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。");
}
所以就 要使用lock
在某个线程和PLC通讯时，另一个线程不能使用。