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| <title>clGetEventInfo</title> |
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| <div class="refentry"> |
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| <div class="titlepage"></div> |
| <div xmlns="" class="refnamediv"> |
| <a xmlns="http://www.w3.org/1999/xhtml" id="clGetEventInfo"></a> |
| <h1>clGetEventInfo</h1> |
| <p> |
| Returns information about the event 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="_top">cl_int</a> |
| <strong class="fsfunc"> |
| clGetEventInfo |
| </strong> |
| (</code> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="_top">cl_event</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">event</var>, </td> |
| </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_event_info" target="_top">cl_event_info</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">param_name</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">param_value_size</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">void</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*param_value</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*param_value_size_ret</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"> |
| event |
| </code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| Specifies the event object being queried. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname"> |
| param_value |
| </code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| A pointer to memory where the appropriate result being queried is returned. If <code class="varname">param_value</code> is NULL, it is ignored. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname"> |
| param_value_size |
| </code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| Specifies the size in bytes of memory pointed to by <code class="varname">param_value</code>. This size must be greater than or equal to the size of the return type as described in the table below. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname"> |
| param_value_size_ret |
| </code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| Returns the actual size in bytes of data copied to <code class="varname">param_value</code>. If |
| <code class="varname">param_value_size_ret</code> is NULL, it is ignored. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname"> |
| param_name |
| </code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| Specifies the information to query. The list of supported <code class="varname">param_name</code> types and the information returned in <code class="varname">param_value</code> by <code class="function">clGetEventInfo</code> is described in the table below: |
| |
| </p> |
| <div class="informaltable"> |
| <table border="1"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| <col align="left" class="col2" /> |
| <col align="left" class="col3" /> |
| </colgroup> |
| <thead> |
| <tr> |
| <th align="left">cl_event_info</th> |
| <th align="left">Return Type</th> |
| <th align="left">Information returned in <code class="varname">param_value</code></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_EVENT_COMMAND_QUEUE</code> |
| </td> |
| <td align="left">cl_command_queue</td> |
| <td align="left"> |
| Return the command-queue associated with <code class="varname">event</code>. |
| For user event objects, a NULL value is returned. |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_EVENT_CONTEXT</code> |
| </td> |
| <td align="left">cl_context</td> |
| <td align="left"> |
| Return the context associated with <code class="varname">event</code>. |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_EVENT_COMMAND_TYPE</code> |
| </td> |
| <td align="left">cl_command_type</td> |
| <td align="left">Return the command associated with <code class="varname">event</code>. |
| Can be one of the following values: |
| <div class="literallayout"><p>CL_COMMAND_NDRANGE_KERNEL<br /> |
| CL_COMMAND_TASK<br /> |
| CL_COMMAND_NATIVE_KERNEL<br /> |
| CL_COMMAND_READ_BUFFER<br /> |
| CL_COMMAND_WRITE_BUFFER<br /> |
| CL_COMMAND_COPY_BUFFER<br /> |
| CL_COMMAND_READ_IMAGE<br /> |
| CL_COMMAND_WRITE_IMAGE<br /> |
| CL_COMMAND_COPY_IMAGE<br /> |
| CL_COMMAND_COPY_BUFFER_TO_IMAGE<br /> |
| CL_COMMAND_COPY_IMAGE_TO_BUFFER<br /> |
| CL_COMMAND_MAP_BUFFER<br /> |
| CL_COMMAND_MAP_IMAGE<br /> |
| CL_COMMAND_UNMAP_MEM_OBJECT<br /> |
| CL_COMMAND_MARKER<br /> |
| CL_COMMAND_ACQUIRE_GL_OBJECTS<br /> |
| CL_COMMAND_RELEASE_GL_OBJECTS<br /> |
| CL_COMMAND_READ_BUFFER_RECT<br /> |
| CL_COMMAND_WRITE_BUFFER_RECT<br /> |
| CL_COMMAND_COPY_BUFFER_RECT<br /> |
| CL_COMMAND_USER<br /> |
| CL_COMMAND_GL_FENCE_SYNC_OBJECT_KHR <br /> |
| (if cl_khr_gl_event is enabled)<br /> |
| CL_COMMAND_ACQUIRE_D3D10_OBJECTS_KHR<br /> |
| (if cl_khr_d3d10_sharing is enabled)<br /> |
| CL_COMMAND_RELEASE_D3D10_OBJECTS_KHR <br /> |
| (if cl_khr_d3d10_sharing is enabled)</p></div> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_EVENT_COMMAND_ EXECUTION_STATUS</code> |
| </td> |
| <td align="left">cl_int</td> |
| <td align="left"> |
| Return the execution status of the command identified by <code class="varname">event</code>. The valid values are: |
| <p>CL_QUEUED (command has been enqueued in the command-queue),</p> |
| <p>CL_SUBMITTED (enqueued command has been submitted by the host to the device associated with the command-queue),</p> |
| <p>CL_RUNNING (device is currently executing this command),</p> |
| <p>CL_COMPLETE (the command has completed), or</p> |
| <p>Error code given by a negative integer value. (command was abnormally terminated – this |
| may be caused by a bad memory access etc.)</p> |
| <p>These error codes come from the same set of error codes that are returned from the platform or runtime API calls as return values or <code class="varname">errcode_ret</code> values.</p> |
| <p> |
| The error code values are negative, and event state values are positive. The event state values are ordered from the largest value (CL_QUEUED) for the first or initial state to the smallest value (CL_COMPLETE or negative integer value) for the last or complete state. The value of CL_COMPLETE and CL_SUCCESS are the same. |
| </p> |
| |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_EVENT_REFERENCE_COUNT</code> |
| </td> |
| <td align="left">cl_uint</td> |
| <td align="left"> |
| Return the <code class="varname">event</code> reference count. The reference count returned should be considered immediately stale. It is unsuitable for general use in applications. This feature is provided for identifying memory leaks. |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </dd> |
| </dl> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="notes"></a> |
| <h2>Notes</h2> |
| <p> |
| Using <code class="function">clGetEventInfo</code> to determine if a command identified by event has finished execution (i.e. <code class="constant">CL_EVENT_COMMAND_EXECUTION_STATUS</code> returns <code class="constant">CL_COMPLETE</code>) is not a synchronization point. There are no guarantees that the memory objects being modified by command associated with <code class="varname">event</code> will be visible to other enqueued commands. |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="errors"></a> |
| <h2>Errors</h2> |
| <p> |
| Returns <span class="errorname">CL_SUCCESS</span> if the function executed successfully, or one of the errors below: |
| </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_VALUE</span> if <code class="varname">param_name</code> is not valid, or if size in |
| bytes specified by <code class="varname">param_value_size</code> is less than size of return type as described |
| in the table above and <code class="varname">param_value</code> is not NULL. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if information to query given in <code class="varname">param_name</code> |
| cannot be queried for event. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_EVENT</span> if <code class="varname">event</code> is not a valid |
| <code class="varname">event</code> object. |
| </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="http://www.khronos.org/registry/cl/specs/opencl-1.1.pdf#page=142" target="OpenCL Spec">OpenCL Specification</a> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="seealso"></a> |
| <h2>Also see</h2> |
| <p> |
| <a class="citerefentry" href="clReleaseEvent.html"><span class="citerefentry"><span class="refentrytitle">clReleaseEvent</span></span></a>, |
| <a class="citerefentry" href="clRetainEvent.html"><span class="citerefentry"><span class="refentrytitle">clRetainEvent</span></span></a>, |
| <a class="citerefentry" href="clWaitForEvents.html"><span class="citerefentry"><span class="refentrytitle">clWaitForEvents</span></span></a>, |
| <a class="citerefentry" href="gl_event.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_gl_event</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 © 2007-2010 The Khronos Group Inc. |
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| 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 |
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