C# lock示例

这两天项目加了个需求，需要给PLC发心跳信号

我又不想在原来的循环中加，所以想着再弄个timer来定时发信号。

只是这样会有一个问题，就是冲突。

两个线程之间，有可能同时与plc发生通讯，引起数据混乱。

private void button1_Click(object sender, EventArgs e)
{
    Thread t1 = new Thread(() =>
    {
        for(int i = 0; i < 1000; i++)
        {
            runTask1("线程1");
        }
         
    });
    t1.Start();
 
    Thread t2 = new Thread(() =>
    {
        for (int i = 0; i < 1000; i++)
        {
            runTask2("线程2");
        }
    });
    t2.Start();
}
 
 
public static readonly object lockObj = new object();
 
 
public int mNum = 0;
public void runTask1(string msg)
{
    //Thread t1 = new Thread(()=> {
         
    //});
 
    lock (lockObj)
    {
        Console.WriteLine("任务1执行。。。"  + mNum.ToString() + "," + msg);
        Thread.Sleep(10);
        Console.WriteLine("任务1结束。。。"  + mNum.ToString() + "," + msg);
        Thread.Sleep(10);
        mNum++;
    }
 
}
 
 
//public int mNum = 0;
public void runTask2(string msg)
{
    //Thread t1 = new Thread(()=> {
 
    //});
 
    lock (lockObj)
    {
        Console.WriteLine("任务2执行。" + mNum.ToString() + "," + msg);
        Thread.Sleep(5);
        Console.WriteLine("任务2结束。" + mNum.ToString() + "," + msg);
        Thread.Sleep(8);
        mNum++;
    }
 
}
 
public void runTask3(string msg)
{
    //Thread t1 = new Thread(()=> {
 
    //});
 
    lock (lockObj)
    {
        Console.WriteLine("任务3执行。****" + mNum.ToString() + "," + msg);
        Thread.Sleep(5);
        Console.WriteLine("任务3结束。****" + mNum.ToString() + "," + msg);
        Thread.Sleep(8);
        mNum++;
    }
 
}
 
 
private void button2_Click(object sender, EventArgs e)
{
    if (timer1.Enabled)
    {
        timer1.Stop();
    }
    else
    {
        timer1.Start();
    }
     
}
 
private void timer1_Tick(object sender, EventArgs e)
{
    runTask3("时钟任务。");
}