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| <title>clEnqueueUnmapMemObject</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="clEnqueueUnmapMemObject"></a> | |
| <h1> | |
| clEnqueueUnmapMemObject | |
| </h1> | |
| <p> | |
| Enqueues a command to unmap a previously mapped region of a memory object. | |
| </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">clEnqueueUnmapMemObject </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="abstractDataTypes.html" target="pagedisplay">cl_mem</a> | |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">memobj</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">*mapped_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">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"> memobj </code> </span> | |
| </dt> | |
| <dd> | |
| <p> | |
| A valid memory (buffer or image) object. The OpenCL context associated with | |
| <code class="varname">command_queue</code> and <code class="varname">memobj</code> must be the same. | |
| </p> | |
| </dd> | |
| <dt> | |
| <span class="term"> <code class="varname"> mapped_ptr </code> </span> | |
| </dt> | |
| <dd> | |
| <p> | |
| The host address returned by a previous call to | |
| <a class="citerefentry" href="clEnqueueMapBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapBuffer</span></span></a> | |
| or | |
| <a class="citerefentry" href="clEnqueueMapImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapImage</span></span></a> | |
| for <code class="varname">memobj</code>. | |
| </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 | |
| <code class="function">clEnqueueUnmapMemObject</code> can be | |
| executed. If <code class="varname">event_wait_list</code> is NULL, then | |
| <code class="function">clEnqueueUnmapMemObject</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 copy 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> | |
| Reads or writes from the host using the pointer returned by | |
| <a class="citerefentry" href="clEnqueueMapBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapBuffer</span></span></a> | |
| or <a class="citerefentry" href="clEnqueueMapImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapImage</span></span></a> | |
| are considered to be complete. | |
| </p> | |
| <p> | |
| <a class="citerefentry" href="clEnqueueMapBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapBuffer</span></span></a> and | |
| <a class="citerefentry" href="clEnqueueMapImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapImage</span></span></a> | |
| increment the mapped count of the memory object. The initial | |
| mapped count value of a memory object is zero. Multiple calls to | |
| <a class="citerefentry" href="clEnqueueMapBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapBuffer</span></span></a> or | |
| <a class="citerefentry" href="clEnqueueMapImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapImage</span></span></a> on the | |
| same memory object will increment this mapped count by appropriate number of calls. | |
| <code class="function">clEnqueueUnmapMemObject</code> decrements the mapped count of the | |
| memory object. | |
| </p> | |
| <p> | |
| <a class="citerefentry" href="clEnqueueMapBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapBuffer</span></span></a> | |
| and <a class="citerefentry" href="clEnqueueMapImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapImage</span></span></a> | |
| act as synchronization points for a region of the buffer object being mapped. | |
| </p> | |
| <h4><a id="id-1.6.5"></a>Accessing mapped regions of a memory object</h4> | |
| <p> | |
| This section describes the behavior of OpenCL commands that access | |
| mapped regions of a memory object. | |
| </p> | |
| <p> | |
| The contents of the region of a memory object and associated memory objects | |
| (sub-buffer objects or 1D image buffer objects that overlap this region) mapped | |
| for writing (i.e. <code class="constant">CL_MAP_WRITE</code> or | |
| <code class="constant">CL_MAP_WRITE_INVALIDATE_REGION</code> is set in <code class="varname">map_flags</code> | |
| argument to <a class="citerefentry" href="clEnqueueMapBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapBuffer</span></span></a> | |
| or <a class="citerefentry" href="clEnqueueMapImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapImage</span></span></a>) are | |
| considered to be undefined until this region is unmapped. | |
| </p> | |
| <p> | |
| Multiple commands in command-queues can map a region or overlapping regions of a memory | |
| object and associated memory objects (sub-buffer objects or 1D image buffer objects that | |
| overlap this region) for reading | |
| (i.e. <code class="varname">map_flags</code> = <code class="constant">CL_MAP_READ</code>). | |
| The contents of the regions of a memory object mapped for reading can also be read by kernels | |
| and other OpenCL commands (such as | |
| <a class="citerefentry" href="clEnqueueCopyBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueCopyBuffer</span></span></a>) | |
| executing on a device(s). | |
| </p> | |
| <p> | |
| Mapping (and unmapping) overlapped regions in a memory object and/or associated memory | |
| objects (sub-buffer objects or 1D image buffer objects that overlap this region) for writing | |
| is an error and will result in <code class="constant">CL_INVALID_OPERATION</code> error returned by | |
| <a class="citerefentry" href="clEnqueueMapBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapBuffer</span></span></a> | |
| or <a class="citerefentry" href="clEnqueueMapImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapImage</span></span></a>. | |
| </p> | |
| <p> | |
| If a memory object is currently mapped for writing, the application must ensure that the memory | |
| object is unmapped before any enqueued kernels or commands that read from or write to this | |
| memory object or any of its associated memory objects (sub-buffer or 1D image buffer objects) | |
| or its parent object (if the memory object is a sub-buffer or 1D image buffer object) begin | |
| execution; otherwise the behavior is undefined. | |
| </p> | |
| <p> | |
| If a memory object is currently mapped for reading, the application must ensure that the memory | |
| object is unmapped before any enqueued kernels or commands that write to this memory object | |
| or any of its associated memory objects (sub-buffer or 1D image buffer objects) or its parent | |
| object (if the memory object is a sub-buffer or 1D image buffer object) begin execution; | |
| otherwise the behavior is undefined. | |
| </p> | |
| <p> | |
| A memory object is considered as mapped if there are one or more active mappings for the | |
| memory object irrespective of whether the mapped regions span the entire memory object. | |
| </p> | |
| <p> | |
| Accessing the contents of the memory region referred to by the mapped pointer that has | |
| been unmapped is undefined. | |
| </p> | |
| <p> | |
| The mapped pointer returned by | |
| <a class="citerefentry" href="clEnqueueMapBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapBuffer</span></span></a> | |
| or <a class="citerefentry" href="clEnqueueMapImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapImage</span></span></a> can be used as | |
| <code class="varname">ptr</code> argument value to | |
| <a class="citerefentry" href="clEnqueueReadBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReadBuffer</span></span></a>, | |
| <a class="citerefentry" href="clEnqueueWriteBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueWriteBuffer</span></span></a>, | |
| <a class="citerefentry" href="clEnqueueReadBufferRect.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReadBufferRect</span></span></a>, | |
| <a class="citerefentry" href="clEnqueueWriteBufferRect.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueWriteBufferRect</span></span></a>, | |
| <a class="citerefentry" href="clEnqueueReadImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReadImage</span></span></a>, and | |
| <a class="citerefentry" href="clEnqueueWriteImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueWriteImage</span></span></a>, | |
| provided the rules described above are adhered to. | |
| </p> | |
| </div> | |
| <div class="refsect1"> | |
| <a id="errors"></a> | |
| <h2>Errors</h2> | |
| <p> | |
| <code class="function">clEnqueueUnmapMemObject</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_MEM_OBJECT</span> if <code class="varname">memobj</code> is not | |
| a valid memory object or is a pipe object. | |
| </li> | |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if | |
| <code class="varname">mapped_ptr</code> is not a valid pointer returned by | |
| <a class="citerefentry" href="clEnqueueMapBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapBuffer</span></span></a> | |
| or <a class="citerefentry" href="clEnqueueMapImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapImage</span></span></a> | |
| for <code class="varname">memobj</code>. | |
| </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_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> | |
| <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 <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> | |
| </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=165" 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> | |
| <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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