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| <title>clSetKernelArgSVMPointer</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="clSetKernelArgSVMPointer"></a> |
| <h1> |
| clSetKernelArgSVMPointer |
| </h1> |
| <p> |
| Set a SVM pointer as the argument value for a specific argument of a kernel. |
| </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">clSetKernelArgSVMPointer</strong> |
| (</code> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_kernel</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">kernel</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_uint</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">arg_index</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">*arg_value</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">kernel</code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| A valid kernel object. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname">arg_index</code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| The argument index. Arguments to the kernel are |
| referred by indices that go from 0 |
| for the leftmost argument to <code class="varname">n</code> - 1, |
| where <code class="varname">n</code> is the total |
| number of arguments declared by a kernel. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname">arg_value</code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| The SVM pointer that should be used as the argument value for |
| argument specified by <code class="varname">arg_index</code>. |
| The SVM pointer specified is the value used by all |
| API calls that enqueue <code class="varname">kernel</code> |
| (<a class="citerefentry" href="clEnqueueNDRangeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNDRangeKernel</span></span></a>) |
| until the argument value is changed by a call to |
| <code class="function">clSetKernelArgSVMPointer</code> |
| for <code class="varname">kernel</code>. |
| The SVM pointer can only be used for arguments that |
| are declared to be a pointer to <code class="code">global</code> or <code class="code">constant</code> |
| memory. The SVM pointer value must |
| be aligned according to the argument type. For |
| example, if the argument is declared to be |
| <code class="code">global float4 *p</code>, the SVM pointer |
| value passed for <code class="varname">p</code> must |
| be at a minimum aligned to a |
| <span class="type">float4</span>. The SVM pointer value |
| specified as the argument value can be the pointer returned by |
| <a class="citerefentry" href="clSVMAlloc.html"><span class="citerefentry"><span class="refentrytitle">clSVMAlloc</span></span></a> |
| or can be a pointer + offset into the SVM region. |
| </p> |
| </dd> |
| </dl> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="notes"></a> |
| <h2>Notes</h2> |
| <h4><a id="id-1.6.2"></a>Multiple Host Threads</h4> |
| <p> |
| An OpenCL API call is considered to be |
| <span class="emphasis"><em>thread-safe</em></span> if the internal state as managed by OpenCL remains |
| consistent when called simultaneously by multiple <span class="emphasis"><em>host</em></span> threads. |
| OpenCL API calls that are <span class="emphasis"><em>thread-safe</em></span> allow an application to |
| call these functions in multiple <span class="emphasis"><em>host</em></span> threads without having to |
| implement mutual exclusion across these <span class="emphasis"><em>host</em></span> threads i.e. they |
| are also re-entrant-safe. |
| </p> |
| <p> |
| |
| All OpenCL API calls are thread-safe except those that modify the state of cl_kernel objects: |
| <a class="citerefentry" href="clSetKernelArg.html"><span class="citerefentry"><span class="refentrytitle">clSetKernelArg</span></span></a>, |
| <a class="citerefentry" href="clSetKernelArgSVMPointer.html"><span class="citerefentry"><span class="refentrytitle">clSetKernelArgSVMPointer</span></span></a>, |
| <a class="citerefentry" href="clSetKernelExecInfo.html"><span class="citerefentry"><span class="refentrytitle">clSetKernelExecInfo</span></span></a> and |
| <a class="citerefentry" href="clCloneKernel.html"><span class="citerefentry"><span class="refentrytitle">clCloneKernel</span></span></a>. |
| </p> |
| <p> |
| <a class="citerefentry" href="clSetKernelArg.html"><span class="citerefentry"><span class="refentrytitle">clSetKernelArg</span></span></a> , |
| <a class="citerefentry" href="clSetKernelArgSVMPointer.html"><span class="citerefentry"><span class="refentrytitle">clSetKernelArgSVMPointer</span></span></a>, |
| <a class="citerefentry" href="clSetKernelExecInfo.html"><span class="citerefentry"><span class="refentrytitle">clSetKernelExecInfo</span></span></a> and |
| <a class="citerefentry" href="clCloneKernel.html"><span class="citerefentry"><span class="refentrytitle">clCloneKernel</span></span></a> |
| are safe to call from any host thread, and safe to call re-entrantly so long as concurrent calls to any |
| combination of these API calls operate on different cl_kernel objects. The state of the cl_kernel |
| object is undefined if |
| <a class="citerefentry" href="clSetKernelArg.html"><span class="citerefentry"><span class="refentrytitle">clSetKernelArg</span></span></a>, |
| <a class="citerefentry" href="clSetKernelArgSVMPointer.html"><span class="citerefentry"><span class="refentrytitle">clSetKernelArgSVMPointer</span></span></a>, |
| <a class="citerefentry" href="clSetKernelExecInfo.html"><span class="citerefentry"><span class="refentrytitle">clSetKernelExecInfo</span></span></a> or |
| <a class="citerefentry" href="clCloneKernel.html"><span class="citerefentry"><span class="refentrytitle">clCloneKernel</span></span></a> |
| are called from multiple host threads on the same cl_kernel object at the same |
| time. Please note that there are additional limitations as to which OpenCL APIs may be called |
| from OpenCL callback functions -- please see section 5.11. |
| </p> |
| <p> |
| The behavior of OpenCL APIs called from an interrupt or signal handler is |
| implementation-defined. |
| </p> |
| <p> |
| There is an inherent race condition in the |
| design of OpenCL that occurs between setting a kernel argument and using the kernel |
| with |
| <a class="citerefentry" href="clEnqueueNDRangeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNDRangeKernel</span></span></a>. |
| Another host thread might change the kernel arguments between when a host thread sets the |
| kernel arguments and then enqueues the kernel, causing the wrong kernel arguments |
| to be enqueued. Rather than attempt to share <span class="type">cl_kernel</span> objects among multiple host |
| threads, applications are strongly encouraged to make additional <span class="type">cl_kernel</span> objects |
| for kernel functions for each host thread. |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="errors"></a> |
| <h2>Errors</h2> |
| <p> |
| <code class="function">clSetKernelArgSVMPointer</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_KERNEL</span> if <code class="varname">kernel</code> |
| is not a valid kernel object. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_ARG_INDEX</span> if <code class="varname">arg_index</code> |
| is not a valid argument index. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_ARG_VALUE</span> if <code class="varname">arg_value</code> |
| specified is not a valid value. |
| </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=226" target="OpenCL Spec">OpenCL Specification</a> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="seealso"></a> |
| <h2>Also see</h2> |
| <p> |
| <a class="citerefentry" href="clSetKernelArg.html"><span class="citerefentry"><span class="refentrytitle">clSetKernelArg</span></span></a>, |
| <a class="citerefentry" href="clCreateKernel.html"><span class="citerefentry"><span class="refentrytitle">clCreateKernel</span></span></a>, |
| <a class="citerefentry" href="clCreateKernelsInProgram.html"><span class="citerefentry"><span class="refentrytitle">clCreateKernelsInProgram</span></span></a>, |
| <a class="citerefentry" href="clReleaseKernel.html"><span class="citerefentry"><span class="refentrytitle">clReleaseKernel</span></span></a>, |
| <a class="citerefentry" href="clRetainKernel.html"><span class="citerefentry"><span class="refentrytitle">clRetainKernel</span></span></a>, |
| <a class="citerefentry" href="clGetKernelInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetKernelInfo</span></span></a>, |
| <a class="citerefentry" href="clGetKernelWorkGroupInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetKernelWorkGroupInfo</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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