Subject: FW: TR: Q23/17
From: Rick Reed TSE (rickreed#tseng.co.uk)
Date: Thu Nov 08 2001 - 20:39:40 GMT
Dear Colleagues,
I am somewhat puzzled by the agenda for this meeting.
1. A construct to trigger an action at a specific point of time
How can this be achieved if there not a computing resource available to
execute the action? (because the computing resources are executing other
actions possibly in other agents).
If each state machine has its own processor, why cannot the timer mechanism
as defined in Z.100 can be used to run the action at a specific time?
Alternatively if the agent is waiting in a state, why cannot NOW = time in a
continuous signal be used to run the action at a specific time?
What does running an action at a specific time mean for a distributed or
multi-processor system?
2. "Time to expiration" for all types of timers
What does "all types of timer" mean? (Z.100 only defines one type of timer)
3. Periodic timers
Why is the method of adding a fixed amount to to the previous expiry time
inadequate?
That is:
TIMER T;
DCL next_time Time := 0;
SYNONYM period Time = EXTERNAL; /*the period*/
...
next_time := next_time + period;
SET ( next_time, T);
4. Reference Time, Clocks
What are these?
5. Necessity to introduce time units?
Why is this necessary?
Why is it inadequate to define (external to the SDL) the time units for a
particular SDL model?
--What documents are available to answer these questions? Where can they be found? Who have the documents been circulated to? What status do they have?
-- Rick Reed - rickreed#tseng.co.uk Tel:+44 1455 55 96 55 Fax:+44 1455 55 96 58 Mob.:+44 7970 50 96 50
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> The meeting will start on 11/20/01 at 10 or 11 AM, depending on the > arrival time of our French expert members. We have planned an agenda > with the following topics: > > TOP 0) Introduction of the members of the meeting. > TOP 1) Short overview of the main tasks and projects within the Department > > What is missing in Z.100? > > TOP 2.1) A construct to trigger an action at a specific point of time > TOP 2.2) "Time to expiration" for all types of timers > TOP 2.3) Periodic timers > TOP 2.4) Reference time > TOP 2.5) Clocks > TOP 2.6) Necessity to introduce time units?
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