以下是窗体的按钮代码：
Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        myth()
    End Sub
End Class
以下是模块的代码：
Module Module1
    Dim t1 As Threading.Thread
    Dim t2 As Threading.Thread
    Dim a As Integer, b As Integer
    Sub myth()
        t1 = New Threading.Thread(AddressOf setA)
        t1.Start()
        t2 = New Threading.Thread(AddressOf setB)
        t2.Start()
        MessageBox.Show("a=" & a & ",b=" & b)
    End Sub
    Private Sub setA()
        a = 1
    End Sub
    Private Sub setB()
        b = 2
    End Sub
End Module
请在过程myth中做线程池的代码而取代以下过程myth中的代码：
        t1 = New Threading.Thread(AddressOf setA)
        t1.Start()
        t2 = New Threading.Thread(AddressOf setB)
        t2.Start()