本文整理汇总了VB.NET中System.Threading.SemaphoreSlim类的典型用法代码示例。如果您正苦于以下问题：VB.NET SemaphoreSlim类的具体用法？VB.NET SemaphoreSlim怎么用？VB.NET SemaphoreSlim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SemaphoreSlim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: Example
' 导入命名空间
Imports System.Threading
Imports System.Threading.Tasks
Module Example
Private semaphore As SemaphoreSlim
' A padding interval to make the output more orderly.
Private padding As Integer
Public Sub Main()
' Create the semaphore.
semaphore = New SemaphoreSlim(0, 3)
Console.WriteLine("{0} tasks can enter the semaphore.",
semaphore.CurrentCount)
Dim tasks(4) As Task
' Create and start five numbered tasks.
For i As Integer = 0 To 4
tasks(i) = Task.Run(
Sub()
' Each task begins by requesting the semaphore.
Console.WriteLine("Task {0} begins and waits for the semaphore.",
Task.CurrentId)
semaphore.Wait()
Interlocked.Add(padding, 100)
Console.WriteLine("Task {0} enters the semaphore.", Task.CurrentId)
' The task just sleeps for 1+ seconds.
Thread.Sleep(1000 + padding)
Console.WriteLine("Task {0} releases the semaphore previous count: {1}.",
Task.CurrentId, semaphore.Release())
End Sub )
Next
' Wait for half a second, to allow all the tasks to start and block.
Thread.Sleep(500)
' Restore the semaphore count to its maximum value.
Console.Write("Main thread calls Release(3) --> ")
semaphore.Release(3)
Console.WriteLine("{0} tasks can enter the semaphore.",
semaphore.CurrentCount)
' Main thread waits for the tasks to complete.
Task.WaitAll(tasks)
Console.WriteLine("Main thread exits.")
End Sub
End Module输出：
0 tasks can enter the semaphore. Task 1 begins and waits for the semaphore. Task 5 begins and waits for the semaphore. Task 2 begins and waits for the semaphore. Task 4 begins and waits for the semaphore. Task 3 begins and waits for the semaphore. Main thread calls Release(3) --> 3 tasks can enter the semaphore. Task 4 enters the semaphore. Task 1 enters the semaphore. Task 3 enters the semaphore. Task 4 releases the semaphore; previous count: 0. Task 2 enters the semaphore. Task 1 releases the semaphore; previous count: 0. Task 3 releases the semaphore; previous count: 0. Task 5 enters the semaphore. Task 2 releases the semaphore; previous count: 1. Task 5 releases the semaphore; previous count: 2. Main thread exits.