By Allen Holub
Studying find out how to write multithreaded functions is the major to taking complete good thing about the Java platform. In Taming Java Threads, famous columnist and Java specialist Allen Holub offers Java programmers with the data they should write actual multithreaded courses - courses with actual code. Holub presents an in-depth clarification of the way threads paintings in addition to information regarding easy methods to remedy universal difficulties akin to deadlocks and race stipulations. He not just explains universal difficulties, but in addition offers the unusual ideas that mark the variation among production-level code and toy demos.Topics coated during this e-book contain the structure of threads; the mutex and lock administration; situation variables and counting semaphores; timers, alarms, and swing thread defense; observers and multicasters; singletons, severe periods, and reader/writer locks; threads in an object-oriented global; and object-oriented threading architectures.While it really is necessary to construct help for threading right into a Java software from the very starting, such a lot books at the topics of Java-UI building and Java networking slightly contact on threading issues. besides being a uncomplicated Java reference, this e-book is a must-read for any Java developer.
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Additional resources for Ален Холаб. Приручаем потоки Java
The real issue here is that the Java specification does not require that wait() be implemented as an atomic operation (one that can't be preempted while moving from the condition variable to the monitor's lock). This means that using an if instead of a while might work in some Java implementations, but the behavior is really undefined. Using a spin lock instead of a simple if statement is cheap insurance against implementations that don't treat wait() as atomic. While we're on the subject of wait(), there's one additional point to consider.
7. The dequeueing thread now has to wait to reacquire the monitor before wait() can return, so it blocks again, this time on the lock associated with the monitor. It can't acquire the monitor because the second thread hasn't returned from enqueue() yet. 8. The enqueueing thread now returns from the enqueue() method releasing the monitor. 9. The dequeueing thread acquires the monitor, wait() returns, an object is dequeued, and dequeue() returns, releasing the monitor. 1, line 22) is pretty important.
So Wilma wakes up and tries to acquire lock_2 but can't because Betty has it. Wilma and Betty are now deadlocked. Neither thread can ever execute. Note that lock_1 and lock_2 are raw Object objects. The Object class isn't abstract, precisely so that you can use it as a roll-your-own lock. Of course, any Object will do as the argument to a synchronized statement; even an array will work. You can't use a primitive (like an int or boolean) for this purpose, however. Wilma and Betty are a contrived example, but the multiple-lock situation comes up frequently.
Ален Холаб. Приручаем потоки Java by Allen Holub