[執行緒同步資源鎖定 lock / SyncLock 範例] #dotnet

ThreadLock.cs

// REF: [C#.NET][Thread] 執行緒同步資源鎖定 lock / SyncLock
// https://dotblogs.com.tw/yc421206/2011/01/07/20624

private static List<Thread> _threads = new List<Thread>();
private static object _thisLock = new object();

static void Main()
{
	for (int i = 0; i < 5; i++)
	{
		var t = new Thread(new ParameterizedThreadStart(DoWorker));
		t.Name = i.ToString();
		t.Start(i);
		_threads.Add(t);
	}
//	foreach (var item in _threads)
//	{
//		Console.WriteLine($"Thread[{item.ManagedThreadId}]: {item.ThreadState}");
//		Thread.Sleep(200);
//	}
	Console.WriteLine("Main thread exits.\n");
	Console.Read();
}

private static void DoWorker(object num)
{
	lock (_thisLock) {
		var thread = Thread.CurrentThread;
		Console.WriteLine($"No.{num}-Thread[{thread.ManagedThreadId}]: Enter DoWorker method, State:{thread.ThreadState}");
		Thread.Sleep(1000); // 模擬執行緒在這一個方法占用了很多時間
		// 不斷地觀察執行緒的生命週期
		foreach (var item in _threads)
		{
			Console.WriteLine($"Thread[{item.ManagedThreadId}]: {item.ThreadState}");
		}
	}
}