本文整理汇总了VB.NET中System.Threading.Barrier类的典型用法代码示例。如果您正苦于以下问题：VB.NET Barrier类的具体用法？VB.NET Barrier怎么用？VB.NET Barrier使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
在下文中一共展示了Barrier类的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的VB.NET代码示例。
示例1: BarrierSample
' 导入命名空间
Imports System.Threading
Imports System.Threading.Tasks
Module BarrierSample
' Demonstrates:
' Barrier constructor with post-phase action
' Barrier.AddParticipants()
' Barrier.RemoveParticipant()
' Barrier.SignalAndWait(), incl. a BarrierPostPhaseException being thrown
Sub Main()
Dim count As Integer = 0
' Create a barrier with three participants
' Provide a post-phase action that will print out certain information
' And the third time through, it will throw an exception
Dim barrier As New Barrier(3,
Sub(b)
Console.WriteLine("Post-Phase action: count={0}, phase={1}", count, b.CurrentPhaseNumber)
If b.CurrentPhaseNumber = 2 Then
Throw New Exception("D'oh!")
End If
End Sub)
' Nope -- changed my mind. Let's make it five participants.
barrier.AddParticipants(2)
' Nope -- let's settle on four participants.
barrier.RemoveParticipant()
' This is the logic run by all participants
Dim action As Action =
Sub()
Interlocked.Increment(count)
barrier.SignalAndWait()
' during the post-phase action, count should be 4 and phase should be 0
Interlocked.Increment(count)
barrier.SignalAndWait()
' during the post-phase action, count should be 8 and phase should be 1
' The third time, SignalAndWait() will throw an exception and all participants will see it
Interlocked.Increment(count)
Try
barrier.SignalAndWait()
Catch bppe As BarrierPostPhaseException
Console.WriteLine("Caught BarrierPostPhaseException: {0}", bppe.Message)
End Try
' The fourth time should be hunky-dory
Interlocked.Increment(count)
' during the post-phase action, count should be 16 and phase should be 3
barrier.SignalAndWait()
End Sub
' Now launch 4 parallel actions to serve as 4 participants
Parallel.Invoke(action, action, action, action)
' This (5 participants) would cause an exception:
' Parallel.Invoke(action, action, action, action, action)
' "System.InvalidOperationException: The number of threads using the barrier
' exceeded the total number of registered participants."
' It's good form to Dispose() a barrier when you're done with it.
barrier.Dispose()
End Sub
End Module