[Xenomai-help] Best way to identify a Xenomai task

[Xenomai-help] Best way to identify a Xenomai task

[Jean-Olivier Villemure]

Hi,

I'm looking for the best to identify a Xenomai Task.

We are running multiple task inside kernel space and I need to identify
each of these task. Is there a sort of TaskID ? Otherwise I could look
at the address of the thread associated to one task, but is there a
better way?

Thank You!

Re: [Xenomai-help] Best way to identify a Xenomai task

[Gilles Chanteperdrix]

Jean-Olivier Villemure wrote:
 > Hi,
 > 
 > I'm looking for the best to identify a Xenomai Task.
 > 
 > We are running multiple task inside kernel space and I need to identify
 > each of these task. Is there a sort of TaskID ? Otherwise I could look
 > at the address of the thread associated to one task, but is there a
 > better way?

It depends on the skin you are using,
- for posix skin, it is pthread_self()
- for native skin, it is rt_task_self()
- for vxworks skin, it is taskIdSelf()

The task Id of a new task is also returned by the task creation
services:
- pthread_create for the posix skin,
- rt_task_create for the native skin,
- taskSpawn for the vxworks skin.
When using taskInit with the vxworks skin, the task ID is the address of
the tcb passed as first argument.

-- 


					    Gilles Chanteperdrix.

Re: [Xenomai-help] Best way to identify a Xenomai task

[Jean-Olivier Villemure]

Gilles Chanteperdrix wrote:
> The task Id of a new task is also returned by the task creation
> services:
> - rt_task_create for the native skin
>   
Thank you for your answer!

Looking at the API, i see that rt_task_create returns:
- 0 is returned upon success. Otherwise:
- ENOMEM is returned if the system fails to get enough dynamic memory 
from the global real-time heap in order to create or register the task.
- EEXIST is returned if the /name/ is already in use by some registered 
object.
- EPERM is returned if this service was called from an asynchronous context.

So according to this, no TaskId is returned by this function since 0 is 
returned upon success. But according to the EEXIST error, can we 
considerate that the name of the task is unique? So I could simply use 
this information to identify my tasks ?

Thank you again :-)

Jean-Olivier

Re: [Xenomai-help] Best way to identify a Xenomai task

[Gilles Chanteperdrix]

Jean-Olivier Villemure wrote:
 > Gilles Chanteperdrix wrote:
 > > The task Id of a new task is also returned by the task creation
 > > services:
 > > - rt_task_create for the native skin
 > >   
 > Thank you for your answer!
 > 
 > Looking at the API, i see that rt_task_create returns:
 > - 0 is returned upon success. Otherwise:
 > - ENOMEM is returned if the system fails to get enough dynamic memory 
 > from the global real-time heap in order to create or register the task.
 > - EEXIST is returned if the /name/ is already in use by some registered 
 > object.
 > - EPERM is returned if this service was called from an asynchronous context.
 > 
 > So according to this, no TaskId is returned by this function since 0 is 
 > returned upon success. But according to the EEXIST error, can we 
 > considerate that the name of the task is unique? So I could simply use 
 > this information to identify my tasks ?

Sorry, the task Id is not really returned by rt_task_create, the task Id
is the RT_TASK pointer passed as first argument.

-- 


					    Gilles Chanteperdrix.