Signals from ethernet card driver

Signals from ethernet card driver

[askeya]

I am not sure if this is a Solaris or an Ada question so I'll post to
both places.

I am trying to get a driver to signal my Ada program when a TCP/IP
message arrives over an ethernet on a Sun running Solaris 2.7.  It would
be great if the signal would act as a task rendezvous.  I have done this
on a VAX with VMS using Starlet, but don't have a clue if it can be done
on a Sun with Solaris.

First question: can the driver send a signal when a message arrives?

Second question:  In theory, can I receive that signal in my program?

Third question (if you feel ambitious): In general, how?

Thanx.
-- 
---------------------------------------------------
|                 Andy Askey                      |
|              Software Engineer                  |
|           Raytheon Systems Company              |
|   670 Discovery Drive, Huntsville, AL  35806    |
|   Phone: (256) 971-2367  Fax: (256) 971-2306    |
|        andrew_j_askey@res.raytheon.com          |
---------------------------------------------------

Re: Signals from ethernet card driver

[dennison]

In article <3728E864.C1BAB081@res.raytheon.com>,
  askeya <askeya@res.raytheon.com> wrote:

> I am trying to get a driver to signal my Ada program when a TCP/IP
> message arrives over an ethernet on a Sun running Solaris 2.7.  It would
> be great if the signal would act as a task rendezvous.  I have done this
> on a VAX with VMS using Starlet, but don't have a clue if it can be done
> on a Sun with Solaris.

> Second question:  In theory, can I receive that signal in my program?
>
> Third question (if you feel ambitious): In general, how?

Before these 2 questions can be answered, you'll have to answer one of ours:
What Ada compiler are you using?

--
T.E.D.

-----------== Posted via Deja News, The Discussion Network ==----------
http://www.dejanews.com/       Search, Read, Discuss, or Start Your Own    

Re: Signals from ethernet card driver

[Larry Kilgallen]

In article <7gcfho$qqu$1@nnrp1.dejanews.com>, dennison@telepath.com writes:
> In article <3728E864.C1BAB081@res.raytheon.com>,
>   askeya <askeya@res.raytheon.com> wrote:
> 
>> I am trying to get a driver to signal my Ada program when a TCP/IP
>> message arrives over an ethernet on a Sun running Solaris 2.7.  It would
>> be great if the signal would act as a task rendezvous.  I have done this
>> on a VAX with VMS using Starlet, but don't have a clue if it can be done
>> on a Sun with Solaris.
> 
>> Second question:  In theory, can I receive that signal in my program?
>>
>> Third question (if you feel ambitious): In general, how?
> 
> Before these 2 questions can be answered, you'll have to answer one of ours:
> What Ada compiler are you using?

But if there is no answer for some compiler, I would be interested
in hearing the answer for some other compiler, since I don't have a
Sun compiler yet :-).

Larry Kilgallen

Re: Signals from ethernet card driver

[Tarjei Tj�stheim Jensen]

askeya wrote:

> I am not sure if this is a Solaris or an Ada question so I'll post to
> both places.
>
> I am trying to get a driver to signal my Ada program when a TCP/IP
> message arrives over an ethernet on a Sun running Solaris 2.7.  It would
> be great if the signal would act as a task rendezvous.  I have done this
> on a VAX with VMS using Starlet, but don't have a clue if it can be done
> on a Sun with Solaris.
>
> First question: can the driver send a signal when a message arrives?
>
> Second question:  In theory, can I receive that signal in my program?
>
> Third question (if you feel ambitious): In general, how?

Why not use sockets? I suppose forrest (available at various net sites which
carries ada source) would do nicely. I would even assume that your ada
environment/compiler comes with the neccessary definitions to use sockets.


Greetings,

Re: Signals from ethernet card driver

[Matthew Heaney]

askeya <askeya@res.raytheon.com> writes:

> I am trying to get a driver to signal my Ada program when a TCP/IP
> message arrives over an ethernet on a Sun running Solaris 2.7.  It would
> be great if the signal would act as a task rendezvous.  I have done this
> on a VAX with VMS using Starlet, but don't have a clue if it can be done
> on a Sun with Solaris.
> 
> First question: can the driver send a signal when a message arrives?

I'm not very driver-literate, but does the client do the I/O using a
file descriptor?  Won't SIGIO (SIGPOLL) work?

> Second question:  In theory, can I receive that signal in my program?

Try declaring an interrupt handler to catch the signal SIGIO (SIGPOLL).  

> Third question (if you feel ambitious): In general, how?

In Ada95, you declare an interrupt handler as a protected procedure, and
bind it to a signal via pragma Interrupt_Handler.

Although it's officially obsolescent, you can also bind an interrupt
handler to a task entry.

Re: Signals from ethernet card driver

[askeya]

I am using the latest version of Rational Apex and the compiler that
comes with.

askeya wrote:
> 
> I am not sure if this is a Solaris or an Ada question so I'll post to
> both places.
> 
> I am trying to get a driver to signal my Ada program when a TCP/IP
> message arrives over an ethernet on a Sun running Solaris 2.7.  It would
> be great if the signal would act as a task rendezvous.  I have done this
> on a VAX with VMS using Starlet, but don't have a clue if it can be done
> on a Sun with Solaris.
> 
> First question: can the driver send a signal when a message arrives?
> 
> Second question:  In theory, can I receive that signal in my program?
> 
> Third question (if you feel ambitious): In general, how?
> 
> Thanx.

-- 
---------------------------------------------------
|                 Andy Askey                      |
|              Software Engineer                  |
|           Raytheon Systems Company              |
|   670 Discovery Drive, Huntsville, AL  35806    |
|   Phone: (256) 971-2367  Fax: (256) 971-2306    |
|        andrew_j_askey@res.raytheon.com          |
---------------------------------------------------

Re: Signals from ethernet card driver

[Vincent P. Amiot]

SIGIO can be used on UNIX non-multithreaded systems not to have to resort
to polling... 

But on multi-threaded systems that do map Ada tasks onto threads/LWP your
best bet is to dedicate a thread that would block itself on a READ (a
blocking call actually stops the thread on a semaphore, the semaphore is
'signaled' in the driver itself and the thread released... This alleviate
the need for setting a handler in user code that will in turn (through some
high level Ada interface) signal a semaphore/CV through a system call
etc...

To summarize SIGIO is great but only for non-multithreaded applications, if
you need more details about out to set it up, get back to me...

Vincent Amiot
Principal Consultant /  Aonix
Tel: (619) 253 1836
-- 
  

Matthew Heaney <matthew_heaney@acm.org> wrote in article
<m3yajar74r.fsf@mheaney.ni.net>...
> askeya <askeya@res.raytheon.com> writes:
> 
> > I am trying to get a driver to signal my Ada program when a TCP/IP
> > message arrives over an ethernet on a Sun running Solaris 2.7.  It
would
> > be great if the signal would act as a task rendezvous.  I have done
this
> > on a VAX with VMS using Starlet, but don't have a clue if it can be
done
> > on a Sun with Solaris.
> > 
> > First question: can the driver send a signal when a message arrives?
> 
> I'm not very driver-literate, but does the client do the I/O using a
> file descriptor?  Won't SIGIO (SIGPOLL) work?
> 
> > Second question:  In theory, can I receive that signal in my program?
> 
> Try declaring an interrupt handler to catch the signal SIGIO (SIGPOLL).  
> 
> > Third question (if you feel ambitious): In general, how?
> 
> In Ada95, you declare an interrupt handler as a protected procedure, and
> bind it to a signal via pragma Interrupt_Handler.
> 
> Although it's officially obsolescent, you can also bind an interrupt
> handler to a task entry.
> 
> 
> 
> 
> 
> 
begin 600 Vincent P. Amiot.vcf
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E;VT-"E)%5CHQ.3DY,#4P,U0R,S0S-3!:#0I%3D0Z5D-!4D0-"D!A
`
end

Re: Signals from ethernet card driver

[askeya]

Thanx for all the input.  These ideas have really helped out design
process.

---------------------------------------------------
|                 Andy Askey                      |
|              Software Engineer                  |
|           Raytheon Systems Company              |
|   670 Discovery Drive, Huntsville, AL  35806    |
|   Phone: (256) 971-2367  Fax: (256) 971-2306    |
|        andrew_j_askey@res.raytheon.com          |
---------------------------------------------------

Re: Signals from ethernet card driver

[Vincent Amiot]

askeya wrote:

> I am not sure if this is a Solaris or an Ada question so I'll post to
> both places.
>
> I am trying to get a driver to signal my Ada program when a TCP/IP
> message arrives over an ethernet on a Sun running Solaris 2.7.  It would
> be great if the signal would act as a task rendezvous.  I have done this
> on a VAX with VMS using Starlet, but don't have a clue if it can be done
> on a Sun with Solaris.
>
> First question: can the driver send a signal when a message arrives?

On non multithreaded systems SIGIO can generally be generated by an
activity on the socket

>
>
> Second question:  In theory, can I receive that signal in my program?
>

See Attach_Handler / Interrupt_Handler pragmas/subprograms

>
> Third question (if you feel ambitious): In general, how?
>

as usual: with care & determination!

>
> Thanx.
> --
> ---------------------------------------------------
> |                 Andy Askey                      |
> |              Software Engineer                  |
> |           Raytheon Systems Company              |
> |   670 Discovery Drive, Huntsville, AL  35806    |
> |   Phone: (256) 971-2367  Fax: (256) 971-2306    |
> |        andrew_j_askey@res.raytheon.com          |
> ---------------------------------------------------