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| <div class="section"> |
| <div class="titlepage"><div><div><h2 class="title" style="clear: both"> |
| <a name="chrono.appendices"></a><a class="link" href="appendices.html" title="Appendices">Appendices</a> |
| </h2></div></div></div> |
| <div class="toc"><dl> |
| <dt><span class="section"><a href="appendices.html#chrono.appendices.history">Appendix A: History</a></span></dt> |
| <dt><span class="section"><a href="appendices.html#chrono.appendices.rationale">Appendix B: Rationale</a></span></dt> |
| <dt><span class="section"><a href="appendices.html#chrono.appendices.implementation">Appendix C: Implementation |
| Notes</a></span></dt> |
| <dt><span class="section"><a href="appendices.html#chrono.appendices.faq">Appendix D: FAQ</a></span></dt> |
| <dt><span class="section"><a href="appendices.html#chrono.appendices.acknowledgements">Appendix E: Acknowledgements</a></span></dt> |
| <dt><span class="section"><a href="appendices.html#chrono.appendices.todo">Appendix F: Future plans</a></span></dt> |
| </dl></div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="chrono.appendices.history"></a><a class="link" href="appendices.html#chrono.appendices.history" title="Appendix A: History">Appendix A: History</a> |
| </h3></div></div></div> |
| <div class="toc"><dl> |
| <dt><span class="section"><a href="appendices.html#chrono.appendices.history.__version_1_1_0__mars_17__2011__"><span class="bold"><strong>Version 1.1.0, Mars 17, 2011</strong></span> </a></span></dt> |
| <dt><span class="section"><a href="appendices.html#chrono.appendices.history.__version_1_0_0__january_6__2011__"><span class="bold"><strong>Version 1.0.0, January 6, 2011</strong></span> </a></span></dt> |
| </dl></div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="chrono.appendices.history.__version_1_1_0__mars_17__2011__"></a><a class="link" href="appendices.html#chrono.appendices.history.__version_1_1_0__mars_17__2011__" title="Version 1.1.0, Mars 17, 2011"><span class="bold"><strong>Version 1.1.0, Mars 17, 2011</strong></span> </a> |
| </h4></div></div></div> |
| <p> |
| <span class="bold"><strong>New Features:</strong></span> |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| <a href="http://svn.boost.org/trac/boost/ticket/????" target="_top">#????</a> |
| Added time_point unary operators +,-,++,-- and binary operators +<code class="literal">,-</code> |
| with Rep al RHS. |
| </li> |
| <li class="listitem"> |
| <a href="http://svn.boost.org/trac/boost/ticket/5323" target="_top">#5323</a> |
| Add Associated type difference_type for chrono::time_point. |
| </li> |
| </ul></div> |
| <p> |
| <span class="bold"><strong>Fixes:</strong></span> |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"> |
| <a href="http://svn.boost.org/trac/boost/ticket/5322" target="_top">#5322</a> |
| Explicit default constructed chrono::durations are uninitialized |
| </li></ul></div> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="chrono.appendices.history.__version_1_0_0__january_6__2011__"></a><a class="link" href="appendices.html#chrono.appendices.history.__version_1_0_0__january_6__2011__" title="Version 1.0.0, January 6, 2011"><span class="bold"><strong>Version 1.0.0, January 6, 2011</strong></span> </a> |
| </h4></div></div></div> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| Moved chrono to trunk taking in account the review remarks. |
| </li> |
| <li class="listitem"> |
| Documentation revision. |
| </li> |
| </ul></div> |
| <p> |
| <span class="bold"><strong>Features:</strong></span> |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| Boost_Chrono is now a configurable header-only library version (that |
| also allows the user to choose if the <code class="computeroutput"><span class="identifier">windows</span><span class="special">.</span><span class="identifier">h</span></code> |
| file is included or not). |
| </li> |
| <li class="listitem"> |
| Added clock_string<> traits. |
| </li> |
| <li class="listitem"> |
| Define chrono-io for all the clocks. |
| </li> |
| <li class="listitem"> |
| Add input of process_times representation. |
| </li> |
| </ul></div> |
| <p> |
| <span class="bold"><strong>Implementation:</strong></span> |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| Use of detail/win files to avoid the use of windows.h file. |
| </li> |
| <li class="listitem"> |
| Completed the error_code handling. |
| </li> |
| <li class="listitem"> |
| Works now with BOOST_SYSTEM_NO_DEPRECATED. |
| </li> |
| </ul></div> |
| <p> |
| <span class="bold"><strong>Fixes:</strong></span> |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| Fix some warnings. |
| </li> |
| <li class="listitem"> |
| Fix original errors on Mac |
| </li> |
| <li class="listitem"> |
| Don't fix the link with boost_system to static. |
| </li> |
| </ul></div> |
| <p> |
| <span class="bold"><strong>Test:</strong></span> |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| Added test on process and thread clocks. |
| </li> |
| <li class="listitem"> |
| Moved to lightweight_test.hpp. |
| </li> |
| <li class="listitem"> |
| Able to test multiple configurations. |
| </li> |
| </ul></div> |
| <p> |
| <span class="bold"><strong>Doc:</strong></span> |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"> |
| Removed some not useful parts as the test and the tickets. |
| </li></ul></div> |
| </div> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="chrono.appendices.rationale"></a><a class="link" href="appendices.html#chrono.appendices.rationale" title="Appendix B: Rationale">Appendix B: Rationale</a> |
| </h3></div></div></div> |
| <p> |
| See <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2661.htm" target="_top"><span class="bold"><strong>N2661 - A Foundation to Sleep On</strong></span></a> which is |
| very informative and provides motivation for key design decisions. This section |
| contains some extracts from this document. |
| </p> |
| <a name="chrono.appendices.rationale.why_duration_needs_operator_"></a><h5> |
| <a name="chrono.appendices.rationale.why_duration_needs_operator_-heading"></a> |
| <a class="link" href="appendices.html#chrono.appendices.rationale.why_duration_needs_operator_">Why |
| duration needs operator%</a> |
| </h5> |
| <p> |
| This operator is convenient for computing where in a time frame a given duration |
| lies. A motivating example is converting a duration into a "broken-down" |
| time duration such as hours::minutes::seconds: |
| </p> |
| <pre class="programlisting"><span class="keyword">class</span> <span class="identifier">ClockTime</span> |
| <span class="special">{</span> |
| <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">hours</span> <span class="identifier">hours</span><span class="special">;</span> |
| <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">minutes</span> <span class="identifier">minutes</span><span class="special">;</span> |
| <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">seconds</span> <span class="identifier">seconds</span><span class="special">;</span> |
| <span class="keyword">public</span><span class="special">:</span> |
| <span class="identifier">hours</span> <span class="identifier">hours_</span><span class="special">;</span> |
| <span class="identifier">minutes</span> <span class="identifier">minutes_</span><span class="special">;</span> |
| <span class="identifier">seconds</span> <span class="identifier">seconds_</span><span class="special">;</span> |
| |
| <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Period</span><span class="special">></span> |
| <span class="keyword">explicit</span> <span class="identifier">ClockTime</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">duration</span><span class="special"><</span><span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span><span class="special">>&</span> <span class="identifier">d</span><span class="special">)</span> |
| <span class="special">:</span> <span class="identifier">hours_</span> <span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">duration_cast</span><span class="special"><</span><span class="identifier">hours</span><span class="special">></span> <span class="special">(</span><span class="identifier">d</span><span class="special">)),</span> |
| <span class="identifier">minutes_</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">duration_cast</span><span class="special"><</span><span class="identifier">minutes</span><span class="special">>(</span><span class="identifier">d</span> <span class="special">%</span> <span class="identifier">hours</span><span class="special">(</span><span class="number">1</span><span class="special">))),</span> |
| <span class="identifier">seconds_</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">duration_cast</span><span class="special"><</span><span class="identifier">seconds</span><span class="special">>(</span><span class="identifier">d</span> <span class="special">%</span> <span class="identifier">minutes</span><span class="special">(</span><span class="number">1</span><span class="special">)))</span> |
| <span class="special">{}</span> |
| <span class="special">};</span> |
| </pre> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="chrono.appendices.implementation"></a><a class="link" href="appendices.html#chrono.appendices.implementation" title="Appendix C: Implementation Notes">Appendix C: Implementation |
| Notes</a> |
| </h3></div></div></div> |
| <a name="chrono.appendices.implementation.which_apis_have_been_chosen_to_implement_each_clock_on_each_platform_"></a><h5> |
| <a name="chrono.appendices.implementation.which_apis_have_been_chosen_to_implement_each_clock_on_each_platform_-heading"></a> |
| <a class="link" href="appendices.html#chrono.appendices.implementation.which_apis_have_been_chosen_to_implement_each_clock_on_each_platform_">Which |
| APIs have been chosen to implement each clock on each platform?</a> |
| </h5> |
| <p> |
| The following table presents a resume of which API is uused for each clock |
| on each platform |
| </p> |
| <div class="table"> |
| <a name="chrono.appendices.implementation.clock_api_correspondence"></a><p class="title"><b>Table 4.2. Clock API correspondence</b></p> |
| <div class="table-contents"><table class="table" summary="Clock API correspondence"> |
| <colgroup> |
| <col> |
| <col> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Clock |
| </p> |
| </th> |
| <th> |
| <p> |
| Windows Platform |
| </p> |
| </th> |
| <th> |
| <p> |
| Posix Platform |
| </p> |
| </th> |
| <th> |
| <p> |
| Mac Platform |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <p> |
| <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.system_clock" title="Class system_clock"><code class="computeroutput"><span class="identifier">system_clock</span></code></a> |
| </p> |
| </td> |
| <td> |
| <p> |
| GetSystemTimeAsFileTime |
| </p> |
| </td> |
| <td> |
| <p> |
| clock_gettime( CLOCK_REALTIME) |
| </p> |
| </td> |
| <td> |
| <p> |
| gettimeofday |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <a class="link" href="reference.html#chrono.reference.cpp0x.system_clocks_hpp.steady_clock" title="Class steady_clock"><code class="computeroutput"><span class="identifier">steady_clock</span></code></a> |
| </p> |
| </td> |
| <td> |
| <p> |
| QueryPerformanceCounter and QueryPerformanceFrequency |
| </p> |
| </td> |
| <td> |
| <p> |
| clock_gettime( CLOCK_STEADY) |
| </p> |
| </td> |
| <td> |
| <p> |
| mach_timebase_info,mach_absolute_time |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_real_cpu_clock" title="Class process_real_cpu_clock"><code class="computeroutput"><span class="identifier">process_real_cpu_clock</span></code></a> |
| </p> |
| </td> |
| <td> |
| <p> |
| GetProcessTimes |
| </p> |
| </td> |
| <td> |
| <p> |
| times |
| </p> |
| </td> |
| <td> |
| <p> |
| times |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_system_cpu_clock" title="Class process_system_cpu_clock"><code class="computeroutput"><span class="identifier">process_system_cpu_clock</span></code></a> |
| </p> |
| </td> |
| <td> |
| <p> |
| GetProcessTimes |
| </p> |
| </td> |
| <td> |
| <p> |
| times |
| </p> |
| </td> |
| <td> |
| <p> |
| times |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_user_cpu_clock" title="Class process_user_cpu_clock"><code class="computeroutput"><span class="identifier">process_user_cpu_clock</span></code></a> |
| </p> |
| </td> |
| <td> |
| <p> |
| GetProcessTimes |
| </p> |
| </td> |
| <td> |
| <p> |
| times |
| </p> |
| </td> |
| <td> |
| <p> |
| times |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <a class="link" href="reference.html#chrono.reference.other_clocks.process_cpu_clocks_hpp.process_cpu_clock" title="Class process_cpu_clock"><code class="computeroutput"><span class="identifier">process_cpu_clock</span></code></a> |
| </p> |
| </td> |
| <td> |
| <p> |
| GetProcessTimes |
| </p> |
| </td> |
| <td> |
| <p> |
| times |
| </p> |
| </td> |
| <td> |
| <p> |
| times |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <a class="link" href="reference.html#chrono.reference.other_clocks.thread_clock_hpp.thread_clock" title="Class thread_clock"><code class="computeroutput"><span class="identifier">thread_clock</span></code></a> |
| </p> |
| </td> |
| <td> |
| <p> |
| GetThreadTimes |
| </p> |
| </td> |
| <td> |
| <p> |
| clock_gettime(pthread_getcpuclockid) |
| </p> |
| </td> |
| <td> |
| <p> |
| clock_gettime(pthread_getcpuclockid) |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <br class="table-break"> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="chrono.appendices.faq"></a><a class="link" href="appendices.html#chrono.appendices.faq" title="Appendix D: FAQ">Appendix D: FAQ</a> |
| </h3></div></div></div> |
| <a name="chrono.appendices.faq.why_does_process_cpu_clock_sometimes_give_more_cpu_seconds_than_real_seconds_"></a><h5> |
| <a name="chrono.appendices.faq.why_does_process_cpu_clock_sometimes_give_more_cpu_seconds_than_real_seconds_-heading"></a> |
| <a class="link" href="appendices.html#chrono.appendices.faq.why_does_process_cpu_clock_sometimes_give_more_cpu_seconds_than_real_seconds_">Why |
| does process_cpu_clock sometimes give more cpu seconds than real seconds?</a> |
| </h5> |
| <p> |
| Ask your operating system supplier. The results have been inspected with |
| a debugger, and both for Windows and Linux, that's what the OS appears to |
| be reporting at times. |
| </p> |
| <a name="chrono.appendices.faq.are_integer_overflows_in_the_duration_arithmetic_detected_and_reported_"></a><h5> |
| <a name="chrono.appendices.faq.are_integer_overflows_in_the_duration_arithmetic_detected_and_reported_-heading"></a> |
| <a class="link" href="appendices.html#chrono.appendices.faq.are_integer_overflows_in_the_duration_arithmetic_detected_and_reported_">Are |
| integer overflows in the duration arithmetic detected and reported?</a> |
| </h5> |
| <p> |
| <span class="bold"><strong>Boost.Ratio</strong></span> avoids all kind of overflow |
| that could result of arithmetic operation and that can be simplified. The |
| typedefs durations don't detect overflow. You will need a duration representation |
| that handles overflow. |
| </p> |
| <a name="chrono.appendices.faq.which_clocks_should_be_used_to_benchmarking_"></a><h5> |
| <a name="chrono.appendices.faq.which_clocks_should_be_used_to_benchmarking_-heading"></a> |
| <a class="link" href="appendices.html#chrono.appendices.faq.which_clocks_should_be_used_to_benchmarking_">Which |
| clocks should be used to benchmarking?</a> |
| </h5> |
| <p> |
| Each clock has his own features. It depends on what do you need to benchmark. |
| Most of the time, you could be interested in using a thread clock, but if |
| you need to measure code subject to synchronization a process clock would |
| be better. If you have a multi-process application, a system-wide clock could |
| be needed. |
| </p> |
| <a name="chrono.appendices.faq.which_clocks_should_be_used_for_watching_"></a><h5> |
| <a name="chrono.appendices.faq.which_clocks_should_be_used_for_watching_-heading"></a> |
| <a class="link" href="appendices.html#chrono.appendices.faq.which_clocks_should_be_used_for_watching_">Which |
| clocks should be used for watching?</a> |
| </h5> |
| <p> |
| For trace purposes, it is probably best to use a system-wide clock. |
| </p> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="chrono.appendices.acknowledgements"></a><a class="link" href="appendices.html#chrono.appendices.acknowledgements" title="Appendix E: Acknowledgements">Appendix E: Acknowledgements</a> |
| </h3></div></div></div> |
| <p> |
| The library's code was derived from Howard Hinnant's time2_demo prototype. |
| Many thanks to Howard for making his code available under the Boost license. |
| The original code was modified by Beman Dawes to conform to Boost conventions. |
| </p> |
| <p> |
| time2_demo contained this comment: |
| </p> |
| <p> |
| Much thanks to Andrei Alexandrescu, Walter Brown, Peter Dimov, Jeff Garland, |
| Terry Golubiewski, Daniel Krugler, Anthony Williams. |
| </p> |
| <p> |
| The file <boost/chrono_io.hpp> has been adapted from the experimental |
| header <code class="computeroutput"><span class="special"><</span><span class="identifier">chrono_io</span><span class="special">></span></code> from Howard Hinnant. Thanks for all Howard. |
| </p> |
| <p> |
| Howard Hinnant, who is the real author of the library, has provided valuable |
| feedback and suggestions during the development of the library. In particular, |
| The chrono_io_io.hpp source has been adapted from the experimental header |
| <code class="computeroutput"><span class="special"><</span><span class="identifier">chrono_io</span><span class="special">></span></code> from Howard Hinnant. |
| </p> |
| <p> |
| The acceptance review of Boost.Ratio took place between November 5th and |
| 15th 2010. Many thanks to Anthony Williams, the review manager, and to all |
| the reviewers: David Deakins, John Bytheway, Roland Bock and Paul A. Bristow. |
| </p> |
| <p> |
| Thanks to Ronald Bock, Andrew Chinoff, Paul A. Bristow and John Bytheway |
| for his help polishing the documentation. |
| </p> |
| <p> |
| Thanks to Tom Tan for reporting some compiler issues with MSVC V10 beta and |
| MinGW-gcc-4.4.0 and for the many pushing for an homogeneous <code class="computeroutput"><span class="identifier">process_cpu_clock</span></code> clock. |
| </p> |
| <p> |
| Thanks to Ronald Bock for reporting Valgind issues and for the many suggestions |
| he made concerning the documentation. |
| </p> |
| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="chrono.appendices.todo"></a><a class="link" href="appendices.html#chrono.appendices.todo" title="Appendix F: Future plans">Appendix F: Future plans</a> |
| </h3></div></div></div> |
| <a name="chrono.appendices.todo.for_later_releases"></a><h5> |
| <a name="chrono.appendices.todo.for_later_releases-heading"></a> |
| <a class="link" href="appendices.html#chrono.appendices.todo.for_later_releases">For later releases</a> |
| </h5> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"> |
| Add chrono utilities as defined By Howard Hinnant <a href="http://home.roadrunner.com/~hinnant/duration_io/chrono_util.html" target="_top">here</a>. |
| </li></ul></div> |
| </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 © 2008 Howard Hinnant<br>Copyright © 2006, 2008 Beman Dawes<br>Copyright © 2009-2011 Vicente J. Botet |
| Escriba<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> |
| </div></td> |
| </tr></table> |
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