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| <title>clEnqueueSVMMemcpy</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="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> > 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#page=180" 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> |
| <div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2015 The Khronos Group Inc. |
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