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| <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN" |
| "http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd" [ |
| <!ENTITY cl_device_type_Inc SYSTEM "cl_device_type_Inc.xml"> |
| ]> |
| |
| <refentry> |
| <refentryinfo> |
| <keywordset><keyword>clGetHostTimer</keyword></keywordset> |
| </refentryinfo> |
| <refmeta> |
| <refentrytitle>clGetHostTimer</refentrytitle> |
| <refmiscinfo> |
| <copyright> |
| <year>2007-2013</year> |
| <holder>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.</holder> |
| </copyright> |
| </refmiscinfo> |
| <manvolnum>3</manvolnum> |
| </refmeta> |
| |
| <!-- ================================ SYNOPSIS --> |
| |
| <refnamediv id="clGetHostTimer"> |
| <refname>clGetHostTimer</refname> |
| <refpurpose>Return the current value of the host clock as seen by device.</refpurpose> |
| </refnamediv> |
| <refsynopsisdiv xmlns:xlink="http://www.w3.org/1999/xlink"><title></title> |
| <funcsynopsis> |
| <funcprototype> |
| <funcdef> |
| <link xlink:href="scalarDataTypes.html">cl_int</link> |
| <function>clGetHostTimer</function> |
| </funcdef> |
| |
| <paramdef> |
| <link xlink:href="abstractDataTypes.html">cl_device_id</link> |
| <parameter>device</parameter> |
| </paramdef> |
| |
| <paramdef> |
| <link xlink:href="scalarDataTypes.html">cl_ulong *</link> |
| <parameter>host_timestamp</parameter> |
| </paramdef> |
| </funcprototype> |
| </funcsynopsis> |
| </refsynopsisdiv> |
| |
| <!-- ================================ PARAMETERS --> |
| |
| <refsect1 id="parameters"><title>Parameters</title> |
| <variablelist> |
| <varlistentry> |
| <term><varname>device</varname></term> |
| <listitem> |
| <para> |
| A device returned by |
| <citerefentry><refentrytitle>clGetDeviceIDs</refentrytitle></citerefentry>. |
| </para> |
| </listitem> |
| </varlistentry> |
| |
| |
| <varlistentry> |
| <term><varname>host_timestamp</varname></term> |
| <listitem> |
| <para> |
| Will be updated with the value of the current timer in nanoseconds. The |
| resolution of the timer may be queried via |
| <citerefentry><refentrytitle>clGetPlatformInfo</refentrytitle></citerefentry> |
| and the flag |
| <constant>CL_PLATFORM_HOST_TIMER_RESOLUTION</constant>. |
| </para> |
| </listitem> |
| </varlistentry> |
| |
| </variablelist> |
| </refsect1> |
| |
| <!-- ================================ NOTES --> |
| <refsect1 id="notes"><title>Notes</title> |
| |
| <para> |
| Return the current value of the host clock as seen by |
| <varname>device</varname>. This value is in the same timebase |
| as the host_timestamp returned from |
| <citerefentry><refentrytitle>clGetDeviceAndHostTimer</refentrytitle></citerefentry>. |
| The implementation will |
| return with as low a latency as possible to |
| allow a correlation with a subsequent application |
| sampled time. The host timestamp and device |
| timestamp returned by this function and |
| <citerefentry><refentrytitle>clGetDeviceAndHostTimer</refentrytitle></citerefentry> |
| 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 |
| <citerefentry><refentrytitle>clGetEventProfilingInfo</refentrytitle></citerefentry> |
| for an event on a device and a device |
| timestamp queried from the same device will |
| always be in the same timebase. |
| </para> |
| |
| </refsect1> |
| |
| <!-- ================================ ERRORS --> |
| |
| <refsect1 id="errors"><title>Errors</title> |
| <para> |
| <function>clGetHostTimer</function> will return <errorname>CL_SUCCESS</errorname> |
| with a time value in <varname>host_timestamp</varname> if provided. |
| Otherwise, it returns one of the following errors: |
| </para> |
| |
| <itemizedlist mark="disc"> |
| <listitem> |
| <errorname>CL_INVALID_DEVICE</errorname> if <varname>device</varname> is not |
| a valid OpenCL device. |
| </listitem> |
| |
| <listitem> |
| <errorname>CL_INVALID_VALUE</errorname> if <varname>host_timestamp</varname> is NULL. |
| </listitem> |
| |
| <listitem> |
| <errorname>CL_OUT_OF_RESOURCES</errorname> if there is a failure to allocate resources |
| required by the OpenCL implementation on the device. |
| </listitem> |
| |
| <listitem> |
| <errorname>CL_OUT_OF_HOST_MEMORY</errorname> if there is a failure to allocate |
| resources required by the OpenCL implementation on the host. |
| </listitem> |
| |
| </itemizedlist> |
| </refsect1> |
| |
| <!-- ================================ EXAMPLE --> |
| <!-- DO NOT DELETE IN CASE AN EXAMPLE IS ADDED IN THE FUTURE --> |
| <!-- |
| <refsect2 id="example1"> |
| <title> |
| Example |
| </title> |
| |
| <informaltable frame="none"> |
| <tgroup cols="1" align="left" colsep="0" rowsep="0"> |
| <colspec colname="col1" colnum="1" /> |
| <tbody> |
| <row> |
| <entry> |
| Example goes here - it will be set in "code" type with white space preserved. |
| </entry> |
| </row> |
| </tbody> |
| </tgroup> |
| </informaltable> |
| </refsect2> |
| --> |
| |
| <!-- ================================ SPECIFICATION --> |
| <!-- Set the "uri" attribute in the <olink /> element to the "named destination" for the PDF page |
| --> |
| |
| <refsect1 id="specification"><title>Specification</title> |
| <para><imageobject><imagedata fileref="pdficon_small1.gif" format="gif" /></imageobject> |
| <olink uri="clGetHostTimer">OpenCL Specification</olink> |
| </para> |
| </refsect1> |
| |
| <!-- ================================ ALSO SEE --> |
| |
| <refsect1 id="seealso"><title>Also see</title> |
| <para> |
| <citerefentry><refentrytitle>clGetDeviceAndHostTimer</refentrytitle></citerefentry>, |
| <citerefentry><refentrytitle>clGetPlatformInfo</refentrytitle></citerefentry> |
| </para> |
| </refsect1> |
| |
| <!-- ============================== COPYRIGHT --> |
| <!-- Content included from copyright.inc.xsl --> |
| |
| <refsect3 id="Copyright"><title></title> |
| <imageobject> |
| <imagedata fileref="KhronosLogo.jpg" format="jpg" /> |
| </imageobject> |
| <para /> |
| </refsect3> |
| |
| <!-- 29-Oct-2015, API rev. 19 --> |
| </refentry> |
| |