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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
- Implementations</a>
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- <p>
- Pool allocators are found in many programming languages, and in many variations.
- The beginnings of many implementations may be found in common programming
- literature; some of these are given below. Note that none of these are complete
- implementations of a Pool; most of these leave some aspects of a Pool as
- a user exercise. However, in each case, even though some aspects are missing,
- these examples use the same underlying concept of a Simple Segregated Storage
- described in this document.
- </p>
- <div class="orderedlist"><ol class="orderedlist" type="1">
- <li class="listitem">
- <span class="emphasis"><em>The C++ Programming Language</em></span>, 3rd ed., by Bjarne
- Stroustrup, Section 19.4.2. Missing aspects:
- <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
- <li class="listitem">
- Not portable.
- </li>
- <li class="listitem">
- Cannot handle allocations of arbitrary numbers of objects (this
- was left as an exercise).
- </li>
- <li class="listitem">
- Not thread-safe.
- </li>
- <li class="listitem">
- Suffers from the static initialization problem.
- </li>
- </ul></div>
- </li>
- <li class="listitem">
- <span class="emphasis"><em>MicroC/OS-II: The Real-Time Kernel</em></span>, by Jean J. Labrosse,
- Chapter 7 and Appendix B.04.
- <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
- <li class="listitem">
- An example of the Simple Segregated Storage scheme at work in the
- internals of an actual OS.
- </li>
- <li class="listitem">
- Missing aspects:
- </li>
- <li class="listitem">
- Not portable (though this is OK, since it's part of its own OS).
- </li>
- <li class="listitem">
- Cannot handle allocations of arbitrary numbers of blocks (which
- is also OK, since this feature is not needed).
- </li>
- <li class="listitem">
- Requires non-intuitive user code to create and destroy the Pool.
- </li>
- </ul></div>
- </li>
- <li class="listitem">
- <span class="emphasis"><em>Efficient C++: Performance Programming Techniques</em></span>,
- by Dov Bulka and David Mayhew, Chapters 6 and 7.
- <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
- <li class="listitem">
- This is a good example of iteratively developing a Pool solutio.
- </li>
- <li class="listitem">
- however, their premise (that the system-supplied allocation mechanism
- is hopelessly inefficient) is flawed on every system I've tested
- on.
- </li>
- <li class="listitem">
- Run their timings on your system before you accept their conclusions.
- </li>
- <li class="listitem">
- Missing aspect: Requires non-intuitive user code to create and
- destroy the Pool.
- </li>
- </ul></div>
- </li>
- <li class="listitem">
- <span class="emphasis"><em>Advanced C++: Programming Styles and Idioms</em></span>, by
- James O. Coplien, Section 3.6.
- <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
- <li class="listitem">
- Has examples of both static and dynamic pooling, but missing aspects:
- </li>
- <li class="listitem">
- Not thread-safe.
- </li>
- <li class="listitem">
- The static pooling example is not portable.
- </li>
- </ul></div>
- </li>
- </ol></div>
- </div>
- <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
- <td align="left"></td>
- <td align="right"><div class="copyright-footer">Copyright © 2000-2006 Stephen Cleary<br>Copyright © 2011 Paul A. Bristow<p>
- Distributed under the Boost Software License, Version 1.0. (See accompanying
- 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>)
- </p>
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