多线程06-Lock

    class Program
    {
        static void Main()
        {
            Console.WriteLine("Start");
            var c = new Counter();
            var t1 = new Thread(() => TestCounter(c));
            var t2 = new Thread(() => TestCounter(c));
            var t3 = new Thread(() => TestCounter(c));
            t1.Start();
            t2.Start();
            t3.Start();
            Console.WriteLine("Total:{0}", c.Count);
            var d = new CounterWithLock();
            var d1 = new Thread(() => TestCounter(d));
            var d2 = new Thread(() => TestCounter(d));
            var d3 = new Thread(() => TestCounter(d));
            d1.Start();
            d2.Start();
            d3.Start();
            Console.WriteLine("Total:{0}", d.Count);
            //Console.ReadKey();
        }
        static void TestCounter(CounterBase c)
        {
            for (var i = 0; i < 10000000; i++)
            {
                c.Increment();
                c.Decrement();
            }
        }
        class Counter : CounterBase
        {
            private int _counter;
            public int Count { get { return _counter; } }
            public override void Increment()
            {
                _counter++;
            }
            public override void Decrement()
            {
                _counter--;
            }
        }
        class CounterWithLock : CounterBase
        {
            private int _counter;
            public int Count { get { return _counter; } }
            public readonly object _synvRoot = new object();
            public override void Increment()
            {
                lock (_synvRoot)
                {
                    _counter++;
                }
            }
            public override void Decrement()
            {
                lock (_synvRoot)
                {
                    _counter--;
                }
            }
        }
        abstract class CounterBase
        {
            public abstract void Increment();
            public abstract void Decrement();

        }
    }