Subject: RE: SDL-News: about the time type in SDL
michael.andersson#telelogic.com
Date: Mon Aug 18 2003 - 12:02:42 GMT
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-----From michael.andersson#telelogic.com to sdlnews -----
Hi Yang,
If you are using the Discrete Time Simulator, then you are correct, now will
return a time value calculated by executed timer timeouts in the execution
so far (and not according to some clock value).
However, if you are using the Realtime Simulator or an Application, then now
will return a value obtained from a clock function. This clock function
might be implemented slightly different depending on your platform (Windows,
Solaris, HP, target RTOS etc.), but it can also be controlled by the user so
that you can provide your own implementation (time unit, granularity etc.)
of this clock function. Please see the user documentation for more info on
this.
Simulated time is highly valueable in certain kinds of simulation, when you
focus on the behaviour of the system regardless of normal linear time (for
example, to simulate the solar system orbits would be quite tedious with a
real-time clock).
best regards
Michael
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> -----Original Message-----
> From: yy01#mails.tsinghua.edu.cn [mailto:yy01#mails.tsinghua.edu.cn]
> Sent: den 18 augusti 2003 13:44
> To: sdlnews#sdl-forum.org
> Subject: SDL-news: about the time type in SDL
>
>
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> <http://www.sdl-forum.org/Society/members.htm>
> The originator of this message is responsible for its
> content. -----From "" <yy01#mails.tsinghua.edu.cn> to sdlnews -----
>
> Hi,members,
> I have a question about the time type in SDL programming. I
> am now using Telelogic Tau 4.3 and We all know that "now" is
> the only predefined value of time type. But I don't know if
> "now" can give the actual system time? In simulations, I
> found out that time in SDL only makes an abstract sense, and
> it is only used to schedule events. It seems that it has no
> relations with the physical time.
> I hope to stamp the received packet with the current system
> time, Can "now" be useful? If not, what should I do?
> Thanks in advance!
> Best regards,
> Yang Yang
>
>
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