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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: is there a version of unix written in Ada
Date: Thu, 1 Oct 2020 12:21:46 +0200
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On 01/10/2020 11:59, J-P. Rosen wrote:
> Le 01/10/2020 à 11:28, Dmitry A. Kazakov a écrit :
>> BTW, I still do not know to design an Ada-conform tracing/logging
>> facility such that you could trace/log from anywhere, protected action
>> included, and without knowing statically which protected object is
>> involved.
>>
> Did you have a look at package Debug?
> (https://www.adalog.fr/en/components#Debug)

Thanks

> It features, among others, a trace routine which is guaranteed to not be
> potentially blocking.

It calls a protected operation on a different protected object, yes, 
this is non-blocking, and I considered same, but is this legal? Maybe I 
am wrong, but I have an impression that walking away to another object 
is not OK. Or is that limited to protected entries only?

Another issue is having two different calls: Trace and protected Trace. 
If one used instead of another, you have a ticking bomb in the 
production code. I remember that there was a GNAT pragma to catch it, 
but it was a run-time check, so it just replaced one type of explosive 
with another.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de