<div dir="ltr"><br><div class="gmail_extra"><div class="gmail_quote">2013/4/25 Pavel Pisa <span dir="ltr"><<a href="mailto:ppisa4lists@pikron.com" target="_blank">ppisa4lists@pikron.com</a>></span><br><blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Hello Deng Hengyi,<br>
<div class="im"><br>
On Thursday 25 April 2013 07:27:20 wei.a.yang wrote:<br>
> Hi, Pavel. Thank you for your advice. And in my former mail my proposal is<br>
> very similar with the mechanism in the Linux. But the different is that I<br>
> use two min-heap instead of two plist because of good algorithm complexity<br>
> of min-heap.<br>
<br>
</div>It worth to evaluate what is better algorithm - RB-tree or min-heap.<br>
RB tree allows to use "static" nodes which are part of the task<br>
structure. The classic array base heap tree with 2n and 2n+1 children<br>
requires per queue array allocation and result in the limited/compile<br>
time defined depth or requires reallocations. But may it be you have<br>
other algorithm on mind.<br>
<div class="im"><br></div></blockquote><div>Yeah, now in my opinion the algorithm <span id="result_box" class="" lang="en"><span class="">candidates are RB tree and min-heap.<br></span></span></div><div><span id="result_box" class="" lang="en"><span class="">But just as you said the disadvantage of min-heap is its size allocation. So i will<br>
</span></span></div><div><span id="result_box" class="" lang="en"><span class="">evalutate the two and select a more suitable for RTEMS. If you have any more <br></span></span></div><div><span id="result_box" class="" lang="en"><span class="">better way please comment freely.<br>
<br></span></span> </div><blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="im">
> > I have done some testing of RTEMS and Linux PI implementations.<br>
> > You can find my test code cor RTEMS classic API<br>
> > and POSIX RTEMS and Linux in the repo<br>
><br>
> Good work. But I want to know the mechanism of RTEMS test. You know there<br>
> are two PI algorithms in RTEMS. One is used by default, the other one<br>
> should define __RTEMS_STRICT_ORDER_MUTEX__ to use it. You test two<br>
> algorithms all?<br>
<br>
</div>I have tested default one. The __RTEMS_STRICT_ORDER_MUTEX__ should<br>
behave as expected but there is risk that some code/libray we use<br>
does not access mutexes in the strict LIFO order.<br>
<br>
Best wishes,<br>
<br>
Pavel<br>
</blockquote></div><br><br clear="all"><br>-- <br>Wei Yang<br>Best Regards<br><br>wei.a.yang at <a href="http://gmail.com" target="_blank">gmail.com</a> <br><br>
</div></div>