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MpmcAtomicArrayQueue.java
500 lines (455 loc) · 19.2 KB
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MpmcAtomicArrayQueue.java
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/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jctools.queues.atomic;
import org.jctools.util.PortableJvmInfo;
import org.jctools.util.RangeUtil;
import java.util.concurrent.atomic.AtomicLongFieldUpdater;
import java.util.concurrent.atomic.AtomicReferenceArray;
import java.util.concurrent.atomic.AtomicLongArray;
/**
* NOTE: This class was automatically generated by org.jctools.queues.atomic.JavaParsingAtomicArrayQueueGenerator
* which can found in the jctools-build module. The original source file is MpmcArrayQueue.java.
*/
abstract class MpmcAtomicArrayQueueL1Pad<E> extends SequencedAtomicReferenceArrayQueue<E> {
long p00, p01, p02, p03, p04, p05, p06, p07;
long p10, p11, p12, p13, p14, p15, p16;
MpmcAtomicArrayQueueL1Pad(int capacity) {
super(capacity);
}
}
/**
* NOTE: This class was automatically generated by org.jctools.queues.atomic.JavaParsingAtomicArrayQueueGenerator
* which can found in the jctools-build module. The original source file is MpmcArrayQueue.java.
*/
abstract class MpmcAtomicArrayQueueProducerIndexField<E> extends MpmcAtomicArrayQueueL1Pad<E> {
private static final AtomicLongFieldUpdater<MpmcAtomicArrayQueueProducerIndexField> P_INDEX_UPDATER = AtomicLongFieldUpdater.newUpdater(MpmcAtomicArrayQueueProducerIndexField.class, "producerIndex");
private volatile long producerIndex;
MpmcAtomicArrayQueueProducerIndexField(int capacity) {
super(capacity);
}
@Override
public final long lvProducerIndex() {
return producerIndex;
}
final boolean casProducerIndex(long expect, long newValue) {
return P_INDEX_UPDATER.compareAndSet(this, expect, newValue);
}
}
/**
* NOTE: This class was automatically generated by org.jctools.queues.atomic.JavaParsingAtomicArrayQueueGenerator
* which can found in the jctools-build module. The original source file is MpmcArrayQueue.java.
*/
abstract class MpmcAtomicArrayQueueL2Pad<E> extends MpmcAtomicArrayQueueProducerIndexField<E> {
long p01, p02, p03, p04, p05, p06, p07;
long p10, p11, p12, p13, p14, p15, p16, p17;
MpmcAtomicArrayQueueL2Pad(int capacity) {
super(capacity);
}
}
/**
* NOTE: This class was automatically generated by org.jctools.queues.atomic.JavaParsingAtomicArrayQueueGenerator
* which can found in the jctools-build module. The original source file is MpmcArrayQueue.java.
*/
abstract class MpmcAtomicArrayQueueConsumerIndexField<E> extends MpmcAtomicArrayQueueL2Pad<E> {
private static final AtomicLongFieldUpdater<MpmcAtomicArrayQueueConsumerIndexField> C_INDEX_UPDATER = AtomicLongFieldUpdater.newUpdater(MpmcAtomicArrayQueueConsumerIndexField.class, "consumerIndex");
private volatile long consumerIndex;
MpmcAtomicArrayQueueConsumerIndexField(int capacity) {
super(capacity);
}
@Override
public final long lvConsumerIndex() {
return consumerIndex;
}
final boolean casConsumerIndex(long expect, long newValue) {
return C_INDEX_UPDATER.compareAndSet(this, expect, newValue);
}
}
/**
* NOTE: This class was automatically generated by org.jctools.queues.atomic.JavaParsingAtomicArrayQueueGenerator
* which can found in the jctools-build module. The original source file is MpmcArrayQueue.java.
*/
abstract class MpmcAtomicArrayQueueL3Pad<E> extends MpmcAtomicArrayQueueConsumerIndexField<E> {
long p01, p02, p03, p04, p05, p06, p07;
long p10, p11, p12, p13, p14, p15, p16, p17;
MpmcAtomicArrayQueueL3Pad(int capacity) {
super(capacity);
}
}
/**
* NOTE: This class was automatically generated by org.jctools.queues.atomic.JavaParsingAtomicArrayQueueGenerator
* which can found in the jctools-build module. The original source file is MpmcArrayQueue.java.
* A Multi-Producer-Multi-Consumer queue based on a {@link org.jctools.queues.ConcurrentCircularArrayQueue}. This
* implies that any and all threads may call the offer/poll/peek methods and correctness is maintained. <br>
* This implementation follows patterns documented on the package level for False Sharing protection.<br>
* The algorithm for offer/poll is an adaptation of the one put forward by D. Vyukov (See <a
* href="http://www.1024cores.net/home/lock-free-algorithms/queues/bounded-mpmc-queue">here</a>). The original
* algorithm uses an array of structs which should offer nice locality properties but is sadly not possible in
* Java (waiting on Value Types or similar). The alternative explored here utilizes 2 arrays, one for each
* field of the struct. There is a further alternative in the experimental project which uses iteration phase
* markers to achieve the same algo and is closer structurally to the original, but sadly does not perform as
* well as this implementation.<br>
* <p>
* Tradeoffs to keep in mind:
* <ol>
* <li>Padding for false sharing: counter fields and queue fields are all padded as well as either side of
* both arrays. We are trading memory to avoid false sharing(active and passive).
* <li>2 arrays instead of one: The algorithm requires an extra array of longs matching the size of the
* elements array. This is doubling/tripling the memory allocated for the buffer.
* <li>Power of 2 capacity: Actual elements buffer (and sequence buffer) is the closest power of 2 larger or
* equal to the requested capacity.
* </ol>
*
* @param <E> type of the element stored in the {@link java.util.Queue}
*/
public class MpmcAtomicArrayQueue<E> extends MpmcAtomicArrayQueueL3Pad<E> {
public static final int MAX_LOOK_AHEAD_STEP = Integer.getInteger("jctools.mpmc.max.lookahead.step", 4096);
private final int lookAheadStep;
public MpmcAtomicArrayQueue(final int capacity) {
super(RangeUtil.checkGreaterThanOrEqual(capacity, 2, "capacity"));
lookAheadStep = Math.max(2, Math.min(capacity() / 4, MAX_LOOK_AHEAD_STEP));
}
@Override
public boolean offer(final E e) {
if (null == e) {
throw new NullPointerException();
}
final int mask = this.mask;
final long capacity = mask + 1;
final AtomicLongArray sBuffer = sequenceBuffer;
long pIndex;
int seqOffset;
long seq;
// start with bogus value, hope we don't need it
long cIndex = Long.MIN_VALUE;
do {
pIndex = lvProducerIndex();
seqOffset = calcSequenceOffset(pIndex, mask);
seq = lvSequence(sBuffer, seqOffset);
// consumer has not moved this seq forward, it's as last producer left
if (seq < pIndex) {
// Extra check required to ensure [Queue.offer == false iff queue is full]
if (// test against cached cIndex
pIndex - capacity >= cIndex && pIndex - capacity >= (cIndex = lvConsumerIndex())) {
// test against latest cIndex
return false;
} else {
// (+) hack to make it go around again without CAS
seq = pIndex + 1;
}
}
} while (// another producer has moved the sequence(or +)
seq > pIndex || // failed to increment
!casProducerIndex(pIndex, pIndex + 1));
soElement(buffer, calcElementOffset(pIndex, mask), e);
// seq++;
soSequence(sBuffer, seqOffset, pIndex + 1);
return true;
}
/**
* {@inheritDoc}
* <p>
* Because return null indicates queue is empty we cannot simply rely on next element visibility for poll
* and must test producer index when next element is not visible.
*/
@Override
public E poll() {
// local load of field to avoid repeated loads after volatile reads
final AtomicLongArray sBuffer = sequenceBuffer;
final int mask = this.mask;
long cIndex;
long seq;
int seqOffset;
long expectedSeq;
// start with bogus value, hope we don't need it
long pIndex = -1;
do {
cIndex = lvConsumerIndex();
seqOffset = calcSequenceOffset(cIndex, mask);
seq = lvSequence(sBuffer, seqOffset);
expectedSeq = cIndex + 1;
if (seq < expectedSeq) {
// slot has not been moved by producer
if (// test against cached pIndex
cIndex >= pIndex && cIndex == (pIndex = lvProducerIndex())) {
// strict empty check, this ensures [Queue.poll() == null iff isEmpty()]
return null;
} else {
// trip another go around
seq = expectedSeq + 1;
}
}
} while (// another consumer beat us to it
seq > expectedSeq || // failed the CAS
!casConsumerIndex(cIndex, cIndex + 1));
final int offset = calcElementOffset(cIndex, mask);
final E e = lpElement(buffer, offset);
soElement(buffer, offset, null);
// i.e. seq += capacity
soSequence(sBuffer, seqOffset, cIndex + mask + 1);
return e;
}
@Override
public E peek() {
long cIndex;
E e;
do {
cIndex = lvConsumerIndex();
// other consumers may have grabbed the element, or queue might be empty
e = lpElement(buffer, calcElementOffset(cIndex));
// only return null if queue is empty
} while (e == null && cIndex != lvProducerIndex());
return e;
}
@Override
public boolean relaxedOffer(E e) {
if (null == e) {
throw new NullPointerException();
}
final int mask = this.mask;
final AtomicLongArray sBuffer = sequenceBuffer;
long pIndex;
int seqOffset;
long seq;
do {
pIndex = lvProducerIndex();
seqOffset = calcSequenceOffset(pIndex, mask);
seq = lvSequence(sBuffer, seqOffset);
if (seq < pIndex) {
// slot not cleared by consumer yet
return false;
}
} while (// another producer has moved the sequence
seq > pIndex || // failed to increment
!casProducerIndex(pIndex, pIndex + 1));
soElement(buffer, calcElementOffset(pIndex, mask), e);
soSequence(sBuffer, seqOffset, pIndex + 1);
return true;
}
@Override
public E relaxedPoll() {
final AtomicLongArray sBuffer = sequenceBuffer;
final int mask = this.mask;
long cIndex;
int seqOffset;
long seq;
long expectedSeq;
do {
cIndex = lvConsumerIndex();
seqOffset = calcSequenceOffset(cIndex, mask);
seq = lvSequence(sBuffer, seqOffset);
expectedSeq = cIndex + 1;
if (seq < expectedSeq) {
return null;
}
} while (// another consumer beat us to it
seq > expectedSeq || // failed the CAS
!casConsumerIndex(cIndex, cIndex + 1));
final int offset = calcElementOffset(cIndex, mask);
final E e = lpElement(buffer, offset);
soElement(buffer, offset, null);
soSequence(sBuffer, seqOffset, cIndex + mask + 1);
return e;
}
@Override
public E relaxedPeek() {
long currConsumerIndex = lvConsumerIndex();
return lpElement(buffer, calcElementOffset(currConsumerIndex));
}
@Override
public int drain(Consumer<E> c) {
final int capacity = capacity();
int sum = 0;
while (sum < capacity) {
int drained = 0;
if ((drained = drain(c, PortableJvmInfo.RECOMENDED_POLL_BATCH)) == 0) {
break;
}
sum += drained;
}
return sum;
}
@Override
public int fill(Supplier<E> s) {
// result is a long because we want to have a safepoint check at regular intervals
long result = 0;
final int capacity = capacity();
do {
final int filled = fill(s, PortableJvmInfo.RECOMENDED_OFFER_BATCH);
if (filled == 0) {
return (int) result;
}
result += filled;
} while (result <= capacity);
return (int) result;
}
@Override
public int drain(Consumer<E> c, int limit) {
final AtomicLongArray sBuffer = sequenceBuffer;
final int mask = this.mask;
final AtomicReferenceArray<E> buffer = this.buffer;
final int maxLookAheadStep = Math.min(this.lookAheadStep, limit);
int consumed = 0;
while (consumed < limit) {
final int remaining = limit - consumed;
final int lookAheadStep = Math.min(remaining, maxLookAheadStep);
final long cIndex = lvConsumerIndex();
final long lookAheadIndex = cIndex + lookAheadStep - 1;
final int lookAheadSeqOffset = calcSequenceOffset(lookAheadIndex, mask);
final long lookAheadSeq = lvSequence(sBuffer, lookAheadSeqOffset);
final long expectedLookAheadSeq = lookAheadIndex + 1;
if (lookAheadSeq == expectedLookAheadSeq && casConsumerIndex(cIndex, expectedLookAheadSeq)) {
for (int i = 0; i < lookAheadStep; i++) {
final long index = cIndex + i;
final int seqOffset = calcSequenceOffset(index, mask);
final int offset = calcElementOffset(index, mask);
final long expectedSeq = index + 1;
while (lvSequence(sBuffer, seqOffset) != expectedSeq) {
}
final E e = lpElement(buffer, offset);
soElement(buffer, offset, null);
soSequence(sBuffer, seqOffset, index + mask + 1);
c.accept(e);
}
consumed += lookAheadStep;
} else {
if (lookAheadSeq < expectedLookAheadSeq) {
if (notAvailableYet(cIndex, mask, sBuffer, cIndex + 1)) {
return consumed;
}
}
return consumed + drainOneByOne(c, remaining);
}
}
return limit;
}
private int drainOneByOne(Consumer<E> c, int limit) {
final AtomicLongArray sBuffer = sequenceBuffer;
final int mask = this.mask;
final AtomicReferenceArray<E> buffer = this.buffer;
long cIndex;
int seqOffset;
long seq;
long expectedSeq;
for (int i = 0; i < limit; i++) {
do {
cIndex = lvConsumerIndex();
seqOffset = calcSequenceOffset(cIndex, mask);
seq = lvSequence(sBuffer, seqOffset);
expectedSeq = cIndex + 1;
if (seq < expectedSeq) {
return i;
}
} while (// another consumer beat us to it
seq > expectedSeq || // failed the CAS
!casConsumerIndex(cIndex, cIndex + 1));
final int offset = calcElementOffset(cIndex, mask);
final E e = lpElement(buffer, offset);
soElement(buffer, offset, null);
soSequence(sBuffer, seqOffset, cIndex + mask + 1);
c.accept(e);
}
return limit;
}
@Override
public int fill(Supplier<E> s, int limit) {
final AtomicLongArray sBuffer = sequenceBuffer;
final int mask = this.mask;
final AtomicReferenceArray<E> buffer = this.buffer;
final int maxLookAheadStep = Math.min(this.lookAheadStep, limit);
int produced = 0;
while (produced < limit) {
final int remaining = limit - produced;
final int lookAheadStep = Math.min(remaining, maxLookAheadStep);
final long pIndex = lvProducerIndex();
final long lookAheadIndex = pIndex + lookAheadStep - 1;
final int lookAheadSeqOffset = calcSequenceOffset(lookAheadIndex, mask);
final long lookAheadSeq = lvSequence(sBuffer, lookAheadSeqOffset);
final long expectedLookAheadSeq = lookAheadIndex;
if (lookAheadSeq == expectedLookAheadSeq && casProducerIndex(pIndex, expectedLookAheadSeq + 1)) {
for (int i = 0; i < lookAheadStep; i++) {
final long index = pIndex + i;
final int seqOffset = calcSequenceOffset(index, mask);
final int offset = calcElementOffset(index, mask);
while (lvSequence(sBuffer, seqOffset) != index) {
}
soElement(buffer, offset, s.get());
soSequence(sBuffer, seqOffset, index + 1);
}
produced += lookAheadStep;
} else {
if (lookAheadSeq < expectedLookAheadSeq) {
if (notAvailableYet(pIndex, mask, sBuffer, pIndex)) {
return produced;
}
}
return produced + fillOneByOne(s, remaining);
}
}
return limit;
}
private boolean notAvailableYet(long index, int mask, AtomicLongArray sBuffer, long expectedSeq) {
final int seqOffset = calcSequenceOffset(index, mask);
final long seq = lvSequence(sBuffer, seqOffset);
if (seq < expectedSeq) {
return true;
}
return false;
}
private int fillOneByOne(Supplier<E> s, int limit) {
final AtomicLongArray sBuffer = sequenceBuffer;
final int mask = this.mask;
final AtomicReferenceArray<E> buffer = this.buffer;
long pIndex;
int seqOffset;
long seq;
for (int i = 0; i < limit; i++) {
do {
pIndex = lvProducerIndex();
seqOffset = calcSequenceOffset(pIndex, mask);
seq = lvSequence(sBuffer, seqOffset);
if (seq < pIndex) {
// slot not cleared by consumer yet
return i;
}
} while (// another producer has moved the sequence
seq > pIndex || // failed to increment
!casProducerIndex(pIndex, pIndex + 1));
soElement(buffer, calcElementOffset(pIndex, mask), s.get());
soSequence(sBuffer, seqOffset, pIndex + 1);
}
return limit;
}
@Override
public void drain(Consumer<E> c, WaitStrategy w, ExitCondition exit) {
int idleCounter = 0;
while (exit.keepRunning()) {
if (drain(c, PortableJvmInfo.RECOMENDED_POLL_BATCH) == 0) {
idleCounter = w.idle(idleCounter);
continue;
}
idleCounter = 0;
}
}
@Override
public void fill(Supplier<E> s, WaitStrategy w, ExitCondition exit) {
int idleCounter = 0;
while (exit.keepRunning()) {
if (fill(s, PortableJvmInfo.RECOMENDED_OFFER_BATCH) == 0) {
idleCounter = w.idle(idleCounter);
continue;
}
idleCounter = 0;
}
}
}