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| <title>clSetEventCallback</title> | |
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| <a id="id-1"></a> | |
| <div class="titlepage"></div> | |
| <div xmlns="" class="refnamediv"> | |
| <a xmlns="http://www.w3.org/1999/xhtml" id="clSetEventCallback"></a> | |
| <h1> | |
| clSetEventCallback | |
| </h1> | |
| <p> | |
| Registers a user callback function for a specific command execution status. | |
| </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">clSetEventCallback</strong> | |
| (</code> | |
| <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>, </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_int</a> | |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">command_exec_callback_type</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> (CL_CALLBACK <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*pfn_event_notify) | |
| (<a class="link" href="abstractDataTypes.html" target="pagedisplay">cl_event</a> event, <a class="link" href="scalarDataTypes.html" target="_top">cl_int</a> event_command_exec_status, | |
| <a class="link" href="scalarDataTypes.html" target="pagedisplay">void</a> *user_data</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">*user_data</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>A valid event object.</p> | |
| </dd> | |
| <dt> | |
| <span class="term"> | |
| <code class="varname">command_exec_callback_type</code> | |
| </span> | |
| </dt> | |
| <dd> | |
| <p> | |
| Specifies the command execution status for which | |
| the callback is registered. The command execution callback values for | |
| which a callback can be registered are <code class="constant">CL_SUBMITTED</code>, | |
| <code class="constant">CL_RUNNING</code>, or <code class="constant">CL_COMPLETE</code>. | |
| There is no guarantee that the callback functions registered for various | |
| execution status values for an event will be called in the exact order | |
| that the execution status of a command changes. Furthermore, it should | |
| be noted that receiving a call back for an event with a status other than | |
| <code class="constant">CL_COMPLETE</code>, in no way implies that the memory model | |
| or execution model as defined by the OpenCL specification has changed. For | |
| example, it is not valid to assume that a corresponding memory transfer has | |
| completed unless the event is in a state <code class="constant">CL_COMPLETE</code>. | |
| </p> | |
| <p> | |
| The callback function registered for a | |
| <code class="varname">command_exec_callback_type</code> value of | |
| <code class="constant">CL_COMPLETE</code> will be called when the command has | |
| completed successfully or is abnormally terminated. | |
| </p> | |
| </dd> | |
| <dt> | |
| <span class="term"> | |
| <code class="varname">pfn_event_notify</code> | |
| </span> | |
| </dt> | |
| <dd> | |
| <p> | |
| The event callback function that can be | |
| registered by the application. This callback function may be called | |
| asynchronously by the OpenCL implementation. It is the application's | |
| responsibility to ensure that the callback function is thread-safe. The | |
| parameters to this callback function are: | |
| </p> | |
| <div class="itemizedlist"> | |
| <ul class="itemizedlist" style="list-style-type: disc; "> | |
| <li class="listitem" style="list-style-type: disc"><code class="varname">event</code> is the event object for which the | |
| callback function is invoked. | |
| </li> | |
| <li class="listitem" style="list-style-type: disc"><code class="varname">event_command_exec_status</code> represents the | |
| execution status of command for which this callback function is | |
| invoked. See the table of values for <code class="varname">param_value</code> for | |
| <a class="citerefentry" href="clGetEventInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetEventInfo</span></span></a> | |
| for the command execution status values. If the callback is called as the | |
| result of the command associated with event being abnormally terminated, | |
| an appropriate error code for the error that caused the termination | |
| will be passed to <code class="varname">event_command_exec_status</code> instead. | |
| </li> | |
| <li class="listitem" style="list-style-type: disc"><code class="varname">user_data</code> is a pointer to user supplied data. | |
| </li> | |
| </ul> | |
| </div> | |
| </dd> | |
| <dt> | |
| <span class="term"> | |
| <code class="varname">user_data</code> | |
| </span> | |
| </dt> | |
| <dd> | |
| <p> | |
| Will be passed as the | |
| <code class="varname">user_data</code> argument when <code class="varname">pfn_notify</code> | |
| is called. <code class="varname">user_data</code> can be NULL. | |
| </p> | |
| </dd> | |
| </dl> | |
| </div> | |
| </div> | |
| <div class="refsect1"> | |
| <a id="notes"></a> | |
| <h2>Notes</h2> | |
| <p> | |
| The registered callback function will be called when the execution status of command | |
| associated with <code class="varname">event</code> changes to an execution status equal to or | |
| past the status specified by <code class="varname">command_exec_status</code>. | |
| </p> | |
| <p> | |
| Each call to <code class="function">clSetEventCallback</code> registers the specified user | |
| callback function on a callback stack associated with <code class="varname">event</code>. The | |
| order in which the registered user callback functions are called is undefined. | |
| </p> | |
| <p> | |
| All callbacks registered for an event object must be called. All enqueued callbacks shall | |
| be called before the event object is destroyed. Callbacks must return promptly. The | |
| behavior of calling expensive system routines, OpenCL API calls to create contexts | |
| or command-queues, or blocking OpenCL operations from the following list below, | |
| in a callback is undefined. | |
| </p> | |
| <div class="itemizedlist"> | |
| <ul class="itemizedlist" style="list-style-type: disc; "> | |
| <li class="listitem" style="list-style-type: disc"> | |
| <a class="citerefentry" href="clFinish.html"> | |
| <span class="citerefentry"> | |
| <span class="refentrytitle">clFinish</span> | |
| </span> | |
| </a> | |
| </li> | |
| <li class="listitem" style="list-style-type: disc"> | |
| <a class="citerefentry" href="clWaitForEvents.html"> | |
| <span class="citerefentry"> | |
| <span class="refentrytitle">clWaitForEvents</span> | |
| </span> | |
| </a> | |
| </li> | |
| <li class="listitem" style="list-style-type: disc"> | |
| blocking calls to | |
| <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="clEnqueueWriteBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueWriteBuffer</span></span></a>, and | |
| <a class="citerefentry" href="clEnqueueWriteBufferRect.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueWriteBufferRect</span></span></a></li> | |
| <li class="listitem" style="list-style-type: disc"> | |
| blocking calls to | |
| <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></li> | |
| <li class="listitem" style="list-style-type: disc"> | |
| blocking calls to | |
| <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></li> | |
| <li class="listitem" style="list-style-type: disc"> | |
| blocking calls to | |
| <a class="citerefentry" href="clBuildProgram.html"><span class="citerefentry"><span class="refentrytitle">clBuildProgram</span></span></a>, | |
| <a class="citerefentry" href="clCompileProgram.html"><span class="citerefentry"><span class="refentrytitle">clCompileProgram</span></span></a>, | |
| or <a class="citerefentry" href="clLinkProgram.html"><span class="citerefentry"><span class="refentrytitle">clLinkProgram</span></span></a>. | |
| </li> | |
| <li class="listitem" style="list-style-type: disc"> | |
| blocking calls to | |
| <a class="citerefentry" href="clEnqueueSVMMemcpy.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueSVMMemcpy</span></span></a>, | |
| or <a class="citerefentry" href="clEnqueueSVMMap.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueSVMMap</span></span></a>. | |
| </li> | |
| </ul> | |
| </div> | |
| <p> | |
| If an application needs to wait for completion of a routine from the above list in a | |
| callback, please use the non-blocking form of the function, and assign a completion | |
| callback to it to do the remainder of your work. Note that when a callback (or other | |
| code) enqueues commands to a command-queue, the commands are not required to begin | |
| execution until the queue is flushed. In standard usage, blocking enqueue calls serve | |
| this role by implicitly flushing the queue. Since blocking calls are not permitted in | |
| callbacks, those callbacks that enqueue commands on a command queue should either | |
| call <a class="citerefentry" href="clFlush.html"><span class="citerefentry"><span class="refentrytitle">clFlush</span></span></a> | |
| on the queue before returning or arrange for | |
| <a class="citerefentry" href="clFlush.html"><span class="citerefentry"><span class="refentrytitle">clFlush</span></span></a> to be called | |
| later on another thread. | |
| </p> | |
| </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_EVENT</span> if <code class="varname">event</code> | |
| is not a valid event object. | |
| </li> | |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">pfn_event_notify</code> | |
| is NULL or if <code class="varname">command_exec_callback_type</code> is not | |
| <code class="constant">CL_SUBMITTED</code>, <code class="constant">CL_RUNNING</code> or | |
| <code class="constant">CL_COMPLETE</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=255" target="OpenCL Spec">OpenCL Specification</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 | |
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