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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=PT-BR link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>OK, 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 lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Try to adjust your tasks as the following pseudo-code and see what happens. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Let know if you have more doubts.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'>Global:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> volatile bool quit = false;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'>Task1:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> while(!quit)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> {<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> led_on();<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> rtems_task_wake_after(RTEMS_MILLISECONDS_TO_TICKS(100);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> led_off();<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> rtems_task_wake_after(RTEMS_MILLISECONDS_TO_TICKS(100);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> }<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> printk("task 1 exiting...\n");<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> rtems_task_delete(rtems_task_self());<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'>Task2:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> while(!quit)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> {<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> printf("hello world!\n");<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> rtems_task_wake_after(RTEMS_MILLISECONDS_TO_TICKS(1000);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> }<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> printk("task 2 exiting...\n");<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> rtems_task_delete(rtems_task_self());<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'>Init:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> int i = 0;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> rtems_task_create(Task1);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> rtems_task_create(Task2);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> rtems_task_start(Task1);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> rtems_task_start(Task2);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> while(i < 120) // Let tasks run for aprox 2 minutes.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> {<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> rtems_task_wake_after(RTEMS_MILLISECONDS_TO_TICKS(1000);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> i++;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> }<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> quit = true; // Let the tasks delete themselfs<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> printk("Task init: end of test\n");<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D'> rtems_task_delete(rtems_task_self()); // Say “Addio, mondo crudele.”<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><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'> Luca Cinquepalmi [mailto:cinquepalmi@planetek.it] <br><b>Enviada em:</b> quarta-feira, 19 de setembro de 2012 13:24<br><b>Para:</b> Wendell Pereira da Silva<br><b>Cc:</b> rtems-users@rtems.org<br><b>Assunto:</b> Re: RES: testing multitasking rtems<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>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:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Luca,</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>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).</span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>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.</span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>If you want your tasks sharing the CPU, please, check the tasks priority, attributes and execution mode.</span><o:p></o:p></p><p class=MsoNormal style='margin-left:6.75pt'><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Probably task one has higher priority than task two, and task one never blocks.</span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>A good reference is the <a href="http://www.rtems.org/onlinedocs/releases/rtemsdocs-4.10.2/share/rtems/pdf/c_user.pdf">RTEMS Users Guide</a>, topic 5.2.</span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hope it helps.</span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>--Wendell</span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><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 href="mailto:rtems-users-bounces@rtems.org">rtems-users-bounces@rtems.org</a> [<a 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 href="mailto:rtems-users@rtems.org">rtems-users@rtems.org</a><br><b>Assunto:</b> Re: testing multitasking rtems</span><o:p></o:p></p></div></div><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></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal>On 09/18/2012 06:07 AM, Luca Cinquepalmi wrote: <br><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><br><o:p></o:p></p><p class=MsoNormal>I'm not able to find any suggestion. Thank you <br><br> Luca <br>_______________________________________________ <br>rtems-users mailing list <br><a href="mailto:rtems-users@rtems.org">rtems-users@rtems.org</a> <br><a href="http://www.rtems.org/mailman/listinfo/rtems-users">http://www.rtems.org/mailman/listinfo/rtems-users</a> <o:p></o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'> <o:p></o:p></p></blockquote><p class=MsoNormal> <o:p></o:p></p></blockquote><p class=MsoNormal><o:p> </o:p></p></div></body></html>