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| <title>clGetDeviceIDs</title> |
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| <meta name="keywords" content="clGetDeviceIDs" /> |
| </head> |
| <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. |
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| permit persons to whom the Materials are furnished to do so, subject to |
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