Lab_5/15var (IV semester) OS&SP

//SystemEvent.cs
using System;
using System.Runtime.InteropServices;

namespace Lab5
{
    public class SystemEvent
    {
        private string eventName;
        private IntPtr handle;
        private IntPtr attributes = IntPtr.Zero;
        private bool manualReset;
        private bool initialState;

        [DllImport("kernel32.dll")]
        static extern IntPtr CreateEvent(IntPtr lpEventAttributes, bool bManualReset,
            bool bInitialState, string lpName);

        [DllImport("kernel32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        static extern bool CloseHandle(IntPtr hObject);

        [DllImport("kernel32.dll")]
        static extern bool SetEvent(IntPtr hEvent);


        [DllImport("kernel32.dll")]
        static extern bool ResetEvent(IntPtr hEvent);

        [DllImport("kernel32", SetLastError = true, ExactSpelling = true)]
        internal static extern Int32 WaitForSingleObject(IntPtr handle, Int32 milliseconds);


        public SystemEvent(string EventName) : this(EventName, false) { }

        public SystemEvent(string EventName, bool ManualReset)
        {
            eventName = EventName;
            manualReset = ManualReset;
            initialState = false;

            handle = CreateEvent(attributes, manualReset, initialState, eventName);
        }


        public bool Wait(int milliseconds)
        {
            return WaitForSingleObject(handle, milliseconds) == 0;
        }


        public void Set()
        {
            initialState = true;
            handle = CreateEvent(attributes, manualReset, initialState, eventName);
            SetEvent(handle);
            CloseHandle(handle);
        }


        public void Reset()
        {
            initialState = false;
            handle = CreateEvent(attributes, manualReset, initialState, eventName);
            ResetEvent(handle);
        }
    }
}

//Sender
using System.Windows.Forms;
namespace Lab5
{
    public partial class Lab_5_sender : Form
    {
        public static Lab_5_sender Instance { get; private set; }
        SystemEvent OnMouseWheel = new SystemEvent("OnMouseWheel", true);

        public Lab_5_sender()
        {
            if (Instance == null)
                Instance = this;
            InitializeComponent();
            textBox1.Text = "1\r\n2\r\n3\r\n4\r\n5\r\n6\r\n7\r\n8\r\n9\r\n10\r\n";
            textBox1.MouseWheel += textBox1_MouseWheel;
        }
        private void textBox1_MouseWheel(object sender, MouseEventArgs e)
        {
            OnMouseWheel.Set();
        }
    }
}

//Receive
using System;
using System.Windows.Forms;
using System.Threading.Tasks;

namespace Lab5
{
    public partial class Lab_5_receive : Form
    {
        SystemEvent OnMouseWheelEvent = new SystemEvent("OnMouseWheel");
        public Lab_5_receive()
        {
            InitializeComponent();
            new Lab_5_sender().Show();
            WaitForEvent();
        }

        private async void WaitForEvent()
        {
            while (true)
            {
                await Task.Delay(10);
                if (OnMouseWheelEvent.Wait(10))
                {
                    textBox1.AppendText(DateTime.Now + ": " + "OnMouseWheel\r\n");
                    OnMouseWheelEvent.Reset();
                }
            }
        }
    }
}