Determining resource usage for BSP drivers

Fri Feb 10 13:53:39 UTC 2023

> -----Original Message-----
> From: users <users-bounces at rtems.org> On Behalf Of Sebastian Huber
> Sent: Freitag, 10. Februar 2023 14:23
> To: martinerikwerner.aac at gmail.com; users at rtems.org
> Subject: Re: Determining resource usage for BSP drivers
> 
> On 10.02.23 14:19, martinerikwerner.aac at gmail.com wrote:
> > Some BSP drivers use rtems objects in their implementation, for
> > example GRCAN creating semaphores in bsps/shared/grlib/can/grcan.c.
> >
[...]
> > Or is it assumed that the system will be configured with unlimited
> > resources instead in most cases where this could become an issue?
> 
> Yes, it is quite difficult to do the resource accounting for the Classic API
> objects. We rewrote a lot of drivers to use the self-contained
> synchronization objects:
> 
> https://docs.rtems.org/branches/master/c-user/self_contained_objects.html
> 

Ah, very interesting and well explained.
Can one use it as a general rule of thumb for new applications to prefer those self-contained objects instead of the classic rtems_semaphore_create() objects?
And are there any pitfalls when mixing those two APIs or is it safe to do so?

Best regards,

    Jan

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