Lock/Unlock-Mechanismus ohne Bezug auf Multithreading?

[Uwe Raabe]

Das ist jetzt vermutlich zu trivial:

Delphi-Quellcode:

type
  TLock = record
  private
    FLocked: Boolean;
    class function Create: TLock; static;
  public
    function TryLock: Boolean;
    procedure Unlock;
    property Locked: Boolean read FLocked;
  end;

class function TLock.Create: TLock;
begin
  Result.FLocked := False;
end;

function TLock.TryLock: Boolean;
begin
  Result := not FLocked;
  FLocked := True;
end;

procedure TLock.Unlock;
begin
  FLocked := False;
end;