c# data matrix code RELIABLE RESOURCE MANAGEMENT in C#

Generating DataMatrix in C# RELIABLE RESOURCE MANAGEMENT

CHAPTER 11 RELIABLE RESOURCE MANAGEMENT
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In the current version of C++/CLI, as well as C#, the explicit call to PrepareConstrainedRegions and the try...finally block are necessary to reduce the likelihood of a stack overflow during a critical phase. However, PrepareConstrainedRegions definitely has its limits. Since the managed stack is implemented based on the native stack, a stack overflow that occurs while the native function XYZConnect is executed ends up in a managed StackOverflowException. PrepareConstrainedRegions is not able to determine the stack space required by the call to the native XYZConnect function. To take a native function into account, PrepareConstrainedRegions can only guess a value.
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Another asynchronous exception that needs attention is System::OutOfMemoryException. At first, it seems that an OutOfMemroyException is not an asynchronous exception at all, because according to the official MSDN documentation, an OutOfMemoryException can be thrown by the IL instructions newobj, newarr, and box. It is obvious that a gcnew operation (which is translated to the IL instructions newobj or newarr) can result in an OutOfMemoryException. Boxing can also cause an OutOfMemoryException because each time a value is boxed, a new object is instantiated on the GC heap. In all these cases, an OutOfMemoryException is not thrown asynchronously, but as a result of the normal execution flow. However, according to the MSDN article Keep Your Code Running with the Reliability Features of the .NET Framework, by Stephen Toub (http://msdn.microsoft.com/msdnmag/ issues/05/10/Reliability), an OutOfMemoryException can be thrown in asynchronous scenarios, too. Toub writes, An OutOfMemoryException is thrown during an attempt to procure more memory for a process when there is not enough contiguous memory available to satisfy the demand . . . Calling a method that references a type for the first time will result in the relevant assembly being delay-loaded into memory, thus requiring allocations. Executing a previously unexecuted method requires that method to be just-in-time (JIT) compiled, requiring memory allocations to store the generated code and associated runtime data structures. According to Brian Grunkemeyer, on the BCL Team Blog (http://blogs.msdn.com/ bclteam/archive/2005/06/14/429181.aspx), CERs are eagerly prepared, meaning that when we see one, we will eagerly JIT any code found in its statically-discoverable call graph. This means that an OutOfMemoryException caused by JIT compilation may be thrown before the CER is entered. The reason why I use the careful phrasing may be thrown here is that only the statically discoverable call graph can be JIT-compiled when a CER is prepared. Virtual methods called within a CER are not part of the statically discoverable call graph. When a managed function calls a native function that does a callback into managed code, the managed callback function isn t part of the statically discoverable call graph either. If you are aware of such a callback from native code, you can use the helper function RuntimeHelpers::PrepareMethod. To prepare a virtual function that you want to call during a CER so that the most derived override is JIT-compiled before the CER starts, you can use PrepareMethod as well. Analogous to PrepareMethod, there is also a PrepareDelegate function that you must use to ensure that the target of a delegate is JIT-compiled before the CER starts. Even if you use PrepareMethod, PrepareDelegate, and PrepareConstrainedRegions, allocation of memory on the managed heap can still cause an OutOfMemoryException. There is not that much that the runtime can do to prevent an OutOfMemoryException from being thrown.
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CHAPTER 11 RELIABLE RESOURCE MANAGEMENT
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It is the programmer s responsibility to prevent memory allocations in CERs. Several operations are explicitly forbidden in CERs. These operations include the following: Usage of gcnew, because it results in newobj and newarr IL instructions. Boxing. Acquiring a CLR-specific object-based thread lock via Monitor.Enter or msclr::lock. Entering such a lock can result in a new lock structure being allocated. CAS checks. Calling .NET objects via special proxy objects called transparent proxies. In the current release of the CLR and the C++/CLI language, these constraints are nothing more than guidelines. Neither the runtime nor the compilers check whether a method is actually implemented according to the CER restrictions or not.
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