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ParallelJoinMain.pas
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ParallelJoinMain.pas
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unit ParallelJoinMain;
interface
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;
type
TfrmParallelJoin = class(TForm)
btnJoin2: TButton;
btnJoin3: TButton;
ListBox1: TListBox;
btnDHPJoin: TButton;
btnDHPJoinExc: TButton;
btnJoin1p2: TButton;
procedure btnJoin2Click(Sender: TObject);
procedure btnJoin3Click(Sender: TObject);
procedure btnDHPJoinClick(Sender: TObject);
procedure btnDHPJoinExcClick(Sender: TObject);
procedure btnJoin1p2Click(Sender: TObject);
private
procedure Task1;
procedure Task2;
procedure Task2E;
procedure Task3;
procedure Task3E;
procedure TasksStopped(E: Exception);
procedure QueueLog(const msg: string);
public
end;
var
frmParallelJoin: TfrmParallelJoin;
implementation
uses
System.Threading,
DHPThreading;
{$R *.dfm}
procedure TfrmParallelJoin.btnDHPJoinClick(Sender: TObject);
begin
ListBox1.Items.Add('Starting tasks');
Join([Task1, Task2, Task3]).Await(
procedure
begin
ListBox1.Items.Add('Tasks stopped');
end);
end;
procedure TfrmParallelJoin.btnDHPJoinExcClick(Sender: TObject);
begin
ListBox1.Items.Add('Starting tasks');
Join([Task1, Task2E, Task3E]).Await(TasksStopped);
end;
procedure NullTask;
begin
end;
procedure TfrmParallelJoin.btnJoin1p2Click(Sender: TObject);
begin
ListBox1.Items.Add('Starting tasks');
TParallel.Join([NullTask, Task1, Task2]);
end;
procedure TfrmParallelJoin.btnJoin2Click(Sender: TObject);
begin
ListBox1.Items.Add('Starting tasks');
TParallel.Join(Task1, Task2);
end;
procedure TfrmParallelJoin.btnJoin3Click(Sender: TObject);
begin
ListBox1.Items.Add('Starting tasks');
TParallel.Join([Task1, Task2, Task3]);
end;
procedure TfrmParallelJoin.QueueLog(const msg: string);
begin
TThread.Queue(nil,
procedure
begin
ListBox1.Items.Add(msg);
end);
end;
procedure TfrmParallelJoin.Task1;
begin
QueueLog('Task1 started in thread ' + TThread.Current.ThreadID.ToString);
Sleep(1000);
QueueLog('Task1 stopped in thread ' + TThread.Current.ThreadID.ToString);
end;
procedure TfrmParallelJoin.Task2;
begin
QueueLog('Task2 started in thread ' + TThread.Current.ThreadID.ToString);
Sleep(1000);
QueueLog('Task2 stopped in thread ' + TThread.Current.ThreadID.ToString);
end;
procedure TfrmParallelJoin.Task2E;
begin
QueueLog('Task2E started in thread ' + TThread.Current.ThreadID.ToString);
Sleep(1000);
QueueLog('Task2E raising exception in thread ' + TThread.Current.ThreadID.ToString);
raise Exception.Create('Task2 exception');
end;
procedure TfrmParallelJoin.Task3;
begin
QueueLog('Task3 started in thread ' + TThread.Current.ThreadID.ToString);
Sleep(1000);
QueueLog('Task3 stopped in thread ' + TThread.Current.ThreadID.ToString);
end;
procedure TfrmParallelJoin.Task3E;
begin
QueueLog('Task3E started in thread ' + TThread.Current.ThreadID.ToString);
Sleep(1000);
QueueLog('Task3E raising exception in thread ' + TThread.Current.ThreadID.ToString);
raise Exception.Create('Task3E exception');
end;
procedure TfrmParallelJoin.TasksStopped(E: Exception);
var
i: Integer;
begin
ListBox1.Items.Add('Tasks stopped');
if assigned(E) then
if not (E is EAggregateException) then
raise E
else begin
for i := 0 to EAggregateException(E).Count - 1 do
ListBox1.Items.Add('Task raised exception: ' +
EAggregateException(E)[i].Message);
ReleaseExceptionObject;
end;
end;
end.