Re: Libraries written in Ada

["Alex R. Mosteo" <devnull@mailinator.com>]

Thomas Lotze wrote:
> On Mon, 22 Nov 2004 16:58:59 +0100, Martin Krischik wrote:
> 
> 
>>No, Ada packages allow for initialization code to included. Ada itself
>>makes shure all initialisation code is executed - even when several
>>libraries are combined. This happens automaticly when the main procedure
>>is written in Ada.
> 
> 
> Does this mean every package contains its own runtime environment, or does
> every package do some initialization on a common runtime?

At least in the DLL case, each one has its own runtime.

> 
> 
>>When main is written in another language then the standard demands that
>>"some form of initialisation" is provided. In GNAT this is done be:
>>
>>void adainit (void);
>>
>>You can request another name if you like or need.
> 
> 
> This would make it possible to initialize several Ada libraries separately
> in a C main program.
> 
> 
>>The GNAT binder will generate this procedure for you and it will init all
>>libraries involved.
> 
> 
> And this seems to make it necessary, at least if I don't want to expose
> the implementation details of the libraries to the extent that all used
> Ada libraries have to be bound together by GNAT before they can be bound
> to a C main as a whole (or do I get something completely wrong here?).
> 
> That is, if I have libraries libfoo and libbar written in Ada and
> installed in binary form along with appropriate C include files, can I get
> away without using GNAT if I call both adainit_foo() and adainit_bar() in
> the C main? I think it's much better for library users if they don't have
> to do a separate GNAT binding step but can ignore the fact that there's
> Ada behind the scenes except for the initialization calls.
>