On 02/02/2021 16:56, Gedare Bloom wrote:
On Tue, Feb 2, 2021 at 8:42 AM Sebastian Huber
<sebastian.hu...@embedded-brains.de
<mailto:sebastian.hu...@embedded-brains.de>> wrote:
On 02/02/2021 16:37, Gedare Bloom wrote:
> -.. rubric:: NOTES:
> +.. rubric:: CONSTRAINTS:
>
> -This directive is strictly local and does not impact task
scheduling.
>
>
> I may have missed the discussion, but this note is being removed
> without being added elsewhere.
>
> Is it implied that all functions are local and do not impact task
> scheduling, unless otherwise constrained?
No, I replaced the above with below:
>
> +The following constraints apply to this directive:
> +
> +* The directive is implemented by a macro and may be called
from
> within C/C++
> + constant expressions. In addition, a function implementation
> of the
> + directive exists for bindings to other programming languages.
>
I could also add this:
* The directive will not cause the calling task to be preempted.
I think that will help for clarity, perhaps. It is good to know which
rtems_ services can/cannot preempt
Ok, I will try to add at least one context and at least one preemption
constraint to each directive.
From my point of view it was clear that something which "may be
called
from within C/C++ constant expressions" cannot impact task scheduling.
may is not must. If you call it from a non-constant expression it
still will not preempt.
Also, I think it is a bit odd to say "called from within" a constant.
maybe "used from within" is better? You don't actually make a call
when it is constant.
I would keep the "called from within". It is called by the compiler and
not the processor. In C++ you nowadays have a lot of constexpr functions
(or templates).
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