net qr code reader open source Working with Threads in Visual Studio .NET

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Working with Threads
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To manipulate a Windows thread, you need a reference to the corresponding Thread object. This can be a reference to a new thread or a reference to the current thread that is, the thread that is running the code which you get by using the
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12:
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Threading
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Thread.CurrentThread shared method. Once you have a reference to a Thread object, you can start, suspend, resume, or abort it using methods of the Thread class. As I explained earlier, a thread naturally terminates when it reaches the Exit or End statement of its main procedure, but it also can be suspended or aborted by another thread (or by itself) by means of a Suspend or Abort method. Like the Start method, the Suspend and Abort methods are asynchronous in the sense that they don t suspend or abort the thread immediately (unless you call the method for the current thread). In fact, threads can be suspended or aborted only when they reach a safe point. In gen eral, a safe point is a point in time when it s safe to perform a garbage collection for example, when a method call returns. The runtime has several ways to take control when a thread reaches a safe point for a garbage collection. It can, for example, hijack the thread: when the thread is making a call to a class in the framework, the runtime pushes an extra return address (which points to a location in the runtime itself) onto the call stack. Then, when the method call completes, the runtime can take control and decide whether it s time to perform a garbage collection, to suspend the thread, or to abort it if there s a pending Abort method. There s another reason the Abort method doesn t immediately halt a thread. Instead of killing the thread immediately as is the case with the ExitThread and TerminateThread Windows API functions the Abort method causes a ThreadAbortException to be thrown in the target thread. This exception is special in that managed code can t catch it. However, if the target thread is executing inside a Try End Try block, the code in the Finally clause is guaranteed to be executed and the thread is aborted only at the completion of the Finally clause. A thread might even detect that it s being aborted (by means of the ThreadState property, described in the next section) and might continue to run code in the Finally clause to postpone its death. (Trusted code can also cancel an Abort method using the ResetAbort method see the MSDN documentation for additional details.) The Suspend and Resume instance methods let you temporarily suspend and then resume a thread. (A thread can suspend itself, but obviously it can t resume itself from a suspended state.) As for Abort, a thread is actually suspended only when it can be suspended safely, even though the Suspend method never blocks the caller (unless the calling thread is suspending itself, of course). The Suspend method has no effect on threads that are already suspended, and the Resume method has no effect on threads that are running. However, calls to the Suspend and Resume methods must be bal anced. In addition, both methods throw a ThreadStateException if the target thread hasn t started yet or is already dead, or they throw a SecurityException if the caller doesn t have the necessary security permissions:
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Define and start a new thread.
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(Note that you don t strictly need a New ThreadStart object explicitly
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because the AddressOf operator returns a delegate.)
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Dim t As New Thread(AddressOf DoTheTask)
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Part III:
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Programming the .NET Framework
t.Start Suspend the thread. t.Suspend Resume the thread. t.Resume Abort the thread. t.Abort
A thread can suspend itself temporarily by using the Thread.Sleep shared method, which takes a timeout in milliseconds:
Pause for half a second. Thread.Sleep(500)
The Sleep method works only on the current thread. Using this method is similar to calling the Windows API Sleep function. You can use the special 0 timeout value to ter minate the current time slice and relinquish control to the thread scheduler, or you can use the Timeout.Infinite value (-1) to suspend the current thread indefinitely until another thread wakes it up. You can also pass a TimeSpan object to specify the length of the timeout. It s quite common to wait for a thread to terminate; for example, the main thread can start a worker thread and then continue to execute to the point at which it must ensure that the worker thread has completed its task. You can use the Join method to easily achieve this behavior, as you can see in the following snippet:
Dim t As New Thread(AddressOf DoTheTask)
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