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There are two distinct types of multitasking: process-based and thread-based It is important to understand the difference between the two A process is, in essence, a program that is executing Thus, process-based multitasking is the feature that allows your computer to run two or more programs concurrently For example, process-based multitasking allows you to run a word processor at the same time you are using a spreadsheet or browsing the Internet In process-based multitasking, a program is the smallest unit of code that can be dispatched by the scheduler A thread is a dispatchable unit of executable code The name comes from the concept of a thread of execution In a thread-based multitasking environment, all processes have at least one thread, but they can have more This means that a single program can perform two or more tasks at once For instance, a text editor can be formatting text at the same time that it is printing, as long as these two actions are being performed by two separate threads The differences between process-based and thread-based multitasking can be summarized like this: Process-based multitasking handles the concurrent execution of programs Thread-based multitasking deals with the concurrent execution of pieces of the same program The principal advantage of multithreading is that it enables you to write very efficient programs because it lets you utilize the idle time that is present in most programs As you probably know, most I/O devices, whether they be network ports, disk drives, or the keyboard, are much slower than the CPU Thus, a program will often spend a majority of its execution time waiting to send or receive information to or from a device By using multithreading, your program can execute another task during this idle time For example, while one part of your program is sending a file over the Internet, another part can be reading keyboard input, and still another can be buffering the next block of data to send A thread can be in one of several states In general terms, it can be running It can be ready to run as soon as it gets CPU time A running thread can be suspended, which is a temporary halt to its execution It can later be resumed A thread can be blocked when waiting for a resource A thread can be terminated, in which case its execution ends and cannot be resumed The NET Framework defines two types of threads: foreground and background By default, when you create a thread, it is a foreground thread, but you can change it to a background thread The only difference between foreground and background threads is that a background thread will be automatically terminated when all foreground threads in its process have stopped Along with thread-based multitasking comes the need for a special type of feature called synchronization, which allows the execution of threads to be coordinated in certain well-defined ways C# has a complete subsystem devoted to synchronization, and its key features are also described here All processes have at least one thread of execution, which is usually called the main thread because it is the one that is executed when your program begins Thus, the main thread is the thread that all of the preceding example programs in the book have been using From the main thread, you can create other threads C# and the NET Framework support both process-based and thread-based multitasking Thus, using C#, you can create and manage both processes and threads However, little programming effort is required to start a new process because each process is largely separate from the next Rather, it is C# s support for multithreading that is.

23:

The numerator of B equals log7 ( 35 ) log7 ( 161/4 ) = log7 243 log7 2 = log7 ( 243/2) Similarly, the denominator can be rewritten as log7 53 + log7 ( 321/5 ) = log7 125 + log7 2 = log7 ( 125 2) = log7 250 Putting these two results together, we find that B= log7 243/2 log7 250

important Because support for multithreading is built in, C# makes it easier to construct high-performance, multithreaded programs than do some other languages The classes that support multithreaded programming are defined in the SystemThreading namespace Thus, you will usually include this statement at the start of any multithreaded program:

Gloria explains, Knowing to look first for a compound sentence and then for a complicated sentence made revising much easier I like having a model that provides speci c steps No matter how you revised this example, ask yourself if you made it more concise Did you shorten sentences while preserving the author s intention Did you convey needed information Remember, when shortening sentences, use as many words as you need to make your points, but no more

using SystemThreading;

The multithreading system is built upon the Thread class, which encapsulates a thread of execution The Thread class is sealed, which means that it cannot be inherited Thread defines several methods and properties that help manage threads Throughout this chapter, several of its most commonly used members will be examined

= log250 ( 243/2)