By Jeff Kramer, Jeff Magee
Concurrency presents a completely updated approach to the elemental options and strategies at the back of concurrent programming. Concurrent programming is complicated and calls for a way more formal method than sequential programming. so as to enhance an intensive knowing of the topic Magee and Kramer current ideas, options and difficulties via quite a few kinds: casual descriptions, illustrative examples, summary versions and urban Java examples. those combine to offer challenge styles and linked answer techniques which enable students to recognise difficulties and arrive at solutions.
New beneficial properties include:* New chapters masking application verification and logical properties.* extra pupil exercises.* assisting web site comprises an up-to-date model of the LTSA device for modelling concurrency, version animation, and version checking.* web site additionally comprises the entire set of kingdom types, java examples, and demonstration courses and a finished set of overhead slides for path presentation.
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Additional info for Concurrency: State Models and Java Programs
When you're ready for the thread to begin executing code, you call its start() method. This method performs some internal housekeeping and calls the thread's run() method. When the start() method returns, two threads are now executing in parallel: the original thread (which has returned from calling the start() method) and the newly started thread (which is now executing itsrun() method). After its start() method has been called, the new thread is said to be alive. In fact, the Thread class has anisAlive() method that tells you the state of the thread: if the isAlive() method returns true, the thread has been started and is executing itsrun() method.
However, as we mentioned at the end of the last chapter, other threads invoke methods of this object. For example, the newCharacter() method is called from the random character-generating thread (a character source) whenever the character to be typed changes. In this case, there is a race condition. The thread that calls thenewCharacter() method is accessing the same data as the thread that calls the paintComponent( ) method. The random character-generating thread may change the character while the event-dispatching thread is using it.
7 Summary In this chapter, we've had our first taste of threads. We've learned that threads are separate tasks executed by a single program. This is the key to thinking about how to design a good multithreaded program: what logical tasks make up your program? How can these tasks be separated to make the program logic easier, or benefit your program by running in parallel? In our case, we have two simple tasks: display a random character and display the key that a user types in response. In later chapters, we add more tasks (and more threads) to this list.