21: The Common Language Infrastructure in Visual C#.NET

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21: The Common Language Infrastructure
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reserved for development where precise control or circumvention of the runtime is deemed necessary4 Furthermore, the runtime introduces several factors that can contribute to improved performance over native compilation For example, because translation to machine code takes place on the destination machine, the resultant compiled code matches the processor and memory layout of that machine, resulting in performance gains generally not leveraged by nonjitted languages Also, the runtime is able to respond to execution conditions that direct compilation to machine code rarely takes into account If, for example, there is more memory on the box than is required, unmanaged languages will still de-allocate their memory at deterministic, compiletime-defined execution points in the code Alternatively, jit-compiled languages will need to de-allocate memory only when it is running low or when the program is shutting down Even though jitting can add a compile step to the execution process, code efficiencies that a jitter can insert lead to performance rivaling that of programs compiled directly to machine code Ultimately, CLI programs are not necessarily faster than non-CLI programs, but their performance is competitive
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By introducing a layer between the program and the operating system, it is possible to implement virtual processes or applications known as application domains (app domains) An application domain behaves like an operating system process in that it offers a level of isolation between other application domains For example, an app domain has its own virtual memory allocation, and communication between application domains requires distributed communication paradigms, just as it would between two operating system processes Similarly, static data is not shared between application domains, so static constructors run for each application domain, and assuming a single thread per application domain, there is no need to synchronize the static data because each application has its own instance of the data Furthermore, each application domain has its own threads, and
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4 Indeed, Microsoft has indicated that managed development will be the predominant means of writing applications for its Windows platform in the future, even those applications that integrate with the operating system
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Assemblies, Manifests, and Modules
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just like with an operating system process, threads cannot cross application domain boundaries The point of an application domain is that operating systems are considered relatively expensive With application domains, you can avoid this additional expense by running multiple application domains within a single process For example, you can use a single process to host a series of web sites However, you can isolate the web sites from each other by placing them in their own application domain In summary, application domains represent a virtual process on a layer between an operating system process and the threads
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Included in the CLI is the specification of the CIL output from a source language compiler, usually an assembly In addition to the CIL instructions themselves, an assembly includes a manifest that is made up of the following:
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The types that an assembly defines and imports Version information about the assembly itself Additional files the assembly depends on Security permissions for the assembly
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The manifest is essentially a header to the assembly, providing all the information about what an assembly is composed of, along with the information that uniquely identifies it Assemblies can be class libraries or the executables themselves, and one assembly can reference other assemblies (which, in turn, can reference more assemblies), thereby establishing an application composed of many components rather than one large, monolithic program This is an important feature that modern programming platforms take for granted, because it significantly improves maintainability and allows a single component to be shared across multiple programs In addition to the manifest, an assembly contains the CIL code within one or more modules Generally, the assembly and the manifest are combined into a single file, as was the case with HelloWorldexe in 1
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