本文整理汇总了VB.NET中System.Threading.ReaderWriterLock.DowngradeFromWriterLock方法的典型用法代码示例。如果您正苦于以下问题：VB.NET ReaderWriterLock.DowngradeFromWriterLock方法的具体用法？VB.NET ReaderWriterLock.DowngradeFromWriterLock怎么用？VB.NET ReaderWriterLock.DowngradeFromWriterLock使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Threading.ReaderWriterLock的用法示例。
在下文中一共展示了ReaderWriterLock.DowngradeFromWriterLock方法的2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: ReaderWriterLock
' The complete code is located in the ReaderWriterLock class topic.
Imports System.Threading
Public Module Example
Private rwl As New ReaderWriterLock()
' Define the shared resource protected by the ReaderWriterLock.
Private resource As Integer = 0示例2: UpgradeDowngrade
' Requests a reader lock, upgrades the reader lock to the writer
' lock, and downgrades it to a reader lock again.
Sub UpgradeDowngrade(timeOut As Integer)
Try
rwl.AcquireReaderLock(timeOut)
Try
' It's safe for this thread to read from the shared resource.
Display("reads resource value " & resource)
Interlocked.Increment(reads)
' To write to the resource, either release the reader lock and
' request the writer lock, or upgrade the reader lock. Upgrading
' the reader lock puts the thread in the write queue, behind any
' other threads that might be waiting for the writer lock.
Try
Dim lc As LockCookie = rwl.UpgradeToWriterLock(timeOut)
Try
' It's safe for this thread to read or write from the shared resource.
resource = rnd.Next(500)
Display("writes resource value " & resource)
Interlocked.Increment(writes)
Finally
' Ensure that the lock is released.
rwl.DowngradeFromWriterLock(lc)
End Try
Catch ex As ApplicationException
' The upgrade request timed out.
Interlocked.Increment(writerTimeouts)
End Try
' If the lock was downgraded, it's still safe to read from the resource.
Display("reads resource value " & resource)
Interlocked.Increment(reads)
Finally
' Ensure that the lock is released.
rwl.ReleaseReaderLock()
End Try
Catch ex As ApplicationException
' The reader lock request timed out.
Interlocked.Increment(readerTimeouts)
End Try
End Sub