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| <title>memory_scope</title> |
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| <a xmlns="http://www.w3.org/1999/xhtml" id="memory_scope"></a> |
| <h1>memory_scope</h1> |
| <p> |
| Identify if memory_scope applies to work-items in a work-group or work-items of a kernel(s). |
| </p> |
| </div> |
| <div class="refsect2"> |
| <a id="synopsis"></a> |
| <h3> |
| </h3> |
| <div class="informaltable"> |
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| memory_scope |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="description"></a> |
| <h2>Description</h2> |
| <p> |
| The OpenCL C programming language implements a subset of the C11 atomics (refer to section |
| 7.17 of the C11 specification) and synchronization operations. These operations play a special |
| role in making assignments in one work-item visible to another. |
| A synchronization operation on |
| one or more memory locations is either an acquire operation, a release operation, or both an |
| acquire and release operation. (The C11 consume operation is not supported.) |
| A synchronization operation without an associated memory |
| location is a fence and can be either an acquire fence, a release fence or both an acquire and |
| release fence. In addition, there are relaxed atomic operations, which are not synchronization |
| operations, and atomic read-modify-write operations which have special characteristics |
| </p> |
| <p> |
| The enumerated type <span class="type">memory_scope</span> specifies |
| whether the memory ordering constraints given by |
| <a class="citerefentry" href="memory_order.html"><span class="citerefentry"><span class="refentrytitle">memory_order</span></span></a> |
| apply to work-items in a work-group or work-items of a kernel(s) |
| executing on the device or across devices (in the case of shared virtual memory). |
| Its enumeration constants are as follows: |
| </p> |
| <p> |
| </p> |
| <div class="literallayout"> |
| <p> |
| <code class="code"> <code class="constant">memory_scope_work_item</code><br /> |
| <code class="constant">memory_scope_work_group</code><br /> |
| <code class="constant">memory_scope_device</code><br /> |
| <code class="constant">memory_scope_all_svm_devices</code><br /> |
| </code> |
| </p> |
| </div> |
| <p> |
| </p> |
| <p> |
| The <code class="constant">memory_scope_work_item</code> value for |
| <span class="type">memory_scope</span> can only be used with |
| <a class="citerefentry" href="atomic_work_item_fence.html"><span class="citerefentry"><span class="refentrytitle">atomic_work_item_fence</span></span></a> |
| with <code class="varname">flags</code> set to |
| <code class="constant">CLK_IMAGE_MEM_FENCE</code>. |
| </p> |
| <p> |
| The memory scope should only be used when performing atomic operations to global memory. |
| Atomic operations to local memory only guarantee memory ordering in the work-group not |
| across work-groups and therefore ignore the <span class="type">memory_scope</span> value. |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="notes"></a> |
| <h2>Notes</h2> |
| <p> |
| </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-openclc.pdf#namedest=memory_scope" 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>, |
| <a class="citerefentry" href="memory_order.html"><span class="citerefentry"><span class="refentrytitle">memory_order</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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