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From: "Anh Vo" <anhvofrcaus@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Designing Timers using Ada.Real_Time.Timing_Events package
Date: 26 Mar 2006 08:18:56 -0800
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Date: 2006-03-26T08:18:56-08:00
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>> I did not know that it is possible to use protected objects
>> functionally while each timer used for different purpose. Could you
>> elaborate further?

> Why not? Each protected object would be a simple event. The handler set for
> Ada.Real_Time.Timing_Events triggers an event(s). The functionality, i.e.
> what has to be done upon the event, is outside. It happens in the task
> waiting for the event.

it works only if there is a specific purpose associated with an event.
In other word, an event handler must be set for a specific action. The
timers work almost like a generic in that the event is set once. The
action is supplied at the time of instantiation.

 > (I don't have GNAT GPL installed)

GNAT GPL has not implemented Timing_Events yet. GNAT under gcc-4.2.0 is
needed.

> Decoupling. The model one task - one callback is too specialized and
> exposed to misuse. You might wish to have more than one task, you might
> want handling the timer events on different contexts, routing and
> re-routing them between tasks.

For each timer defined through derivation, it is run under a separate
task. In case of Safe_Timers there are two tasks, additional task
needed for decoupling, running. Therefore, they are completely
separated between callbacks.

AV