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<title>clEnqueueMigrateMemObjects</title>
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<meta name="keywords" content="clEnqueueMigrateMemObjects" />
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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="clEnqueueMigrateMemObjects"></a>
<h1>
clEnqueueMigrateMemObjects
</h1>
<p>
Enqueues a command to indicate which device a set of memory objects should be associated with.
</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">clEnqueueMigrateMemObjects </strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_command_queue</a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">command_queue</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_uint</a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">num_mem_objects</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>const
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_mem</a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*mem_objects</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_mem_migration_flags" target="pagedisplay">cl_mem_migration_flags</a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">flags</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_uint</a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">num_events_in_wait_list</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>const
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_event</a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*event_wait_list</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_event</a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*event</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"> command_queue </code> </span>
</dt>
<dd>
<p>
A valid host command-queue. The specified set of memory objects in
<code class="varname">mem_objects</code> will be migrated to the OpenCL device
associated with <code class="varname">command_queue</code> or to the host if the
<code class="constant">CL_MIGRATE_MEM_OBJECT_HOST</code> has been specified.
</p>
</dd>
<dt>
<span class="term"> <code class="varname"> num_mem_objects </code> </span>
</dt>
<dd>
<p>
The number of memory objects specified in <code class="varname">mem_objects</code>.
</p>
</dd>
<dt>
<span class="term"> <code class="varname"> mem_objects </code> </span>
</dt>
<dd>
<p>
A pointer to a list of memory objects.
</p>
</dd>
<dt>
<span class="term"> <code class="varname"> flags </code> </span>
</dt>
<dd>
<p>
A bit-field that is used to specify migration options. The table below
describes the possible values for flags.
</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">cl_mem_migration flags</th>
<th align="left">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left">
<code class="constant">CL_MIGRATE_MEM_OBJECT_HOST</code>
</td>
<td align="left">
This flag indicates that the specified set of memory objects
are to be migrated to the host, regardless of the target
command-queue.
</td>
</tr>
<tr>
<td align="left">
<code class="constant">CL_MIGRATE_MEM_OBJECT_-
CONTENT_UNDEFINED</code>
</td>
<td align="left">
This flag indicates that the contents of the set of memory
objects are undefined after migration. The specified set
of memory objects are migrated to the device associated with
<code class="varname">command_queue</code> without incurring the overhead
of migrating their contents.
</td>
</tr>
</tbody>
</table>
</div>
</dd>
<dt>
<span class="term">
<code class="varname">
event_wait_list, num_events_in_wait_list
</code>
</span>
</dt>
<dd>
<p>
Specify events that need to complete before this particular
command can be executed. If <code class="varname">event_wait_list</code>
is NULL, then this particular command does not wait on any
event to complete. If <code class="varname">event_wait_list</code> is
NULL, <code class="varname">num_events_in_wait_list</code> must be 0. If
<code class="varname">event_wait_list</code> is not NULL, the list of events
pointed to by <code class="varname">event_wait_list</code> must be valid
and <code class="varname">num_events_in_wait_list</code> must be greater
than 0. The events specified in <code class="varname">event_wait_list</code>
act as synchronization points. The context associated with events in
<code class="varname">event_wait_list</code> and <code class="varname">command_queue</code> must
be the same. The memory associated with <code class="varname">event_wait_list</code>
can be reused or freed after the function returns.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">
event
</code>
</span>
</dt>
<dd>
<p>
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. <code class="varname">event</code> 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. If the
<code class="varname">event_wait_list</code> and the <code class="varname">event</code>
arguments are not NULL, the <code class="varname">event</code> argument should not
refer to an element of the <code class="varname">event_wait_list</code> array.
</p>
</dd>
</dl>
</div>
</div>
<div class="refsect1">
<a id="notes"></a>
<h2>Notes</h2>
<p>
This section describes a mechanism for assigning which device an OpenCL memory object
resides. A user may wish to have more explicit control over the location of their memory objects
on creation. This could be used to:
</p>
<div class="itemizedlist">
<ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem" style="list-style-type: disc">Ensure that an object is allocated on a specific device prior to usage.</li>
<li class="listitem" style="list-style-type: disc">Preemptively migrate an object from one device to another.</li>
</ul>
</div>
<p>
</p>
<p>
Typically, memory objects are implicitly migrated to a device
for which enqueued commands, using the memory object, are targeted.
<code class="function">clEnqueueMigrateMemObjects</code> allows this migration to be explicitly
performed ahead of the dependent commands. This allows a user to preemptively change
the association of a memory object, through regular command queue scheduling, in
order to prepare for another upcoming command. This also permits an application to
overlap the placement of memory objects with other unrelated operations before
these memory objects are needed potentially hiding transfer latencies. Once
the event, returned from <code class="function">clEnqueueMigrateMemObjects</code>,
has been marked <code class="constant">CL_COMPLETE</code> the memory objects specified
in <code class="varname">mem_objects</code> have been successfully migrated to the device
associated with <code class="varname">command_queue</code>. The migrated memory object shall
remain resident on the device until another command is enqueued that either implicitly
or explicitly migrates it away.
</p>
<p>
<code class="function">clEnqueueMigrateMemObjects</code> can also be used to direct the initial
placement of a memory object, after creation, possibly avoiding the initial overhead
of instantiating the object on the first enqueued command to use it.
</p>
<p>
The user is responsible for managing the event dependencies, associated with this
command, in order to avoid overlapping access to memory objects. Improperly specified
event dependencies passed to <code class="function">clEnqueueMigrateMemObjects</code> could
result in undefined results.
</p>
</div>
<div class="refsect1">
<a id="errors"></a>
<h2>Errors</h2>
<p>
<code class="function">clEnqueueMigrateMemObjects</code> returns <span class="errorname">CL_SUCCESS</span>
if the function is executed successfully. 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_COMMAND_QUEUE</span> if <code class="varname">command_queue</code>
is not a valid host command_queue.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_CONTEXT</span> if the context associated with
<code class="varname">command_queue</code> and memory objects in <code class="varname">memobj</code>
are not the same or if the context associated with <code class="varname">command_queue</code>
and events in <code class="varname">event_wait_list</code> are not the same.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_MEM_OBJECT</span> if any of the memory objects in
<code class="varname">mem_objs</code> is not a valid memory object.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">num_mem_objects</code>
is zero or if <code class="varname">mem_objects</code> is NULL.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">flags</code> is
not 0 or is not any of the values described in the table above.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_EVENT_WAIT_LIST</span>
if <code class="varname">event_wait_list</code> is NULL and
<code class="varname">num_events_in_wait_list</code> &gt; 0,
or <code class="varname">event_wait_list</code> is not NULL and
<code class="varname">num_events_in_wait_list</code> is 0, or if event objects in
<code class="varname">event_wait_list</code> are not valid events.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_MEM_OBJECT_ALLOCATION_FAILURE</span> if there is a
failure to allocate memory for the specified set of memory objects in
<code class="varname">mem_objects</code>.
</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#namedest=clEnqueueMigrateMemObjects" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="clEnqueueMapBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapBuffer</span></span></a>,
<a class="citerefentry" href="clEnqueueMapImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapImage</span></span></a>
</p>
</div>
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