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<title>clGetDeviceAndHostTimer</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="clGetDeviceAndHostTimer"></a>
<h1>clGetDeviceAndHostTimer</h1>
<p>Returns a reasonably synchronized pair of timestamps from the device timer and the host timer as seen by 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="scalarDataTypes.html" target="pagedisplay">cl_int</a>
<strong class="fsfunc">clGetDeviceAndHostTimer</strong>
(</code>
<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>
</td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">cl_ulong *</a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">device_timestamp</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_ulong *</a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">host_timestamp</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">device</code>
</span>
</dt>
<dd>
<p>
A device returned by
<a class="citerefentry" href="clGetDeviceIDs.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceIDs</span></span></a>.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">device_timestamp</code>
</span>
</dt>
<dd>
<p>
Will be updated with the value of the current timer in nanoseconds. The
resolution of the timer is the same as the device profiling timer returned by
<a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a>
and the
<code class="constant">CL_DEVICE_PROFILING_TIMER_RESOLUTION</code> query.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">host_timestamp</code>
</span>
</dt>
<dd>
<p>
Will be updated with the value of the current timer in nanoseconds
at the closest possible point in time to that at which
<code class="varname">device_timer</code> was returned.
The resolution of the timer may be queried via
<a class="citerefentry" href="clGetPlatformInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetPlatformInfo</span></span></a>
and the flag
<code class="constant">CL_PLATFORM_HOST_TIMER_RESOLUTION</code>.
</p>
</dd>
</dl>
</div>
</div>
<div class="refsect1">
<a id="notes"></a>
<h2>Notes</h2>
<p>
Returns a reasonably synchronized pair of timestamps
from the device timer and the host timer
as seen by <code class="varname">device</code>. Implementations
may need to execute this query with a high latency in order
to provide reasonable synchronization of the
timestamps. The host timestamp and device
timestamp returned by this function and
<a class="citerefentry" href="clGetHostTimer.html"><span class="citerefentry"><span class="refentrytitle">clGetHostTimer</span></span></a>
each have an implementation defined
timebase. The timestamps will always be in
their respective timebases regardless of which query
function is used. The timestamp returned from
<a class="citerefentry" href="clGetEventProfilingInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetEventProfilingInfo</span></span></a>
for an event on a device
and a device timestamp queried from the same
device will always be in the same timebase.
</p>
</div>
<div class="refsect1">
<a id="errors"></a>
<h2>Errors</h2>
<p>
<code class="function">clGetDeviceAndHostTimer</code> will return <span class="errorname">CL_SUCCESS</span>
with a time value in <code class="varname">host_timestamp</code> if provided.
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_DEVICE</span> if <code class="varname">device</code> is not
a valid OpenCL device.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">host_timestamp</code>
or <code class="varname">device_timestamp</code> is NULL.
</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#page=82" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="clGetHostTimer.html"><span class="citerefentry"><span class="refentrytitle">clGetHostTimer</span></span></a>,
<a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a>,
<a class="citerefentry" href="clGetPlatformInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetPlatformInfo</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
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