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Additionally, the NET garbage collector uses a mark-and-sweep algorithm During each garbage collection execution, it marks objects that are to be de-allocated and compacts together the objects that remain so there is no dirty space between them The use of compression to fill in the space left by de-allocated objects often results in faster instantiation of new objects (than with unmanaged code), because it is not necessary to search through memory to locate space for a new allocation This also decreases the chance of paging because more objects are located in the same page, which improves performance as well The garbage collector takes into consideration the resources on the machine and the demand on those resources at execution time For example, if memory on the computer is still largely untapped, the garbage collector is less likely to run and take time to clean up those resources, an optimization rarely taken by platforms and languages that are not based on garbage collection
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Type Safety One of the key advantages the runtime offers is checking conversions between types, or type checking Via type checking, the runtime prevents programmers from unintentionally introducing invalid casts that can lead to buffer overrun vulnerabilities Such vulnerabilities are one of the most common means of breaking into a computer system, and having the runtime automatically prevent these is a significant gain3 Type checking provided by the runtime ensures the following
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Both variables and the data the variables refer to are typed and that
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the type of the variable is compatible with the data that it refers to
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It is possible to locally analyze a type (without analyzing all of the
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code in which the type is used) to determine what permissions will be required to execute that type s members
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Each type has a compile-time-defined set of methods and the data
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they contain The runtime enforces rules about what classes can access those methods and data Methods marked as private, for example, are accessible only by the containing type
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3 Assuming you are not the unscrupulous type who is looking for such vulnerabilities
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21: The Common Language Infrastructure
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ADVANCED TOPIC Circumventing Encapsulation and Access Modifiers Given appropriate permissions, it is possible to circumvent encapsulation and access modifiers via a mechanism known as reflection Reflection provides late binding by enabling support for browsing through a type s members, looking up the names of particular constructs within an object s metadata, and invoking the type s members Code Access Security The runtime can make security checks as the program executes, allowing and disallowing the specific types of operations depending on permissions Permission to execute a specific function is not restricted to authentication of the user running the program The runtime also controls execution based on who created the program and whether she is a trusted provider Permissions can be tuned such that partially trusted providers can read and write files from controlled locations on the disk, but they are prevented from accessing other locations (such as email addresses from an email program) for which the provider has not been granted permission Identification of a provider is handled by certificates that are embedded into the program when the provider compiles the code Platform Portability One theoretical feature of the runtime is the opportunity it provides for C# code and the resultant programs to be platform-portable, capable of running on multiple operating systems and executing on different CLI implementations Portability in this context is not limited to the source code such that recompiling is necessary A single CLI module compiled for one platform should run on any CLI-compatible platform without needing to be recompiled This portability occurs because the work of porting the code lies in the hands of the runtime implementation rather than the application developer The restriction is, of course, that no platform-specific APIs are used Because of this restriction, many developers forgo CLI platform-neutral
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code in favor of accessing the underlying platform functionality, rather than writing it all from scratch The platform portability offered by NET, DotGNU, Rotor, and Mono varies depending on the goals of the platform developers For obvious reasons, NET was targeted to run only on the Microsoft series of operating systems Rotor, also produced by Microsoft, was primarily designed as a means for teaching and fostering research into future CLI development Its inclusion of support for FreeBSD proves the portability characteristics of the CLI Some of the libraries included in NET (such as WinForms, ASPNET, ADONET, and more) are not available in Rotor DotGNU and Mono were initially targeted at Linux but have since been ported to many different operating systems Furthermore, the goal of these CLIs was to provide a means for taking NET applications and porting them to operating systems in addition to those controlled by Microsoft In so doing, there is a large overlap between the APIs found in NET and those available in Mono and DotGNU
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Performance Many programmers accustomed to writing unmanaged code will correctly point out that managed environments impose overhead on applications, no matter how simple The trade-off is one of increased development productivity and reduced bugs in managed code versus runtime performance The same dichotomy emerged as programming went from assembler to higherlevel languages such as C, and from structured programming to objectoriented development In the vast majority of scenarios, development productivity wins out, especially as the speed and reduced price of hardware surpass the demands of applications Time spent on architectural design is much more likely to yield big performance gains than the complexities of a low-level development platform In the climate of security holes caused by buffer overruns, managed execution is even more compelling Undoubtedly, certain development scenarios (device drivers, for example) may not yet fit with managed execution However, as managed execution increases in capability and sophistication, many of these performance considerations will likely vanish Unmanaged execution will then be
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