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| <title>clEnqueueSVMMap</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="clEnqueueSVMMap"></a> |
| <h1> |
| clEnqueueSVMMap |
| </h1> |
| <p> |
| Enqueues a command that will allow the host to update a region of a SVM buffer |
| </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">clEnqueueSVMMap</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="enums.html#cl_bool" target="pagedisplay">cl_bool</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">blocking_map</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_map_flags" target="pagedisplay">cl_map_flags</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">map_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">void</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*svm_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> |
| Must be a valid host command-queue. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> <code class="varname"> blocking_map </code> </span> |
| </dt> |
| <dd> |
| <p> |
| Indicates if the map operation is <code class="varname">blocking</code> or |
| <code class="varname">non-blocking</code>. |
| </p> |
| <p> |
| If <code class="varname">blocking_map</code> is <code class="constant">CL_TRUE</code>, |
| <code class="function">clEnqueueSVMMap</code> does not return until the application can |
| access the contents of the SVM region specified by |
| <code class="varname">svm_ptr</code> and <code class="varname">size</code> on the host. |
| </p> |
| <p> |
| If <code class="varname">blocking_map</code> is <code class="constant">CL_FALSE</code> |
| i.e. map operation is non-blocking, the region specified by |
| <code class="varname">svm_ptr</code> and <code class="varname">size</code> |
| cannot be used until the map 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 map command. |
| When the map command is completed, the application |
| can access the contents of the region |
| specified by <code class="varname">svm_ptr</code> and |
| <code class="varname">size</code>. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname">map_flags</code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| A bit-bield with the following supported values. |
| </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_map_flags</th> |
| <th align="left">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MAP_READ</code> |
| </td> |
| <td align="left"> |
| <p> |
| This flag specifies that the region being mapped in the memory |
| object is being mapped for reading. |
| </p> |
| |
| <p> |
| The pointer returned by |
| <code class="function">clEnqueueMap{Buffer|Image}</code> |
| is guaranteed to contain |
| the latest bits in the region being |
| mapped when the |
| <code class="function">clEnqueueMap{Buffer|Image}</code> |
| command has completed. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MAP_WRITE</code> |
| </td> |
| <td align="left"> |
| <p> |
| This flag specifies that the region being mapped in the memory |
| object is being mapped for writing. |
| </p> |
| |
| <p> |
| The pointer returned by |
| <code class="function">clEnqueueMap{Buffer|Image}</code> |
| is guaranteed to contain the latest bits in |
| the region being mapped when the |
| <code class="function">clEnqueueMap{Buffer|Image}</code> |
| command has completed. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MAP_WRITE_INVALIDATE_REGION</code> |
| </td> |
| <td align="left"> |
| <p> |
| This flag specifies that the region being mapped in the memory |
| object is being mapped for writing. |
| </p> |
| |
| <p> |
| The contents of the region being mapped are to be discarded. |
| This is typically the case |
| when the region being mapped is overwritten by the host. This |
| flag allows the implementation |
| to no longer guarantee that the pointer returned by |
| <code class="function">clEnqueueMap{Buffer|Image}</code> |
| contains the latest bits in the region being |
| mapped which can be a significant performance enhancement. |
| </p> |
| |
| <p> |
| <code class="constant">CL_MAP_READ</code> or <code class="constant">CL_MAP_WRITE</code> |
| and <code class="constant"> CL_MAP_WRITE_INVALIDATE_REGION</code> |
| are mutually exclusive. |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </dd> |
| <dt> |
| <span class="term"><code class="varname">svm_ptr</code> and <code class="varname">size</code></span> |
| </dt> |
| <dd> |
| <p> |
| A pointer to a memory region and size in bytes |
| that will be updated by the |
| host. If <code class="varname">svm_ptr</code> is allocated using |
| <a class="citerefentry" href="clSVMAlloc.html"><span class="citerefentry"><span class="refentrytitle">clSVMAlloc</span></span></a> |
| then it must be allocated from the same context |
| from which <code class="varname">command_queue</code> was created. |
| Otherwise the behavior is undefined. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname"> |
| event_wait_list, |
| </code> |
| <code class="varname"> |
| 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. |
| <a class="citerefentry" href="clEnqueueBarrierWithWaitList.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueBarrierWithWaitList</span></span></a> |
| can be used instead. 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> |
| Note that |
| since we are enqueuing a command with a SVM buffer, the region is already mapped in the host |
| address space. |
| </p> |
| <p> |
| <a class="citerefentry" href="clEnqueueSVMMap.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueSVMMap</span></span></a>, and |
| <a class="citerefentry" href="clEnqueueSVMUnmap.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueSVMUnmap</span></span></a> |
| act as synchronization points for the region |
| of the SVM buffer specified in these calls. |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="errors"></a> |
| <h2>Errors</h2> |
| <p> |
| <code class="function">clEnqueueSVMMap</code> returns <code class="constant">CL_SUCCESS</code> |
| 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_VALUE</span> if <code class="varname">svm_ptr</code> is NULL. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">size</code> |
| is 0 or if values specified in <code class="varname">map_flags</code> are not valid. |
| </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 map 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_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=clEnqueueSVMMap" 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. |
| Permission is hereby granted, free of charge, to any person obtaining a |
| copy of this software and/or associated documentation files (the |
| "Materials"), to deal in the Materials without restriction, including |
| without limitation the rights to use, copy, modify, merge, publish, |
| distribute, sublicense, and/or sell copies of the Materials, and to |
| permit persons to whom the Materials are furnished to do so, subject to |
| the condition that this copyright notice and permission notice shall be included |
| in all copies or substantial portions of the Materials. |
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