BigJob1.mod: Translation to XDS Modula-2

Last updated: 19. 1.1998, 22:42

<* +M2EXTENSIONS *>
MODULE BigJob1;
(*------------------------------------------
   BIGJOB1.C       --- Multithreading Demo
                   (c) Charles Petzold, 1996
   BigJob1.mod     --- Translation to XDS Modula-2
                   (c) Peter Stadler,   1997
  ------------------------------------------*)


IMPORT Windows;


IMPORT SYSTEM;
IMPORT ElapsedTime;
IMPORT RealMath;

CONST REP             =100000;

CONST STATUS_READY    =0;
CONST STATUS_WORKING  =1;
CONST STATUS_DONE     =2;

CONST WM_CALC_DONE    =(Windows.WM_USER + 0);
CONST WM_CALC_ABORTED =(Windows.WM_USER + 1);

TYPE
  PARAMS  =  RECORD
               hwnd       :  Windows.HWND;
               bContinue  :  BOOLEAN;
             END;
  PPARAMS = POINTER TO PARAMS;
TYPE
   Line =  ARRAY[0..50] OF CHAR;
   MsgArray = ARRAY[0..2] OF Line;
CONST
  szAppName = "BigJob1";
VAR
  szMessage : MsgArray;
  lTime : Windows.LONG;

VAR
  hwnd    :  Windows.HWND;
  msg     :  Windows.MSG;
  wc      :  Windows.WNDCLASSEX;
  iStatus :  INTEGER;
  params  :  PARAMS;
  (*
  MessageThread : Threads.Thread;
  *)
(*+++******************************************************************)
PROCEDURE [Windows.CALLBACK] Thread (pvoid : Windows.PVOID): Windows.DWORD;
(**********************************************************************)
VAR
  A  :  LONGREAL;
  i  :  INTEGER;
  lTime2 : Windows.LONG;
  pparams  :  PPARAMS;
  ok : BOOLEAN;
  code : Windows.DWORD;
  lTime1 : Windows.LONG;
BEGIN
     A := 1.0;
     pparams := SYSTEM.CAST(PPARAMS,pvoid);

     lTime1 := ElapsedTime.GetTime ();

     i := 0;
     LOOP
        IF(i=REP) THEN
          EXIT;
        END;
     END;
     IF (i = REP) THEN
          lTime2 := ElapsedTime.GetTime ();
          lTime1 := SYSTEM.CAST(CARDINAL,(SYSTEM.CAST(INTEGER,lTime2) - SYSTEM.CAST(INTEGER,lTime1)));
          Windows.SendMessage (pparams^.hwnd, WM_CALC_DONE, 0, lTime1);
     ELSE
          Windows.SendMessage (pparams^.hwnd, WM_CALC_ABORTED, 0, 0);
     END;
     Windows.ExitThread(code);
     (*
     ok := Threads.KillThread(MessageThread,code);
     *)
     IF(ok) THEN
       RETURN 0;
     END;
END Thread;



    

    

(*++++*****************************************************************)
PROCEDURE [Windows.CALLBACK] WndProc(hwnd       : Windows.HWND;
(**********************************************************************)
                                    iMsg        : Windows.UINT;
                                    wParam      : Windows.WPARAM;
                                    lParam      : Windows.LPARAM) : Windows.LRESULT;

VAR
  szBuffer  : ARRAY[0..63] OF CHAR;
  hdc       : Windows.HDC;
  ps        : Windows.PAINTSTRUCT;
  rect      : Windows.RECT;
  threadHandle : Windows.HANDLE;
  tid          : CARDINAL;

BEGIN
     CASE (iMsg) OF
          | Windows.WM_LBUTTONDOWN :
               IF (iStatus = STATUS_WORKING) THEN
                    Windows.MessageBeep (0);
                    RETURN 0;
               END;

               iStatus := STATUS_WORKING;

               params.hwnd := hwnd;
               params.bContinue := TRUE;
               threadHandle := Windows.CreateThread(WINX.NIL_SECURITY_ATTRIBUTES,100000,SYSTEM.CAST(Windows.LPTHREAD_START_ROUTINE,Thread),
	       SYSTEM.ADR(params),Windows.CREATE_SUSPENDED,tid);
(*
tHandle := Windows.CreateThread(NIL_SECURITY_ATTRIBUTES,
				      stackSize,
				      MyThread,
				      T,
				      CREATE_SUSPENDED,
				      tid);  *)
               (*
               Threads.CreateThread(MessageThread, Thread, SYSTEM.ADR(params), 8192, TRUE);
               *)
               Windows.InvalidateRect (hwnd, NIL, TRUE);
               RETURN 0;

          | Windows.WM_RBUTTONDOWN :
               params.bContinue := FALSE;
               RETURN 0;

          | WM_CALC_DONE :
               lTime := lParam;
               iStatus := STATUS_DONE;
               Windows.InvalidateRect (hwnd, NIL, TRUE);
               RETURN 0;

          | WM_CALC_ABORTED :
               iStatus := STATUS_READY;
               Windows.InvalidateRect (hwnd, NIL, TRUE);
               RETURN 0;

          | Windows.WM_PAINT :
               hdc := Windows.BeginPaint (hwnd, ps);

               Windows.GetClientRect (hwnd, rect);

            (* Windows.wsprintf (szBuffer, szMessage[iStatus], REP, lTime); *)
               Windows.wsprintf (szBuffer, szMessage[iStatus],lTime, REP);


               Windows.DrawText (hdc, szBuffer, -1, rect,
                         Windows.DT_SINGLELINE + Windows.DT_CENTER + Windows.DT_VCENTER);

               Windows.EndPaint (hwnd, ps);
               RETURN 0;

          | Windows.WM_DESTROY :
               Windows.PostQuitMessage (0);
               RETURN 0;
     ELSE
       RETURN Windows.DefWindowProc (hwnd, iMsg, wParam, lParam);
     END;
END WndProc;

(*++++*****************************************************************)
PROCEDURE InitApplication () : BOOLEAN;
(**********************************************************************)
VAR
  rc    :  CARDINAL;
BEGIN
  wc.cbSize        := SIZE(wc);
  wc.style         := Windows.CS_HREDRAW + Windows.CS_VREDRAW;
  wc.lpfnWndProc   := WndProc;
  wc.cbClsExtra    := 0;
  wc.cbWndExtra    := 0;
  wc.hInstance     := Windows.MyInstance();
  wc.hIcon         := Windows.LoadIcon (NIL, Windows.IDI_APPLICATION);
  wc.hCursor       := Windows.LoadCursor (NIL, Windows.IDC_ARROW);
  wc.hbrBackground := SYSTEM.CAST(Windows.HBRUSH, Windows.GetStockObject (Windows.WHITE_BRUSH));
  wc.lpszMenuName  := NIL;
  wc.lpszClassName := SYSTEM.ADR(szAppName);
  wc.hIconSm       := Windows.LoadIcon (NIL,Windows.IDI_APPLICATION);

  rc := Windows.RegisterClassEx(wc);
  RETURN rc#0;
END InitApplication;

(*++++*****************************************************************)
PROCEDURE InitMainWindow () : BOOLEAN;
(**********************************************************************)
BEGIN
  hwnd := Windows.CreateWindow (
                       szAppName,                      (* window class name            *)
                       "Multithreading Demo: Translation to XDS Modula-2",
                                                       (* window caption               *)
                       Windows.WS_OVERLAPPEDWINDOW,    (* window style                 *)
                       Windows.CW_USEDEFAULT,          (* initial x position           *)
                       Windows.CW_USEDEFAULT,          (* initial y position           *)
                       Windows.CW_USEDEFAULT,          (* initial x size               *)
                       Windows.CW_USEDEFAULT,          (* initial y size               *)

                       NIL,                            (* parent window handle         *)
                       NIL,                            (* window menu handle           *)
                       wc.hInstance,                   (* program instance handle      *)
                       NIL);                           (* creation parameters          *)

  IF hwnd = NIL THEN
    RETURN FALSE;
  END;
  Windows.ShowWindow (hwnd, Windows.SW_SHOWDEFAULT);
  Windows.UpdateWindow (hwnd);
  RETURN TRUE;
END InitMainWindow;


BEGIN
  szMessage[0] := "Ready (left mouse button begins)";
  szMessage[1] := "Working (right mouse button aborts)";
  szMessage[2] := "%d msec for %d repetitions";
  IF InitApplication()  AND  InitMainWindow() THEN
    WHILE (Windows.GetMessage(msg,NIL,0,0)) DO
      Windows.TranslateMessage(msg);
      Windows.DispatchMessage(msg);
    END;
  END;
END BigJob1.