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skia / external / github.com / KhronosGroup / OpenCL-Registry / refs/heads/master / . / sdk / 2.2 / docs / man / html / clCreateCommandQueueWithProperties.html
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<body class="manpage">
<div id="header">
<h1>clCreateCommandQueueWithProperties(3) Manual Page</h1>
<h2 id="_name">Name</h2>
<div class="sectionbody">
<p>clCreateCommandQueueWithProperties - Create a host or device command-queue on a specific device.</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_c_specification">C Specification</h2>
<div class="sectionbody">
<div class="paragraph">
<p>To create a host or device command-queue on a specific device, call the
function</p>
</div>
<div id="clCreateCommandQueueWithProperties" class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c++" data-lang="c++">cl_command_queue clCreateCommandQueueWithProperties(
cl_context context,
cl_device_id device,
const cl_queue_properties* properties,
cl_int* errcode_ret);</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_parameters">Parameters</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p><em>context</em> must be a valid OpenCL context.</p>
</li>
<li>
<p><em>device</em> must be a device or sub-device associated with <em>context</em>.
It can either be in the list of devices and sub-devices specified when
<em>context</em> is created using <strong>clCreateContext</strong> or be a root device with the
same device type as specified when <em>context</em> is created using
<strong>clCreateContextFromType</strong>.</p>
</li>
<li>
<p><em>properties</em> 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
<a href="https://www.khronos.org/registry/OpenCL/specs/2.2/html/OpenCL_API.html#queue-properties-table" target="_blank" rel="noopener">table below</a>.
If a supported property and its value is not specified in <em>properties</em>, its
default value will be used.
<em>properties</em> can be <code>NULL</code> in which case the default values for supported
command-queue properties will be used.</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_description">Description</h2>
<div class="sectionbody">
<table id="queue-properties-table" class="tableblock frame-all grid-all stretch">
<caption class="title">Table 1. List of supported queue creation properties by <a href="https://www.khronos.org/registry/OpenCL/specs/2.2/html/OpenCL_API.html#clCreateCommandQueueWithProperties" class="bare" target="_blank" rel="noopener">https://www.khronos.org/registry/OpenCL/specs/2.2/html/OpenCL_API.html#clCreateCommandQueueWithProperties</a></caption>
<colgroup>
<col style="width: 34%;">
<col style="width: 33%;">
<col style="width: 33%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top"><strong>Queue Properties</strong></th>
<th class="tableblock halign-left valign-top">Property Value</th>
<th class="tableblock halign-left valign-top">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>CL_&#8203;QUEUE_&#8203;PROPERTIES</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">cl_bitfield</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">This is a bitfield and can be set to a combination of the following
values:</p>
<p class="tableblock"> <code>CL_&#8203;QUEUE_&#8203;OUT_&#8203;OF_&#8203;ORDER_&#8203;EXEC_&#8203;MODE_&#8203;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 class="tableblock"> <code>CL_&#8203;QUEUE_&#8203;PROFILING_&#8203;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 class="tableblock"> <code>CL_&#8203;QUEUE_&#8203;ON_&#8203;DEVICE</code> - Indicates that this is a device queue.
If <code>CL_&#8203;QUEUE_&#8203;ON_&#8203;DEVICE</code> is set,
<code>CL_&#8203;QUEUE_&#8203;OUT_&#8203;OF_&#8203;ORDER_&#8203;EXEC_&#8203;MODE_&#8203;ENABLE</code><sup>1</sup> must also be set.
<a href="#unified-spec">Missing before</a> version 2.0.</p>
<p class="tableblock"> <code>CL_&#8203;QUEUE_&#8203;ON_&#8203;DEVICE_&#8203;DEFAULT</code><sup>2</sup> - indicates that this is the default
device queue.
This can only be used with <code>CL_&#8203;QUEUE_&#8203;ON_&#8203;DEVICE</code>.
<a href="#unified-spec">Missing before</a> version 2.0.</p>
<p class="tableblock"> If <code>CL_&#8203;QUEUE_&#8203;PROPERTIES</code> is not specified an in-order host command
queue is created for the specified device</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>CL_&#8203;QUEUE_&#8203;SIZE</code></p>
<p class="tableblock"><a href="#unified-spec">Missing before</a> version 2.0.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">cl_uint</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Specifies the size of the device queue in bytes.</p>
<p class="tableblock"> This can only be specified if <code>CL_&#8203;QUEUE_&#8203;ON_&#8203;DEVICE</code> is set in
<code>CL_&#8203;QUEUE_&#8203;PROPERTIES</code>.
This must be a value ≤ <code>CL_&#8203;DEVICE_&#8203;QUEUE_&#8203;ON_&#8203;DEVICE_&#8203;MAX_&#8203;SIZE</code>.</p>
<p class="tableblock"> For best performance, this should be ≤
<code>CL_&#8203;DEVICE_&#8203;QUEUE_&#8203;ON_&#8203;DEVICE_&#8203;PREFERRED_&#8203;SIZE</code>.</p>
<p class="tableblock"> If <code>CL_&#8203;QUEUE_&#8203;SIZE</code> is not specified, the device queue is created with
<code>CL_&#8203;DEVICE_&#8203;QUEUE_&#8203;ON_&#8203;DEVICE_&#8203;PREFERRED_&#8203;SIZE</code> as the size of the queue.</p></td>
</tr>
</tbody>
</table>
<div class="dlist">
<dl>
<dt class="hdlist1">1</dt>
<dd>
<p>Only out-of-order device queues are supported.</p>
</dd>
<dt class="hdlist1">2</dt>
<dd>
<p>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.
<strong>clCreateCommandQueueWithProperties</strong> with <code>CL_&#8203;QUEUE_&#8203;PROPERTIES</code> set to
<code>CL_&#8203;QUEUE_&#8203;ON_&#8203;DEVICE</code> or <code>CL_&#8203;QUEUE_&#8203;ON_&#8203;DEVICE_&#8203;DEFAULT</code> will return the default
device queue that has already been created and increment its retain
count by 1.</p>
<div class="ulist">
<ul>
<li>
<p><em>errcode_ret</em> will return an appropriate error code.
If <em>errcode_ret</em> is <code>NULL</code>, no error code is returned.</p>
</li>
</ul>
</div>
</dd>
</dl>
</div>
<div class="paragraph">
<p><strong>clCreateCommandQueueWithProperties</strong> returns a valid non-zero command-queue
and <em>errcode_ret</em> is set to <code>CL_&#8203;SUCCESS</code> if the command-queue is created
successfully.
Otherwise, it returns a <code>NULL</code> value with one of the following error values
returned in <em>errcode_ret</em>:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>CL_&#8203;INVALID_&#8203;CONTEXT</code> if <em>context</em> is not a valid context.</p>
</li>
<li>
<p><code>CL_&#8203;INVALID_&#8203;DEVICE</code> if <em>device</em> is not a valid device or is not associated
with <em>context</em>.</p>
</li>
<li>
<p><code>CL_&#8203;INVALID_&#8203;VALUE</code> if values specified in <em>properties</em> are not valid.</p>
</li>
<li>
<p><code>CL_&#8203;INVALID_&#8203;QUEUE_&#8203;PROPERTIES</code> if values specified in <em>properties</em> are
valid but are not supported by the device.</p>
</li>
<li>
<p><code>CL_&#8203;OUT_&#8203;OF_&#8203;RESOURCES</code> if there is a failure to allocate resources required
by the OpenCL implementation on the device.</p>
</li>
<li>
<p><code>CL_&#8203;OUT_&#8203;OF_&#8203;HOST_&#8203;MEMORY</code> if there is a failure to allocate resources
required by the OpenCL implementation on the host.</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">See Also</h2>
<div class="sectionbody">
<div class="paragraph">
<p><a href="cl_context.html">cl_context</a>, <a href="cl_device_id.html">cl_device_id</a>, <a href="cl_int.html">cl_int</a>, <a href="cl_queue_properties.html">cl_queue_properties</a></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_document_notes">Document Notes</h2>
<div class="sectionbody">
<div class="paragraph">
<p>For more information, see the <a href="https://www.khronos.org/registry/OpenCL/specs/2.2/html/OpenCL_API.html#clCreateCommandQueueWithProperties" target="_blank" rel="noopener">OpenCL Specification</a></p>
</div>
<div class="paragraph">
<p>This page is extracted from the OpenCL Specification.
Fixes and changes should be made to the Specification, not directly.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_copyright">Copyright</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Copyright (c) 2014-2020 Khronos Group. This work is licensed under a
<a href="http://creativecommons.org/licenses/by/4.0/" target="_blank" rel="noopener">Creative Commons
Attribution 4.0 International License</a>.</p>
</div>
</div>
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