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THE AUTORESETEVENT CLASS
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AutoResetEvent is a form of thread synchronization that alternates between a signaled state and an unsignaled one. Think of it as acting much like the toll turnstile at the subway station. To get past the turnstile someone must first deposit the correct fare. Once the fare has been deposited, only one person may enter. The turnstile switches from the state where it allows the person to enter to the state where it does not as soon as one person has entered. In this analogy, the turnstile is in a signaled state once someone deposits the fare. It switches to the unsignaled state as soon as someone passes through the turnstile.
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AutoResetEvent is a class that is derived from WaitHandle. It is a thread synchronization mechanism that is in one of two states. When it is signaled, any thread that calls, or has called, WaitOne will be allowed to proceed, automatically resetting the class to the unsignaled state.
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The AutoResetEvent class contains the Set and Reset methods. Invoking Set results in the instance of the AutoResetEvent class becoming signaled. Invoking Reset can be used to change the instance of the AutoResetEvent class to unsignaled. 8.2.1 Using the Set method AutoResetEvent.Set is the method to insert the token, so to speak. Set ensures that the state of the instance of the AutoResetEvent is signaled. If the state is signaled before Set is called, it will remain signaled. This toll turnstile does not give change. If more than one call to Set is made, the result will be the same: exactly one thread will be allowed to pass. Set is a method of AutoResetEvent that changes the state of an instance Set of that class to signaled. If the instance of AutoResetEvent is already signaled, the method has no effect. 145
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THE AUTORESETEVENT CLASS
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AutoResetEvent will automatically switch from signaled to unsignaled as soon as a thread calls WaitOne, or some other wait method that we will cover later in the chapter. WaitOne is similar to getting in line to go through the turnstile. If Set is called before WaitOne, it is the same result as paying the fare before anyone is in line. As soon as they walk up they are allowed to proceed. One way that AutoResetEvent is very different than the typical subway turnstile is that there is no orderly progression. This means that there is no way of determining the order in which multiple threads waiting for a shared AutoResetEvent object will be released when the Set method is invoked. The behavior of AutoResetObject on a single-processor machine is often quite different than its behavior on a multipleprocessor machine. This reinforces the importance of regular testing during development on hardware that is similar to the targeted platform. Another way AutoResetEvent differs from the subway turnstile is that the threads waiting do not change the state of AutoResetEvent. They do not deposit their own token in the turnstile. Someone else must do it for them, since they are in a WaitSleepJoin state while they are waiting. Do not assume that one thread will execute before or after a different thread that is also waiting on a shared AutoResetEvent. When AutoResetEvent is signaled and one or more thread is waiting, all that is guaranteed is that a single thread will be released and that AutoResetEvent will return to the unsignaled state.
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Using the Reset method The Reset method changes the signaled state of AutoResetEvent to unsignaled. This is done automatically when a thread is released from the WaitSleepJoin state. There may be circumstances when no thread is waiting and it is set to signaled. Before a thread waits on that event, it may be determined that it should no longer be signaled. In that case, calling Reset will change the state back to unsignaled.
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