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<title>memory_order</title>
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<a xmlns="http://www.w3.org/1999/xhtml" id="memory_order"></a>
<h1>memory_order</h1>
<p>
Enumeration to identify memory ordering constraints.
</p>
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<div class="refsect2">
<a id="synopsis"></a>
<h3>
</h3>
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memory_order
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<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_order</span> specifies the detailed regular (non-atomic) memory
synchronization operations as defined in section 5.1.2.4 of the C11 specification and may
provide for operation ordering. Its enumeration constants are as follows:
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<code class="code">     <code class="constant">memory_order_relaxed</code><br />
     <code class="constant">memory_order_acquire</code><br />
     <code class="constant">memory_order_release</code><br />
     <code class="constant">memory_order_acq_rel</code><br />
     <code class="constant">memory_order_seq_cst</code></code>
</p>
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<p>
</p>
<p>
The <span class="type">memory_order</span> can be used when performing
atomic operations to global or local memory.
</p>
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<div class="refsect1">
<a id="notes"></a>
<h2>Notes</h2>
</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_order" 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_scope.html"><span class="citerefentry"><span class="refentrytitle">memory_scope</span></span></a>
</p>
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<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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