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<title>Appendix F: Other Implementations</title>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_pool.appendices.implementations"></a><a class="link" href="implementations.html" title="Appendix F: Other Implementations">Appendix F: Other
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Implementations</a>
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</h3></div></div></div>
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<p>
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Pool allocators are found in many programming languages, and in many variations.
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The beginnings of many implementations may be found in common programming
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literature; some of these are given below. Note that none of these are complete
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implementations of a Pool; most of these leave some aspects of a Pool as
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a user exercise. However, in each case, even though some aspects are missing,
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these examples use the same underlying concept of a Simple Segregated Storage
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described in this document.
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</p>
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<div class="orderedlist"><ol class="orderedlist" type="1">
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<li class="listitem">
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<span class="emphasis"><em>The C++ Programming Language</em></span>, 3rd ed., by Bjarne
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Stroustrup, Section 19.4.2. Missing aspects:
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<div class="itemizedlist"><ul class="itemizedlist" type="disc">
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<li class="listitem">
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Not portable.
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</li>
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<li class="listitem">
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Cannot handle allocations of arbitrary numbers of objects (this
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was left as an exercise).
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</li>
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<li class="listitem">
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Not thread-safe.
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</li>
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<li class="listitem">
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Suffers from the static initialization problem.
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</li>
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</ul></div>
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</li>
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<li class="listitem">
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<span class="emphasis"><em>MicroC/OS-II: The Real-Time Kernel</em></span>, by Jean J. Labrosse,
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Chapter 7 and Appendix B.04.
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<div class="itemizedlist"><ul class="itemizedlist" type="disc">
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<li class="listitem">
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An example of the Simple Segregated Storage scheme at work in the
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internals of an actual OS.
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</li>
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<li class="listitem">
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Missing aspects:
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</li>
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<li class="listitem">
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Not portable (though this is OK, since it's part of its own OS).
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</li>
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<li class="listitem">
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Cannot handle allocations of arbitrary numbers of blocks (which
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is also OK, since this feature is not needed).
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</li>
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<li class="listitem">
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Requires non-intuitive user code to create and destroy the Pool.
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</li>
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</ul></div>
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</li>
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<li class="listitem">
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<span class="emphasis"><em>Efficient C++: Performance Programming Techniques</em></span>,
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by Dov Bulka and David Mayhew, Chapters 6 and 7.
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<div class="itemizedlist"><ul class="itemizedlist" type="disc">
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<li class="listitem">
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This is a good example of iteratively developing a Pool solutio.
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</li>
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<li class="listitem">
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however, their premise (that the system-supplied allocation mechanism
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is hopelessly inefficient) is flawed on every system I've tested
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on.
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</li>
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<li class="listitem">
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Run their timings on your system before you accept their conclusions.
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</li>
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<li class="listitem">
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Missing aspect: Requires non-intuitive user code to create and
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destroy the Pool.
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</li>
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</ul></div>
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</li>
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<li class="listitem">
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<span class="emphasis"><em>Advanced C++: Programming Styles and Idioms</em></span>, by
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James O. Coplien, Section 3.6.
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<div class="itemizedlist"><ul class="itemizedlist" type="disc">
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<li class="listitem">
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Has examples of both static and dynamic pooling, but missing aspects:
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</li>
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<li class="listitem">
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Not thread-safe.
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</li>
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<li class="listitem">
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The static pooling example is not portable.
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</li>
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</ul></div>
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</li>
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</ol></div>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2000-2006 Stephen Cleary<br>Copyright © 2011 Paul A. Bristow<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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</p>
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