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| <title>clGetCommandQueueInfo</title> |
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| <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="clGetCommandQueueInfo"></a> |
| <h1>clGetCommandQueueInfo</h1> |
| <p>Query information about a command-queue.</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">clGetCommandQueueInfo</strong> |
| (</code> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_command_queue</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">command_queue</var> |
| , </td> |
| </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_command_queue_info" target="pagedisplay">cl_command_queue_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">command_queue</code> |
| </span> |
| </dt> |
| <dd> |
| <p>Specifies the command-queue being queried.</p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname">param_name</code> |
| </span> |
| </dt> |
| <dd> |
| <p>Specifies the information to query.</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 ≥ size |
| of return type as described in the table below. |
| If <code class="varname">param_value</code> is NULL, it is ignored.</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_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> |
| <dt> |
| <span class="term"></span> |
| </dt> |
| <dd> |
| <p> |
| The list of supported <code class="varname">param_name</code> values and |
| the information returned in <code class="varname">param_value</code> by |
| <code class="function">clGetCommandQueueInfo</code> is described in the table below. |
| </p> |
| <div class="informaltable"> |
| <table border="1"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| <col align="left" class="col2" /> |
| </colgroup> |
| <thead> |
| <tr> |
| <th align="left">cl_command_queue_info</th> |
| <th align="left">Return Type and Information returned in param_value</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_QUEUE_CONTEXT</code> |
| </td> |
| <td align="left"> |
| Return type: <span class="type">cl_context</span> |
| |
| <p>Return the context specified when the command-queue is created.</p></td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_QUEUE_DEVICE</code> |
| </td> |
| <td align="left"> |
| Return type: <span class="type">cl_device_id</span> |
| |
| <p>Return the device specified when the command-queue is created.</p></td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_QUEUE_REFERENCE_COUNT</code> |
| </td> |
| <td align="left"> |
| Return type: <span class="type">cl_uint</span> |
| |
| <p>Return the command-queue reference count.</p> |
| <p> |
| The reference count returned with |
| <code class="constant">CL_QUEUE_REFERENCE_COUNT</code> should be considered |
| immediately stale. It is unsuitable for general use in applications. This |
| feature is provided for identifying memory leaks. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_QUEUE_PROPERTIES</code> |
| </td> |
| <td align="left"> |
| Return type: <span class="type">cl_command_queue_properties</span> |
| |
| <p> |
| Return the currently specified properties for the command-queue. These |
| properties are specified by the <code class="varname">properties</code> argument in |
| <a class="citerefentry" href="clCreateCommandQueue.html"><span class="citerefentry"><span class="refentrytitle">clCreateCommandQueue</span></span></a>. |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </dd> |
| </dl> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="notes"></a> |
| <h2>Notes</h2> |
| <p> |
| It is possible that a device(s) becomes unavailable after a context and command-queues |
| that use this device(s) have been created and commands have been queued to |
| command-queues. In this case the behavior of OpenCL API calls that use this context |
| (and command-queues) are considered to be implementation-defined. The user callback |
| function, if specified, when the context is created can be used to record appropriate |
| information in the <code class="varname">errinfo</code>, <code class="varname">private_info</code> |
| arguments passed to the callback function when the device becomes unavailable. |
| </p> |
| </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 the following: |
| </p> |
| <div class="itemizedlist"> |
| <ul class="itemizedlist" style="list-style-type: disc; "> |
| <li class="listitem" style="list-style-type: disc"> |
| Returns <span class="errorname">CL_INVALID_COMMAND_QUEUE</span> if |
| <code class="varname">command_queue</code> is not a valid command-queue. |
| </li> |
| <li class="listitem" style="list-style-type: disc"> |
| Returns <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 less than size of return type and |
| <code class="varname">param_value</code> is not a NULL 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=63" target="OpenCL Spec">OpenCL Specification</a> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="seealso"></a> |
| <h2>Also see</h2> |
| <p> |
| <a class="citerefentry" href="clCreateCommandQueue.html"><span class="citerefentry"><span class="refentrytitle">clCreateCommandQueue</span></span></a>, |
| <a class="citerefentry" href="clReleaseCommandQueue.html"><span class="citerefentry"><span class="refentrytitle">clReleaseCommandQueue</span></span></a>, |
| <a class="citerefentry" href="clRetainCommandQueue.html"><span class="citerefentry"><span class="refentrytitle">clRetainCommandQueue</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. |
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