.NET 4 System.Threading.Barrier 类

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading; 
namespace BarrierDemo 
{ 
    class Program 
    { 
        static Barrier sync; 
        static CancellationToken token; 
        static void Main(string[] args) 
        { 
            var source = new CancellationTokenSource(); 
            token = source.Token; 
            sync = new Barrier(3); 
            var charlie = new Thread(() => DriveToBoston("Charlie", TimeSpan.FromSeconds(1))); charlie.Start(); 
            var mac = new Thread(() => DriveToBoston("Mac", TimeSpan.FromSeconds(2))); mac.Start(); 
            var dennis = new Thread(() => DriveToBoston("Dennis", TimeSpan.FromSeconds(3))); dennis.Start(); 
            //source.Cancel(); 
            charlie.Join(); 
            mac.Join(); 
            dennis.Join(); 
            Console.ReadKey(); 
        } 
        static void DriveToBoston(string name, TimeSpan timeToGasStation) 
        { 
            try 
            { 
                Console.WriteLine("[{0}] Leaving House", name); 
                // Perform some work 
                Thread.Sleep(timeToGasStation); 
                Console.WriteLine("[{0}] Arrived at Gas Station", name); 
                // Need to sync here 
                sync.SignalAndWait(token); 
                // Perform some more work 
                Console.WriteLine("[{0}] Leaving for Boston", name); 
            } 
            catch (OperationCanceledException) 
            { 
                Console.WriteLine("[{0}] Caravan was cancelled! Going home!", name); 
            } 
        } 
    } 
}