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unit unit_TestThread;

interface

uses
  Classes;

type
  TTestThread = class(TThread)
  private
    FQuit: Boolean;
  protected
    procedure Execute; override;
  public
    procedure Quit;
  end;

implementation

{ TTestThread }

procedure TTestThread.Execute;
begin

  FQuit := False;

  repeat

    DoSomething;

  until FQuit;

end;

procedure TTestThread.Quit;
begin

  FQuit := True;

end;

end.					

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var
  FTestThread: TTestThread;					

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FTestThread.Quit;
FTestThread.WaitFor;					

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procedure TTestThread.Execute; 
begin 

  repeat 

    DoSomething; 

  until False; 

end;					

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repeat
  DoSometing;
until Terminated;