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Creation QR Code JIS X 0510 in Visual Studio .NET Part IV

Part IV
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truly garbage . At this point, the second call to Collect forces another garbage collection, which reclaims all of the memory occupied by the now-finalized objects . For some applications (especially server applications that tend to keep a lot of objects in memory), the time required for the garbage collector to do a full collection that includes generation 2 can be excessive . In fact, if the collection takes a very long time to complete, then client requests might time out . To help these kinds of applications, the GC class offers a RegisterForFullGCNotification method . Using this method and some additional helper methods (WaitForFullGCApproach, WaitForFullGCComplete, and CancelFullGCNotification), an application can now be notified when the garbage collector is getting close to performing a full collection . The application can then call GC.Collect to force a collection at a more opportune time, or the application could communicate with another server to better load balance the client requests . For more information, examine these methods in the .NET Framework SDK documentation . Note that you should always call the WaitForFullGCApproach and WaitForFullGCComplete methods in pairs because the CLR handles them as pairs internally . Finally, the GC class offers two static methods to allow you to determine which generation an object is currently in:
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Int32 GetGeneration(Object obj) Int32 GetGeneration(WeakReference wr)
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The first version of GetGeneration takes an object reference as a parameter, and the second version takes a WeakReference reference as a parameter . The value returned will be between 0 and GC.MaxGeneration inclusively . The following code will help you understand how generations work . The code also demonstrates the use of the GC methods just discussed .
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using System; internal sealed class GenObj { ~GenObj() { Console.WriteLine("In Finalize method"); } } public static class Program { public static void Main() { Console.WriteLine("Maximum generations: " + GC.MaxGeneration); // Create a new GenObj in the heap. Object o = new GenObj(); // Because this object is newly created, it is in generation 0. Console.WriteLine("Gen " + GC.GetGeneration(o)); // 0
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Automatic Memory Management (Garbage Collection)
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// Performing a garbage collection promotes the object's generation. GC.Collect(); Console.WriteLine("Gen " + GC.GetGeneration(o)); // 1 GC.Collect(); Console.WriteLine("Gen " + GC.GetGeneration(o)); // 2 GC.Collect(); Console.WriteLine("Gen " + GC.GetGeneration(o)); // 2 (max)
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o = null; // Destroy the strong reference to this object. Console.WriteLine("Collecting Gen 0"); GC.Collect(0); // Collect generation 0. GC.WaitForPendingFinalizers(); // Finalize is NOT called. Console.WriteLine("Collecting Gens 0, and 1"); GC.Collect(1); // Collect generations 0 & 1. GC.WaitForPendingFinalizers(); // Finalize is NOT called. Console.WriteLine("Collecting Gens 0, 1, and 2"); GC.Collect(2); // Same as Collect() GC.WaitForPendingFinalizers(); // Finalize IS called. } }
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Building and running this code yields the following output:
Maximum generations: 2 Gen 0 Gen 1 Gen 2 Gen 2 Collecting Gen 0 Collecting Gens 0, and 1 Collecting Gens 0, 1, and 2 In Finalize method
Thread Hijacking
Earlier in this chapter, I explained the garbage collection algorithm . However, I made a big assumption during that discussion: that only one thread is running . In the real world, it s likely for multiple threads to be accessing the managed heap or at least manipulating objects allocated within the managed heap . When one thread sparks a garbage collection, other threads must not access any objects (including object references on its own stack) because the garbage collector is likely to move these objects, changing their memory locations . So when the garbage collector wants to start a garbage collection, all threads executing managed code must be suspended . The CLR has a few different mechanisms that it uses to safely suspend threads so that a garbage collection can be performed . The reason that
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