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"Team Ada: Ada Programming Language Advocacy (83 & 95)" <[log in to unmask]>
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Peter Amey <[log in to unmask]>
Date:
Tue, 7 Dec 2004 08:24:22 -0000
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Peter Amey <[log in to unmask]>
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> -----Original Message-----
> From: Team Ada: Ada Programming Language Advocacy (83 & 95)
> [mailto:[log in to unmask]]On Behalf Of Joyce L. Tokar
> Sent: 06 December 2004 20:25
> To: [log in to unmask]
> Subject: Re: Question #2
> 
> 
> On Mon, 6 Dec 2004 09:47:22 -0500, David Botton wrote:
> 
> >Ok #2 in our series of questions that will make their way in to the
> >FAQ, articles, etc. (I will be putting together #1 answers soon)
> >
> >Why is it better to have tasking as a language feature than 
> as an API?
> >
> >

There is another advantage, from our rather parochial corner of Ada world: making something part of the language makes it possible to subset and annotate it as part of a language like SPARK.  By doing so we are able to create an environment in which certain properties of a concurrent system, such as freedom from priority inversions, can be statically proved. If the underlying task constructs were not part of the language we would not be able to achieve this rather useful goal.

Even the foundations on which are work is built, the Ravenscar profile, would not be possible if the language's attitude to concurrency was "roll your own threads using operating system primitives".

Peter


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