lightlock.cs

破解的飞信源代码

namespace NCindy.Util
{
    using System;
    using System.Threading;

    public sealed class LightLock : IDisposable
    {
        private bool isDisposed = false;
        private const int LockIsFree = 0;
        private const int LockIsOwned = 1;
        private int lockState;
        private readonly Semaphore waiterLock = new Semaphore(0, 0x7fffffff);
        private const int WaitersCountBase = 2;

        private void CheckDisposed()
        {
            if (this.isDisposed)
            {
                throw new ObjectDisposedException(null);
            }
        }

        public void Dispose()
        {
            this.CheckDisposed();
            try
            {
                this.waiterLock.Close();
            }
            finally
            {
                this.isDisposed = true;
            }
        }

        public void Enter()
        {
            this.Enter(-1);
        }

        public void Enter(int timeout)
        {
            this.CheckDisposed();
            Thread.BeginCriticalRegion();
            while (true)
            {
                int ifThisEqualsToValue = InterlockedHelper.Or(ref this.lockState, 1);
                if ((ifThisEqualsToValue & 1) == 0)
                {
                    return;
                }
                if (InterlockedHelper.CompareAndExchange(ref this.lockState, ifThisEqualsToValue, ifThisEqualsToValue + 2))
                {
                    this.waiterLock.WaitOne(timeout, false);
                }
            }
        }

        public void Exit()
        {
            this.CheckDisposed();
            int num = InterlockedHelper.And(ref this.lockState, -2);
            if (num != 1)
            {
                num &= -2;
                if (InterlockedHelper.CompareAndExchange(ref this.lockState, num & -2, num - 2))
                {
                    this.waiterLock.Release(1);
                }
            }
            Thread.EndCriticalRegion();
        }
    }
}