--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/EDU/oswego/cs/dl/util/concurrent/ReaderPreferenceReadWriteLock.java	Sat Mar 21 11:00:06 2009 +0000
@@ -0,0 +1,30 @@
+/*
+  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;
+  }
+}
+