package sincron

  1. Public
  2. All

Value Members

  1. package atomic


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

    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)

    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...).