mirror of
https://gitlab.com/freepascal.org/lazarus/lazarus.git
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559 lines
14 KiB
ObjectPascal
559 lines
14 KiB
ObjectPascal
{
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/***************************************************************************
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synchronize - example
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---------------------
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Just a simple example to show & verify functionality
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of the lazarus TThread.Synchronize / TProgressBar classes.
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Initial Revision : Sun Aug 15 1999
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by Stefan Hille <stoppok@osibisa.ms.sub.org>
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and Micha Nelissen
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***************************************************************************/
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***************************************************************************
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* *
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* This source is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This code is distributed in the hope that it will be useful, but *
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* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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* General Public License for more details. *
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* *
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* A copy of the GNU General Public License is available on the World *
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* Wide Web at <http://www.gnu.org/copyleft/gpl.html>. You can also *
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* obtain it by writing to the Free Software Foundation, *
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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* *
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***************************************************************************
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}
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program Synchronize;
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{$mode objfpc}{$H+}
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{ threading directive not needed anymore for 1.9.8+ }
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{ $threading on}
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uses
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{$ifdef UNIX}
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CThreads,
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{$endif}
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Interfaces, Classes, StdCtrls, Forms, Buttons, Menus, ComCtrls,
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SysUtils, Extctrls;
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type
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TAThread = class(TThread)
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protected
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FTargetListBox: TListBox;
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FTargetProgress: TProgressBar;
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FTestStrings: TStrings;
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procedure ExecDone;
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procedure ShowStrings;
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public
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constructor Create(CreateSuspended: boolean);
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destructor Destroy; override;
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end;
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TThread1 = class(TAThread)
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public
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constructor Create;
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procedure Execute; override;
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end;
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TThread2 = class(TAThread)
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public
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constructor Create;
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procedure Execute; override;
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end;
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TForm1 = class(TForm)
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public
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Progre1: TProgressBar;
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Progre2: TProgressBar;
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Progre3: TProgressBar;
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Listbox1: TListBox;
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Listbox2: TListBox;
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Thread1: TThread1;
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Thread2: TThread2;
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ThreadList: TList;
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Button1: TButton;
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Button2: TButton;
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Button3: TButton;
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Button4: TButton;
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Button5: TButton;
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Button6: TButton;
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Button7: TButton;
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Button8: TButton;
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Button9: TButton;
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Button10: TButton;
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mnuFile: TMainMenu;
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itmFileQuit: TMenuItem;
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constructor Create(AOwner: TComponent); override;
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destructor Destroy; override;
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procedure LoadMainMenu;
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procedure mnuQuitClicked(Sender : TObject);
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protected
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procedure Button1CLick(Sender : TObject);
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procedure Button2CLick(Sender : TObject);
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procedure Button3CLick(Sender : TObject);
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procedure Button4CLick(Sender : TObject);
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procedure Button5CLick(Sender : TObject);
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procedure Button6CLick(Sender : TObject);
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procedure Button7CLick(Sender : TObject);
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procedure Button8CLick(Sender : TObject);
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procedure Button9CLick(Sender : TObject);
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procedure Button10CLick(Sender : TObject);
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function CloseQuery: boolean; override;
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end;
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threadvar
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threadvartest: integer;
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var
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Form1 : TForm1;
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TotalCount: integer;
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{ GlobalData is an example of what you should NOT do :)
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Access from multiple threads to same variable unprotected }
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GlobalData: integer;
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constructor TAThread.Create(CreateSuspended: boolean);
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begin
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inherited;
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FTestStrings := TStringList.Create;
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end;
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destructor TAThread.Destroy;
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begin
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inherited;
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FTestStrings.Free;
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end;
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procedure TAThread.ExecDone;
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var
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lPos: integer;
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begin
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Form1.ThreadList.Remove(Self);
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FTargetListBox.Items.Insert(0, 'Thread terminated');
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if Form1.ThreadList.Count = 0 then
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begin
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lPos := Pos('[', Form1.Caption);
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if lPos > 0 then
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Form1.Caption := Copy(Form1.Caption, 1, lPos - 1) + '[done, ready to exit]';
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end;
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end;
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procedure TAThread.ShowStrings;
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var
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i: integer;
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begin
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FTargetListBox.Items.BeginUpdate;
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for i := 0 to FTestStrings.Count - 1 do
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begin
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FTargetListBox.Items.Insert(0, FTestStrings.Strings[i]);
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while FTargetListBox.Items.Count > 30 do
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FTargetListBox.Items.Delete(FTargetListBox.Items.Count-1);
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end;
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FTargetListBox.Items.EndUpdate;
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FTestStrings.Clear;
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if FTargetProgress.Position = FTargetProgress.Max then
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FTargetProgress.Position := FTargetProgress.Min;
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FTargetProgress.StepIt;
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end;
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constructor TThread1.Create;
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begin
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FTargetListBox := Form1.Listbox1;
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FTargetProgress := Form1.Progre1;
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FreeOnTerminate := true;
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inherited Create(false);
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end;
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function DoCalculation: integer;
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var
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i, k: integer;
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j: array[0..511] of integer;
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begin
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for i := 0 to 100000 do
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begin
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j[i mod $1ff] := i * i;
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k := j[(i + 3) and $1ff] div (i+1);
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j[(i + 5) and $1ff] := k - 3;
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end;
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result := j[5];
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end;
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procedure TThread1.Execute;
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var
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i: integer;
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begin
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threadvartest := 10;
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FTestStrings.Add('Threadvar is @'+IntToStr(ptrint(@threadvartest)));
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for i := 0 to TotalCount - 1 do
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begin
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GlobalData += 3;
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DoCalculation;
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FTestStrings.Add('Information: '+IntToStr(GlobalData-3)+' '+IntToStr(threadvartest));
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GlobalData -= 3;
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DoCalculation;
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Synchronize(@ShowStrings);
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threadvartest := 10;
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if Terminated then break;
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end;
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Synchronize(@ExecDone);
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end;
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constructor TThread2.Create;
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begin
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FTargetListBox := Form1.Listbox2;
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FTargetProgress := Form1.Progre2;
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FreeOnTerminate := true;
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inherited Create(false);
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end;
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procedure TThread2.Execute;
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var
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i: integer;
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begin
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threadvartest := 15;
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FTestStrings.Add('Threadvar is @'+IntToStr(ptrint(@threadvartest)));
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for i := 0 to TotalCount - 1 do
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begin
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GlobalData -= 3;
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DoCalculation;
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FTestStrings.Add('Information: '+IntToStr(GlobalData+3)+' '+IntToStr(threadvartest));
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threadvartest := 15;
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GlobalData += 3;
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DoCalculation;
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if (i and $3) = $3 then
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Synchronize(@ShowStrings);
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if Terminated then break;
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end;
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Synchronize(@ExecDone);
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end;
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constructor TForm1.Create(AOwner: TComponent);
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begin
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inherited CreateNew(AOwner, 1);
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Caption := 'Thread Synchronize Demo v0.1';
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ThreadList := TList.Create;
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LoadMainMenu;
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end;
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destructor TForm1.Destroy;
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begin
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inherited;
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FreeAndNil(ThreadList);
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end;
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function TForm1.CloseQuery: boolean;
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var
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I: integer;
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begin
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if ThreadList.Count > 0 then
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begin
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Caption := Caption + ' [wait for threads termination]';
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for I := 0 to ThreadList.Count - 1 do
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TThread(ThreadList.Items[I]).Terminate;
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Result := false;
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end else
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inherited;
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end;
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procedure TForm1.Button1Click(Sender : TObject);
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Begin
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if assigned (progre3) then begin
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progre3.Position := 0;
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progre3.Min := progre3.Min - 1
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end;
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End;
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procedure TForm1.Button2Click(Sender : TObject);
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Begin
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if assigned (progre3) then begin
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progre3.Position := 0;
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progre3.Min := progre3.Min + 1;
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end;
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End;
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procedure TForm1.Button3Click(Sender : TObject);
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Begin
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if assigned (progre3) then begin
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progre3.Position := 0;
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progre3.Max := progre3.Max +1;
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end;
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End;
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procedure TForm1.Button4Click(Sender : TObject);
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Begin
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if assigned (progre3) then begin
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progre3.Position := 0;
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progre3.Max := progre3.Max -1;
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end;
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End;
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procedure TForm1.Button10Click(Sender : TObject);
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Begin
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if assigned (progre3) then begin
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if progre3.position >= progre3.max then
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progre3.position := progre3.min;
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progre3.stepit;
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end;
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End;
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procedure TForm1.Button5Click(Sender : TObject);
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Begin
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if assigned (progre1) then begin
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Progre1.Smooth := not Progre1.Smooth;
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if assigned (Button6)
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then Button6.Visible := Progre1.Smooth;
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end;
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End;
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procedure TForm1.Button6Click(Sender : TObject);
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Begin
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if assigned (progre1) then begin
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Progre1.BarShowtext := not Progre1.BarShowtext;
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end;
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End;
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procedure TForm1.Button7Click(Sender : TObject);
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Begin
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if assigned (progre1) then
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begin
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case Progre1.Orientation of
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pbVertical : Progre1.Orientation := pbRightToLeft;
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pbRightToLeft : Progre1.Orientation := pbTopDown;
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pbTopDown : Progre1.Orientation := pbHorizontal;
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pbHorizontal : Progre1.Orientation := pbVertical;
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end;
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end;
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end;
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procedure TForm1.Button8Click(Sender : TObject);
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begin
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{ Create the threads }
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TotalCount := 1000;
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GlobalData := 100;
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threadvartest := 20;
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Thread1 := TThread1.Create;
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Thread2 := TThread2.Create;
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ThreadList.Add(Thread1);
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ThreadList.Add(Thread2);
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End;
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procedure TForm1.Button9Click(Sender : TObject);
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begin
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Listbox1.Items.Clear;
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Listbox2.Items.Clear;
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end;
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{------------------------------------------------------------------------------}
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procedure TForm1.LoadMainMenu;
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begin
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{ set the height and width }
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Height := 350;
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Width := 700;
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{ Create a progressbar }
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Progre1 := TProgressBar.Create (Self);
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with Progre1 do
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begin
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Parent := Self;
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SetBounds(300, 10, 250, 20);
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Min := 0;
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Max := 10;
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Step := 1;
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BarShowText := true;
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Smooth := True;
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Show;
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end;
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Progre2 := TProgressBar.Create (Self);
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with Progre2 do
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begin
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Parent := Self;
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SetBounds(300, 35, 250, 20);
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Min := 0;
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Max := 10;
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Step := 1;
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BarShowText := true;
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Smooth := True;
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Show;
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end;
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Progre3 := TProgressBar.Create (Self);
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with Progre3 do
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begin
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Parent := Self;
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SetBounds(300, 60, 250, 20);
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Min := 0;
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Max := 10;
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Step := 1;
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BarShowText := true;
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Smooth := True;
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Show;
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end;
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{ create listboxes to show thread results }
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Listbox1 := TListBox.Create(self);
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with Listbox1 do
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begin
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Parent := self;
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SetBounds(10, 120, 200, 180);
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end;
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Listbox2 := TListBox.Create(self);
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with Listbox2 do
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begin
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Parent := self;
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SetBounds(250, 120, 200, 180);
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end;
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{ Create a few buttons }
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Button2 := TButton.Create(Self);
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Button2.Parent := Self;
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Button2.Left := 200;
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Button2.Top := 70;
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Button2.Width := 80;
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Button2.Height := 30;
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Button2.Show;
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Button2.Caption := 'PMin ++';
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// Button2.ToolTip := 'Tool Tip';
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// Button2.ShowToolTip := True;
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Button2.OnClick := @Button2Click;
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Button1 := TButton.Create(Self);
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Button1.Parent := Self;
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Button1.Left := 50;
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Button1.Top := 70;
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Button1.Width := 80;
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Button1.Height := 30;
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Button1.Show;
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Button1.Caption := 'PMin--';
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Button1.OnClick := @Button1Click;
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{ Create 2 more buttons outside the groupbox }
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Button3 := TButton.Create(Self);
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Button3.Parent := Self;
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Button3.Left := 50;
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Button3.Top := 30;
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Button3.Width := 80;
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Button3.Height := 30;
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Button3.Show;
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Button3.Caption := 'PMax++';
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// Button3.ToolTip := 'Tool Tip';
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// Button3.ShowToolTip := True;
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Button3.OnClick := @Button3Click;
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Button4 := TButton.Create(Self);
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Button4.Parent := Self;
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Button4.Left := 200;
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Button4.Top := 30;
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Button4.Width := 80;
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Button4.Height := 30;
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Button4.Show;
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Button4.Caption := 'PMax--';
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Button4.OnClick := @Button4Click;
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Button10 := TButton.Create(Self);
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with Button10 do
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begin
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Parent := Self;
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SetBounds(140, 30, 50, 30);
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Show;
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Caption := 'Step It';
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OnClick := @Button10Click;
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end;
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Button5 := TButton.Create(Self);
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Button5.Parent := Self;
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Button5.Left := 500;
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Button5.Top := 110;
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Button5.Width := 130;
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Button5.Height := 30;
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Button5.Show;
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Button5.Caption := 'Toggle Smooth';
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Button5.OnClick := @Button5Click;
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Button6 := TButton.Create(Self);
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Button6.Parent := Self;
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Button6.Left := 500;
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Button6.Top := 150;
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Button6.Width := 130;
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Button6.Height := 30;
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Button6.Show;
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Button6.Caption := 'Toggle Text';
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Button6.OnClick := @Button6Click;
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Button6.Visible := Progre1.Smooth;
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Button7 := TButton.Create(Self);
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Button7.Parent := Self;
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Button7.Left := 500;
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Button7.Top := 190;
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Button7.Width := 130;
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Button7.Height := 30;
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Button7.Show;
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Button7.Caption := 'Orientation';
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Button7.OnClick := @Button7Click;
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Button8 := TButton.Create(Self);
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with Button8 do
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begin
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Parent := Self;
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SetBounds(500, 230, 130, 30);
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Show;
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Caption := 'Thread test';
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OnClick := @Button8Click;
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end;
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Button9 := TButton.Create(Self);
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with Button9 do
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begin
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Parent := Self;
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SetBounds(500, 270, 130, 30);
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Show;
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Caption := 'Clear listboxes';
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OnClick := @Button9Click;
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end;
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{ create a menubar }
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mnuFile := TMainMenu.Create(Self);
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mnuFile.Name:='mnuFile';
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Menu := mnuFile;
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itmFileQuit := TMenuItem.Create(Self);
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itmFileQuit.Caption := 'Quit';
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itmFileQuit.OnClick := @mnuQuitClicked;
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mnuFile.Items.Add(itmFileQuit);
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end;
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{------------------------------------------------------------------------------}
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procedure TForm1.mnuQuitClicked(Sender : TObject);
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begin
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Close;
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end;
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{------------------------------------------------------------------------------}
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begin
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Application.Initialize; { calls InitProcedure which starts up GTK }
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Application.CreateForm(TForm1, Form1);
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Application.Run;
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end.
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