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By Thierry.Lefort
via infoq.com
Published: Mar 10 2010 / 11:32
Memory barriers, or fences, are a set of processor instructions used to apply ordering limitations on memory operations. This article explains the impact memory barriers have on the determinism of multi-threaded programs. We'll look at how memory barriers relate to JVM concurrency constructs such as volatile, synchronized and atomic conditionals. It is assumed the reader has a solid understanding of these concepts and the Java memory model. This is not an article about mutual exclusion, parallelism or atomicity per se. Memory barriers are used to achieve an equally important element of concurrent programming called visibility.
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