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| <title>atomic_work_item_fence</title> |
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| <div xmlns="" class="refnamediv"> |
| <a xmlns="http://www.w3.org/1999/xhtml" id="atomic_work_item_fence"></a> |
| <h1>atomic_work_item_fence</h1> |
| <p> |
| atomic_work_item_fence functions. |
| </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">atomic_work_item_fence</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_order.html" target="pagedisplay">memory_order</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">order</var>, </td> |
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| <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> |
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| </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">flags</code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| Must be set to <code class="constant">CLK_GLOBAL_MEM_FENCE</code>, |
| <code class="constant">CLK_LOCAL_MEM_FENCE</code>, |
| <code class="constant">CLK_IMAGE_MEM_FENCE</code> or a combination |
| of these values ORed together; otherwise the |
| behavior is undefined. |
| The behavior of calling <code class="function">atomic_work_item_fence</code> with |
| <code class="constant">CLK_IMAGE_MEM_FENCE</code> ORed together with either |
| <code class="constant">CLK_GLOBAL_MEM_FENCE</code> or |
| <code class="constant">CLK_LOCAL_MEM_FENCE</code> is equivalent to calling |
| <code class="function">atomic_work_item_fence</code> individually for |
| <code class="constant">CLK_IMAGE_MEM_FENCE</code> and the other flags. Passing both |
| <code class="constant">CLK_GLOBAL_MEM_FENCE</code> and |
| <code class="constant">CLK_LOCAL_MEM_FENCE</code> to |
| <code class="function">atomic_work_item_fence</code> will synchronize memory |
| operations to both local and global memory through some shared |
| atomic action, as described in section 3.3.6.2 |
| of the OpenCL API specficiation. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname">order</code> |
| </span> |
| </dt> |
| <dd></dd> |
| <dt> |
| <span class="term"> |
| <code class="varname">scope</code> |
| </span> |
| </dt> |
| <dd></dd> |
| </dl> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="description"></a> |
| <h2>Description</h2> |
| <p> |
| Depending on the value of order, this operation: |
| </p> |
| <div class="itemizedlist"> |
| <ul class="itemizedlist" style="list-style-type: disc; "> |
| <li class="listitem"> |
| <p> |
| has no effects, if <code class="varname">order</code> == <code class="constant">memory_order_relaxed</code>. |
| </p> |
| </li> |
| <li class="listitem"> |
| <p> |
| is an acquire fence, if <code class="varname">order</code> == <code class="constant">memory_order_acquire</code>. |
| </p> |
| </li> |
| <li class="listitem"> |
| <p> |
| is a release fence, if <code class="varname">order</code> == <code class="constant">memory_order_release</code>. |
| </p> |
| </li> |
| <li class="listitem"> |
| <p> |
| is both an acquire fence and a release fence, |
| if <code class="varname">order</code> == <code class="constant">memory_order_acq_rel</code>. |
| </p> |
| </li> |
| <li class="listitem"> |
| <p> |
| is a sequentially consistent acquire and release fence, if |
| <code class="varname">order</code> == <code class="constant">memory_order_seq_cst</code>. |
| </p> |
| </li> |
| </ul> |
| </div> |
| <p> |
| For images declared with the <code class="code">read_write</code> qualifier, |
| the <code class="function">atomic_work_item_fence</code> |
| must be called to make sure that writes to the image by a |
| work-item become visible to that workitem on subsequent |
| reads to that image by that work-item. |
| </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=105" target="OpenCL Spec">OpenCL Specification</a> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="seealso"></a> |
| <h2>Also see</h2> |
| <p> |
| <a class="citerefentry" href="atomicFunctions.html"><span class="citerefentry"><span class="refentrytitle">Atomic Functions</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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