1，锁：控制多线程并发操作时，线程安全问题。
举例：
static bool done; //线程是否完成标识
static object locker = new object(); //线程锁
static void Main(string[] args)
{
Thread thread = new Thread(Test); // 打开多线程运行Test（）
thread.Start();
thread.Name = "thread";
Test(); // 主线程运行Test（）
Console.ReadKey();
}
static void Test()
{
lock (locker)
{
if (!done)
{
Thread.Sleep(500); // Doing something.
Console.WriteLine("Done. Thread name:" + Thread.CurrentThread.Name);
done = true;
}
}
}
结果：Done. Thread name:thread
上例中有主副两个线程，理论上来讲主线程和副线程不分先后都有可能调用Test方法，实际情况是副现场调用先调用Test方法，进程锁定，主进程无法调用。
2，ManualResetEvent实现进程信号机制
static object locker = new object();
static ManualResetEvent signal = new ManualResetEvent(false);
static void Main(string[] args)
{
Thread thread = new Thread(Go);
thread.Start();
bool runThread = true;
while (runThread)
{
string input = Console.ReadLine();
if (input.Trim().ToLower() == "stop")
{
Console.WriteLine("线程已停止运行...");
signal.Reset();
}
else if (input.Trim().ToLower() == "run")
{
Console.WriteLine("线程开启运行...");
signal.Set();
}
else if (input.Trim().ToLower() == "exit")
{
runThread = false;
}
}
}
static void Go()
{
lock (locker)
{
while (true)
{
Console.WriteLine("Waiting for signal...");
signal.WaitOne();
Console.WriteLine("Got signal!");
Thread.Sleep(5000);
}
}
}
当输入stop时进行暂停等待信号，输入run获得进行信号开始运行。