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<div class="moz-cite-prefix">Wendell, thank you for your answer... I
try to explain better:<br>
- task1 makes a led blinking (in a while cycle)<br>
- task2 print a simple "hello world"<br>
<br>
I want "hello world" to be printed while led is blinking. How can
I share CPU with these two tasks?<br>
Shall I delete task at the end? Shall I define a semaphore? <br>
I tried to modify task priority but it has no effects...<br>
Even if led blinking (task 1) start, task 2 doesn't... <br>
<br>
Hope now it's clearer...<br>
<br>
Luca<br>
<br>
<br>
<br>
Il 19/09/2012 17.18, Wendell Pereira da Silva ha scritto:<br>
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Luca,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">Unless you have two CPUs (or a dual core CPU)
and SMP support for your BSP, it’s impossible to get two
tasks running at the same time (if I understood what you
mean “… a second task running when one is still running).<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">In most cases, on single core (or single
processor) BSP’s tasks share the same CPU being droved by
any scheduling policy implemented in the RTOS.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">If you want your tasks sharing the CPU, please,
check the tasks priority, attributes and execution mode.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:6.75pt"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">Probably task one has higher priority than task
two, and task one never blocks.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">A good reference is the <a
moz-do-not-send="true"
href="http://www.rtems.org/onlinedocs/releases/rtemsdocs-4.10.2/share/rtems/pdf/c_user.pdf">RTEMS
Users Guide</a>, topic 5.2.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">Hope it helps.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">--Wendell<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">De:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">
<a class="moz-txt-link-abbreviated" href="mailto:rtems-users-bounces@rtems.org">rtems-users-bounces@rtems.org</a>
[<a class="moz-txt-link-freetext" href="mailto:rtems-users-bounces@rtems.org">mailto:rtems-users-bounces@rtems.org</a>] <b>Em nome de </b>Luca
Cinquepalmi<br>
<b>Enviada em:</b> quarta-feira, 19 de setembro de 2012
11:16<br>
<b>Para:</b> Joel Sherrill<br>
<b>Cc:</b> <a class="moz-txt-link-abbreviated" href="mailto:rtems-users@rtems.org">rtems-users@rtems.org</a><br>
<b>Assunto:</b> Re: testing multitasking rtems<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">How can I run Two tasks in the same time?
Evey task ends with delete_task so the next task starts<br>
when the previous is finished. How can I make a second task
running when task one is still running?<br>
<br>
Example:<br>
<br>
<span style="font-size:10.0pt">rtems_task
Init(rtems_task_argument ignored)<br>
{<br>
<br>
...<br>
rtems_task_start(task_id1...)<br>
rtems_task_start(task_id2...)<br>
...<br>
}</span><br>
<br>
<br>
I want that task 2 starts while task1 is still running? How
can I do this?<br>
Thank you<br>
<br>
Luca<br>
<br>
<br>
<br>
Il 18/09/2012 13.12, Joel Sherrill ha scritto:<o:p></o:p></p>
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<p class="MsoNormal">On 09/18/2012 06:07 AM, Luca Cinquepalmi
wrote: <br>
<br>
<o:p></o:p></p>
<p class="MsoNormal">Hi all, <br>
is there on line or in rtems documentaion any exmaple (c
source code) of <br>
how testing multitasking? <o:p></o:p></p>
<p class="MsoNormal">Nearly every test is multitasking. All
are if you consider there is <br>
at least an application task/thread and an idle task. <br>
<br>
The most basic tests for a BSP are hello and ticker. Ticker
has <br>
3 user tasks which run at different intervals. <br>
<br>
<o:p></o:p></p>
<p class="MsoNormal">I'm not able to find any suggestion.
Thank you <br>
<br>
Luca <br>
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<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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