From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham
	autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,5618e4c4489899ac
X-Google-Attributes: gid103376,public
X-Google-ArrivalTime: 2002-07-31 06:59:05 PST
Path: 
 archiver1.google.com!news1.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!wn1feed!wn2feed!worldnet.att.net!204.127.198.203!attbi_feed3!attbi_feed4!attbi.com!sccrnsc03.POSTED!not-for-mail
From: "SteveD" <nospam_steved94@attbi.com>
Newsgroups: comp.lang.ada
References: <a5ae824.0207301854.3295f3a2@posting.google.com>
Subject: Re: implementation approach
X-Priority: 3
X-MSMail-Priority: Normal
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000
Message-ID: <I2S19.101867$uh7.16891@sccrnsc03>
NNTP-Posting-Host: 12.225.227.101
X-Complaints-To: abuse@attbi.com
X-Trace: sccrnsc03 1028123944 12.225.227.101 (Wed, 31 Jul 2002 13:59:04 GMT)
NNTP-Posting-Date: Wed, 31 Jul 2002 13:59:04 GMT
Organization: AT&T Broadband
Date: Wed, 31 Jul 2002 13:59:04 GMT
Xref: archiver1.google.com comp.lang.ada:27524
Date: 2002-07-31T13:59:04+00:00
List-Id: <comp.lang.ada>

"Mark" <ma740988@pegasus.cc.ucf.edu> wrote in message
news:a5ae824.0207301854.3295f3a2@posting.google.com...
[snip]
>
> I suspect I'll need two semaphores on both processors.  Once the flag
> gets passed from processor B to processor A, the routine in A will
> enter the semaphore command the device, release the flag, etc.
>
> Thanks in advance

In Ada an interrupt is associated with a protected procedure in a protected
type.  An example of how to set this up is in the LRM C.3.2(28).

I haven't done any Ada Interrupt handling myself, but I believe this is the
way it's done.

With Ada.Interrupts;

Package Body Interrupt_Test Is

  Protected Type Device_Interface(Int_Id : Ada.Interrupts.Interrupt_ID) Is
    Procedure Handler;
    Pragma Attach_Handler( Handler, Int_Id );
    Entry Wait_Interrupt;
  Private
    Occurred : Boolean := False;
  End Device_Interface;

  Protected Body Device_Interface Is
    Procedure Handler Is
    Begin
      Occurred := TRUE;
    End Handler;
    Entry Wait_Interrupt When Occurred Is
    Begin
      Occurred := False;
    End Wait_Interrupt;
  End Device_Interface;

  Device_1_Driver : Device_Interface( 1 );

  Task Relay Is
  End Relay;

  Task Body Relay Is
  Begin
    Loop
      Device_1_Driver.Wait_Interrupt;
      -- Do something when the interrupt occurs
    End Loop;
  End Relay;

End Interrupt_Test;


I hope this helps,
SteveD