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</style>
<title>clGetDeviceIDs</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.79.1" />
<meta name="keywords" content="clGetDeviceIDs" />
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<body>
<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="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="pagedisplay">cl_int</a>
<strong class="fsfunc">clGetDeviceIDs</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">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#cl_device_type" target="pagedisplay">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="pagedisplay">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="pagedisplay">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="pagedisplay">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_CUSTOM</code>
</td>
<td align="left">
Dedicated accelerators that do not support programs written in
OpenCL C.
</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. The default device cannot
be a <code class="constant">CL_DEVICE_TYPE_CUSTOM</code> device.
</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 except
<code class="constant">CL_DEVICE_TYPE_CUSTOM</code> devices.
</td>
</tr>
</tbody>
</table>
</div>
</dd>
<dt>
<span class="term">
<code class="varname">num_entries</code>
</span>
</dt>
<dd>
<p>
The number of <span class="type">cl_device_id</span> 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 <span class="type">cl_device_id</span> 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>
</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 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_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">devices</code> is not NULL or if both <code class="varname">num_devices</code>
and <code class="varname">devices</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>
<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="https://www.khronos.org/registry/cl/specs/opencl-2.1.pdf#namedest=clGetDeviceIDs" 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>,
<a class="citerefentry" href="classDiagram.html"><span class="citerefentry"><span class="refentrytitle">Cardinality Diagram</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
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"Materials"), to deal in the Materials without restriction, including
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distribute, sublicense, and/or sell copies of the Materials, and to
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