.net - 连续的 .NET 并行 For - 每个之后阻塞

Question

我连续进行了多个 Parallel.For 操作。

我目前正在检查每个 Parallel.For 的返回值 ParallelLoopResult 并休眠 20 毫秒，直到 IsCompleted 成员设置为 true。

Dim plr as ParallelLoopResult 

plr = Parallel.For(...)

while not plr.IsCompleted
  Thread.Sleep(20)
end while

plr = Parallel.For(...)

while not plr.IsCompleted
  Thread.Sleep(20)
end while

.
.
.

如何添加内核级 block (即 WaitHandle)来代替循环和 Thread.Sleep？ Parallel.For 是否触发完成事件？ Parallel.For 是否提供了这样的机制？

Answer 1

Parallel.For 将完成调用它的所有代码。 IsCompleted 仅返回 false，然后循环被中断。

来自http://msdn.microsoft.com/en-us/library/system.threading.tasks.parallelloopresult.aspx :

If IsCompleted returns true, then the loop ran to completion, such that all iterations of the loop were executed. If IsCompleted returns false and LowestBreakIteration returns null, a call to Stop was used to end the loop prematurely. If IsCompleted returns false and LowestBreakIteration returns a non-null integral value, Break was used to end the loop prematurely.