[C#/TPL] Task 클래스 : 자식 태스크 실행하기

■ Task<T> 클래스를 사용해 자식 태스크를 실행하는 방법을 보여준다.

▶ 예제 코드 (C#)


using System;
using System.Threading;
using System.Threading.Tasks;

#region 값 구하기 - GetValue(taskName)

/// <summary>
/// 값 구하기
/// </summary>
/// <param name="taskName">태스크명</param>
/// <param name="waitTime">대기 시간</param>
/// <returns>값</returns>
private int GetValue(string taskName, int waitTime)
{
    Console.WriteLine
    (
        "태스크명 : {0}, 스레드 ID :{1}, 스레드 풀 사용 여부 : {2}",
        taskName,
        Thread.CurrentThread.ManagedThreadId,
        Thread.CurrentThread.IsThreadPoolThread
    );

    Thread.Sleep(waitTime);

    return DateTime.Now.Millisecond;
}

#endregion

Task<int> parentTask = new Task<int>
(
    () =>
    {
        Task childTask = Task.Factory.StartNew
        (
            () => GetValue("Child Task #1", 5000),
            TaskCreationOptions.AttachedToParent
        );

        childTask.ContinueWith
        (
            t => GetValue("Child Task #2", 2000),
            TaskContinuationOptions.AttachedToParent
        );

        return GetValue("Parent Task", 2000);
    }
);

parentTask.Start();

while(!parentTask.IsCompleted)
{
    Console.WriteLine(parentTask.Status);

    Thread.Sleep(500);
}

Console.WriteLine(parentTask.Status);

int value = parentTask.Result;

Console.WriteLine("반환값 : {0}", value);

Thread.Sleep(10000);

using System;

using System.Threading;

using System.Threading.Tasks;

#region 값 구하기 - GetValue(taskName)

/// <summary>

/// 값 구하기

/// </summary>

/// <param name="taskName">태스크명</param>

/// <param name="waitTime">대기 시간</param>

/// <returns>값</returns>

private int GetValue(string taskName, int waitTime)

{

Console.WriteLine

(

"태스크명 : {0}, 스레드 ID :{1}, 스레드 풀 사용 여부 : {2}",

taskName,

Thread.CurrentThread.ManagedThreadId,

Thread.CurrentThread.IsThreadPoolThread

);

Thread.Sleep(waitTime);

return DateTime.Now.Millisecond;

}

#endregion

Task<int> parentTask = new Task<int>

(

() =>

{

Task childTask = Task.Factory.StartNew

(

() => GetValue("Child Task #1", 5000),

TaskCreationOptions.AttachedToParent

);

childTask.ContinueWith

(

t => GetValue("Child Task #2", 2000),

TaskContinuationOptions.AttachedToParent

);

return GetValue("Parent Task", 2000);

}

);

parentTask.Start();

while(!parentTask.IsCompleted)

{

Console.WriteLine(parentTask.Status);

Thread.Sleep(500);

}

Console.WriteLine(parentTask.Status);

int value = parentTask.Result;

Console.WriteLine("반환값 : {0}", value);

Thread.Sleep(10000);