Mercurial > hg > blitz_condensed
view src/EDU/oswego/cs/dl/util/concurrent/ReaderPreferenceReadWriteLock.java @ 28:4b2f23b6feca
Add a schema compatibility check to indexer that parallels storage.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:11:15 +0100 |
parents | 3dc0c5604566 |
children |
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/* File: ReaderPreferenceReadWriteLock.java Originally written by Doug Lea and released into the public domain. This may be used for any purposes whatsoever without acknowledgment. Thanks for the assistance and support of Sun Microsystems Labs, and everyone contributing, testing, and using this code. History: Date Who What 11Jun1998 dl Create public version */ package EDU.oswego.cs.dl.util.concurrent; /** * A ReadWriteLock that prefers waiting readers over * waiting writers when there is contention. The range of applicability * of this class is very limited. In the majority of situations, * writer preference locks provide more reasonable semantics. * * <p>[<a href="http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html"> Introduction to this package. </a>] **/ public class ReaderPreferenceReadWriteLock extends WriterPreferenceReadWriteLock { protected boolean allowReader() { return activeWriter_ == null; } }