Concurrency::parallel_for,牛逼了，它是不会动态调配线程的

[GKatHere]

// vs 2017
Concurrency::parallel_for(0, 10,// cpu核数4
		[](int nt) {
		switch (nt)
		{
		case 0:
		case 1:
		case 2:
			printf("nt: %d, \n", nt);
			do
			{
				Sleep(1);
			} while (1);
			break;
		default:
			printf("nt: %d, \n", nt);

		}});