From: "Jeffrey D. Cherry" <yrrehcdj@hcetu.ten>
Subject: Re: Delay
Date: Wed, 10 Jul 2002 16:01:20 -0000
Date: 2002-07-10T16:01:20+00:00 [thread overview]
Message-ID: <Xns92475BF0AC1CAjdcherryutechnet@216.168.3.40> (raw)
In-Reply-To: 3D2C3CE1.1080501@yahoo.com
David Rasmussen <pinkfloydhomer@yahoo.com> wrote in news:3D2C3CE1.1080501
@yahoo.com:
> How do I make a delay in an Ada program?
>
> /David
>
Use the 'delay' statement. Refer to section 9.6 of the Ada Reference
Manual.
From section 9.6 of the Ada RM:
"A delay_statement is used to block further execution until a specified
expiration time is reached. The expiration time can be specified either as a
particular point in time (in a delay_until_statement), or in seconds from
the current time (in a delay_relative_statement)."
Examples from that same section:
"Example of a relative delay statement:
delay 3.0; -- delay 3.0 seconds
Example of a periodic task:
declare
use Ada.Calendar;
Next_Time : Time := Clock + Period;
-- Period is a global constant of type Duration
begin
loop -- repeated every Period seconds
delay until Next_Time;
... -- perform some actions
Next_Time := Next_Time + Period;
end loop;
end;"
Note that the data type of the delay expression (the value appearing after
the reserved word 'delay') differs in the two forms of the delay statement.
The relative delay accepts a delay expression of type duration (a standard
data type) while the delay until accepts a value of some "time" type. The
example above shows that the delay until uses the data type "Time" defined
in the standard package Ada.Calendar.
Hope that helps!
--
Regards,
Jeffrey D. Cherry
Senior IV&V Analyst
Northrop Grumman Information Technology
prev parent reply other threads:[~2002-07-10 16:01 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-10 13:55 Delay David Rasmussen
2002-07-10 14:17 ` Delay David C. Hoos
2002-07-10 16:01 ` Jeffrey D. Cherry [this message]
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