LockCookie.cs

using System.Runtime.InteropServices;

namespace System.Threading
{
    [ComVisible(true)]
    public struct LockCookie
    {
        private int _dwFlags;

        private int _dwWriterSeqNum;

        private int _wReaderAndWriterLevel;

        private int _dwThreadID;

        public override int GetHashCode()
        {
            return _dwFlags + _dwWriterSeqNum + _wReaderAndWriterLevel + _dwThreadID;
        }

        public override bool Equals(object obj)
        {
            if (obj is LockCookie)
            {
                return Equals((LockCookie)obj);
            }
            return false;
        }

        public bool Equals(LockCookie obj)
        {
            if (obj._dwFlags == _dwFlags && obj._dwWriterSeqNum == _dwWriterSeqNum && obj._wReaderAndWriterLevel == _wReaderAndWriterLevel)
            {
                return obj._dwThreadID == _dwThreadID;
            }
            return false;
        }

        public static bool operator ==(LockCookie a, LockCookie b)
        {
            return a.Equals(b);
        }

        public static bool operator !=(LockCookie a, LockCookie b)
        {
            return !(a == b);
        }
    }
}