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Threading
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method s overload that takes a single object parameter. The following code snippet provides an example:
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' VB ParameterizedThreadStart operation = _ New ParameterizedThreadStart(WorkWithParameter) ' Creates, but does not start, a new thread Dim theThread As Thread = New Thread(operation) ' Starts the work on a new thread theThread.Start("Hello") ' A Second Thread with a different parameter Dim NewThread As New Thread(operation) NewThread.Start("Goodbye") // C# ParameterizedThreadStart operation = new ParameterizedThreadStart(WorkWithParameter); // Creates, but does not start, a new thread Thread theThread = new Thread(operation); // Starts the work on a new thread theThread.Start("Hello"); // A Second Thread with a different parameter Thread newThread = new Thread(operation); newThread.Start("Goodbye");
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Be aware that because the WorkWithParameter method takes an object, Thread.Start could be called with any object instead of the string it expects. Being careful in choosing your starting method for a thread to deal with unknown types is crucial to good threading code. Instead of blindly casting the method parameter into our string, it is a better practice to test the type of the object, as shown in the following example:
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' VB Dim info As String = o as String
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If info Is Nothing Then Throw InvalidProgramException("Parameter for thread must be a string") End If // C# string info = o as string; if (info == null) { throw InvalidProgramException("Parameter for thread must be a string"); }
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Lesson 1: Creating Threads
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Stopping Threads
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Controlling threads in your applications often requires that you be able to stop threads. The primary mechanism for stopping threads is to use the Thread.Abort method. When the Thread.Abort method is called, the threading system prepares to throw a ThreadAbortException in the thread. Whether the exception is caught or not, the thread is stopped after it is thrown. The following code snippet provides an example:
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' VB Dim NewThread As Thread = New Thread(New ThreadStart(AbortThisThread)) NewThread.Start() NewThread.Abort() Shared Sub AbortThisThread() ' Setting data SomeClass.IsValid = True SomeClass.IsComplete = True ' Write the object to the console SomeClass.WriteToConsole() End Sub // C# Thread newThread = new Thread(new ThreadStart(AbortThisThread)); newThread.Start(); newThread.Abort(); static void AbortThisThread() { // Setting data SomeClass.IsValid = true; SomeClass.IsComplete = true; // Write the object to the console SomeClass.WriteToConsole(); }
Because the AbortThisThread method never catches the ThreadAbortException, this thread stops at the line currently executing when the main thread calls Abort to kill the thread. This is a problem because the thread system doesn t know where it can safely kill the thread. Aborting the thread in the wrong place in the code could leave data in an inconsistent state. For example, if the ThreadAbortException is thrown between the setting of the IsValid and IsComplete properties, the SomeClass object might be left in an inconsistent state. If the ThreadAbortException is thrown after the code writes the properties but before the code calls the WriteToConsole method, our object will be consistent. It will just never write itself out to the console.
7
Threading
To solve the problem of leaving objects or the AppDomain in an inconsistent domain, the Thread class has two important static methods: BeginCriticalRegion and EndCriticalRegion. We can add calls to these methods to tell the threading system that it can abort this thread, just not within this critical region. The following code snippet provides an example:
' VB Shared Sub AbortThisThread() ' Setting data Thread.BeginCriticalRegion() SomeClass.IsValid = True SomeClass.IsComplete = True Thread.EndCriticalRegion() ' Write the object to the console SomeClass.WriteToConsole() End Sub // C# static void AbortThisThread() { // Setting data Thread.BeginCriticalRegion(); SomeClass.IsValid = true; SomeClass.IsComplete = true; Thread.EndCriticalRegion(); // Write the object to the console SomeClass.WriteToConsole(); }
The idea behind a critical region is to provide a region of code that must be executed as if it were a single line. Any attempt to abort a thread while it is within a critical region will have to wait until after the critical region is complete. At that point, the thread will be aborted, throwing the ThreadAbortException. The difference between a thread with and without a critical region is illustrated in Figure 7-1.
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