Synchronizing a Method Using MethodImplAttribute in Visual C#.NET

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Synchronizing a Method Using MethodImplAttribute
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The last synchronization method to point out is the MethodImplAttribute Used in conjunction with the MethodImplOptionsSynchronized method, this attribute marks a method as synchronized so that only one thread can execute the method at a time In the current implementation, this causes the JIT to treat the method as though it was surrounded by lock(this) Such an implementation means that, in fact, the method and all other methods on the same class, decorated with the same attribute and enum, are synchronized, not just each method relative to itself In other words, given two or more methods on the same class decorated with the attribute, only one of them will be able to execute at a time and the one executing will block all calls by other threads to itself or to any other method in the class with the same decoration
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One area where threading issues relating to the user interface may arise unexpectedly is when using one of the timer classes The trouble is that when timer notification callbacks fire, the thread on which they fire may not be the user interface thread, and therefore, it cannot safely access user interface controls and forms (see 16) Several timer classes are available, including SystemWindowsFormsTimer, SystemTimersTimer, and SystemThreadingTimer In creating SystemWindowsFormsTimer, the development team designed it specifically for use within a rich client user interface Programmers can drag it onto a form as a nonvisual control and control the behavior from within the Properties window Most importantly, it will always safely fire an event from a thread that can interact with the user interface The other two timers are very similarSystemThreadingTimer is essentially a lighter-weight implementation of SystemTimersTimer Specifically, SystemThreadingTimer does not derive from SystemComponentModelComponent, and therefore, it cannot be used as a component within a component container, something that implements SystemComponentModelIContainer Another difference is that SystemThreadingTimer enables the passing of state, an object parameter, from the call to start the timer and then into the call that fires the timer notification The remaining differences are simply in the API usability with SystemTimersTimer supporting a synchronization object and having calls that are slightly more intuitive Both SystemTimersTimer and SystemThreadingTimer are designed for use in server-type processes, and neither should interact directly with the user interface Furthermore, both timers use the system thread pool Table 153 provides an overall comparison of the various timers
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Table 153 Overview of the Various Timer Characteristics
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Feature Description Support for adding and removing listeners after the timer is instantiated
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SystemTimersTimer SystemThreadingTimer SystemWindowsFormsTimer
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Feature Description Supports callbacks onthe user interface thread
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Calls back Yes fromthreads obtained from the thread pool Supports draganddropin the Windows Forms Designer Suitable for running ina multithreaded server environment Includes support for passing arbitrary state from the timer initialization to the callback Implements
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IDisposable
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Yes Yes
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Supports onoffcallbacks as well as periodic repeating callbacks Accessible acrossapplication domain boundaries Supports
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IComponent;hostable
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in an IContainer
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using SystemWindowsFormsTimer is a relatively obvious choice for user interface programming The only caution is that a long-running operation on the user interface thread may delay the arrival of a timer's expiration Choosing between the other two options is less obvious, and generally, the difference between the two is insignificant If hosting within an IContainer is necessary, then SystemTimersTimer is the right choice However, if no specific SystemTimersTimer feature is required, then choose SystemThreadingTimer by default, simply because it is a slightly lighterweight implementation Listing 1516 and Listing 1517 provide sample code for using SystemTimersTimer and SystemThreadingTimer, respectively Their code is very similar, including the fact that both support instantiation within a using statement because both support IDispose The output for both listings is identical, as shown in Output 1513
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Listing 1516 Using SystemTimersTimer
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using System; using SystemTimers; using SystemThreading;
// Because Timer exists in both the SystemTimers and // SystemThreading namespaces, you disambiguate "Timer" // using an alias directive using Timer = SystemTimersTimer; class UsingSystemTimersTimer { private static int _Count=0; private static readonlyAutoResetEvent _ResetEvent = new AutoResetEvent(false); private static int _AlarmThreadId; public static void Main() { using( Timer timer = new Timer() ) { // Initialize Timer timerAutoReset = true; timerInterval = 1000; timerElapsed += new ElapsedEventHandler(Alarm); timerStart(); // Wait for Alarm to fire for the 10th time _ResetEventWaitOne(); } // Verify that the thread executing the alarm // Is different from the thread executing Main if(_AlarmThreadId == ThreadCurrentThreadManagedThreadId) { throw new ApplicationException( "Thread Ids are the same"); } if(_Count < 9) { throw newApplicationException(" _Count < 9"); }; ConsoleWriteLine( "(Alarm Thread Id) {0} != {1} (Main Thread Id)", _AlarmThreadId, ThreadCurrentThreadManagedThreadId); ConsoleWriteLine("Final Count = {0}", _Count); } static void Alarm(object sender, ElapsedEventArgs eventArgs) { _Count++; ConsoleWriteLine("{0}:- {1}", eventArgsSignalTimeToString("T"), _Count); if (_Count >= 9) { _AlarmThreadId = ThreadCurrentThreadManagedThreadId; _ResetEventSet(); }
In Listing 1516, you have using directives for both SystemThreading and SystemTimers This makes the Timer type ambiguous Therefore, use an alias to explicitly associate Timer with SystemTimersTimer One noteworthy characteristic of SystemThreadingTimer is that it takes the callback delegate and interval within the constructor