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<title>clEnqueueSVMMemcpy</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="clEnqueueSVMMemcpy"></a>
<h1>
clEnqueueSVMMemcpy
</h1>
<p>
Enqueues a command to do a memcpy operation.
</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">clEnqueueSVMMemcpy</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_bool</a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">blocking_copy</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*dst_ptr</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay"> void</a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*src_ptr</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">size</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>Refers to the host command-queue in which the
read / write command will be
queued. queued. If either <code class="varname">dst_ptr</code> or
<code class="varname">src_ptr</code> is allocated using
clSVMAlloc then the OpenCL context
allocated against must match that of
<code class="varname">command_queue</code>.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">blocking_copy</code>
</span>
</dt>
<dd>
<p>
Indicates if the copy operation is blocking or non-blocking.
</p>
<p>
If <code class="varname">blocking_copy</code> is <code class="constant">CL_TRUE</code>
i.e. the copy command is blocking, <code class="function">clEnqueueSVMMemcpy</code>
does not return until the buffer data has been
copied into memory pointed to by <code class="varname">dst_ptr</code>.
</p>
<p>
If <code class="varname">blocking_copy</code> is <code class="constant">CL_FALSE</code>
i.e. the copy command is non-blocking,
<code class="function">clEnqueueSVMMemcpy</code> queues a non-blocking
copy command and returns. The contents of
the buffer that <code class="varname">dst_ptr</code> point to cannot
be used until the copy command has completed. The <code class="varname">event</code>
argument returns an event object which can be used to
query the execution status of the read
command. When the copy command has completed, the
contents of the buffer that <code class="varname">dst_ptr</code>
points to can be used by the application.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">size</code>
</span>
</dt>
<dd>
<p>
The size in bytes of data being copied.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">dst_ptr</code>
</span>
</dt>
<dd>
<p>
The pointer to a host or SVM memory allocation where data is copied to.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">src_ptr</code>
</span>
</dt>
<dd>
<p>
The pointer to a memory region where data is copied from.
</p>
<p>
If the memory allocation(s) containing
<code class="varname">dst_ptr</code> and/or <code class="varname">src_ptr</code>
are allocated using <code class="function">clSVMAlloc</code>
and either is not allocated from the same context
from which <code class="varname">command_queue</code> was created the
behavior is undefined.
</p>
</dd>
<dt>
<span class="term"><code class="varname">event_wait_list</code> and <code class="varname">num_events_in_wait_list</code></span>
</dt>
<dd>
<p>
Specify events that need to complete before
<code class="function">clEnqueueSVMMemcpy</code> can be executed. If
<code class="varname">event_wait_list</code> is NULL, then
<code class="function">clEnqueueSVMMemcpy</code>
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="errors"></a>
<h2>Errors</h2>
<p>
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 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_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_EXEC_STATUS_ERROR_FOR_EVENTS_IN_WAIT_LIST</span>
if the copy operation is blocking and the execution status of any of
the events in <code class="varname">event_wait_list</code>
is a negative integer value.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span>
if <code class="varname">dst_ptr</code> or <code class="varname">src_ptr</code> are NULL.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_MEM_COPY_OVERLAP</span>
if the values specified for <code class="varname">dst_ptr</code>,
<code class="varname">src_ptr</code> and <code class="varname">size</code> result in
an overlapping copy.
</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=clEnqueueSVMMemcpy" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="sharedVirtualMemory.html"><span class="citerefentry"><span class="refentrytitle">Shared Virtual Memory Functions</span></span></a>
</p>
</div>
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