如何从主线程完全终止并行任务？

Question

如何从主线程中完全终止这个后台线程，即 OnTerminated 中的代码也不会被执行？

uses
  CodeSiteLogging,
  OtlParallel, OtlTaskControl, OtlTask;

procedure TForm2.btnParallelAsyncClick(Sender: TObject);
begin
  CodeSite.Send('btnParallelAsyncClick 1');

  Parallel.Async(
    procedure(const task: IOmniTask)
    var
      a: Integer;
    begin
      // executed in background thread:
      a := 1 + 1;
      Sleep(2000);
      CodeSite.Send('Executed in Async Thread', a);

      task.Invoke( // used to execute code in main thread
        procedure
        begin
          CodeSite.Send('task.Invoke executed in main thread', a);
        end);

      Sleep(2000);
      CodeSite.Send('Again executed in Async Thread', a);
    end,
    Parallel.TaskConfig.OnTerminated(
    procedure(const task: IOmniTaskControl)
    begin
      // executed in main thread:
      CodeSite.Send('After background thread termination: Executed in Main Thread');
    end
    )
    );

  CodeSite.Send('btnParallelAsyncClick 2');
end;

Answer 1

你不能那样做（除了杀死线程，但请不要那样做）。

添加全局标志shouldSkipTerminate，在创建任务前将其设置为false，在终止任务前将其设置为true并检查是否在OnTerminated.