线程中的'join'是什么意思（VC ++ 2010）？

Question

我读了老师的代码，但我不明白。谁能告诉我这里的加入意味着什么？

    AddTask ^task1 = gcnew AddTask();
AddTask ^task2 = gcnew AddTask();
AddTask ^task3 = gcnew AddTask();

// First Method
Thread ^thread1 = gcnew Thread ( gcnew ParameterizedThreadStart( task1, &AddTask::Add ) );
Thread ^thread2 = gcnew Thread ( gcnew ParameterizedThreadStart( task1, &AddTask::Add ) );
Thread ^thread3 = gcnew Thread ( gcnew ParameterizedThreadStart( task1, &AddTask::Add ) );

thread1->Start("First");
thread2->Start("Second");
thread3->Start("Third");

thread1->Join();
thread2->Join();
thread3->Join();

Answer 1

Join函数阻塞调用线程，直到线程终止，同时继续执行标准COM和SendMessage抽取。

http://msdn.microsoft.com/en-us/library/95hbf2ta.aspx

Answer 2

.Join暂停线程或阻塞调用线程，直到线程终止。

ParameterizedThreadStart表示在线程中使用了一个参数

thread1->Start("First"); //''as you see there is a parameter: First,Second,Third
thread2->Start("Second");
thread3->Start("Third");

//''The threads starts at the same time and terminate at the same time
thread1->Join();
thread2->Join();
thread3->Join();

link of thread->Join

link of ParameterizedThreadStart