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root/jsr166/jsr166/src/jsr166e/Striped64.java

Comparing jsr166/src/jsr166e/Striped64.java (file contents):
Revision 1.2 by jsr166, Tue Aug 2 18:22:20 2011 UTC vs.
Revision 1.6 by jsr166, Sat Oct 15 17:46:08 2011 UTC

#	Line 6 | Line 6
6
7		package jsr166e;
8		import java.util.Random;
9	–	import java.util.concurrent.atomic.AtomicInteger;
10	–	import java.util.concurrent.atomic.AtomicLong;
9
10		/**
11		* A package-local class holding common representation and mechanics
12		* for classes supporting dynamic striping on 64bit values. The class
13	<	* extends Number so that concrete subclasses can publicly do so.
13	>	* extends Number so that concrete subclasses must publicly do so.
14		*/
15		abstract class Striped64 extends Number {
16		/*
#	Line 79 | Line 77 | abstract class Striped64 extends Number
77		*/
78
79		/**
80	<	* Padded variant of AtomicLong supporting only raw accesses plus
81	<	* CAS The value field is placed between pads, hoping that the JVM
82	<	* doesn't reorder them.
80	>	* Padded variant of AtomicLong supporting only raw accesses plus CAS.
81	>	* The value field is placed between pads, hoping that the JVM doesn't
82	>	* reorder them.
83		*
84		* JVM intrinsics note: It would be possible to use a release-only
85		* form of CAS here, if it were provided.
#	Line 140 | Line 138 | abstract class Striped64 extends Number
138		*/
139		static final ThreadHashCode threadHashCode = new ThreadHashCode();
140
141	<	/** Nomber of CPUS, to place bound on table size */
141	>	/** Number of CPUS, to place bound on table size */
142		static final int NCPU = Runtime.getRuntime().availableProcessors();
143
144		/**
#	Line 150 | Line 148 | abstract class Striped64 extends Number
148
149		/**
150		* Base value, used mainly when there is no contention, but also as
151	<	* a fallback during table initializion races. Updated via CAS.
151	>	* a fallback during table initialization races. Updated via CAS.
152		*/
153		transient volatile long base;
154
#	Line 166 | Line 164 | abstract class Striped64 extends Number
164		}
165
166		/**
167	<	* CAS the base field
167	>	* CASes the base field.
168		*/
169		final boolean casBase(long cmp, long val) {
170		return UNSAFE.compareAndSwapLong(this, baseOffset, cmp, val);
171		}
172
173		/**
174	<	* CAS the busy field from 0 to 1 to acquire lock.
174	>	* CASes the busy field from 0 to 1 to acquire lock.
175		*/
176		final boolean casBusy() {
177		return UNSAFE.compareAndSwapInt(this, busyOffset, 0, 1);
#	Line 279 | Line 277 | abstract class Striped64 extends Number
277
278
279		/**
280	<	* Set base and all cells to the given value
280	>	* Sets base and all cells to the given value.
281		*/
282		final void internalReset(long initialValue) {
283		Cell[] as = cells;

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