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Method execution with timeout

Posted on 2002-07-19
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Last Modified: 2010-04-04
Greetings, all!

I want to execute some method with timeout.
Suppose there is method foo() and I want to call it and if it had't finished in specified amount of time seconds, I want to cancel it.
How do I do that? Threads I suppose?

Respectfully yours, Eugene.
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Question by:eugenem
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3 Comments
 
LVL 6

Accepted Solution

by:
swift99 earned 200 total points
ID: 7165805
The easy way is to instantiate a thread and an event, kickoff the thread, and wait for the event to be signalled.

var
  FooEvent: TEvent;

procedure MyClass.foo
begin
  FooEvent := TEvent.Create (NIL, false, true, 'FooEvent');
  MyThread := TMyThread.Create; // Assume thread immediately executes
  WaitResult := FooEvent.WaitFor (TimeLimit); // TimeLimit is integer milliseconds
 
  case WaitResult of
  wrSignalled: HandleSuccess;
  wrTimeout: HandleTimeOut;
  wrAbandoned: HandleAbandoned;
  wrError: HandleOtherErrors;
  end;
end;

In the thread, use

procedure TMyThread.Execute;
begin
  // Various business logic
  FooEvent.SetEvent;
end;
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Expert Comment

by:CleanupPing
ID: 9343027
eugenem:
This old question needs to be finalized -- accept an answer, split points, or get a refund.  For information on your options, please click here-> http:/help/closing.jsp#1 
EXPERTS:
Post your closing recommendations!  No comment means you don't care.
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LVL 5

Expert Comment

by:Lukasz Lach
ID: 9461320
eugenem,
No comment has been added lately (18 days), so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area for this question:

RECOMMENDATION: Award points to swift99 http:#7165805

Please leave any comments here within 7 days.

-- Please DO NOT accept this comment as an answer ! --

Thanks,

anAKiN
EE Cleanup Volunteer
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