Thread.IsThreadPoolThread Property

Gets a value indicating whether or not a thread belongs to the managed thread pool.

[Visual Basic]
Public ReadOnly Property IsThreadPoolThread As Boolean
[C#]
public bool IsThreadPoolThread {get;}
[C++]
public: __property bool get_IsThreadPoolThread();
[JScript]
public function get IsThreadPoolThread() : Boolean;

Property Value

true if this thread belongs to the managed thread pool; otherwise, false.

Example

[Visual Basic, C#, C++] The following code example shows how to determine whether a thread is from the thread pool.

[Visual Basic] 
Option Explicit
Option Strict

Imports System
Imports System.Threading

Public Class IsThreadPool

    Shared Sub Main()
        Dim autoEvent As New AutoResetEvent(False)

        Dim regularThread As New Thread(AddressOf ThreadMethod)
        regularThread.Start()
        ThreadPool.QueueUserWorkItem(AddressOf WorkMethod, autoEvent)

        ' Wait for foreground thread to end.
        regularThread.Join()

        ' Wait for background thread to end.
        autoEvent.WaitOne()
    End Sub

    Shared Sub ThreadMethod()
        Console.WriteLine("ThreadOne, executing ThreadMethod, " & _
            "is from the thread pool? {0}", _
            Thread.CurrentThread.IsThreadPoolThread)
    End Sub

    Shared Sub WorkMethod(stateInfo As Object)
        Console.WriteLine("ThreadTwo, executing WorkMethod, " & _
            "is from the thread pool? {0}", _
            Thread.CurrentThread.IsThreadPoolThread)

        ' Signal that this thread is finished.
        DirectCast(stateInfo, AutoResetEvent).Set()
    End Sub

End Class

[C#] 
using System;
using System.Threading;

class IsThreadPool
{
    static void Main()
    {
        AutoResetEvent autoEvent = new AutoResetEvent(false);

        Thread regularThread = 
            new Thread(new ThreadStart(ThreadMethod));
        regularThread.Start();
        ThreadPool.QueueUserWorkItem(new WaitCallback(WorkMethod), 
            autoEvent);

        // Wait for foreground thread to end.
        regularThread.Join();

        // Wait for background thread to end.
        autoEvent.WaitOne();
    }

    static void ThreadMethod()
    {
        Console.WriteLine("ThreadOne, executing ThreadMethod, " +
            "is {0}from the thread pool.", 
            Thread.CurrentThread.IsThreadPoolThread ? "" : "not ");
    }

    static void WorkMethod(object stateInfo)
    {
        Console.WriteLine("ThreadTwo, executing WorkMethod, " +
            "is {0}from the thread pool.", 
            Thread.CurrentThread.IsThreadPoolThread ? "" : "not ");

        // Signal that this thread is finished.
        ((AutoResetEvent)stateInfo).Set();
    }
}

[C++] 
#using <mscorlib.dll>

using namespace System;
using namespace System::Threading;

__gc class IsThreadPool
{
public:
    static void ThreadMethod()
    {
        Console::WriteLine(S"ThreadOne, executing ThreadMethod, "
            S"is {0}from the thread pool.", 
            Thread::CurrentThread->IsThreadPoolThread ? S"" : S"not ");
    }

    static void WorkMethod(Object* stateInfo)
    {
        Console::WriteLine(S"ThreadTwo, executing WorkMethod, "
            S"is {0}from the thread pool.", 
            Thread::CurrentThread->IsThreadPoolThread ? S"" : S"not ");

        // Signal that this thread is finished.
        dynamic_cast<AutoResetEvent*>(stateInfo)->Set();
    }
};

void main()
{
    AutoResetEvent* autoEvent = new AutoResetEvent(false);

    Thread* regularThread = 
        new Thread(new ThreadStart(0, &IsThreadPool::ThreadMethod));
    regularThread->Start();
    ThreadPool::QueueUserWorkItem(new WaitCallback(0, 
        &IsThreadPool::WorkMethod), autoEvent);

    // Wait for foreground thread to end.
    regularThread->Join();

    // Wait for background thread to end.
    autoEvent->WaitOne();
}

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button in the upper-left corner of the page.

Requirements

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also

Thread Class | Thread Members | System.Threading Namespace