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| <title>clSetKernelArg</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="clSetKernelArg"></a> |
| <h1> |
| clSetKernelArg |
| </h1> |
| <p> |
| Set 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">clSetKernelArg</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><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">arg_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">*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> |
| A pointer to data that should be used as the argument value for argument |
| specified by <code class="varname">arg_index</code>. The argument data pointed to by |
| <code class="varname">arg_value</code> is copied and the <code class="varname">arg_value</code> |
| pointer can therefore be reused by the application after |
| <code class="function">clSetKernelArg</code> returns. The argument value 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">clSetKernelArg</code> for <code class="varname">kernel</code>. |
| </p> |
| <p> |
| If the argument is a memory object (buffer, pipe, image or image array), the |
| <code class="varname">arg_value</code> entry will be a pointer to the appropriate |
| buffer, pipe, image or image array object. The memory object must be created |
| with the context associated with the kernel object. If the argument |
| is a buffer object, the <code class="varname">arg_value</code> pointer can be |
| NULL or point to a NULL value in which case a NULL value will be used |
| as the value for the argument declared as a pointer to |
| <a class="citerefentry" href="global.html"><span class="citerefentry"><span class="refentrytitle">global</span></span></a> |
| or <a class="citerefentry" href="constant.html"><span class="citerefentry"><span class="refentrytitle">constant</span></span></a> |
| memory in the kernel. If the argument is declared with the |
| <a class="citerefentry" href="local.html"><span class="citerefentry"><span class="refentrytitle">local</span></span></a> |
| qualifier, the <code class="varname">arg_value</code> entry must be NULL. If the |
| argument is of type <span class="type">sampler_t</span>, the <code class="varname">arg_value</code> entry |
| must be a pointer to the sampler object. If the argument is of type |
| <span class="type">queue_t</span>, the <code class="varname">arg_value</code> entry must be a |
| pointer to the device queue object. |
| </p> |
| <p> |
| If the argument is declared to be a pointer of a built-in scalar or vector |
| type, or a user defined structure type in the global or constant address |
| space, the memory object specified as argument value must be a buffer |
| object (or NULL). If the argument is declared with the |
| <a class="citerefentry" href="constant.html"><span class="citerefentry"><span class="refentrytitle">constant</span></span></a> |
| qualifier, the size in bytes of the memory object cannot |
| exceed <code class="constant">CL_DEVICE_MAX_CONSTANT_BUFFER_SIZE</code> |
| and the number of arguments declared as pointers to |
| <a class="citerefentry" href="constant.html"><span class="citerefentry"><span class="refentrytitle">constant</span></span></a> |
| memory cannot exceed <code class="constant">CL_DEVICE_MAX_CONSTANT_ARGS</code>. |
| </p> |
| <p> |
| The memory object specified as argument value must be a pipe object if |
| the argument is declared with the <code class="code">pipe</code> qualifier. |
| </p> |
| <p> |
| The memory object specified as argument value must be a 2D image object if the argument is |
| declared to be of type <a class="link" href="abstractDataTypes.html" target="pagedisplay">image2d_t</a>. |
| The memory object specified as argument value must be a 2D |
| image object with image channel order = |
| <code class="constant">CL_DEPTH</code> if the argument is |
| declared to be of type |
| <a class="link" href="abstractDataTypes.html" target="pagedisplay">image2d_depth_t</a>. |
| The memory object |
| specified as argument value must be a 3D image object if argument is declared to be of type |
| <a class="link" href="abstractDataTypes.html" target="pagedisplay">image3d_t</a>. The memory object specified as |
| argument value must be a 1D image object if the argument is declared to be of type |
| <a class="link" href="abstractDataTypes.html" target="pagedisplay">image1d_t</a>. The memory object specified as |
| argument value must be a 1D image buffer object if the argument is declared to be of type |
| <a class="link" href="abstractDataTypes.html" target="pagedisplay">image1d_buffer_t</a>. |
| The memory object specified as argument value must be a 1D image array object if argument |
| is declared to be of type <a class="link" href="abstractDataTypes.html" target="pagedisplay">image1d_array_t</a>. |
| The memory object specified as argument value must be a 2D image array object if argument is |
| declared to be of type <a class="link" href="abstractDataTypes.html" target="pagedisplay">image2d_array_t</a>. |
| The memory object specified as argument value must be a 2D image |
| array object with image channel order = |
| <code class="constant">CL_DEPTH</code> if argument is declared to be of type |
| <a class="link" href="abstractDataTypes.html" target="pagedisplay">image2d_array_depth_t</a>. |
| </p> |
| <p> |
| For all other kernel arguments, the <code class="varname">arg_value</code> entry |
| must be a pointer to the actual data to be used as argument value. |
| </p> |
| <p> |
| If the |
| <a class="citerefentry" href="cl_khr_gl_msaa_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_gl_msaa_sharing</span></span></a> |
| extension is supported, |
| if the argument is a multi-sample 2D image, the |
| <code class="varname">arg_value</code> entry must be a |
| pointer to a multisample image object. If the |
| argument is a multi-sample 2D depth image, the |
| <code class="varname">arg_value</code> entry |
| must be a pointer to a multisample depth image |
| object. If the argument is a multi-sample 2D |
| image array, the <code class="varname">arg_value</code> |
| entry must be a pointer to a multi-sample |
| image array object. If the |
| argument is a multi-sample 2D depth image array, |
| the <code class="varname">arg_value</code> entry must |
| be a pointer to a |
| multi-sample depth image array object. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname"> |
| arg_size |
| </code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| Specifies the size of the argument value. If the argument is |
| a memory object, the size is the size of the memory |
| object. For arguments declared with the |
| <a class="citerefentry" href="local.html"><span class="citerefentry"><span class="refentrytitle">local</span></span></a> |
| qualifier, the size specified will be the size in bytes |
| of the buffer that must be allocated for the |
| <a class="citerefentry" href="local.html"><span class="citerefentry"><span class="refentrytitle">local</span></span></a> |
| argument. If the argument is of type <span class="type">sampler_t</span>, |
| the <code class="varname">arg_size</code> value must be equal to |
| <code class="code">sizeof(cl_sampler)</code>. |
| If the argument is of type <span class="type">queue_t</span>, |
| the <code class="varname">arg_size</code> value must be equal |
| to <code class="code">sizeof(cl_command_queue)</code>. |
| For all other arguments, the size will |
| be the size of argument type. |
| </p> |
| </dd> |
| </dl> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="notes"></a> |
| <h2>Notes</h2> |
| <p> |
| A kernel object does not update the reference count for objects such as memory, sampler |
| objects specified as argument values by <code class="function">clSetKernelArg</code>. Users may |
| not rely on a kernel object to retain objects specified as argument values to the kernel. |
| </p> |
| <p> |
| Implementations shall not allow <span class="type">cl_kernel</span> objects to hold reference counts to |
| <span class="type">cl_kernel</span> arguments, because no mechanism is provided for the user to tell the kernel |
| to release that ownership right. If the kernel holds ownership rights on kernel args, |
| that would make it impossible for the user to tell with certainty when he may safely |
| release user allocated resources associated with OpenCL objects such as the <span class="type">cl_mem</span> |
| backing store used with <code class="constant">CL_MEM_USE_HOST_PTR</code>. |
| </p> |
| <h4><a id="id-1.6.4"></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">clSetKernelArg</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_INVALID_MEM_OBJECT</span> for an argument declared to |
| be a memory object when the |
| specified <code class="varname">arg_value</code> is not a valid memory object. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_MEM_OBJECT</span> for an argument |
| declared to be a multi-sample image, multisample image array, |
| multi-sample depth image or a multi-sample depth image array and the |
| argument value specified in <code class="varname">arg_value</code> does not follow |
| the rules described above for a depth |
| memory object or memory array object argument. (Applies if the |
| <a class="citerefentry" href="cl_khr_gl_msaa_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_gl_msaa_sharing</span></span></a> |
| extension is supported.) |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_SAMPLER</span> for an argument declared to be of type |
| <code class="varname">sampler_t</code> when the specified <code class="varname">arg_value</code> |
| is not a valid sampler object. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_DEVICE_QUEUE</span> for an argument declared to be of |
| type <span class="type">queue_t</span> when the |
| specified <code class="varname">arg_value</code> is not a valid device queue object. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_ARG_SIZE</span> if <code class="varname">arg_size</code> |
| does not match the size of the data type for an argument that |
| is not a memory object or if the argument is a memory object and |
| <code class="varname">arg_size</code> != <code class="code">sizeof(cl_mem)</code> or if |
| <code class="varname">arg_size</code> is zero and the argument is declared with the |
| <a class="citerefentry" href="local.html"><span class="citerefentry"><span class="refentrytitle">local</span></span></a> |
| qualifier or if the argument is a sampler and <code class="varname">arg_size</code> != |
| <code class="code">sizeof(cl_sampler)</code>. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_ARG_VALUE</span> if the argument is an image declared |
| with the <code class="constant">read_only</code> qualifier and <code class="varname">arg_value</code> |
| refers to an image object created with <code class="varname">cl_mem_flags</code> of |
| <code class="constant">CL_MEM_WRITE</code> or if the image argument is declared with |
| the <code class="constant">write_only</code> qualifier and <code class="varname">arg_value</code> |
| refers to an image object created with <code class="varname">cl_mem_flags</code> of |
| <code class="constant">CL_MEM_READ</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="refsect2"> |
| <a id="example1"></a> |
| <h3> |
| Example |
| </h3> |
| <div class="informaltable"> |
| <table border="0"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td align="left"> |
| kernel void |
| image_filter (int n, int m, |
| constant float *filter_weights, |
| read_only image2d_t src_image, |
| write_only image2d_t dst_image) |
| { |
| ... |
| } |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <p> |
| Argument index values for <code class="constant">image_filter</code> will |
| be 0 for <code class="constant">n</code>, 1 for <code class="constant">m</code>, 2 for |
| <code class="constant">filter_weights</code>, 3 for <code class="constant">src_image</code> and 4 for |
| <code class="constant">dst_image</code>. |
| </p> |
| </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=224" target="OpenCL Spec">OpenCL Specification</a> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="seealso"></a> |
| <h2>Also see</h2> |
| <p> |
| <a class="citerefentry" href="clEnqueueNDRangeKernel.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueNDRangeKernel</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>, |
| <a class="citerefentry" href="clSetKernelArgSVMPointer.html"><span class="citerefentry"><span class="refentrytitle">clSetKernelArgSVMPointer</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. |
| 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 |
| the condition that this copyright notice and permission notice shall be included |
| in all copies or substantial portions of the Materials. |
| </div> |
| </div> |
| </body> |
| </html> |
