How to make a loop with FOR simulating a sleep ?

Posted on 2009-05-14
Last Modified: 2012-05-07
Hello guys,

I have problens with the sleep function because it makes my program stop.
I would like to make a look with for, but I don't know how to simulate the time as I pass to sleep:

Something like this:

For I := 0 to 3000 do Begin

I wonder if 3000 in my FOR is like sleep(3000)

Any clue is welcome
Question by:hidrau
  • 2
LVL 37

Expert Comment

by:Geert Gruwez
ID: 24385666
maybe using threads or a TEvent would be easier
does the rest of the program have to keep running while you are doing something ?
LVL 19

Accepted Solution

MerijnB earned 500 total points
ID: 24385680
Can't you use a timer?

If not, you can try something like this, be aware that you should be careful with using Application.ProcessMessages() though.

uses DateUtils;
// ...
procedure MyDelay(Delay: integer);
var DateTime: TDateTime;
 DateTime := Now();
 while MilliSecondsBetween(Now(), DateTime) < Delay) do

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LVL 37

Expert Comment

by:Geert Gruwez
ID: 24385774
how to make 1 thread wait for another one, with a TEvent:
(pseudo code)

  mainprogram variable:
  E: TEvent;
  E := TEvent.Create(nil, True, False, 'eventwait');

  thread1 :
  has to wait for job finished in thread 2

  Done: Boolean;
  Done := False;
  while not Done do
    case E.WaitFor(3000) of // wait for 3000 msecs
      wrSignaled: Done := True; // job is done
      wrTimeout : ; // job is not finished yet
      wrAbandoned: ; // job was cancelled
      wrError:   : ; // job had error
      wrIOCompletion: ; // who knows what this is ?

  thread2 :
    if CountMessages > 0 then
      E.SetEvent; // signal event, a message was found
  until False;

Author Closing Comment

ID: 31581489

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