author | dl |
Fri, 28 Jun 2013 12:12:37 +0100 | |
changeset 18576 | 7a5c231327af |
parent 16011 | 890a7ed97f6c |
child 19380 | 22eefc44fad6 |
permissions | -rw-r--r-- |
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/* |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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|
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/* |
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* This file is available under and governed by the GNU General Public |
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* License version 2 only, as published by the Free Software Foundation. |
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* However, the following notice accompanied the original version of this |
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* file: |
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* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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*/ |
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package java.util.concurrent.atomic; |
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import java.util.function.LongBinaryOperator; |
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import java.util.function.DoubleBinaryOperator; |
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import java.util.concurrent.ThreadLocalRandom; |
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|
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/** |
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* A package-local class holding common representation and mechanics |
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* for classes supporting dynamic striping on 64bit values. The class |
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* extends Number so that concrete subclasses must publicly do so. |
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*/ |
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abstract class Striped64 extends Number { |
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/* |
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* This class maintains a lazily-initialized table of atomically |
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* updated variables, plus an extra "base" field. The table size |
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* is a power of two. Indexing uses masked per-thread hash codes. |
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* Nearly all declarations in this class are package-private, |
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* accessed directly by subclasses. |
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* |
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* Table entries are of class Cell; a variant of AtomicLong padded |
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* (via @sun.misc.Contended) to reduce cache contention. Padding |
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* is overkill for most Atomics because they are usually |
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* irregularly scattered in memory and thus don't interfere much |
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* with each other. But Atomic objects residing in arrays will |
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* tend to be placed adjacent to each other, and so will most |
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* often share cache lines (with a huge negative performance |
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* impact) without this precaution. |
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* |
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* In part because Cells are relatively large, we avoid creating |
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* them until they are needed. When there is no contention, all |
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* updates are made to the base field. Upon first contention (a |
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* failed CAS on base update), the table is initialized to size 2. |
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* The table size is doubled upon further contention until |
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* reaching the nearest power of two greater than or equal to the |
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* number of CPUS. Table slots remain empty (null) until they are |
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* needed. |
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* |
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* A single spinlock ("cellsBusy") is used for initializing and |
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* resizing the table, as well as populating slots with new Cells. |
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* There is no need for a blocking lock; when the lock is not |
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* available, threads try other slots (or the base). During these |
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* retries, there is increased contention and reduced locality, |
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* which is still better than alternatives. |
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* |
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* The Thread probe fields maintained via ThreadLocalRandom serve |
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* as per-thread hash codes. We let them remain uninitialized as |
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* zero (if they come in this way) until they contend at slot |
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* 0. They are then initialized to values that typically do not |
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* often conflict with others. Contention and/or table collisions |
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* are indicated by failed CASes when performing an update |
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* operation. Upon a collision, if the table size is less than |
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* the capacity, it is doubled in size unless some other thread |
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* holds the lock. If a hashed slot is empty, and lock is |
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* available, a new Cell is created. Otherwise, if the slot |
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* exists, a CAS is tried. Retries proceed by "double hashing", |
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* using a secondary hash (Marsaglia XorShift) to try to find a |
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* free slot. |
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* |
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* The table size is capped because, when there are more threads |
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* than CPUs, supposing that each thread were bound to a CPU, |
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* there would exist a perfect hash function mapping threads to |
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* slots that eliminates collisions. When we reach capacity, we |
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* search for this mapping by randomly varying the hash codes of |
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* colliding threads. Because search is random, and collisions |
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* only become known via CAS failures, convergence can be slow, |
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* and because threads are typically not bound to CPUS forever, |
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* may not occur at all. However, despite these limitations, |
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* observed contention rates are typically low in these cases. |
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* |
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* It is possible for a Cell to become unused when threads that |
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* once hashed to it terminate, as well as in the case where |
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* doubling the table causes no thread to hash to it under |
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* expanded mask. We do not try to detect or remove such cells, |
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* under the assumption that for long-running instances, observed |
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* contention levels will recur, so the cells will eventually be |
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* needed again; and for short-lived ones, it does not matter. |
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*/ |
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/** |
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* Padded variant of AtomicLong supporting only raw accesses plus CAS. |
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* |
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116 |
* JVM intrinsics note: It would be possible to use a release-only |
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* form of CAS here, if it were provided. |
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*/ |
18576 | 119 |
@sun.misc.Contended static final class Cell { |
15283
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volatile long value; |
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Cell(long x) { value = x; } |
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122 |
final boolean cas(long cmp, long val) { |
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return UNSAFE.compareAndSwapLong(this, valueOffset, cmp, val); |
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} |
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125 |
|
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126 |
// Unsafe mechanics |
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127 |
private static final sun.misc.Unsafe UNSAFE; |
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private static final long valueOffset; |
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129 |
static { |
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try { |
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UNSAFE = sun.misc.Unsafe.getUnsafe(); |
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132 |
Class<?> ak = Cell.class; |
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133 |
valueOffset = UNSAFE.objectFieldOffset |
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(ak.getDeclaredField("value")); |
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135 |
} catch (Exception e) { |
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136 |
throw new Error(e); |
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} |
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138 |
} |
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139 |
} |
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140 |
|
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141 |
/** Number of CPUS, to place bound on table size */ |
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142 |
static final int NCPU = Runtime.getRuntime().availableProcessors(); |
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143 |
|
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144 |
/** |
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145 |
* Table of cells. When non-null, size is a power of 2. |
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146 |
*/ |
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147 |
transient volatile Cell[] cells; |
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148 |
|
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149 |
/** |
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150 |
* Base value, used mainly when there is no contention, but also as |
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151 |
* a fallback during table initialization races. Updated via CAS. |
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152 |
*/ |
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153 |
transient volatile long base; |
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154 |
|
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155 |
/** |
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156 |
* Spinlock (locked via CAS) used when resizing and/or creating Cells. |
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157 |
*/ |
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158 |
transient volatile int cellsBusy; |
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159 |
|
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160 |
/** |
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161 |
* Package-private default constructor |
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162 |
*/ |
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163 |
Striped64() { |
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164 |
} |
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165 |
|
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166 |
/** |
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167 |
* CASes the base field. |
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168 |
*/ |
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169 |
final boolean casBase(long cmp, long val) { |
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170 |
return UNSAFE.compareAndSwapLong(this, BASE, cmp, val); |
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171 |
} |
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172 |
|
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173 |
/** |
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174 |
* CASes the cellsBusy field from 0 to 1 to acquire lock. |
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175 |
*/ |
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176 |
final boolean casCellsBusy() { |
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177 |
return UNSAFE.compareAndSwapInt(this, CELLSBUSY, 0, 1); |
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178 |
} |
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179 |
|
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180 |
/** |
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181 |
* Returns the probe value for the current thread. |
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182 |
* Duplicated from ThreadLocalRandom because of packaging restrictions. |
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183 |
*/ |
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184 |
static final int getProbe() { |
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185 |
return UNSAFE.getInt(Thread.currentThread(), PROBE); |
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186 |
} |
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187 |
|
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188 |
/** |
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189 |
* Pseudo-randomly advances and records the given probe value for the |
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190 |
* given thread. |
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191 |
* Duplicated from ThreadLocalRandom because of packaging restrictions. |
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192 |
*/ |
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193 |
static final int advanceProbe(int probe) { |
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194 |
probe ^= probe << 13; // xorshift |
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195 |
probe ^= probe >>> 17; |
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196 |
probe ^= probe << 5; |
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197 |
UNSAFE.putInt(Thread.currentThread(), PROBE, probe); |
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198 |
return probe; |
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199 |
} |
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200 |
|
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201 |
/** |
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202 |
* Handles cases of updates involving initialization, resizing, |
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203 |
* creating new Cells, and/or contention. See above for |
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204 |
* explanation. This method suffers the usual non-modularity |
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205 |
* problems of optimistic retry code, relying on rechecked sets of |
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206 |
* reads. |
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207 |
* |
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208 |
* @param x the value |
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209 |
* @param fn the update function, or null for add (this convention |
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210 |
* avoids the need for an extra field or function in LongAdder). |
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211 |
* @param wasUncontended false if CAS failed before call |
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212 |
*/ |
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213 |
final void longAccumulate(long x, LongBinaryOperator fn, |
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214 |
boolean wasUncontended) { |
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215 |
int h; |
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216 |
if ((h = getProbe()) == 0) { |
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217 |
ThreadLocalRandom.current(); // force initialization |
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218 |
h = getProbe(); |
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219 |
wasUncontended = true; |
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220 |
} |
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221 |
boolean collide = false; // True if last slot nonempty |
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222 |
for (;;) { |
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223 |
Cell[] as; Cell a; int n; long v; |
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224 |
if ((as = cells) != null && (n = as.length) > 0) { |
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225 |
if ((a = as[(n - 1) & h]) == null) { |
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226 |
if (cellsBusy == 0) { // Try to attach new Cell |
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227 |
Cell r = new Cell(x); // Optimistically create |
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228 |
if (cellsBusy == 0 && casCellsBusy()) { |
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229 |
boolean created = false; |
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230 |
try { // Recheck under lock |
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231 |
Cell[] rs; int m, j; |
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232 |
if ((rs = cells) != null && |
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8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
233 |
(m = rs.length) > 0 && |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
234 |
rs[j = (m - 1) & h] == null) { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
235 |
rs[j] = r; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
236 |
created = true; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
237 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
238 |
} finally { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
239 |
cellsBusy = 0; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
240 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
241 |
if (created) |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
242 |
break; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
243 |
continue; // Slot is now non-empty |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
244 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
245 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
246 |
collide = false; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
247 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
248 |
else if (!wasUncontended) // CAS already known to fail |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
249 |
wasUncontended = true; // Continue after rehash |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
250 |
else if (a.cas(v = a.value, ((fn == null) ? v + x : |
16011
890a7ed97f6c
8004561: Additional functional interfaces, extension methods and name changes
mduigou
parents:
15283
diff
changeset
|
251 |
fn.applyAsLong(v, x)))) |
15283
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
252 |
break; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
253 |
else if (n >= NCPU || cells != as) |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
254 |
collide = false; // At max size or stale |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
255 |
else if (!collide) |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
256 |
collide = true; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
257 |
else if (cellsBusy == 0 && casCellsBusy()) { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
258 |
try { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
259 |
if (cells == as) { // Expand table unless stale |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
260 |
Cell[] rs = new Cell[n << 1]; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
261 |
for (int i = 0; i < n; ++i) |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
262 |
rs[i] = as[i]; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
263 |
cells = rs; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
264 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
265 |
} finally { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
266 |
cellsBusy = 0; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
267 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
268 |
collide = false; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
269 |
continue; // Retry with expanded table |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
270 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
271 |
h = advanceProbe(h); |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
272 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
273 |
else if (cellsBusy == 0 && cells == as && casCellsBusy()) { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
274 |
boolean init = false; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
275 |
try { // Initialize table |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
276 |
if (cells == as) { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
277 |
Cell[] rs = new Cell[2]; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
278 |
rs[h & 1] = new Cell(x); |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
279 |
cells = rs; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
280 |
init = true; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
281 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
282 |
} finally { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
283 |
cellsBusy = 0; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
284 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
285 |
if (init) |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
286 |
break; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
287 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
288 |
else if (casBase(v = base, ((fn == null) ? v + x : |
16011
890a7ed97f6c
8004561: Additional functional interfaces, extension methods and name changes
mduigou
parents:
15283
diff
changeset
|
289 |
fn.applyAsLong(v, x)))) |
15283
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
290 |
break; // Fall back on using base |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
291 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
292 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
293 |
|
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
294 |
/** |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
295 |
* Same as longAccumulate, but injecting long/double conversions |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
296 |
* in too many places to sensibly merge with long version, given |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
297 |
* the low-overhead requirements of this class. So must instead be |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
298 |
* maintained by copy/paste/adapt. |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
299 |
*/ |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
300 |
final void doubleAccumulate(double x, DoubleBinaryOperator fn, |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
301 |
boolean wasUncontended) { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
302 |
int h; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
303 |
if ((h = getProbe()) == 0) { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
304 |
ThreadLocalRandom.current(); // force initialization |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
305 |
h = getProbe(); |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
306 |
wasUncontended = true; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
307 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
308 |
boolean collide = false; // True if last slot nonempty |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
309 |
for (;;) { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
310 |
Cell[] as; Cell a; int n; long v; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
311 |
if ((as = cells) != null && (n = as.length) > 0) { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
312 |
if ((a = as[(n - 1) & h]) == null) { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
313 |
if (cellsBusy == 0) { // Try to attach new Cell |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
314 |
Cell r = new Cell(Double.doubleToRawLongBits(x)); |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
315 |
if (cellsBusy == 0 && casCellsBusy()) { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
316 |
boolean created = false; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
317 |
try { // Recheck under lock |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
318 |
Cell[] rs; int m, j; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
319 |
if ((rs = cells) != null && |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
320 |
(m = rs.length) > 0 && |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
321 |
rs[j = (m - 1) & h] == null) { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
322 |
rs[j] = r; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
323 |
created = true; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
324 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
325 |
} finally { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
326 |
cellsBusy = 0; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
327 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
328 |
if (created) |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
329 |
break; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
330 |
continue; // Slot is now non-empty |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
331 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
332 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
333 |
collide = false; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
334 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
335 |
else if (!wasUncontended) // CAS already known to fail |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
336 |
wasUncontended = true; // Continue after rehash |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
337 |
else if (a.cas(v = a.value, |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
338 |
((fn == null) ? |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
339 |
Double.doubleToRawLongBits |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
340 |
(Double.longBitsToDouble(v) + x) : |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
341 |
Double.doubleToRawLongBits |
16011
890a7ed97f6c
8004561: Additional functional interfaces, extension methods and name changes
mduigou
parents:
15283
diff
changeset
|
342 |
(fn.applyAsDouble |
15283
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
343 |
(Double.longBitsToDouble(v), x))))) |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
344 |
break; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
345 |
else if (n >= NCPU || cells != as) |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
346 |
collide = false; // At max size or stale |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
347 |
else if (!collide) |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
348 |
collide = true; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
349 |
else if (cellsBusy == 0 && casCellsBusy()) { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
350 |
try { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
351 |
if (cells == as) { // Expand table unless stale |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
352 |
Cell[] rs = new Cell[n << 1]; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
353 |
for (int i = 0; i < n; ++i) |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
354 |
rs[i] = as[i]; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
355 |
cells = rs; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
356 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
357 |
} finally { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
358 |
cellsBusy = 0; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
359 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
360 |
collide = false; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
361 |
continue; // Retry with expanded table |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
362 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
363 |
h = advanceProbe(h); |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
364 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
365 |
else if (cellsBusy == 0 && cells == as && casCellsBusy()) { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
366 |
boolean init = false; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
367 |
try { // Initialize table |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
368 |
if (cells == as) { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
369 |
Cell[] rs = new Cell[2]; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
370 |
rs[h & 1] = new Cell(Double.doubleToRawLongBits(x)); |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
371 |
cells = rs; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
372 |
init = true; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
373 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
374 |
} finally { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
375 |
cellsBusy = 0; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
376 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
377 |
if (init) |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
378 |
break; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
379 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
380 |
else if (casBase(v = base, |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
381 |
((fn == null) ? |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
382 |
Double.doubleToRawLongBits |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
383 |
(Double.longBitsToDouble(v) + x) : |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
384 |
Double.doubleToRawLongBits |
16011
890a7ed97f6c
8004561: Additional functional interfaces, extension methods and name changes
mduigou
parents:
15283
diff
changeset
|
385 |
(fn.applyAsDouble |
15283
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
386 |
(Double.longBitsToDouble(v), x))))) |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
387 |
break; // Fall back on using base |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
388 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
389 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
390 |
|
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
391 |
// Unsafe mechanics |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
392 |
private static final sun.misc.Unsafe UNSAFE; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
393 |
private static final long BASE; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
394 |
private static final long CELLSBUSY; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
395 |
private static final long PROBE; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
396 |
static { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
397 |
try { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
398 |
UNSAFE = sun.misc.Unsafe.getUnsafe(); |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
399 |
Class<?> sk = Striped64.class; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
400 |
BASE = UNSAFE.objectFieldOffset |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
401 |
(sk.getDeclaredField("base")); |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
402 |
CELLSBUSY = UNSAFE.objectFieldOffset |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
403 |
(sk.getDeclaredField("cellsBusy")); |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
404 |
Class<?> tk = Thread.class; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
405 |
PROBE = UNSAFE.objectFieldOffset |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
406 |
(tk.getDeclaredField("threadLocalRandomProbe")); |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
407 |
} catch (Exception e) { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
408 |
throw new Error(e); |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
409 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
410 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
411 |
|
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
412 |
} |