Concurrent Programming in Java(TM): Design Principles and - download pdf or read online

By Doug Lea

ISBN-10: 0201310090

ISBN-13: 9780201310092

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Copyright © 2002 Safari Tech Books Online. All rights reserved. 2 Synchronization Locking protects against low-level storage conflicts and corresponding high-level invariant failures. : next is always even ++n; ++n; return n; } } Without locking, the desired postcondition may fail due to a storage conflict when two or more threads execute the next method of the same Even object. Here is one possible execution trace, showing only the reads and writes to variable n that would result from the putfields and getfields in compiled bytecode.

Concurrent programs that do not use synchronization fail for many reasons, including memory consistency problems. 3 Ordering Ordering rules fall under two cases, within-thread and between-thread: ● ● From the point of view of the thread performing the actions in a method, instructions proceed in the normal as-if-serial manner that applies in sequential programming languages. From the point of view of other threads that might be "spying" on this thread by concurrently running unsynchronized methods, almost anything can happen.

Class instances are Objects. As described below, the locks associated with Class objects are used in static synchronized methods. 2 Synchronized methods and blocks There are two syntactic forms based on the synchronized keyword, blocks and methods. Block synchronization takes an argument of which object to lock. This allows any method to lock any object. The most common argument to synchronized blocks is this. Block synchronization is considered more fundamental than method synchronization. htm (2 of 27) [10/23/2003 11:40:19 PM] Safari Tech Books Online - Concurrent Programming in Java™: Design Principles and Patterns, Second Edition void f() { synchronized(this) { /* body */ } } The synchronized keyword is not considered to be part of a method's signature.

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Concurrent Programming in Java(TM): Design Principles and Pattern by Doug Lea

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