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<!-- ================================ SYNOPSIS -->
<refnamediv id="clEnqueueSVMMap">
Enqueues a command that will allow the host to update a region of a SVM buffer
<refsynopsisdiv xmlns:xlink=""><title></title>
<link xlink:href="scalarDataTypes.html">cl_int</link> <function>clEnqueueSVMMap</function>
<paramdef><link xlink:href="abstractDataTypes.html">cl_command_queue</link><parameter>command_queue</parameter></paramdef>
<paramdef><link xlink:href="enums.html#cl_bool">cl_bool</link><parameter>blocking_map</parameter></paramdef>
<paramdef><link xlink:href="enums.html#cl_map_flags">cl_map_flags</link><parameter>map_flags</parameter></paramdef>
<paramdef><link xlink:href="scalarDataTypes.html">void</link><parameter>*svm_ptr</parameter></paramdef>
<paramdef><link xlink:href="scalarDataTypes.html">size_t</link><parameter>size</parameter></paramdef>
<paramdef><link xlink:href="scalarDataTypes.html">cl_uint</link><parameter>num_events_in_wait_list</parameter></paramdef>
<paramdef>const <link xlink:href="abstractDataTypes.html">cl_event</link><parameter>*event_wait_list</parameter></paramdef>
<paramdef><link xlink:href="abstractDataTypes.html">cl_event</link><parameter>*event</parameter></paramdef>
<!-- ================================ PARAMETERS -->
<refsect1 id="parameters">
<term> <varname> command_queue </varname> </term>
Must be a valid host command-queue.
<term> <varname> blocking_map </varname> </term>
Indicates if the map operation is <varname>blocking</varname> or
If <varname>blocking_map</varname> is <constant>CL_TRUE</constant>,
<function>clEnqueueSVMMap</function> does not return until the application can
access the contents of the SVM region specified by
<varname>svm_ptr</varname> and <varname>size</varname> on the host.
If <varname>blocking_map</varname> is <constant>CL_FALSE</constant>
i.e. map operation is non-blocking, the region specified by
<varname>svm_ptr</varname> and <varname>size</varname>
cannot be used until the map command has completed.
The <varname>event</varname> argument
returns an event object which can be used to query
the execution status of the map command.
When the map command is completed, the application
can access the contents of the region
specified by <varname>svm_ptr</varname> and
<!-- ================================ PARAMETER TABLE (OPTIONAL) -->
<!-- Use this if parameter information requires a table. Adjust the number of columns by adjusting
<colspec /> tags. Column header goes in the <thead /> section. Delte the section if no column head needed.
A bit-bield with the following supported values.
<term><varname>svm_ptr</varname> and <varname>size</varname></term>
A pointer to a memory region and size in bytes
that will be updated by the
host. If <varname>svm_ptr</varname> is allocated using
then it must be allocated from the same context
from which <varname>command_queue</varname> was created.
Otherwise the behavior is undefined.
Specify events that need to complete before this particular
command can be executed. If <varname>event_wait_list</varname>
is NULL, then this particular command does not wait on any
event to complete. If <varname>event_wait_list</varname> is
NULL, <varname>num_events_in_wait_list</varname> must be 0. If
<varname>event_wait_list</varname> is not NULL, the list of events
pointed to by <varname>event_wait_list</varname> must be valid
and <varname>num_events_in_wait_list</varname> must be greater
than 0. The events specified in <varname>event_wait_list</varname>
act as synchronization points. The context associated with events in
<varname>event_wait_list</varname> and <varname>command_queue</varname> must
be the same. The memory associated with <varname>event_wait_list</varname>
can be reused or freed after the function returns.
<term> <varname> event </varname> </term>
Returns an event object that identifies this particular command
and can be used to query or queue a wait for this particular command
to complete. <varname>event</varname> can be NULL in which case
it will not be possible for the application to query the status of
this command or queue a wait for this command to complete.
can be used instead. If the
<varname>event_wait_list</varname> and the <varname>event</varname>
arguments are not NULL, the <varname>event</varname> argument should not
refer to an element of the <varname>event_wait_list</varname> array.
<!-- ================================ NOTES -->
<refsect1 id="notes"><title>Notes</title>
Note that
since we are enqueuing a command with a SVM buffer, the region is already mapped in the host
address space.
<citerefentry><refentrytitle>clEnqueueSVMMap</refentrytitle></citerefentry>, and
act as synchronization points for the region
of the SVM buffer specified in these calls.
<!-- ================================ ERRORS -->
<refsect1 id="errors"><title>Errors</title>
<function>clEnqueueSVMMap</function> returns <constant>CL_SUCCESS</constant>
if the function is executed successfully. Otherwise,
it returns one of the following errors:
<itemizedlist mark="disc">
<errorname>CL_INVALID_COMMAND_QUEUE</errorname> if <varname>command_queue</varname>
is not a valid host command-queue.
<errorname>CL_INVALID_CONTEXT</errorname> if the context associated with
and events in <varname>event_wait_list</varname> are not the same.
<errorname>CL_INVALID_VALUE</errorname> if <varname>svm_ptr</varname> is NULL.
<errorname>CL_INVALID_VALUE</errorname> if <varname>size</varname>
is 0 or if values specified in <varname>map_flags</varname> are not valid.
if <varname>event_wait_list</varname> is NULL and
<varname>num_events_in_wait_list</varname> &gt; 0,
or <varname>event_wait_list</varname> is not NULL and
<varname>num_events_in_wait_list</varname> is 0, or if event objects in
<varname>event_wait_list</varname> are not valid events.
if the map operation is
blocking and the execution status of any of the
events in <varname>event_wait_list</varname> is a negative
integer value.
<errorname>CL_OUT_OF_RESOURCES</errorname> if there is a failure to allocate
resources required by the OpenCL implementation on the device.
<errorname>CL_OUT_OF_HOST_MEMORY</errorname> if there is a failure to allocate
resources required by the OpenCL implementation on the host.
<!-- ================================ EXAMPLE -->
<refsect2 id="example1">
<informaltable frame="none">
<tgroup cols="1" align="left" colsep="0" rowsep="0">
<colspec colname="col1" colnum="1" />
Example goes here - it will be set in "code" type with white space preserved.
<!-- ================================ SPECIFICATION -->
<!-- Set the "uri" attribute in the <olink /> element to the "named destination" for the PDF page
<refsect1 id="specification"><title>Specification</title>
<imagedata fileref="pdficon_small1.gif" format="gif" />
<olink uri="clEnqueueSVMMap">OpenCL Specification</olink>
<!-- ================================ ALSO SEE -->
<refsect1 id="seealso"><title>Also see</title>
<citerefentry href="sharedVirtualMemory"><refentrytitle>Shared Virtual Memory Functions</refentrytitle></citerefentry>
<!-- ================================ COPYRIGHT -->
<!-- Content included from -->
<refsect3 id="Copyright"><title></title>
<imagedata fileref="KhronosLogo.jpg" format="jpg" />
<para />
<!-- 9-Dec-2013, rev. 19 -->