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<title>Thread Safety</title>
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<div class="titlepage"><div><div><h4 class="title">
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<a name="math_toolkit.quadrature.double_exponential.de_thread"></a><a class="link" href="de_thread.html" title="Thread Safety">Thread
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Safety</a>
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</h4></div></div></div>
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<p>
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All three of the double-exponential integrators are thread safe as long
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as BOOST_MATH_NO_ATOMIC_INT is not set. Since the integrators store a large
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amount of fairly hard to compute data, it is recomended that these objects
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are stored and reused as much as possible.
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</p>
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<p>
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Internally all three of the double-exponential integrators use the same
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caching strategy: they allocate all the vectors needed to store the maximum
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permitted levels, but only populate the first few levels when constructed.
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This means a minimal amount of memory is actually allocated when the integrator
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is first constructed, and already populated levels can be accessed via
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a lockfree atomic read, and only populating new levels requires a thread
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lock.
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</p>
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<p>
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In addition, the three built in types (plus <code class="computeroutput"><span class="identifier">__float128</span></code>
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when available), have the first 7 levels pre-computed: this is generally
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sufficient for the vast majority of integrals - even at quad precision
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- and means that integrators for these types are relatively cheap to construct.
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<td align="right"><div class="copyright-footer">Copyright © 2006-2010, 2012-2014, 2017 Nikhar
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Agrawal, Anton Bikineev, Paul A. Bristow, Marco Guazzone, Christopher Kormanyos,
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Hubert Holin, Bruno Lalande, John Maddock, Jeremy Murphy, Johan Råde, Gautam
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Sewani, Benjamin Sobotta, Nicholas Thompson, Thijs van den Berg, Daryle Walker
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and Xiaogang Zhang<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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