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Newsgroups: comp.lang.ada
Date: Sun, 21 Sep 2014 09:03:39 -0700 (PDT)
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Subject: Re: Simp,e example for 2 tasks
From: Stribor40 <ikamzic@gmail.com>
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Date: 2014-09-21T09:03:39-07:00
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> 
> 
> 
> >Would anyone be able to post simple example of ada program showing 2 tasks taking to each other please.  For example one task sends message to another saying "hi" and second tasks replying "hi back". 
> 
> >I am having troubles finding example of simple program like this online
> 
> 
> 
> 	Well... The problem domain is slightly under-specified.
> 
> 
> 
> 	Ada doesn't "send message" in the way you may be thinking. It's more a
> 
> "pass a note during a handshake" (Rendezvous).
> 
> 
> 
> 	The problem with your description is that of sequencing. A straight
> 
> linear interpretation is:
> 
> 
> 
> Task A										Task B
> 
> begin										begin
> 
> rendezvous with Task B					wait for rendezvous from any task
> 
> 												end rendezvous
> 
> wait for rendezvous from any task			rendezvous with Task A
> 
> 	end rendezvous
> 
> end											end
> 
> 
> 
> 	There is nothing being passed there -- the rendezvous itself is the
> 
> "message". There is also no work being done inside the rendezvous. AND the
> 
> sequence is pretty much lock-step: B does nothing until A connects, then A
> 
> does nothing until B decides to connect to it.
> 
> 
> 
> 	An alternative would be using an IN and OUT parameter on the rendezvous
> 
> 
> 
> begin										begin
> 
> rendezvous with B("Hello", reply)			wait for rendezvous(IN msg,
> 
> 																OUT reply)
> 
> 												reply = "Hello Back"
> 
> 												end rendezvous
> 
> end											end
> 
> 
> 
> 	Here there is only one rendezvous... one "handshake"; A does nothing
> 
> during the rendezvous until B ends the rendezvous after doing whatever it
> 
> wants (setting reply).
> 
> 
> 
> 											
> 
> -- 
> 


can I be greedy and ask you can make actuall code that will compile so i can play with it please.