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| <title>work_group_barrier</title> |
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| <a xmlns="http://www.w3.org/1999/xhtml" id="work_group_barrier"></a> |
| <h1>work_group_barrier</h1> |
| <p> |
| All work-items in a work-group executing the kernel on a processor must execute this function before any are allowed to continue execution beyond the work_group_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"> |
| work_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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| </div> |
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| <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"> |
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| <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef"> |
| <a class="link" href="scalarDataTypes.html" target="pagedisplay">void</a> |
| <strong class="fsfunc"> |
| work_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> |
| </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="memory_scope.html" target="pagedisplay">memory_scope</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">scope |
| </var><code>)</code></td> |
| </tr> |
| </table> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="description"></a> |
| <h2>Description</h2> |
| <p> |
| The built-in function <code class="function">barrier</code> |
| has been renamed <code class="function">work_group_barrier</code>. |
| For backward compatibility, <code class="function">barrier</code> is |
| also supported. |
| </p> |
| <p> |
| All work-items in a work-group executing the kernel on a processor must execute |
| this function before any are allowed to continue execution beyond the |
| <code class="function">work_group_barrier</code>. |
| This function must be encountered by all work-items in a work-group executing the kernel. |
| These rules apply to ND-ranges implemented with uniform and non-uniform |
| work-groups. |
| </p> |
| <p> |
| If <code class="function">work_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 <code class="function">work_group_barrier</code>. |
| </p> |
| <p> |
| If <code class="function">work_group_barrier</code> is inside a loop, all work-items must execute the |
| <code class="function">work_group_barrier</code> for each iteration of the loop before any are allowed |
| to continue execution beyond the <code class="function">work_group_barrier</code>. |
| </p> |
| <p> |
| The <code class="function">work_group_barrier</code> function also supports a |
| variant that specifies the memory scope. For the |
| <code class="function">work_group_barrier</code> variant that does not take a |
| memory scope, the <code class="varname">scope</code> is |
| <code class="code">memory_scope_work_group</code>. |
| </p> |
| <p> |
| The <code class="varname">scope</code> argument specifies whether the memory |
| accesses of work-items in the work-group to |
| memory address space(s) identified by <code class="varname">flags</code> become |
| visible to all work-items in the work-group, the |
| device or all SVM devices. |
| </p> |
| <p> |
| The <code class="function">work_group_barrier</code> function can also be used |
| to specify which memory operations i.e. to global |
| memory, local memory or images become visible to |
| the appropriate memory scope identified by <code class="varname">scope</code>. |
| The <code class="varname">flags</code> argument specifies the memory address |
| spaces and can be set to 0 or a |
| combination of the following values ORed together. |
| When these flags are OR’ed together the |
| <code class="function">work_group_barrier</code> acts as a combined barrier for |
| all address spaces specified by the flags ordering |
| memory accesses both within and across the |
| specified address spaces. |
| </p> |
| <p> |
| <code class="constant">CLK_LOCAL_MEM_FENCE</code> - The |
| <code class="function">work_group_barrier</code> function will ensure that all |
| local memory accesses become visible to all |
| workitems in the work-group. Note that the value of |
| <code class="varname">scope</code> is ignored as the memory scope is always |
| <code class="code">memory_scope_work_group</code>. |
| </p> |
| <p> |
| <code class="constant">CLK_GLOBAL_MEM_FENCE</code> – The |
| <code class="function">work_group_barrier</code> function ensure that all global |
| memory accesses become visible to the appropriate |
| scope as given by <code class="varname">scope</code>. |
| </p> |
| <p> |
| <code class="constant">CLK_IMAGE_MEM_FENCE</code> – The |
| <code class="function">work_group_barrier</code> function will ensure that all |
| image memory accesses become visible to the |
| appropriate scope as given by <code class="varname">scope</code>. The value of |
| <code class="varname">scope</code> must be <code class="constant">memory_scope_work_group</code> or |
| <code class="constant">memory_scope_device</code>. |
| </p> |
| <p> |
| The values of <code class="varname">flags</code> and |
| <code class="varname">scope</code> must be the same for |
| all work-items in the work-group. |
| </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-openclc.pdf#page=97" 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 |
| permit persons to whom the Materials are furnished to do so, subject to |
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