<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:Gulim;
panose-1:2 11 6 0 0 1 1 1 1 1;}
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:"Malgun Gothic";
panose-1:2 11 5 3 2 0 0 2 0 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:"Malgun Gothic";}
@font-face
{font-family:Gulim;
panose-1:2 11 6 0 0 1 1 1 1 1;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
text-align:justify;
text-justify:inter-ideograph;
text-autospace:none;
word-break:break-hangul;
font-size:10.0pt;
font-family:"Malgun Gothic";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#954F72;
text-decoration:underline;}
p.MsoListParagraph, li.MsoListParagraph, div.MsoListParagraph
{mso-style-priority:34;
margin-top:0cm;
margin-right:0cm;
margin-bottom:0cm;
margin-left:40.0pt;
margin-bottom:.0001pt;
mso-para-margin-top:0cm;
mso-para-margin-right:0cm;
mso-para-margin-bottom:0cm;
mso-para-margin-left:4.0gd;
mso-para-margin-bottom:.0001pt;
text-align:justify;
text-justify:inter-ideograph;
text-autospace:none;
word-break:break-hangul;
font-size:10.0pt;
font-family:"Malgun Gothic";}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Malgun Gothic";}
/* Page Definitions */
@page WordSection1
{size:612.0pt 792.0pt;
margin:3.0cm 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=KO link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Dear Sir,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>I am testing RTEMS POSIX thread priority.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>I am still using RTEMS 4.12 in 2017 year.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>There are four pthreads(main, pthread1, pthread2, pthread3) on two cores in my test case.<o:p></o:p></span></p><p class=MsoNormal style='margin-left:10.0pt;mso-para-margin-left:1.0gd'><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>- main pthread is running on core 1.<o:p></o:p></span></p><p class=MsoNormal style='margin-left:10.0pt;mso-para-margin-left:1.0gd'><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>- pthread1, pthread2, pthread3 is running on core 2.<o:p></o:p></span></p><p class=MsoNormal style='margin-left:10.0pt;mso-para-margin-left:1.0gd'><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>- All threads are doing GPIO toggling action in while(1) loop.<o:p></o:p></span></p><p class=MsoNormal style='margin-left:10.0pt;mso-para-margin-left:1.0gd'><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>- my configuration for timeslice quantum is 25ms.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>As I know from RTEMS POSIX manual, there is below statement.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>In the RTEMS implementation of the POSIX API, the priorities range from the low priority of<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>sched_get_priority_min() to the highest priority of sched_get_priority_max(). Numerically<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>higher values represent higher priorities.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>But, when I test this, lower value is doing as higher priority. Higher value is doing as lower priority.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Is this correct operation ?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Case 0) All threads are same priority.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>[/] # pthread<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>ID NAME CPU SHED PRI STATE MODES EVENTS WAITINFO<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>------------------------------------------------------------------------------<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>0b010001 main_thread 1 MEDF 2147483645 READY P:T:nA NONE <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>0b010002 pthread1 2 MEDF 2147483645 READY P:T:nA NONE <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>0b010003 pthread2 2 MEDF 2147483645 READY P:T:nA NONE <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>0b010004 pthread3 2 MEDF 2147483645 READY P:T:nA NONE<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><img width=655 height=175 style='width:6.8229in;height:1.8229in' id="_xadf8__xb9bc__x0020_1" src="cid:image001.png@01D49EC3.F47AB200"></span><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Case 1) pthread3 is lower priority according to manual. But, pthread3 is higher priority in my case.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>[/] # pthread<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>ID NAME CPU SHED PRI STATE MODES EVENTS WAITINFO<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>------------------------------------------------------------------------------<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>0b010001 main_thread 1 MEDF 2147483645 READY P:T:nA NONE <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>0b010002 pthread1 2 MEDF 2147483646 READY P:T:nA NONE <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>0b010003 pthread2 2 MEDF 2147483646 READY P:T:nA NONE <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>0b010004 pthread3 2 MEDF 1789569706 READY P:T:nA NONE<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><img width=582 height=171 style='width:6.0625in;height:1.7812in' id="_xadf8__xb9bc__x0020_2" src="cid:image002.png@01D49EC4.5D1D58D0"></span><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Case 2) pthread3 is higher priority according to manual. pthread1 and pthread2 are higher priority than pthread3.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>[/] # pthread<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>ID NAME CPU SHED PRI STATE MODES EVENTS WAITINFO<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>------------------------------------------------------------------------------<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>0b010001 main_thread 1 MEDF 2147483645 READY P:T:nA NONE <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>0b010002 pthread1 2 MEDF 1789569706 READY P:T:nA NONE <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>0b010003 pthread2 2 MEDF 1789569706 READY P:T:nA NONE <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>0b010004 pthread3 2 MEDF 2147483646 READY P:T:nA NONE<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><img width=719 height=175 style='width:7.4895in;height:1.8229in' id="_xadf8__xb9bc__x0020_3" src="cid:image003.png@01D49EC4.5D1D58D0"></span><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Please advise.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri",sans-serif'>B</span><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri",sans-serif'>est Regards,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri",sans-serif'>JunBeom Kim<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri",sans-serif'>~~~~~~~~~~~~~~~~~~~~~~<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri",sans-serif'>President / EmbedCoreTech<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Phone: +82-31-396-5584<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Fax: +82-504-065-5720<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Mobile:+82-10-6425-5720<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Email: <a href="mailto:jbkim@e-coretech.kr"><span style='color:blue'>jbkim@e-coretech.kr</span></a> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Web: <a href="http://www.e-coretech.kr"><span style='color:blue'>www.e-coretech.kr</span></a> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:11.0pt;font-family:"Calibri",sans-serif'>~~~~~~~~~~~~~~~~~~~~~~</span><span lang=EN-US style='font-size:11.0pt'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt'><o:p> </o:p></span></p></div></body></html>