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<title>atomic_flag</title>
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<a xmlns="http://www.w3.org/1999/xhtml" id="atomic_flag"></a>
<h1>atomic_flag</h1>
<p>
The atomic_flag type provides the classic test-and-set functionality.
</p>
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<div class="refsect2">
<a id="synopsis"></a>
<h3>
</h3>
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atomic_flag
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<div class="refsect1">
<a id="description"></a>
<h2>Description</h2>
<p>
The <code class="function">atomic_flag</code> type provides the
classic test-and-set functionality. It has two states, set
(value is non-zero) and clear (value is 0). Operations
on an object of type <code class="function">atomic_flag</code> shall
be lock free.
</p>
<p>
The macro <code class="constant">ATOMIC_FLAG_INIT</code> may be
used to initialize an <code class="function">atomic_flag</code> to the clear
state. An <code class="function">atomic_flag</code> that is not
explicitly initialized with <code class="constant">ATOMIC_FLAG_INIT</code> is
initially in an indeterminate state.
</p>
<p>
This macro can only be used for atomic objects that are
declared in program scope in the global
address space with the <code class="function">atomic_flag</code> type.
</p>
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<h3>
Example
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global atomic_flag guard = ATOMIC_FLAG_INIT;
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<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=110" 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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