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The nature of the work being performed will influence the design. As with all designs the tasks being performed will impact the decisions made. There is no magic formula for multithreaded applications. There are design patterns than can be followed that work for a certain class of problems, but there is no general solution. Experience, benchmarking, and patience are the best tools for becoming a seasoned multithreaded developer. 17.4.3 Implications of multiple processors Multiple processors allow multiple threads to execute simultaneously. This is a tremendous benefit for high-performance systems. The cost of the parallelism comes in the form of shared memory. Anytime values must be shared between threads there is a considerable performance penalty if multiple processors are involved. The basic problem is that all involved threads must reach a state when the value is certain to be correct. The impact of shared values among threads should motivate designers to minimize sharing of data as much as possible. As mentioned earlier, testing should always be done on a system that is similar to production. There are concurrency issues that will not occur, or occur very infrequently, on a single-processor system that will occur with a high degree of regularity on a multipleprocessor system. The result of this sort of situation is generally reflected in a developer saying It works on my machine, which does little to solve the production issue.
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This chapter has revisited the design considerations that have been covered throughout this book. The most important concept to take away from this chapter is that there is no single correct way of using multiple threads. As with many things, there are wrong ways of solving the problem, but there is no magical algorithm that will solve all design issues. We have covered the asynchronous design pattern and seen how it is implemented in various .NET objects. The asynchronous design pattern is an ideal approach to use for many situations. One of the key advantages it has over other approaches is that developers will become very familiar with it as they do .NET development. By creating custom libraries that follow this pattern, developers will have a pretty good idea of how to use your library without having it explained to them. We also covered the concept of associating a class with a single working thread. This generally involves a queue, and the thread s job is to keep that queue empty. A one-class one-thread approach works well for situations where the caller of a method does not care about the result of the processing of that method. Additionally, classes that contain multiple threads appear to the users of those classes as though they were any other class. An example of such a class in the .NET framework is WebClient. It is multithreaded, but the users of the class aren t required to know that fact to use it. It is important when dealing with a new topic to not forget the lessons learned with previous technologies. All too often when faced with an unfamiliar task we forget the discipline, structure, and procedures that have served us well in the past.
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CHAPTER 1 7
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18.1 18.2 18.3 18.4 J# s Thread class 301 The Runnable interface 314 Concurrency control in J# 317 Summary 328
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J# is very similar to Microsoft J++ and Java programming language. It is intended to provide a way for developers familiar with Java to utilize the .NET platform.
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J# contains a Thread class that is very similar to the System.Threading.Thread class. One fundamental difference is that the .NET System.Threading.Thread class is sealed. This means that it cannot be inherited from. In J# it s possible, and often desirable, to subclass the Thread class.
Extending the Thread class One way that J# allows for threads to be created is by inheriting from the Thread class. In C# and VB.NET the Thread class is a sealed class. It contains methods and properties relating to threads and their creation. J# takes an older approach where a class can be created that contains an overridden method named run that is the entry point for the new thread. Listing 18.1 contains a class that was created by subclassing Thread.
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