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From: adam@irvine.com
Newsgroups: comp.lang.ada
Subject: Requeue and IN OUT parameters
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Date: 4 May 2001 20:28:57 GMT
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Date: 2001-05-04T20:28:57+00:00
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I have a couple more questions about protected objects.  Here's the first 
question; the second will be in a separate post.

9.5.4(11) says that if an entry body completes other than by a
requeue, the program returns to the caller and any copy-back of
parameters occurs.  What happens to the parameters if the entry
body does a requeue?  In this example:

    protected PR is
       entry E1 (Count : in out integer);
       entry E2 (Count : in out integer);
    end PR;

    protected body PR is
       entry E1 (Count : in out integer) when Some_Condition is
       begin
           if Blah_Blah_Blah then
               Count := Count + 1;
               requeue E2;
           end if;
           Do_A_Bunch_Of_Other_Stuff;
       end E1;
    . . .

In this example, does the effect of the statement "Count := Count + 1"
become lost?  Is the value E2 sees the original value of Count, the
incremented value, or implementation-dependent?

(Actually, I believe this question is pertinent to task entries also.)

				-- thanks, Adam

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