[NumLock]

Critical Section Objects

Код:

unit Unit1;

interface

uses
  SyncObjs,
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

  CriticalSection: TCriticalSection;
  ArrID: array [0..6] of Integer = (1, 2, 7, 9, 10, 21, 23);
  CurrentID: Integer;

implementation

{$R *.dfm}

function GetNextArrID: Integer;
begin
  CriticalSection.Enter;
  try
    if CurrentID<Length(ArrID) then Result:=ArrID[CurrentID] else Result:=-1;
    Inc(CurrentID);
  finally
    CriticalSection.Leave;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  Edit1.Text:=IntToStr(GetNextArrID);
end;

initialization
  CriticalSection:=TCriticalSection.Create;
  CurrentID:=0;

finalization
  CriticalSection.Free;

end.