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75 lines
2.3 KiB
75 lines
2.3 KiB
Imports Microsoft.VisualBasic.Parallel.Tasks
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Public Class ThreadTask(Of TOut)
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Dim taskList As Queue(Of Func(Of TOut))
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Dim threads As AsyncHandle(Of TOut)()
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Sub New(task As IEnumerable(Of Func(Of TOut)))
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Me.taskList = New Queue(Of Func(Of TOut))(task)
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End Sub
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Public Function WithDegreeOfParallelism(n_threads As Integer) As ThreadTask(Of TOut)
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threads = New AsyncHandle(Of TOut)(n_threads) {}
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Return Me
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End Function
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Private Function GetEmptyThread() As Integer
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For i As Integer = 0 To threads.Length - 1
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If threads(i) Is Nothing Then
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Return i
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End If
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Next
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Return -1
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End Function
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Private Function GetCompleteThread() As Integer
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For i As Integer = 0 To threads.Length - 1
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If (Not threads(i) Is Nothing) AndAlso threads(i).IsCompleted Then
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Return i
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End If
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Next
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Return -1
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End Function
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Public Overrides Function ToString() As String
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Dim free$ = threads.Where(Function(t) t Is Nothing).Count
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Dim running$ = threads.Where(Function(t) t IsNot Nothing AndAlso Not t.IsCompleted).Count
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Dim finished$ = threads.Where(Function(t) t IsNot Nothing AndAlso t.IsCompleted).Count
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Return $"[free: {free}, running: {running}, finished: {finished}]"
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End Function
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Public Iterator Function RunParallel() As IEnumerable(Of TOut)
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Do While taskList.Count > 0
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Dim i As Integer = GetEmptyThread()
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If i > -1 Then
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threads(i) = New AsyncHandle(Of TOut)(taskList.Dequeue).Run
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Call Console.WriteLine($"{ToString()} submit new task on thread [{i + 1}]!")
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End If
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Dim j As Integer = GetCompleteThread()
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If j > -1 Then
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Yield threads(j).GetValue
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threads(j) = Nothing
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Call Console.WriteLine($"{ToString()} [thread_{j + 1}] job done!")
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End If
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Loop
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Do While Not threads.All(Function(t) t Is Nothing)
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Dim j As Integer = GetCompleteThread()
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If j > -1 Then
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Yield threads(j).GetValue
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threads(j) = Nothing
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Call Console.WriteLine($"{ToString()} [thread_{j + 1}] job done!")
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End If
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Loop
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End Function
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End Class
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