Package rx.internal.util.unsafe
Class MpscLinkedQueue<E>
java.lang.Object
java.util.AbstractCollection<E>
java.util.AbstractQueue<E>
rx.internal.util.unsafe.BaseLinkedQueuePad0<E>
rx.internal.util.unsafe.BaseLinkedQueueProducerNodeRef<E>
rx.internal.util.unsafe.BaseLinkedQueuePad1<E>
rx.internal.util.unsafe.BaseLinkedQueueConsumerNodeRef<E>
rx.internal.util.unsafe.BaseLinkedQueue<E>
rx.internal.util.unsafe.MpscLinkedQueue<E>
- Type Parameters:
E
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- All Implemented Interfaces:
Iterable<E>
,Collection<E>
,Queue<E>
This is a direct Java port of the MPSC algorithm as presented on 1024
Cores by D. Vyukov. The original has been adapted to Java and it's quirks with regards to memory model and
layout:
- Use inheritance to ensure no false sharing occurs between producer/consumer node reference fields.
- Use XCHG functionality to the best of the JDK ability (see differences in JDK7/8 impls).
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Field Summary
Fields inherited from class rx.internal.util.unsafe.BaseLinkedQueue
p00, p01, p02, p03, p04, p05, p06, p07, p30, p31, p32, p33, p34, p35, p36, p37
Fields inherited from class rx.internal.util.unsafe.BaseLinkedQueueConsumerNodeRef
C_NODE_OFFSET, consumerNode
Fields inherited from class rx.internal.util.unsafe.BaseLinkedQueueProducerNodeRef
P_NODE_OFFSET, producerNode
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionboolean
peek()
poll()
protected LinkedQueueNode
<E> xchgProducerNode
(LinkedQueueNode<E> newVal) Methods inherited from class rx.internal.util.unsafe.BaseLinkedQueue
isEmpty, iterator, size
Methods inherited from class rx.internal.util.unsafe.BaseLinkedQueueConsumerNodeRef
lpConsumerNode, lvConsumerNode, spConsumerNode
Methods inherited from class rx.internal.util.unsafe.BaseLinkedQueueProducerNodeRef
lpProducerNode, lvProducerNode, spProducerNode
Methods inherited from class java.util.AbstractCollection
contains, containsAll, remove, removeAll, retainAll, toArray, toArray, toString
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
Methods inherited from interface java.util.Collection
contains, containsAll, equals, hashCode, parallelStream, remove, removeAll, removeIf, retainAll, spliterator, stream, toArray, toArray, toArray
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Constructor Details
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MpscLinkedQueue
public MpscLinkedQueue()
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Method Details
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xchgProducerNode
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offer
IMPLEMENTATION NOTES:
Offer is allowed from multiple threads.
Offer allocates a new node and:- Swaps it atomically with current producer node (only one producer 'wins')
- Sets the new node as the node following from the swapped producer node
- See Also:
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poll
IMPLEMENTATION NOTES:
Poll is allowed from a SINGLE thread.
Poll reads the next node from the consumerNode and:- If it is null, the queue is assumed empty (though it might not be).
- If it is not null set it as the consumer node and return it's now evacuated value.
- See Also:
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peek
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