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Making PDF417 in Visual C# Part IV

Part IV
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using System; using System.Runtime; public static class Program { public static void Main() { try { // Logically reserve 1.5 GB of memory using (MemoryFailPoint mfp = new MemoryFailPoint(1500)) { // Perform memory-hungry algorithm in here } // Dispose will logically free the 1.5 GB of memory } catch (InsufficientMemoryException e) { // The memory could not be reserved Console.WriteLine(e); } } }
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Programmatic Control of the garbage Collector
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The System.GC type allows your application some direct control over the garbage collector . For starters, you can query the maximum generation supported by the managed heap by reading the GC.MaxGeneration property; this property always returns 2 . You can also force the garbage collector to perform a collection by calling one of the following two static methods:
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void GC.Collect(Int32 Generation) void GC.Collect() void Collect(Int32 generation, GCCollectionMode mode)
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The first method allows you to specify which generation(s) to collect . You can pass any integer from 0 to GC.MaxGeneration inclusive . Passing 0 causes generation 0 to be collected, passing 1 causes generations 1 and 0 to be collected, and passing 2 causes generations 2, 1, and 0 to be collected . The version of the Collect method that takes no parameters forces a full collection of all generations and is equivalent to calling:
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GC.Collect(GC.MaxGeneration);
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The third overload of Collect allows you to pass a generation and a GCCollectionMode . Table 21-1 describes the various GC collection mode symbols .
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21
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TABLE 21-1
Automatic Memory Management (Garbage Collection)
Symbols Defined by the GCCollectionMode Enumerated Type
Description
The same as calling GC.Collect with no flag . Today, this is the same as passing Forced, but this may change in a future version of the CLR . Forces a collection to occur immediately for all generations up to and including the specified generation . The garbage collector will only perform a collection if the collection would be productive either by freeing a lot of memory or by reducing fragmentation . If the garbage collection would not be productive, then the call has no effect .
Symbol Name
Default
Forced Optimized
Under most circumstances, you should avoid calling any of the Collect methods; it s best just to let the garbage collector run on its own accord and fine-tune its generation budgets based on actual application behavior . However, if you re writing a console user interface (CUI) or graphical user interface (GUI) application, your application code owns the process and the CLR in that process . For these application types, you might want to suggest a garbage collection to occur at certain times using a GCCollectionMode of Optimized . Normally, modes of Default and Forced are used for debugging and testing . For example, you might consider calling the Collect method if some non-recurring event has just occurred that has likely caused a lot of old objects to die . The reason that calling Collect in such a circumstance may not be so bad is that the garbage collector s predictions of the future based on the past are not likely to be accurate for non-recurring events . For example, it might make sense for your application to force a full garbage collection of all generations after your application initializes or after the user saves a data file . When a Windows Form control is hosted on a Web page, a full collection is performed each time a page is unloaded . Don t explicitly call Collect to try to improve your application s response time; call it to reduce your process s working set . The GC type also offers a WaitForPendingFinalizers method . This method simply suspends the calling thread until the thread processing the freachable queue has emptied the queue, calling each object s Finalize method . In most applications, it s unlikely that you ll ever have to call this method . Occasionally, though, I ve seen code like this:
GC.Collect(); GC.WaitForPendingFinalizers(); GC.Collect();
This code forces a garbage collection . When the collection is complete, the memory for objects that don t require finalization is reclaimed . But the objects that do require finalization can t have their memory reclaimed yet . After the first call to Collect returns, the special, dedicated finalization thread is calling Finalize methods asynchronously . The call to WaitForPendingFinalizers puts the application s thread to sleep until all Finalize methods are called . When WaitForPendingFinalizers returns, all of the finalized objects are now
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