Package

org.sincron

atomic

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package atomic

A small toolkit of classes that support compare-and-swap semantics for mutation of variables.

On top of the JVM, this means dealing with lock-free thread-safe programming. On top of Javascript / Scala.js using Atomic references is still good because:

1. boxing values in a smart reference with nice helpers for transformations is always a good idea. 2. on the JVM there are times when synchronization, and when used for synchronization, atomic references can now cross compile to Scala.js 3. compareAndSet is actually a good idea to have even in an asynchronous, non-multi-threaded environment, such as Javascript, because it takes time into account and time related problems can happen even without multi-threading

The backbone of Atomic references is this method:

def compareAndSet(expect: T, update: T): Boolean

This method atomically sets a variable to the update value if it currently holds the expect value, reporting true on success or false on failure. The classes in this package also contain methods to get and unconditionally set values. In comparison with the JVM version, these Atomic references do not have methods for weakly setting values (i.e. weakCompareAndSet, lazySet), since those really make no sense in Javascript.

Building a reference is easy with the provided constructor, which will automatically return the most specific type needed:

val atomicNumber = Atomic(12L)

atomicNumber.incrementAndGet()

In comparison with java.util.concurrent.AtomicReference, these references implement common interfaces that you can use generically (i.e. Atomic[T], AtomicNumber[T]). And also provide useful helpers for atomically mutating of values (i.e. transform, transformAndGet, getAndTransform, etc...).

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Type Members

  1. trait Atomic[T] extends Any

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    Base trait of all atomic references, no matter the type.

  2. final class AtomicAny[T <: AnyRef] extends Atomic[T]

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  3. final class AtomicBoolean extends Atomic[Boolean]

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  4. trait AtomicBuilder[T, R <: Atomic[T]] extends AnyRef

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  5. final class AtomicByte extends AtomicNumber[Byte]

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  6. final class AtomicChar extends AtomicNumber[Char]

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  7. final class AtomicDouble extends AtomicNumber[Double]

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  8. final class AtomicFloat extends AtomicNumber[Float]

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  9. final class AtomicInt extends AtomicNumber[Int]

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  10. final class AtomicLong extends AtomicNumber[Long]

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  11. trait AtomicNumber[T] extends Atomic[T]

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    Represents an Atomic reference holding a number, providing helpers for easily incrementing and decrementing it.

    Represents an Atomic reference holding a number, providing helpers for easily incrementing and decrementing it.

    T

    should be something that's Numeric

  12. final class AtomicNumberAny[T <: AnyRef] extends AtomicNumber[T]

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  13. final class AtomicShort extends AtomicNumber[Short]

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  14. sealed trait PaddingStrategy extends AnyRef

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    For applying padding to atomic references, in order to reduce cache contention.

    For applying padding to atomic references, in order to reduce cache contention. JEP 142 should reduce the need for this along with the @Contended annotation, however that might have security restrictions, the runtime might not act on it since it's just a recommendation, plus it's nice to provide backwards compatibility.

    See: http://mail.openjdk.java.net/pipermail/hotspot-dev/2012-November/007309.html

    The default strategy is NoPadding. In order to apply padding, you can import an implicit into scope:

    import import org.sincron.atomic.Atomic
    import org.sincron.atomic.PaddingStrategy.Right64
    
    val paddedAtomic = Atomic(10)

Value Members

  1. object Atomic

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  2. object AtomicAny

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  3. object AtomicBoolean

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  4. object AtomicBuilder extends Level2

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  5. object AtomicByte

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  6. object AtomicChar

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  7. object AtomicDouble

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  8. object AtomicFloat

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  9. object AtomicInt

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  10. object AtomicLong

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  11. object AtomicNumberAny

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  12. object AtomicShort

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  13. object PaddingStrategy

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  14. package inline

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