From: Ken Garlington <Kennie.E.Garlington@lmco.com>
Subject: Re: Why Ada is not the Commercial Lang of Choice
Date: 1997/06/18
Date: 1997-06-18T00:00:00+00:00 [thread overview]
Message-ID: <33A83DA9.67E@lmco.com> (raw)
In-Reply-To: 5o5hv9$dcd$1@goanna.cs.rmit.edu.au
Paul Van Bellinghen writes:
>
> Claim:
> It is much easier in C, for example, to output a data word to
> an I/O device that is memory mapped.
>
> Supporting Evidence:
> 1 One need only define a pointer
> 2 and assign it the memory mapped address
> 3 then store the desired data value to the contents of the pointer.
In Ada, something like:
Memory_Mapped_Address : constant := 16#0100040#;
Memory_Mapped_Value : Interfaces.C.unsigned; -- just to keep type
compatibility
for Memory_Mapped_Value'Address use Memory_Mapped_Address;
Memory_Mapped_Value := 16#00344556#;
And the neat thing is, Memory_Mapped_Value will always be mapped to the
area of memory you want! No worries about your pointer being corrupted
--
because there isn't a pointer! Who knows, now that the compiler knows
that the address is fixed, you might even get more efficient code!
>
> Example:
> #define mem_map_addr B0100040
> unsigned int *p;
>
> p = (unsigned int *) mem_map_addr;
>
> *p = 0x00344556;
Claim: The Ada does the same thing, in the same number of lines, and it
does it
more safety, more clearly, and (gasp) possibly more efficiently!
--
LMTAS - The Fighter Enterprise - "Our Brand Means Quality"
Who uses Ada? See http://www.lmasc.lmco.com/f22
For job listings, other info: http://www.lmtas.com or
http://www.lmco.com
next prev parent reply other threads:[~1997-06-18 0:00 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
1997-06-13 0:00 Why Ada is not the Commercial Lang of Choice Paul Van Bellinghen
1997-06-17 0:00 ` Dale Stanbrough
1997-06-17 0:00 ` Robert Munck
1997-06-18 0:00 ` Ken Garlington [this message]
1997-06-19 0:00 ` Ole-Hjalmar Kristensen FOU.TD/DELAB
1997-06-19 0:00 ` Ken Garlington
1997-06-17 0:00 ` Robert Dewar
1997-06-20 0:00 ` nma123
1997-06-24 0:00 ` Adam Beneschan
1997-06-18 0:00 ` Nick Roberts
1997-06-18 0:00 ` Peter Hermann
1997-06-20 0:00 ` Robert Dewar
1997-06-25 0:00 ` Van Snyder
1997-06-26 0:00 ` Robert Dewar
1997-06-30 0:00 ` Ralph Paul
1997-07-02 0:00 ` Joerg Rodemann
1997-07-02 0:00 ` Ralph Paul
1997-07-02 0:00 ` Joerg Rodemann
1997-06-19 0:00 ` Steve Doiel
1997-06-19 0:00 ` Anonymous
1997-07-22 0:00 ` Shmuel (Seymour J.) Metz
-- strict thread matches above, loose matches on Subject: below --
1997-06-18 0:00 Robert I. Eachus
1997-06-18 0:00 ` Dale Stanbrough
1997-06-19 0:00 ` Steve Jones - JON
1997-06-19 0:00 ` Peter Hermann
1997-06-19 0:00 ` Anonymous
1997-07-17 0:00 ` Shmuel (Seymour J.) Metz
1997-06-19 0:00 ` Robert A Duff
1997-06-21 0:00 ` Paul Van Bellinghen
1997-06-20 0:00 ` Robert Dewar
1997-06-23 0:00 ` John G. Volan
1997-07-03 0:00 ` Shmuel (Seymour J.) Metz
1997-07-03 0:00 ` Robert Dewar
1997-07-06 0:00 ` Yasmiin S. Davis
1997-07-06 0:00 ` Robert Dewar
1997-07-07 0:00 ` Shmuel (Seymour J.) Metz
1997-07-04 0:00 ` Paul Van Bellinghen
1997-07-13 0:00 ` Ken Mays
1997-07-13 0:00 ` Robert Munck
1997-07-14 0:00 ` Ken Mays
1997-06-20 0:00 ` Don Harrison
1997-06-20 0:00 ` Donovan Baarda
1997-06-20 0:00 ` Roy Grimm
1997-06-20 0:00 ` Larry Kilgallen
1997-06-20 0:00 ` Nick Leaton
1997-06-23 0:00 ` Don Harrison
1997-06-24 0:00 ` Bertrand Meyer
1997-06-24 0:00 ` Nick Leaton
1997-07-22 0:00 ` Dr. Vladimir Il'ich Fomin
1997-06-23 0:00 ` Joachim Durchholz
1997-06-23 0:00 ` Robert Dewar
1997-06-24 0:00 ` Don Harrison
1997-06-24 0:00 ` Robert Dewar
1997-06-20 0:00 ` Robert Dewar
1997-06-20 0:00 ` Robert Dewar
1997-06-21 0:00 ` Keith Thompson
1997-06-21 0:00 ` Robert Dewar
1997-06-24 0:00 ` Ken Garlington
1997-06-24 0:00 ` Robert Dewar
1997-06-28 0:00 ` Robert I. Eachus
1997-06-28 0:00 ` Robert Dewar
replies disabled
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox