unit Unit1;

interface

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

procedure incedit1; stdcall;
procedure incedit2; stdcall;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Edit1: TEdit;
    Edit2: TEdit;
    Button6: TButton;
    Button7: TButton;
    Button2: TButton;
    Button3: TButton;
    Button5: TButton;
    Button4: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button6Click(Sender: TObject);
    procedure Button7Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure Button5Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

var
  th1, th2: cardinal;
  h1, h2: integer;

procedure incedit1;
var
  i: integer;
begin
  i := 0;
  while true do
  begin
    form1.edit1.text := inttostr(i);
    i := i + 1;
  end;
end;

procedure incedit2;
var
  i: integer;
begin
  i := 0;
  while true do
  begin
    form1.edit2.text := inttostr(i);
    i := i + 1;
  end;
end;
{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
begin
  h1 := beginthread(nil, 1024, @incedit1, nil, 0, th1);
  h2 := beginthread(nil, 1024, @incedit2, nil, 0, th2);
end;

procedure TForm1.Button6Click(Sender: TObject);
begin
  terminatethread(h1, 0);
end;

procedure TForm1.Button7Click(Sender: TObject);
begin
  terminatethread(h2, 0);
end;

procedure TForm1.Button4Click(Sender: TObject);
begin
  resumethread(h1);
end;

procedure TForm1.Button5Click(Sender: TObject);
begin
  resumethread(h2);
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  suspendthread(h1);
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
  suspendthread(h2);
end;

end.