Re: Termination of tasks waiting on a protected queue

["Randy Brukardt" <randy@rrsoftware.com>]

<sbelmont700@gmail.com> wrote in message 
news:3ab5fcf0-d2a8-4c82-ab51-02b829aebcaa@googlegroups.com...
> It has always seemed strange that Ada doesn't seem to have a way to block 
> on
> multiple entries, in line with posix select() or waitformultipleobjects. 
> I'd be happy
> with even just a function that can wait on an array of suspension objects.

There was such a proposal for Ada 9x. After much discussion, a report was 
commissioned from the three user-implementor teams. All three reported that 
the operation would be much more expensive to implement than it appears on 
the surface. In particular, the people with hard real-time deadlines could 
not use any imaginable implementation of the feature -- which would have 
made it useless to the #1 constituency. The idea was dropped and never has 
been raised since.

I've totally forgotten why that was, but if you (or someone else) could dig 
up the reports, you could find out why it doesn't work in Ada. (I certainly 
have a printed copy in a dusty box somewhere, but I'm not motivated to go 
spelunking for it.)

[I wrote one of those three reports, but I have no idea where the original, 
digital version of our report is. It's definitely not on my current 
computer. If I could have found it, I could have told you the title of our 
report, which might have helped you dig it up.]

                                                Randy.