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<title>clEnqueueSVMFree</title>
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<body>
<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="clEnqueueSVMFree"></a>
<h1>
clEnqueueSVMFree
</h1>
<p>
Enqueues a command to free the shared virtual memory allocated using clSVMAlloc or a shared system memory pointer.
</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">clEnqueueSVMFree</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_svm_pointers</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">*svm_pointers[]</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> (CL_CALLBACK  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*pfn_free_func)
(<a class="link" href="abstractDataTypes.html" target="pagedisplay"> cl_command_queue</a> queue, <a class="link" href="scalarDataTypes.html" target="_top"> cl_uint</a> num_svm_pointers,
<a class="link" href="scalarDataTypes.html" target="pagedisplay"> void</a> *svm_pointers[]</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"> *user_data</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">*user_data</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.</p>
</dd>
<dt>
<span class="term">
<code class="varname">svm_pointers and num_svm_pointers</code>
</span>
</dt>
<dd>
<p>
Specify shared virtual memory pointers to be freed. Each
pointer in <code class="varname">svm_pointers</code> that was
allocated using
<a class="citerefentry" href="clSVMAlloc.html"><span class="citerefentry"><span class="refentrytitle">clSVMAlloc</span></span></a>
must have been allocated from the
same context from which <code class="varname">command_queue</code>
was created. The memory associated with
<code class="varname">svm_pointers</code> can be reused or
freed after the function returns.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">pfn_free_func</code>
</span>
</dt>
<dd>
<p>
Specifies the callback
function to be called to free the SVM pointers.
<code class="varname">pfn_free_func</code> takes four arguments:
<code class="varname">queue</code> which is the command queue in which
<code class="function">clEnqueueSVMFree</code> was enqueued, the
count and list of SVM pointers to free and <code class="varname">user_data</code>
which is a pointer to user specified data.
If <code class="varname">pfn_free_func</code> is NULL, all pointers specified in
<code class="varname">svm_pointers</code> must be allocated using
<a class="citerefentry" href="clSVMAlloc.html"><span class="citerefentry"><span class="refentrytitle">clSVMAlloc</span></span></a>
and the OpenCL implementation will free
these SVM pointers. <code class="varname">pfn_free_func</code> must
be a valid callback function if any SVM pointer to be
freed is a shared system memory pointer i.e. not allocated
using <a class="citerefentry" href="clSVMAlloc.html"><span class="citerefentry"><span class="refentrytitle">clSVMAlloc</span></span></a>.
If <code class="varname">pfn_free_func</code>
is a valid callback function, the OpenCL implementation
will call <code class="varname">pfn_free_func</code> to free all the
SVM pointers specified in <code class="varname">svm_pointers</code>.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">user_data</code>
</span>
</dt>
<dd>
<p>
Will be passed as the
<code class="varname">user_data</code> argument when <code class="varname">pfn_free_func</code>
is called. <code class="varname">user_data</code> can be NULL.
</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">clEnqueueSVMFree</code> can be executed. If
<code class="varname">event_wait_list</code> is NULL, then
<code class="function">clEnqueueSVMFree</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_VALUE</span> if
<code class="varname">num_svm_pointers</code> is 0 and
<code class="varname">svm_pointers</code> is non-NULL, or if <code class="varname">svm_pointers</code>
is NULL and <code class="varname">num_svm_pointers</code> is not 0.
</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_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=clEnqueueSVMFree" 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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