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proposals and reports The category organizational structure is also appropriate for matter-of-fact short narratives, such as announcements and E-mails Proposals Proposals typically use a category organizational structure to make it easy for readers to locate speci c units of information Michelle, for instance, wrote a grant request that ran more than fty pages It was a huge endeavor The museum that I work for wanted to install new lighting, and I wrote a proposal to a private foundation that provides funds for infrastructure improvements I chose the category organizational structure as a way of making the huge amount of information manageable I ended up with six categories: our attendance gures testimonials from curators about the importance of lighting an engineering report about ne art lighting standards an electrician s cost estimates background information about the museum and how we serve the community 6 copies of legal documents proving our nonpro t status As I wrote the proposal, I kept discovering new categories Having selected the category organizational structure, I was able to easily add new categories, combine some closely related ones, and eliminate some that weren t relevant I can t imagine how much more dif cult it would have been if I had been trying to track and revise one fty-page unit instead of the smaller, easy-to-identify units We got the money, by the way! Reports The category organizational structure also works well in reports Using this structure ensures that each section is short and focused, two standards of excellence in business writing Karl s boss expected each of his direct subordinates to write a monthly activity report Karl explained that he used to use a straight narrative 1 2 3 4 5

the program will never terminate because it will be waiting for the main thread to end!

Version 40 of the NET Framework adds new multithreading features that you might find useful The most important is the new cancellation system The cancellation system supports a mechanism by which a thread can be cancelled easily in a well-defined, structured way It is based on the concept of a cancellation token, which is used to specify the cancellation state of a thread Cancellation tokens are supported by the CancellationTokenSource class and the CancellationToken structure Because the cancellation system is fully integrated into the new Task Parallel Library, it is described in 24, where the TPL is discussed SystemThreading adds a structure called SpinWait It provides the methods SpinOnce( ) and SpinUntil( ) that give you greater control over spin waiting In general, on single-

23:

Since this is done n times during the year, the result at the end of the year is that the account holds P 1+ p 100n

processor systems, SpinWait will yield On multiprocessor systems, it will use a loop Another spin-related element is the SpinLock, which uses a loop to wait until a lock is available The Thread class adds a method called Yield( ) that simply yields the remainder of a thread s timeslice It is shown here: public static bool Yield( ) It returns true if a context switch occurred, and false otherwise A context switch will not occur if there is not another thread that is ready to run

The key to effectively utilizing multithreading is to think concurrently rather than serially For example, when you have two subsystems within a program that can execute concurrently, consider making them into individual threads A word of caution is in order, however If you create too many threads, you can actually degrade your program s performance rather than enhance it Remember, there is some overhead associated with context switching If you create too many threads, more CPU time will be spent changing contexts than in executing your program! Finally, for new code consider using the Task Parallel Library to accomplish multithreading

division Thus, in the first test, d is 2 and the modulus operation is performed The second test fails because d is set to zero, and the modulus operation is skipped, avoiding a divideby-zero error Finally, the normal AND operator is tried This causes both operands to be evaluated, which leads to a runtime error when the division-by-zero occurs Since the short-circuit operators are, in some cases, more efficient than their normal counterparts, you might be wondering why C# still offers the normal AND and OR operators The answer is that in some cases you will want both operands of an AND or OR operation to be evaluated because of the side effects produced Consider the following:

dollars at the end of the year Similarly, at the end of t years, the money accumulated will be p P 1+ 100n Let us set k= and rewrite ( ) as 1 P 1+ k

// Side effects can be important using System; class SideEffects { static void Main() { int i; bool someCondition = false; i = 0; // Here, i is still incremented even though the if statement fails if(someCondition & (++i < 100)) ConsoleWriteLine("this won't be displayed"); ConsoleWriteLine("if statement executed: " + i); // displays 1 // In this case, i is not incremented because the short-circuit // operator skips the increment if(someCondition && (++i < 100)) ConsoleWriteLine("this won't be displayed"); ConsoleWriteLine("if statement executed: " + i); // still 1 !! } }