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Date: Mon, 19 Mar 2012 12:29:01 +0100
From: Georg Bauhaus <rm.dash-bauhaus@futureapps.de>
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Subject: Re: Ada and linux real time
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Date: 2012-03-19T12:29:01+01:00
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On 18.03.12 23:03, slos wrote:

>          delay until Next_Time;
> 
>          MyDuration := To_Duration (Clock - Next_Time);

I haven't looked very closely, but if, say, Next_Time has
a value of 12 o'clock, then

   delay until Next_Time;

   -- (it is now 12 o'clock)

   My_Duration := Clock - Next_Time;

will likely measure 12 o'clock - 12 o'clock, unless performing
"-" takes time, or (parts of) the assignment statement is (are)
put on hold by the scheduler, interrupting the task.
I think that's unlike Simon's program, which subtracts
a starting time, not next_time, from the current time.


Minor comment on Threshold:  If you assign

   Thresholds :=
     (1 => MyPeriodDuration *  0.001,
      2 => MyPeriodDuration *  0.005,
      ...);

then the compiler will check that every slot gets a value.
If you run the compiler with switch -gnatwa (when using GNAT),
it will give a few more useful warnings.