Re: Rational APEX Ada95 w/ X11R6

[Matthew Heaney <matthew_heaney@acm.org>]

On 15 Jun 1999 20:25, dennison@telepath.com wrote:

> In article <929466176.893.35@news.remarQ.com>,
>   "Brian Kelly" <Brian.Kelly@TVL2000.com> wrote:
> > Has anyone programmed using Rational's Ada95 compiler and X11R6?
> >
> > If so, have you come up w/ any concurrency issues/problems?
> >
> > I'm currently looking into the feasability of putting these two
> products
> > together for future products.
> 
> More specifics would help. 

I think he is refering to the fact that in R6, you can run the X main
loop inside its own thread.

How do you do this in Ada95?  In other words, how can you run the X main
loop inside its own Ada task?

Does R6 specify what kind of thread runs the main loop?  I thought it
specified a "Posix thread."  If so, how do you guarantee that an Ada
task maps to a Posix thread?


> For instance, you will need bindings to X.

No.  All the C calls to X/Motif can be done by a thin C layer, called by
a high-level infrastructure written in Ada95.  There's no need for Ada
bindings to the toolkit directly.


> Some very literal (or "thin") bindings are available, as are some
> thicker ones that do nifty things like synchornize access so that the
> calls are task-safe.

Stay away from thick bindings that "synchronize access so that calls are
task-safe."  This doesn't work.  Stay away from thick bindings.  Stay
away from bindings.


> But what's available to you depends on your compiler/OS combination.

This is a restatement of the original question.