synclock

问题 is there a way in asp.net to make sure that a certain threaded sub is not run twice concurrently, no matter what? the code i have now is Public Class CheckClass ReadOnly Property CheckSessionsLock As Object Get If HttpRuntime.Cache("CheckSessionsLock") Is Nothing Then HttpRuntime.Cache("CheckSessionsLock") = New Object Return HttpRuntime.Cache("CheckSessionsLock") End Get End Property Sub TryThreads() Dim thread = New Thread(AddressOf TryLock) thread.Priority = ThreadPriority.Lowest thread

问题 I have a couple of buttons that users can click to load content with jQuery's $.ajax. All the buttons load the content into the same div tag. The problem is that if users click multiple times quickly, the content can flash several times before landing on the correct content. What workaround do I have for this? I was thinking of something similar to .net's SyncLock feature, but in javascript/jQuery. The ideal solution would be to cancel requests currently in the queue and start the new one.

问题 I have a class that contains a List(of T) used in a multithreaded application. I have three methods Get, Add and Remove where these access and modify the List(of T). I was using SyncLock to lock m_List any time I queried it for the desired object as well as when I added or removed objects. However I'm curious as to if there is a performance gain by simply locking m_List when I add an object or remove an object as opposed to when I'm searching for a desired object? Public Shared sub Add

问题 i have some test code which i run at every load of a page in my asp.net website this is the code Sub TryThreads() Dim t1 = New Thread(AddressOf TryLock) t1.Priority = ThreadPriority.Lowest t1.Start() Dim t2 = New Thread(AddressOf TryLock) t2.Priority = ThreadPriority.Lowest t2.Start() End Sub Sub TryLock() Dim LockObject = New Object SyncLock LockObject DoTrace("entered locker") For x = 0 To 10000 Next DoTrace("exiting locker") End SyncLock DoTrace("exited locker") End Sub the "dotrace"