📚Task

Task 클래스 - C# 프로그래밍 배우기 (Learn C# Programming)

Task 클래스 (System.Threading.Tasks)docsmsft

Using Task

static void Main()
{
    Action<object> action = (object obj) =>
    {
        Console.WriteLine("Task={0}, obj={1}, Thread={2}",
            Task.CurrentId,
            obj,
            Thread.CurrentThread.ManagedThreadId);
    };

    Action<object> action1 = (object obj) =>
    {
        int[] abc = obj as int[];
        Console.WriteLine("{0}, {1}, {2}", abc[0], abc[1], abc[2]);
        Console.WriteLine("Task={0}, obj={1}, Thread={2}",
            Task.CurrentId,
            abc,
            Thread.CurrentThread.ManagedThreadId);
    };

    // Create a task but do not start it.
    Task t1 = new Task(action, "alpha");

    // Construct a started task
    int[] asdf = { 1, 2, 3 };
    //Task t2 = Task.Factory.StartNew(action, asdf);
    //Task t2 = Task.Factory.StartNew(action, new int[3] { 1, 2, 3 });
    Task t2 = Task.Factory.StartNew(action1, new int[] { 1, 2, 3 });
    //Task t2 = Task.Factory.StartNew(action, "beta");
    // Block the main thread to demonstrate that t2 is executing
    t2.Wait(3000);

    Task aa = new Task((object a) =>
    {
        int[] abc = a as int[];
        Console.WriteLine("{0}, {1}", abc[0], abc[1]);

    }, new int[] {1,2});
    aa.Start();

    // Launch t1 
    t1.Wait(2000);
    t1.Start();
    Console.WriteLine("t1 has been launched. (Main Thread={0})",
        Thread.CurrentThread.ManagedThreadId);
    // Wait for the task to finish.
    t1.Wait();

    // Construct a started task using Task.Run.
    String taskData = "delta";
    Task t3 = Task.Run(() =>
    {
        Console.WriteLine("Task={0}, obj={1}, Thread={2}",
            Task.CurrentId, taskData,
            Thread.CurrentThread.ManagedThreadId);
    });
    // Wait for the task to finish.
    t3.Wait();

    // Construct an unstarted task
    Task t4 = new Task(action, "gamma");
    // Run it synchronously
    t4.RunSynchronously();
    // Although the task was run synchronously, it is a good practice
    // to wait for it in the event exceptions were thrown by the task.
    t4.Wait();
}

Task.Start()

• 등록된 task start

Task.Wait()

Task.Wait 메서드 (System.Threading.Tasks)docsmsft

• 파라미터는 millisec value int 이며

• start() 하지 않고 매개변수없는 wait() 이라면 무한대기

• start() 한 뒤, wait()는 task가 끝날때까지 대기

• wait(1000) 값이 있다면, 해당 시간만큼 대

Task.Factory.StartNew(Action, object)

Task.Wait 메서드 (System.Threading.Tasks)docsmsft

• 즉 시 실 행

Task.Start() 후 Task.Wait() 안해주면?

static void Main()
{
    Action<object> action = (object obj) =>
    {
        Console.WriteLine("Task={0}, obj={1}, Thread={2}",
            Task.CurrentId,
            obj,
            Thread.CurrentThread.ManagedThreadId);
    };

    Action<object> action1 = (object obj) =>
    {
        int[] abc = obj as int[];
        Console.WriteLine("Task={0}, obj={1}, Thread={2}",
            Task.CurrentId,
            abc,
            Thread.CurrentThread.ManagedThreadId);
    };

    // Create a task but do not start it.
    Task t1 = new Task(action, "alpha");

    // Construct a started task
    int[] asdf = { 1, 2, 3 };
    //Task t2 = Task.Factory.StartNew(action, asdf);
    //Task t2 = Task.Factory.StartNew(action, new int[3] { 1, 2, 3 });
    Task t2 = Task.Factory.StartNew(action1, new int[] { 1, 2, 3 });
    //Task t2 = Task.Factory.StartNew(action, "beta");
    // Block the main thread to demonstrate that t2 is executing
    t2.Wait(3000);

    Task aa = new Task((object a) =>
    {
        int[] abc = a as int[];
        Console.WriteLine("{0}, {1}", abc[0], abc[1]);

    }, new int[] {1,2});
    aa.Start();

    // Launch t1 
    t1.Wait(2000);
    t1.Start();
    Console.WriteLine("t1 has been launched. (Main Thread={0})",
        Thread.CurrentThread.ManagedThreadId);
    // Wait for the task to finish.
    //t1.Wait();

    // Construct a started task using Task.Run.
    String taskData = "delta";
    Task t3 = Task.Run(() =>
    {
        Console.WriteLine("Task={0}, obj={1}, Thread={2}",
            Task.CurrentId, taskData,
            Thread.CurrentThread.ManagedThreadId);
    });
    // Wait for the task to finish.
    //t3.Wait();

    // Construct an unstarted task
    Task t4 = new Task(action, "gamma");
    // Run it synchronously
    t4.RunSynchronously();
    // Although the task was run synchronously, it is a good practice
    // to wait for it in the event exceptions were thrown by the task.
    t4.Wait();
}

• 원하는 시퀀스대로 나오지 않을 수 있다.