RES: testing multitasking rtems

[Luca Cinquepalmi]

Wendell, thank you for your answer... I try to explain better:
- task1 makes a led blinking (in a while cycle)
- task2 print a simple "hello world"

I want "hello world" to be printed while led is blinking. How can I 
share CPU with these two tasks?
Shall I delete task at the end? Shall I define a semaphore?
I tried to modify task priority but it has no effects...
Even if led blinking (task 1) start, task 2 doesn't...

Hope now it's clearer...

     Luca



Il 19/09/2012 17.18, Wendell Pereira da Silva ha scritto:
>
> Luca,
>
> 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).
>
> 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.
>
> If you want your tasks sharing the CPU, please, check the tasks 
> priority, attributes and execution mode.
>
> Probably task one has higher priority than task two, and task one 
> never blocks.
>
> A good reference is the RTEMS Users Guide 
> <http://www.rtems.org/onlinedocs/releases/rtemsdocs-4.10.2/share/rtems/pdf/c_user.pdf>, 
> topic 5.2.
>
> Hope it helps.
>
> --Wendell
>
> *De:*rtems-users-bounces at rtems.org 
> [mailto:rtems-users-bounces at rtems.org] *Em nome de *Luca Cinquepalmi
> *Enviada em:* quarta-feira, 19 de setembro de 2012 11:16
> *Para:* Joel Sherrill
> *Cc:* rtems-users at rtems.org
> *Assunto:* Re: testing multitasking rtems
>
> How can I run Two tasks in the same time? Evey task ends with 
> delete_task so the next task starts
> when the previous is finished. How can I make a second task running 
> when task one is still running?
>
> Example:
>
> rtems_task Init(rtems_task_argument ignored)
> {
>
>     ...
>     rtems_task_start(task_id1...)
>     rtems_task_start(task_id2...)
>     ...
> }
>
>
> I want that task 2 starts while task1 is still running? How can I do this?
> Thank you
>
>     Luca
>
>
>
> Il 18/09/2012 13.12, Joel Sherrill ha scritto:
>
>     On 09/18/2012 06:07 AM, Luca Cinquepalmi wrote:
>
>     Hi all,
>     is there on line or in rtems documentaion any exmaple (c source
>     code) of
>     how testing multitasking?
>
>     Nearly every test is multitasking. All are if you consider there is
>     at least an application task/thread and an idle task.
>
>     The most basic tests for a BSP are hello and ticker. Ticker has
>     3 user tasks which run at different intervals.
>
>     I'm not able to find any suggestion. Thank you
>
>           Luca
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>

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