Ален Холаб. Приручаем потоки Java by Allen Holub

By Allen Holub

Studying the way to write multithreaded functions is the foremost to taking complete benefit of the Java platform. In Taming Java Threads, famous columnist and Java professional Allen Holub offers Java programmers with the knowledge they should write actual multithreaded courses - courses with actual code. Holub offers an in-depth rationalization of the way threads paintings besides information regarding how you can clear up universal difficulties corresponding to deadlocks and race stipulations. He not just explains universal difficulties, but in addition offers the unusual recommendations that mark the adaptation among production-level code and toy demos.Topics coated during this booklet comprise the structure of threads; the mutex and lock administration; situation variables and counting semaphores; timers, alarms, and swing thread safeguard; observers and multicasters; singletons, severe classes, and reader/writer locks; threads in an object-oriented international; and object-oriented threading architectures.While it truly is necessary to construct aid for threading right into a Java application from the very starting, such a lot books at the topics of Java-UI building and Java networking slightly contact on threading issues. in addition to being a easy Java reference, this e-book is a must-read for any Java developer.

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There's no simple solution to this problem. The modify() method is indeed synchronized in this earlier example, but run() can't be. Were it synchronized, you'd enter the monitor (and lock the object) when you started up the thread. Thereafter, any other thread that called any synchronized method on the object, such as modify(), would block (be suspended) until the monitor was released. Because run() doesn't return (as is often the case), the release will never happen, and the thread will act like a black hole, sucking up any other thread that calls any of its synchronized methods.

1, line 9) should treat a timeout of 0 as a request to not wait at all, but simply return false if the resource isn't available. FOREVER as a timeout when you want to wait forever. ) The Semaphore interface also defines two inner classes (interfaces can contain public static classes in Java). Objects of the Timed_out class can be thrown when a semaphore times out—when a predetermined amount of time elapses and you still haven't acquired a lock, for example. Objects of class Ownership can be thrown when an object that doesn't own a mutex-like semaphore tries to release it.

6. The thread normally synchronizes with the outer class by issuing a notify(), which matches the wait() on line 27. However, if the exception is thrown, the thread is terminated without issuing the notify(), and wait() never returns. Moreover, the test() method is still holding the lock it acquired on entry, so any thread that calls a synchronized method of the Exception_test class after the exception is thrown will block forever. This behavior is a variant on nested-monitor lockout, and obviously can be a problem when an exception is thrown by a thread that holds a roll-your-own lock, such as the ones I'll be discussing later in the book, or when one thread is waiting to be notified by another.

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