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lthough C# contains many exciting features, one of its most powerful is its built-in support for multithreaded programming A multithreaded program contains two or more parts that can run concurrently Each part of such a program is called a thread, and each thread defines a separate path of execution Thus, multithreading is a specialized form of multitasking Multithreaded programming relies on a combination of features defined by the C# language and by classes in the NET Framework Because support for multithreading is built into C#, many of the problems associated with multithreading in other languages are minimized or eliminated As you will see, C# s support of multithreading is both clean and easy to understand With the release of version 40 of the NET Framework, two important additions were made that relate to multithreaded applications The first is the Task Parallel Library (TPL), and the other is Parallel LINQ (PLINQ) Both provide support for parallel programming, and both can take advantage of multiple-processor (multicore) computers In addition, the TPL streamlines the creation and management of multithreaded applications Because of this, TPL-based multithreading is now the recommended approach for multithreading in most cases However, a working knowledge of the original multithreading subsystem is still important for several reasons First, there is much preexisting (legacy) code that uses the original approach If you will be working on or maintaining this code, you need to know how the original threading system operated Second, TPL-based code may still use elements of the original threading system, especially its synchronization features Third, although the TPL is based on an abstraction called the task, it still implicitly relies on threads and the thread-based features described here Therefore, to fully understand and utilize the TPL, a solid understanding of the material in this chapter is needed Finally, it is important to state that multithreading is a very large topic It is far beyond the scope of this book to cover it in detail This and the following chapter present an overview of the topic and show several fundamental techniques Thus, it serves as an introduction to this important topic and provides a foundation upon which you can build.

sides]

Part II:

The Creation of C#

While Java successfully addresses many of the issues surrounding portability in the Internet environment, there are still features that it lacks One is cross-language interoperability, also called mixed-language programming This is the ability for the code produced by one language to work easily with the code produced by another Cross-language interoperability is needed for the creation of large, distributed software systems It is also desirable for programming

Part I:

The nal thought might become:

If you review the first few paragraphs of Section 1, you will find an intuitively appealing definition of the logarithm to the base 2: log2 x is the power to which you need to raise 2 to obtain x With this intuitive notion we readily see that log2 16 = the power to which we raise 2 to obtain 16 = 4 and log2 (1/4) = the power to which we raise 2 to obtain 1/4 = 2 However, this intuitive approach does not work so well if we want to take log 5 or log2 7 Therefore we will give a new definition of the logarithm to any base a > 0 which in simple cases coincides with the intuitive notion of logarithm If a > 0 and b > 0 then loga b = ln b ln a

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