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| <title>clSetMemObjectDestructorCallback</title> |
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| </head> |
| <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="clSetCommandQueueProperty"></a> |
| <h1>clSetMemObjectDestructorCallback</h1> |
| <p> |
| Registers a user callback function with 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">clSetMemObjectDestructorCallback</strong> |
| (</code> |
| <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> |
| </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_notify</var>) |
| (<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_mem</a> memobj, </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>), </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">memobj</code> |
| </span> |
| </dt> |
| <dd> |
| <p>A valid memory object.</p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname">pfn_notify</code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| The 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">memobj</code>: the memory object being deleted. |
| When the user callback is called by the implementation, this memory object is |
| no longer valid. <code class="varname">memobj</code> is only provided for reference purposes. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><code class="varname">user_data</code>: a pointer to user supplied data. |
| </li> |
| </ul> |
| </div> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname">user_data</code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| Data which 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> |
| Each call to <code class="function">clSetMemObjectDestructorCallback</code> registers |
| the specified user callback function on a callback stack associated with |
| <code class="varname">memobj</code>. The registered user callback functions are called in the |
| reverse order in which they were registered. The user callback functions are called |
| and then the memory object's resources are freed and the memory object is deleted. This |
| provides a mechanism for the application (and libraries) using <code class="varname">memobj</code> |
| to be notified when the memory referenced by <code class="varname">host_ptr</code>, specified |
| when the memory object is created and used as the storage bits for the memory object, |
| can be reused or freed. |
| </p> |
| <p> |
| When the user callback function is called by the implementation, the contents of |
| the memory region pointed to by <code class="varname">host_ptr</code> (if the memory object is |
| created with <code class="constant">CL_MEM_USE_HOST_PTR</code>) are undefined. The callback |
| function is typically used by the application to either free or reuse the memory |
| region pointed to by <code class="varname">host_ptr</code>. |
| </p> |
| <p> |
| 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>, |
| <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> |
| </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> |
| <p> |
| The user callback function may not call OpenCL APIs with the memory object for which |
| the callback function is invoked and for such cases the behavior of OpenCL APIs is |
| considered to be undefined. |
| </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_MEM_OBJECT</span> if <code class="varname">memobj</code> is not a valid memory object. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">pfn_notify</code> is NULL. |
| </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-1.2.pdf#page=119" target="OpenCL Spec">OpenCL Specification</a> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="seealso"></a> |
| <h2>Also see</h2> |
| <p> |
| <a class="citerefentry" href="clCreateCommandQueue.html"><span class="citerefentry"><span class="refentrytitle">clCreateCommandQueue</span></span></a>, |
| <a class="citerefentry" href="clGetCommandQueueInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetCommandQueueInfo</span></span></a>, |
| <a class="citerefentry" href="clReleaseCommandQueue.html"><span class="citerefentry"><span class="refentrytitle">clReleaseCommandQueue</span></span></a>, |
| <a class="citerefentry" href="clRetainCommandQueue.html"><span class="citerefentry"><span class="refentrytitle">clRetainCommandQueue</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 © 2007-2011 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 |
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