How to realize thread synchronization in VB.NET

This article mainly introduces VB.NET how to achieve thread synchronization, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

VB.NET thread synchronization

In terms of VB.NET thread synchronization, VB.NET provides several methods. In the square example above, you want to synchronize with the VB.NET thread that executes the calculation in order to wait for it to finish execution and get the result. Another example is that if you sort an array in another thread, you must wait for the processing to complete before using the array. In order to make these synchronizations, VB.NET provides SyncLock declarations and Thread.Join methods.

SyncLock can get a lock for an object reference, as long as the object is passed to SyncLock. By getting this lock, you can ensure that multiple threads do not access shared data or code executed on multiple threads. To get a lock, you can use a more convenient object-the System.Type object associated with each class. The System.Type object can be obtained by using the GetType method:

Public Sub CalcSquare () SyncLock GetType (SquareClass) Square = Value * Value End SyncLock End Sub

The other is the Thread.Join method, which allows you to wait for a specific time until a thread finishes. If the thread finishes before the time you specify, Thread.Join will return True, otherwise it will return False. In the square example, if you do not want to use the method that triggers the event, you can call the method of Thread.Join to determine whether the calculation is complete. The code is as follows:

Private Sub Button1_Click (ByVal sender As System.Object

_ ByVal e As System.EventArgs) Handles Button1.Click

Dim oSquare As New SquareClass ()

T = New Thread (AddressOf oSquare.CalcSquare)

OSquare.Value = 30

T.Start ()

If t.Join (500) Then

MsgBox (oSquare.Square)

End If

End Sub

For this approach, note that the process of handling the event, in this case SquareEventHandler, will run in the thread that generated the event. It is not running in the thread of table execution.

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