By Scott Oaks, Henry Wong
Threads aren't a brand new thought: many working platforms and languages help them. yet regardless of common help, threads are usually anything that everybody talks approximately, yet few use. Programming with threads has a name for being difficult and nonportable.Not so with Java. Java's thread amenities are effortless to take advantage of, and - like every thing else in Java - are thoroughly moveable among structures. and that is an excellent factor, simply because it is most unlikely to jot down whatever however the least difficult applet with no encountering threads. on the way to paintings with Java, you might want to know about threads.This new version indicates you the way to take complete good thing about Java's thread amenities: the place to exploit threads to extend potency, how one can use them successfully, and the way to prevent universal mistakes.Java Threads, 2d version discusses difficulties like impasse, race situation, and hunger intimately, assisting you to jot down code with out hidden insects. It brings you brand new with the most recent adjustments within the thread interface for JDK 1.2.The e-book deals a radical dialogue of the Thread and ThreadGroup periods, the Runnable interface, the language's synchronized operator. It explains thread scheduling ends by way of constructing a CPUSchedule classification, exhibiting you ways to enforce your individual scheduling coverage. additionally, Java Threads, second variation indicates you ways to increase Java's thread primitives. different prolonged examples comprise sessions that enforce reader/writer locks, common locks, locks at arbitrary scope, and asynchronous I/O. This variation additionally provides vast examples on thread swimming pools, complicated synchronization approach, like variables, obstacles, and daemon locks. It indicates the best way to paintings with sessions that aren't thread secure, and will pay specific recognition to threading concerns with Swing. a brand new bankruptcy exhibits you the way to jot down parallel code for multiprocessor machines.In brief, Java Threads, second variation covers every little thing you must find out about threads, from the easiest animation applet to the main complicated purposes. when you plan to do any critical paintings in Java, you'll find this booklet useful. Examples to be had on-line. Covers Java 2.
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Additional resources for Java Threads
A static method does not have a concept of the this reference. It is not possible to obtain the object lock of an object that does not exist. So how does synchronization of static methods work? To answer this question, we will introduce the concept of a class lock. Just as there is an object lock that can be obtained for each instance of a class (object), there is a lock that can be obtained for each class. We will refer to this as the class lock .
When is a thread active? At first glance, this seems to be a simple question. Using the isAlive() method, a thread is considered alive during the period between the call to the start() method and a short time period after the stop() method is called. We might consider a thread active if it is alive. However, if the definition of an active thread is a thread whose thread reference appears in the active count returned by the activeCount() method, we would have a different definition of active. A thread reference first appears in the thread array returned by the enumerate() method, and is counted by the activeCount() method, when the thread object is first constructed and not when the thread is started.
Page 30 Java Threads, 2nd edition Chapter 3. Synchronization Techniques In the previous chapter, we covered a lot of ground: we examined how to create and start threads, how to arrange for them to terminate, how to name them, how to monitor their life cycles, and so on. In the examples of that chapter, however, the threads that we examined were more or less independent: they did not need to share any data between them. In this chapter, we look at the issue of sharing data between threads. Sharing data between threads is often hampered due to what is known as a race condition between the threads attempting to access the same data more or less simultaneously.