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| <title>sub_group_barrier</title> |
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| <a xmlns="http://www.w3.org/1999/xhtml" id="sub_group_barrier"></a> |
| <h1>sub_group_barrier</h1> |
| <p> |
| All work-items in a sub-group executing the kernel on a |
| processor must execute this function before any are |
| allowed to continue execution beyond the subgroup |
| barrier |
| </p> |
| </div> |
| <div class="refsynopsisdiv"> |
| <h2></h2> |
| <div class="funcsynopsis"> |
| <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"> |
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| <td> |
| <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef"> |
| <a class="link" href="scalarDataTypes.html" target="pagedisplay">void</a> |
| <strong class="fsfunc"> |
| sub_group_barrier |
| </strong> |
| (</code> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_mem_fence_flags" target="pagedisplay">cl_mem_fence_flags</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">flags</var><code>)</code></td> |
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| </tr> |
| </table> |
| </div> |
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| <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"> |
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| <td> |
| <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef"> |
| <a class="link" href="scalarDataTypes.html" target="pagedisplay">void</a> |
| <strong class="fsfunc"> |
| sub_group_barrier |
| </strong> |
| (</code> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_mem_fence_flags" target="pagedisplay">cl_mem_fence_flags</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">flags</var>, </td> |
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| <td> </td> |
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| </table> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="description"></a> |
| <h2>Description</h2> |
| <p> |
| All work-items in a sub-group executing the kernel on a |
| processor must execute this function before any are |
| allowed to continue execution beyond the subgroup |
| barrier. This function must be encountered by all |
| workitems in a sub-group executing the kernel. These rules |
| apply to ND-ranges implemented with uniform and |
| nonuniform work-groups. |
| </p> |
| <p> |
| If <code class="function">sub_group_barrier</code> is inside |
| a conditional statement, then all work-items |
| must enter the conditional if any work-item |
| enters the conditional statement and |
| executes the subgroup barrier. |
| </p> |
| <p> |
| If <code class="function">sub_group_barrier</code> is inside a loop, |
| all work-items within the sub-group must execute the |
| <code class="function">sub_group_barrier</code> for each |
| iteration of the loop before any are allowed |
| to continue execution beyond the <code class="function">sub_group_barrier</code>. |
| </p> |
| <p> |
| The <code class="function">sub_group_barrier</code> function |
| also queues a memory fence (reads and writes) |
| to ensure correct ordering of memory operations to local or global memory. |
| </p> |
| <p> |
| The <code class="varname">flags</code> argument specifies |
| the memory address space and can be |
| set to a combination of the following values. |
| </p> |
| <p> |
| <code class="constant">CLK_LOCAL_MEM_FENCE</code> - The |
| <code class="function">sub_group_barrier</code> function |
| will either flush any variables stored in local memory or queue a memory fence to |
| ensure correct ordering of memory operations to local memory. |
| </p> |
| <p> |
| <code class="constant">CLK_GLOBAL_MEM_FENCE</code> - The |
| <code class="function">sub_group_barrier</code> function |
| will queue a memory fence to ensure correct ordering of memory operations to global |
| memory. This can be useful when work-items, for example, write to buffer or image |
| objects and then want to read the updated data from these buffer objects. |
| </p> |
| <p> |
| <code class="constant">CLK_IMAGE_MEM_FENCE</code> - The |
| <code class="function">sub_group_barrier</code> function |
| will queue a memory fence to ensure correct |
| ordering of memory operations to image objects. This |
| can be useful when work-items, for example, write to |
| image objects and then want to read the updated data |
| from these image objects. |
| </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-2.0-extensions.pdf#page=137" target="OpenCL Spec">OpenCL Specification</a> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="seealso"></a> |
| <h2>Also see</h2> |
| <p> |
| <a class="citerefentry" href="cl_khr_subgroups.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_subgroups</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 © 2007-2013 The Khronos Group Inc. |
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