标题是为了让其他遇到此错误的人能够轻松找到此内容。我是线程的新手,所以这真的让我很烦恼。我收到导致卡西尼号崩溃的运行时错误。这是我维护的代码,最初是在 VS 2003 中作为网站项目开发的,后来转换为 VS 2008 网站项目。
重要信息:
- 在本例中,
manualEvents
数组中的对象数量为 128。 products
是一个字符串数组- 需要支持.NET 2.0
For Each product As String In products
If Not product.Trim().ToUpper().EndsWith("OBSOLETE") Then
calls += 1
End If
Next
Dim results(calls - 1) As DownloadResults
'Dim manualEvents(calls - 1) As Threading.ManualResetEvent '128 objects in this case.
Dim manualEvents(0) As Threading.ManualResetEvent
manualEvents(0) = New Threading.ManualResetEvent(False)
'NOTE: I don't think this will work because what is not seen here, is that
' this code is being used to populate and cache a long list of products,
' each with their own category, etc. Am I misunderstanding something?
'initialize results structures
'spawn background workers
calls = 0
For Each product As String In products
If Not product.Trim().ToUpper().EndsWith("OBSOLETE") Then
Dim result As New DownloadResults
'manualEvents(calls) = New Threading.ManualResetEvent(False)
'Moved above For Each after declaration of variable
result.params.product = product
result.params.category = docType
'result.ManualEvent = manualEvents(calls)
result.ManualEvent = manualEvents(0)
result.Context = Me._context
results(calls) = result
Threading.ThreadPool.QueueUserWorkItem(AddressOf ProcessSingleCategoryProduct, results(calls))
Threading.Interlocked.Increment(calls) 'Replaces below incrementation
'calls += 1
End If
Next
Threading.WaitHandle.WaitAll(manualEvents) 'CRASHES HERE
线程辅助函数(为了完成)
Public Shared Sub ProcessSingleCategoryProduct(ByVal state As Object)
Dim drs As DownloadResults = CType(state, DownloadResults)
Dim adc As New cADCWebService(drs.Context)
drs.docs = adc.DownloadADC(drs.params.category, drs.params.product)
drs.ManualEvent.Set()
End Sub
最佳答案
您不需要包含 128 个手动事件的数组来检查所有 128 个线程是否完成。
仅创建一个手动重置事件和一个从 128 开始的普通整数。在 ProcessSingleCategoryProduct
末尾使用 Interlocked.Decrement
递减该整数,并且仅在以下情况下发出该事件信号:计数达到零:
if (Interlocked.Decrement(ByRef myCounter) = 0) myEvent.Set();
然后仅声明一个 Threading.ManualResetEvent
而不是它们的数组,并且您可以对其调用 WaitOne
而不是 WaitAll
,你就完成了。
如果您有 .NET 4,另请参阅 usr 的评论以获得更简单的替代方案。
关于vb.net - 线程异常: The number of WaitHandles must be less than or equal to 64,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10905016/