="left">An OpenCL device that is a GPU. By this we mean that
the device can also be used to accelerate a 3D API such
as OpenGL or DirectX.</td>
</tr>
<tr>
<td align="left">
<code class="constant">CL_DEVICE_TYPE_ACCELERATOR</code>
</td>
<td align="left">Dedicated OpenCL accelerators (for example the IBM
CELL Blade). These devices communicate with the host
processor using a peripheral interconnect such as PCIe.</td>
</tr>
<tr>
<td align="left">
<code class="constant">CL_DEVICE_TYPE_DEFAULT</code>
</td>
<td align="left">The default OpenCL device in the system.</td>
</tr>
<tr>
<td align="left">
<code class="constant">CL_DEVICE_TYPE_ALL</code>
</td>
<td align="left">All OpenCL devices available in the system.</td>
</tr>
</tbody>
</table>
</div>
</dd>
<dt>
<span class="term">
<code class="varname">num_entries</code>
</span>
</dt>
<dd>
<p>
The number of cl_device entries that can be added to <code class="varname">devices</code>. If <code class="varname">devices</code> is not NULL, the <code class="varname">num_entries</code> must be greater than zero.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">devices</code>
</span>
</dt>
<dd>
<p>
A list of OpenCL devices found. The cl_device_id values returned in <code class="varname">devices</code> can be used to identify a specific OpenCL device. If <code class="varname">devices</code> argument is NULL, this argument is ignored. The number of OpenCL devices returned is the mininum of the value specified by <code class="varname">num_entries</code> or the number of OpenCL devices whose type matches <code class="varname">device_type</code>.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">num_devices</code>
</span>
</dt>
<dd>
<p>
The number of OpenCL devices available that match <code class="varname">device_type</code>. If <code class="varname">num_devices</code> is NULL, this argument is ignored.
</p>
</dd>
</dl>
</div>
</div>
<div class="refsect1">
<a id="notes"></a>
<h2>Notes</h2>
<p><code class="function">clGetDeviceIDs</code> may return all or a subset of the actual physical devices present in the platform and that match <code class="varname">device_type</code>.</p>
<p>
The application can query specific capabilities of the OpenCL device(s) returned by <code class="function">clGetDeviceIDs</code>. This can be used by the application to determine which device(s) to use.</p>
</div>
<div class="refsect1">
<a id="errors"></a>
<h2>Errors</h2>
<p><code class="function">clGetDeviceIDs</code> returns <span class="errorname">CL_SUCCESS</span> if the function is executed successfully. Otherwise it returns the following:
</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_PLATFORM</span> if <code class="varname">platform</code> is not a valid platform.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_DEVICE_TYPE</span> if <code class="varname">device_type</code> is not a valid value.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">num_entries</code> is equal to zero and <code class="varname">device_type</code> is not NULL or if both <code class="varname">num_devices</code> and <code class="varname">device_type</code> are NULL.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_DEVICE_NOT_FOUND</span> if no OpenCL devices that matched <code class="varname">device_type</code> were found.
</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=31" 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>, <a class="citerefentry" href="clGetPlatformIDs.html"><span class="citerefentry"><span class="refentrytitle">clGetPlatformIDs</span></span></a>,
<a class="citerefentry" href="clCreateContext.html"><span class="citerefentry"><span class="refentrytitle">clCreateContext</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>
Copyright ©
Copyright © 2007-2009 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
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