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| <title>clEnqueueWriteBuffer</title> | |
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| <a id="id-1"></a> | |
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| <div xmlns="" class="refnamediv"> | |
| <a xmlns="http://www.w3.org/1999/xhtml" id="clEnqueueWriteBuffer"></a> | |
| <h1> | |
| clEnqueueWriteBuffer | |
| </h1> | |
| <p> | |
| Enqueue commands to write to a buffer object from host memory. | |
| </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">clEnqueueWriteBuffer</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">buffer</var>, </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_write</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">offset</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>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">*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> | |
| Is a valid host command-queue in which the write command will be | |
| queued. <code class="varname">command_queue</code> and <code class="varname">buffer</code> must | |
| be created with the same OpenCL context. | |
| </p> | |
| </dd> | |
| <dt> | |
| <span class="term"> <code class="varname"> buffer </code> </span> | |
| </dt> | |
| <dd> | |
| <p> | |
| Refers to a valid buffer object. | |
| </p> | |
| </dd> | |
| <dt> | |
| <span class="term"> <code class="varname"> blocking_write </code> </span> | |
| </dt> | |
| <dd> | |
| <p> | |
| Indicates if the write operations are | |
| <code class="varname">blocking</code> or <code class="varname">nonblocking</code>. | |
| </p> | |
| <p> | |
| If <code class="varname">blocking_write</code> is <code class="constant">CL_TRUE</code>, the | |
| OpenCL implementation copies the data referred to by <code class="varname">ptr</code> | |
| and enqueues the write operation in the command-queue. The memory pointed | |
| to by <code class="varname">ptr</code> can be reused by the application after the | |
| <code class="function">clEnqueueWriteBuffer</code> call returns. | |
| </p> | |
| <p> | |
| If <code class="varname">blocking_write</code> is <code class="constant">CL_FALSE</code>, | |
| the OpenCL implementation will use <code class="varname">ptr</code> to perform a | |
| nonblocking write. As the write is non-blocking the implementation can return | |
| immediately. The memory pointed to by <code class="varname">ptr</code> cannot be reused | |
| by the application after the call returns. The <code class="varname">event</code> | |
| argument returns an event object which can be used to query the execution | |
| status of the write command. When the write command has completed, the memory | |
| pointed to by <code class="varname">ptr</code> can then be reused by the application. | |
| </p> | |
| </dd> | |
| <dt> | |
| <span class="term"> <code class="varname"> offset </code> </span> | |
| </dt> | |
| <dd> | |
| <p> | |
| The offset in bytes in the buffer object to write to. | |
| </p> | |
| </dd> | |
| <dt> | |
| <span class="term"> <code class="varname"> size </code> </span> | |
| </dt> | |
| <dd> | |
| <p> | |
| The size in bytes of data being written. | |
| </p> | |
| </dd> | |
| <dt> | |
| <span class="term"> <code class="varname"> ptr </code> </span> | |
| </dt> | |
| <dd> | |
| <p> | |
| The pointer to buffer in host memory where data is to be written from. | |
| </p> | |
| </dd> | |
| <dt> | |
| <span class="term"> <code class="varname">event_wait_list</code> | |
| , </span> | |
| <span class="term"> | |
| <code class="varname">num_events_in_wait_list</code> | |
| </span> | |
| </dt> | |
| <dd> | |
| <p> | |
| <code class="varname">event_wait_list</code> | |
| and <code class="varname">num_events_in_wait_list</code> 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 write 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="notes"></a> | |
| <h2>Notes</h2> | |
| <p> | |
| Calling <code class="function">clEnqueueWriteBuffer</code> to update the latest bits | |
| in a region of the buffer object with the <code class="varname">ptr</code> argument | |
| value set to <code class="varname">host_ptr</code> + <code class="varname">offset</code>, where | |
| <code class="varname">host_ptr</code> is a pointer to the memory region specified when the | |
| buffer object being written is created with <code class="constant">CL_MEM_USE_HOST_PTR</code>, | |
| must meet the following requirements in order to avoid undefined behavior: | |
| </p> | |
| <div class="itemizedlist"> | |
| <ul class="itemizedlist" style="list-style-type: disc; "> | |
| <li class="listitem" style="list-style-type: disc"> | |
| The host memory region given by <code class="varname">(host_ptr + offset, cb)</code> | |
| contains the latest bits when the enqueued write command begins execution. | |
| </li> | |
| <li class="listitem" style="list-style-type: disc"> | |
| The buffer object or memory objects created from this buffer object are not mapped. | |
| </li> | |
| <li class="listitem" style="list-style-type: disc"> | |
| The buffer object or memory objects created from this buffer object are not used | |
| by any command-queue until the read command has finished execution. | |
| </li> | |
| </ul> | |
| </div> | |
| </div> | |
| <div class="refsect1"> | |
| <a id="errors"></a> | |
| <h2>Errors</h2> | |
| <p> | |
| <code class="function">clEnqueueWriteBuffer</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 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 <code class="varname">buffer</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> | |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_MEM_OBJECT</span> if <code class="varname">buffer</code> | |
| is not a valid buffer object. | |
| </li> | |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if the region being written specified | |
| by (<code class="varname">offset</code>, <code class="varname">size</code>) is out of bounds or if | |
| <code class="varname">ptr</code> is a NULL value. | |
| </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_MISALIGNED_SUB_BUFFER_OFFSET</span> if | |
| <code class="varname">buffer</code> is a sub-buffer object and <code class="varname">offset</code> | |
| specified when the sub-buffer object is created is not aligned to | |
| <code class="constant">CL_DEVICE_MEM_BASE_ADDR_ALIGN</code> value for device associated | |
| with <code class="varname">queue</code>. | |
| </li> | |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_EXEC_STATUS_ERROR_FOR_EVENTS_IN_WAIT_LIST</span> if the read | |
| and write operations are 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_MEM_OBJECT_ALLOCATION_FAILURE</span> if there is a failure to | |
| allocate memory for data store associated with <code class="varname">buffer</code>. | |
| </li> | |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_OPERATION</span> if | |
| <a class="citerefentry" href="clEnqueueWriteBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueWriteBuffer</span></span></a> | |
| is called on <code class="varname">buffer</code> which has been | |
| created with <code class="constant">CL_MEM_HOST_READ_ONLY</code> or | |
| <code class="constant">CL_MEM_HOST_NO_ACCESS</code>. | |
| </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=110" target="OpenCL Spec">OpenCL Specification</a> | |
| </p> | |
| </div> | |
| <div class="refsect1"> | |
| <a id="seealso"></a> | |
| <h2>Also see</h2> | |
| <p> | |
| <a class="citerefentry" href="clEnqueueCopyBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueCopyBuffer</span></span></a>, | |
| <a class="citerefentry" href="clEnqueueReadBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReadBuffer</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> | |
| </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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