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unit TimerThread;

interface

uses
  classes, windows;

type
  TTimerInterval = 10..High(LongWord);

  PTimerItem = ^TTimerItem;
  TTimerItem = record
    Method: TNotifyEvent;
    Interval: TTimerInterval;
    Periodic: Boolean;
    Start: Int64;
  end;

  TTimerThread = class(TThread)
  private
    FList: TThreadList;
    FActEvent: TNotifyEvent;
  protected
    procedure Execute; override;
    procedure DoTimeEvent;
  public
    constructor Init;
    destructor Destroy; override;
    procedure StartTimer(Event: TNotifyEvent; Interval: TTimerInterval; Periodic: Boolean);
    procedure StopTimer(Event: TNotifyEvent);
  end;

implementation

procedure TTimerThread.DoTimeEvent;
begin
  FActEvent(Self);
end;

procedure TTimerThread.Execute;
var
  i: Integer;
  Time: LongWord;
begin
  while not Terminated do
  begin
    Sleep(1);
    i := 0;
    with FList.LockList do
      try
        while i < Count do begin
          if PTimerItem(Items[i]) <> nil then
          begin
            with PTimerItem(Items[i])^ do
            begin
              Time := GetTickCount;
              if Time < Start then Dec(Start, High(LongWord)); //Überlauf abfangen
              if (Time - Start) >= Interval then
              begin
                if Periodic then
                  Start := Time // nächstes Intervall vorbereiten
                else
                  StopTimer(Method);
                { Methode ausführen :}
                FActEvent := PTimerItem(Items[i])^.Method;
                Synchronize(DoTimeEvent);
              end;  { if (Time - Start).. }
            end;  { with PTimerItem(Items[i])^.. }
          end;  { if PTimerItem(Items[i]) <> nil }
          Inc(i);
        end; { while i < Count }
      finally
        FList.UnlockList;
      end;
  end; { while not Terminated }
end;

procedure TTimerThread.StartTimer(Event: TNotifyEvent; Interval: TTimerInterval;
  Periodic: Boolean);
var
  p: PTimerItem;
begin
  New(p);
  p^.Method := Event;
  p^.Interval := Interval;
  p^.Periodic := Periodic;
  FList.Add(p);
  p^.Start := GetTickCount;

  if Suspended then Resume;
end;

procedure TTimerThread.StopTimer(Event: TNotifyEvent);
var
  i:Integer;
  p: PTimerItem;
begin
  with FList.LockList do
    try
      for i := Pred(Count) downto 0 do
      begin
        if (@PTimerItem(Items[i])^.Method = @Event) then
        begin
          p := Items[i];
          Items[i] := nil;
          Dispose(p);
          Delete(i);
          Break;
        end;
      end;
      if Count = 0 then Suspend;
    finally
      FList.UnlockList;
    end;
end;

constructor TTimerThread.Init;
begin
  inherited Create(False);
  FList := TThreadList.Create;
  Priority := tpTimeCritical; // möglich durch Sleep(1) im Execute
end;

destructor TTimerThread.Destroy;
var
  i: Integer;
  p: PTimerItem;
begin
  Terminate;
  WaitFor;
  with FList.LockList do
  try
    for i := Pred(Count) downto 0 do
    begin
      p := Items[i];
      Items[i] := nil;
      Dispose(p);
    end;
  finally
    FList.UnlockList;
  end;
  FList.Free;
  inherited;
end;

end.					

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var Timers: TTimerThread;
...
//FormCreate:
  Timers := TTimerThread.Init;
  Timers.StartTimer(Button1Click, 1000, False);
  Timers.StartTimer(Button2Click, 200, True);
...
//FormClose:
  Timers.Free;