Re: Isn't this in favour of Ada??

[Florian Weimer <fw@deneb.enyo.de>]

* Larry Kilgallen:

> In article <8764vcdv2f.fsf@deneb.enyo.de>, Florian Weimer <fw@deneb.enyo.de> writes:
>
>> I also fail to see Ada's advantages because Ada tasking tends to match
>> poorly to concurrency models supported by operating systems.  For
>> example, how can you add a select alternative which waits for activity
>> on a specific file descriptor, without introducing many pointless
>> context switches?
>
> I don't know "file descriptor" as an Ada term, but presuming you mean
> activity on a file, I would use the VMS Lock Manager requesting an AST
> when there is activity (if I were creating an Ada implementation).

But my point was that this has to be done by the implementor.  It is
something that is hard to resolve at a library level (unless you are
willing to take the costs of a few additional context switches, of
course).