Re: Will (abstract) Ada code improve over time ?

[Kilgallen@eisner.decus.org.nospam (Larry Kilgallen)]

In article <9k03ot$2me$3@news.tpi.pl>, taw@pb220.legnica.sdi.tpnet.pl (Tomasz Wegrzanowski) writes:

> Not true, because C uses hardware/OS threading model, while Ada uses own
> threading model, so unless hardware and OSes will be designed for Ada,
> C code will perform better (C code can change threading model if
> hardware/OS design changes with no problem).

You do not know, without looking under the covers (of the documentation)
what tasking _mechanism_ is being used.  Some Ada compilers use that
of the OS/hardware, while other Ada compilers use a tasking _mechanism_
of their own.  Some offer a choice, but regardless of the _mechanism_
used, the _model_ presented by Ada is the same.  The _model_ is where
your program must conform.  With Ada there is only one.

One possible reason for _not_ using the OS/hardware mechanism is the
performance cost of a context switch.  If your compiler offers such
an option, you can make a choice without much human effort.