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| <title>clCreateCommandQueueWithProperties</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="clCreateCommandQueueWithProperties"></a> | |
| <h1>clCreateCommandQueueWithProperties</h1> | |
| <p>Create a host or device command-queue on a specific device.</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="abstractDataTypes.html" target="pagedisplay">cl_command_queue</a> <strong class="fsfunc">clCreateCommandQueueWithProperties</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="abstractDataTypes.html" target="pagedisplay">cl_device_id</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">device</var>, </td> | |
| </tr> | |
| <tr valign="top"> | |
| <td> </td> | |
| <td>const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_queue_properties" target="pagedisplay">cl_queue_properties</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*properties</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_int</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*errcode_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> | |
| Must be a valid OpenCL context. | |
| </p> | |
| </dd> | |
| <dt> | |
| <span class="term"> | |
| <code class="varname">device</code> | |
| </span> | |
| </dt> | |
| <dd> | |
| <p> | |
| Must be a device or sub-device associated with <code class="varname">context</code>. | |
| It can either be in the list of devices and sub-devices specified when | |
| <code class="varname">context</code> is created using | |
| <a class="citerefentry" href="clCreateContext.html"><span class="citerefentry"><span class="refentrytitle">clCreateContext</span></span></a> | |
| or be a root device with the same device type as specified | |
| when the <code class="varname">context</code> is created using | |
| <a class="citerefentry" href="clCreateContextFromType.html"><span class="citerefentry"><span class="refentrytitle">clCreateContextFromType</span></span></a>. | |
| </p> | |
| </dd> | |
| <dt> | |
| <span class="term"> | |
| <code class="varname">properties</code> | |
| </span> | |
| </dt> | |
| <dd> | |
| <p> | |
| Specifies a list of properties for the | |
| command-queue and their corresponding values. | |
| Each property name is immediately followed | |
| by the corresponding desired value. The list is | |
| terminated with 0. The list of supported properties | |
| is described in the table below. If a | |
| supported property and its value is not specified in | |
| <code class="varname">properties</code>, its default value will be used. | |
| <code class="varname">properties</code> can be NULL in which case | |
| the default values for supported command-queue properties | |
| will be used. | |
| </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">Queue Properties</th> | |
| <th align="left">Property Value</th> | |
| <th align="left">Description</th> | |
| </tr> | |
| </thead> | |
| <tbody> | |
| <tr> | |
| <td align="left"> | |
| <code class="constant">CL_QUEUE_PROPERTIES</code> | |
| </td> | |
| <td align="left"> | |
| <span class="type">cl_command_queue_- | |
| properties</span> | |
| </td> | |
| <td align="left"><p>This is a bitfield and can be set to a | |
| combination of the following values:</p> | |
| <p><code class="constant">CL_QUEUE_OUT_OF_ORDER_EXEC_MODE_ENABLE</code> - | |
| Determines whether the | |
| commands queued in the command-queue | |
| are executed in-order or out-of-order. If | |
| set, the commands in the command-queue | |
| are executed out-of-order. Otherwise, | |
| commands are executed in-order.</p> | |
| <p><code class="constant">CL_QUEUE_PROFILING_ENABLE</code> - | |
| Enable or disable profiling of commands in | |
| the command-queue. If set, the profiling of | |
| commands is enabled. Otherwise profiling | |
| of commands is disabled.</p> | |
| <p><code class="constant">CL_QUEUE_ON_DEVICE</code> - Indicates that this | |
| is a device queue. If <code class="constant">CL_QUEUE_ON_DEVICE</code> | |
| is set, <code class="constant">CL_QUEUE_OUT_OF_ORDER_EXEC_MODE_ENABLE</code> | |
| must also be set. Only out-of-order device queues are supported.</p> | |
| <p><code class="constant">CL_QUEUE_ON_DEVICE_DEFAULT</code> - | |
| indicates that this is the default device | |
| queue. This can only be used with | |
| <code class="constant">CL_QUEUE_ON_DEVICE</code>. | |
| The application must create the default device queue | |
| if any kernels containing calls to get_default_queue are | |
| enqueued. There can only be one default device | |
| queue for each device within a context. | |
| clCreateCommandQueueWithProperties with | |
| <code class="constant">CL_QUEUE_PROPERTIES</code> set to | |
| <code class="constant">CL_QUEUE_ON_DEVICE</code> | | |
| <code class="constant">CL_QUEUE_ON_DEVICE_DEFAULT</code> | |
| will return the default device queue that has | |
| already been created and | |
| increment its retain count by 1. | |
| </p> | |
| <p>If <code class="constant">CL_QUEUE_PROPERTIES</code> is not | |
| specified an in-order host command queue | |
| is created for the specified device.</p> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="left"> | |
| <code class="constant">CL_QUEUE_SIZE</code> | |
| </td> | |
| <td align="left"> | |
| <span class="type">cl_uint</span> | |
| </td> | |
| <td align="left"><p>Specifies the size of the device queue in | |
| bytes.</p> | |
| <p>This can only be specified if | |
| <code class="constant">CL_QUEUE_ON_DEVICE</code> is set in | |
| <code class="constant">CL_QUEUE_PROPERTIES</code>. This must be a | |
| value ≤ <code class="constant">CL_DEVICE_QUEUE_ON_DEVICE_MAX_SIZE</code>.</p> | |
| <p>For best performance, this should be ≤ | |
| <code class="constant">CL_DEVICE_QUEUE_ON_DEVICE_PREFERRED_SIZE</code>.</p> | |
| <p>If <code class="constant">CL_QUEUE_SIZE</code> is not specified, the | |
| device queue is created with | |
| <code class="constant">CL_DEVICE_QUEUE_ON_DEVICE_PREFERRED_SIZE</code> | |
| as the size of the queue.</p></td> | |
| </tr> | |
| <tr> | |
| <td align="left"> | |
| <code class="constant">CL_QUEUE_PRIORITY_KHR</code> | |
| </td> | |
| <td align="left"> | |
| <span class="type">cl_queue_priority_khr</span> | |
| </td> | |
| <td align="left"> | |
| <p> | |
| Applies only if the | |
| <a class="citerefentry" href="cl_khr_priority_hints.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_priority_hints</span></span></a> | |
| extension is enabled. | |
| </p> | |
| <p> | |
| Can be one of | |
| <code class="constant">CL_QUEUE_PRIORITY_HIGH_KHR</code>, | |
| <code class="constant">CL_QUEUE_PRIORITY_MED_KHR</code>, or | |
| <code class="constant">CL_QUEUE_PRIORITY_LOW_KHR</code>. | |
| </p> | |
| <p> | |
| If <code class="constant">CL_QUEUE_PRIORITY_KHR</code> | |
| is not specified then the default priority is | |
| <code class="constant">CL_QUEUE_PRIORITY_MED_KHR</code>. | |
| </p> | |
| </td> | |
| </tr> | |
| <tr> | |
| <td align="left"> | |
| <code class="constant">CL_QUEUE_THROTTLE_KHR</code> | |
| </td> | |
| <td align="left"> | |
| <span class="type"></span> | |
| </td> | |
| <td align="left"> | |
| <p> | |
| Applies only if the | |
| <a class="citerefentry" href="cl_khr_throttle_hints.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_throttle_hints</span></span></a> | |
| extension is enabled. | |
| </p> | |
| <p> | |
| Can be one of | |
| <code class="constant">CL_QUEUE_THROTTLE_HIGH_KHR</code>, | |
| <code class="constant">CL_QUEUE_THROTTLE_MED_KHR</code>, | |
| <code class="constant">CL_QUEUE_THROTTLE_LOW_KHR</code> | |
| </p> | |
| <p> | |
| If <code class="constant">CL_QUEUE_THROTTLE_KHR</code> | |
| is not specified then the default priority is | |
| <code class="constant">CL_QUEUE_THROTTLE_MED_KHR</code>. | |
| </p> | |
| </td> | |
| </tr> | |
| </tbody> | |
| </table> | |
| </div> | |
| </dd> | |
| <dt> | |
| <span class="term"> | |
| <code class="varname">errcode_ret</code> | |
| </span> | |
| </dt> | |
| <dd> | |
| <p> | |
| Returns an appropriate error code. If <code class="varname">errcode_ret</code> | |
| is <code class="constant">NULL</code>, no error code is returned. | |
| </p> | |
| </dd> | |
| </dl> | |
| </div> | |
| </div> | |
| <div class="refsect1"> | |
| <a id="notes"></a> | |
| <h2>Notes</h2> | |
| <p> | |
| OpenCL objects such as memory, program and kernel objects are created using a | |
| context. Operations on these objects are performed using a command-queue. The | |
| command-queue can be used to queue a set of operations (referred to as commands) | |
| in order. Having multiple command-queues allows applications to queue multiple | |
| independent commands without requiring synchronization. Note that this should work | |
| as long as these objects are not being shared. Sharing of objects across multiple | |
| command-queues will require the application to perform appropriate synchronization. | |
| This is described in Appendix A of the specification. | |
| </p> | |
| <h4><a id="id-1.6.3"></a>Out-of-order Execution of Kernels and Memory Object Commands</h4> | |
| <p> | |
| The OpenCL functions that are submitted to a command-queue are enqueued in the order | |
| the calls are made but can be configured to execute in-order or out-of-order. The | |
| <code class="varname">properties</code> argument in <code class="function">clCreateCommandQueueWithProperties</code> | |
| can be used to specify the execution order. | |
| </p> | |
| <p> | |
| If the <code class="constant">CL_QUEUE_OUT_OF_ORDER_EXEC_MODE_ENABLE</code> | |
| property of a command-queue is not set, the commands enqueued to a | |
| command-queue execute in order. For example, if an application calls | |
| <a class="citerefentry" href="clEnqueueNDRangeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNDRangeKernel</span></span></a> | |
| to execute kernel A followed by a | |
| <a class="citerefentry" href="clEnqueueNDRangeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNDRangeKernel</span></span></a> | |
| to execute kernel B, the application can assume that kernel A finishes first and then | |
| kernel B is executed. If the memory objects output by kernel A are inputs to kernel | |
| B then kernel B will see the correct data in memory objects produced by execution of | |
| kernel A. If the <code class="constant">CL_QUEUE_OUT_OF_ORDER_EXEC_MODE_ENABLE</code> property | |
| of a command-queue is set, then there is no guarantee that kernel A will finish before | |
| kernel B starts execution. | |
| </p> | |
| <p> | |
| Applications can configure the commands enqueued to a command-queue to execute | |
| out-of-order by setting the <code class="constant">CL_QUEUE_OUT_OF_ORDER_EXEC_MODE_ENABLE</code> | |
| property of the command-queue. This can be specified when the command-queue is | |
| created. In out-of-order execution mode there is no guarantee that the enqueued | |
| commands will finish execution in the order they were queued. As there is no | |
| guarantee that kernels will be executed in order, i.e. based on when the | |
| <a class="citerefentry" href="clEnqueueNDRangeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNDRangeKernel</span></span></a> | |
| calls are made within a command-queue, it is therefore possible that an earlier | |
| <a class="citerefentry" href="clEnqueueNDRangeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNDRangeKernel</span></span></a> | |
| call to execute kernel A identified by event A may execute and/or finish later than a | |
| <a class="citerefentry" href="clEnqueueNDRangeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNDRangeKernel</span></span></a> | |
| call to execute kernel B which was called by the application at a later | |
| point in time. To guarantee a specific order of execution of kernels, a | |
| wait on a particular event (in this case event A) can be used. The wait for | |
| event A can be specified in the <code class="varname">event_wait_list</code> argument to | |
| <a class="citerefentry" href="clEnqueueNDRangeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNDRangeKernel</span></span></a> | |
| for kernel B. | |
| </p> | |
| <p> | |
| In addition, a wait for events | |
| (<a class="citerefentry" href="clEnqueueMarkerWithWaitList.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMarkerWithWaitList</span></span></a>) | |
| or a barrier | |
| (<a class="citerefentry" href="clEnqueueBarrierWithWaitList.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueBarrierWithWaitList</span></span></a>) | |
| command can be enqueued to the command-queue. The wait for events command ensures | |
| that previously enqueued commands identified by the list of events to wait for have | |
| finished before the next batch of commands is executed. The barrier command ensures | |
| that all previously enqueued commands in a command-queue have finished execution | |
| before the next batch of commands is executed. | |
| </p> | |
| <p> | |
| Similarly, commands to read, write, copy or map memory objects that are enqueued after | |
| <a class="citerefentry" href="clEnqueueNDRangeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNDRangeKernel</span></span></a> or | |
| <a class="citerefentry" href="clEnqueueNativeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNativeKernel</span></span></a> | |
| commands are not guaranteed to wait for kernels scheduled for execution to have | |
| completed (if the <code class="constant">CL_QUEUE_OUT_OF_ORDER_EXEC_MODE_ENABLE</code> | |
| property is set). To ensure correct ordering of commands, the event object returned by | |
| <a class="citerefentry" href="clEnqueueNDRangeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNDRangeKernel</span></span></a> or | |
| <a class="citerefentry" href="clEnqueueNativeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNativeKernel</span></span></a> | |
| can be used to enqueue a wait for event or a barrier command can be enqueued that | |
| must complete before reads or writes to the memory object(s) occur. | |
| </p> | |
| </div> | |
| <div class="refsect1"> | |
| <a id="errors"></a> | |
| <h2>Errors</h2> | |
| <p> | |
| <code class="function">clCreateCommandQueueWithProperties</code> | |
| returns a valid non-zero command-queue and | |
| <code class="varname">errcode_ret</code> is set to <span class="errorname">CL_SUCCESS</span> if the | |
| command-queue is created successfully. Otherwise, it returns a NULL value with one | |
| of the following error values returned in <code class="varname">errcode_ret</code>: | |
| </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_DEVICE</span> if <code class="varname">device</code> is not a valid | |
| device or is not associated with <code class="varname">context</code>. | |
| </li> | |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if values specified in | |
| <code class="varname">properties</code> are not valid. | |
| </li> | |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_QUEUE_PROPERTIES</span> if values specified in | |
| <code class="varname">properties</code> are valid but are not supported by the device. | |
| </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> | |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_QUEUE_PROPERTIES</span> if | |
| extension | |
| <a class="citerefentry" href="cl_khr_priority_hints.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_priority_hints</span></span></a> | |
| is enabled and | |
| the <code class="constant">CL_QUEUE_PRIORITY_KHR</code> property is | |
| specified and the queue is a <code class="constant">CL_QUEUE_ON_DEVICE</code>. | |
| </li> | |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_QUEUE_PROPERTIES</span> if | |
| extension | |
| <a class="citerefentry" href="cl_khr_throttle_hints.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_throttle_hints</span></span></a> | |
| is enabled and | |
| the <code class="constant">CL_QUEUE_PRIORITY_KHR</code> property is | |
| specified and the queue is a <code class="constant">CL_QUEUE_ON_DEVICE</code>. | |
| </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#page=97" target="OpenCL Spec">OpenCL Specification</a> | |
| </p> | |
| </div> | |
| <div class="refsect1"> | |
| <a id="seealso"></a> | |
| <h2>Also see</h2> | |
| <p> | |
| <a class="citerefentry" href="clGetCommandQueueInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetCommandQueueInfo</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>, | |
| <a class="citerefentry" href="clCreateContext.html"><span class="citerefentry"><span class="refentrytitle">clCreateContext</span></span></a>, | |
| <a class="citerefentry" href="clCreateContextFromType.html"><span class="citerefentry"><span class="refentrytitle">clCreateContextFromType</span></span></a>, | |
| <a class="citerefentry" href="clEnqueueNDRangeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNDRangeKernel</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 | |
| 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 | |
| permit persons to whom the Materials are furnished to do so, subject to | |
| the condition that this copyright notice and permission notice shall be included | |
| in all copies or substantial portions of the Materials. | |
| </div> | |
| </div> | |
| </body> | |
| </html> |