using System;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
using Utils;

/**
 * 如何写个死循环，既不独占线程，又不阻塞UI线程
*/

namespace test
{
    public partial class Form1 : Form
    {
        private int _n = 0;
        private bool _run1 = false;
        private bool _run2 = false;
        private TaskSchedulerEx _task1 = new TaskSchedulerEx(2, 2); //只给2个线程

        public Form1()
        {
            InitializeComponent();
            ThreadPool.SetMaxThreads(12, 12); //最多给12个线程
            ThreadPool.SetMinThreads(10, 10);
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        /// <summary>
        /// 测试1
        /// 现象：会输出i=5，也会输出i=15，button3有事件响应，因为20个死循环，2个线程也能处理，只不过处理速度慢，加大线程池容量可加快处理速度
        /// </summary>
        private void button1_Click(object sender, EventArgs e)
        {
            _n = 0;
            button1.Enabled = false;
            button2.Enabled = true;
            _run1 = true;
            _run2 = false;
            textBox1.Text = string.Empty;
            for (int i = 1; i <= 20; i++) //启动20个死循环
            {
                _task1.Run(async (obj) => //用_task1(只给2个线程)启动20个死循环
                {
                    dynamic var = (dynamic)obj;

                    while (_run1) //此while不会独占线程
                    {
                        Task t = Task.Factory.StartNew(() =>
                        {
                            Thread.Sleep(100);
                            Interlocked.Increment(ref _n);

                            if (var.i == 5 || var.i == 15)
                            {
                                int a1; int a2; int m1; int m2;
                                ThreadPool.GetMaxThreads(out m1, out a1);
                                ThreadPool.GetAvailableThreads(out m2, out a2);
                                Log("当前使用辅助线程数：" + (m1 - m2) + "，当前使用异步线程数：" + (a1 - a2) + "，i=" + var.i + "，n=" + _n);
                            }
                        });
                        await t;
                    }
                }, new { i = i });
            }
        }

        /// <summary>
        /// 测试2 
        /// 现象：只输出i=5，不输出i=15，button3不能响应事件，因为有20个死循环，12个线程不够用，但因为12个线程比较多，所以处理速度较快
        /// </summary>
        private void button2_Click(object sender, EventArgs e)
        {
            _n = 0;
            button1.Enabled = true;
            button2.Enabled = false;
            _run1 = false;
            _run2 = true;
            textBox1.Text = string.Empty;
            for (int i = 1; i <= 20; i++) //启动20个死循环
            {
                Task.Factory.StartNew((obj) => //用Task(最多12个线程)启动20个死循环
                {
                    dynamic var = (dynamic)obj;

                    while (_run2) //此while会独占一个线程
                    {
                        Thread.Sleep(100);
                        Interlocked.Increment(ref _n);

                        if (var.i == 5 || var.i == 15)
                        {
                            int a1; int a2; int m1; int m2;
                            ThreadPool.GetMaxThreads(out m1, out a1);
                            ThreadPool.GetAvailableThreads(out m2, out a2);
                            Log("当前使用辅助线程数：" + (m1 - m2) + "，当前使用异步线程数：" + (a1 - a2) + "，i=" + var.i + "，n=" + _n);
                        }
                    }
                }, new { i = i });
            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
            Task.Factory.StartNew(() =>
            {
                Log("button3_Click 有响应"); //测试button3是否能响应事件
            });
        }
    }
}