Documentation of 'edu.rit.pj.reduction.SharedDouble' Java class
SharedDouble
Skip navigation links
edu.rit.pj.reduction

Class SharedDouble

  • All Implemented Interfaces:
    java.io.Serializable

    public class SharedDouble
extends java.lang.Number
    Class SharedDouble provides a reduction variable for a value of type double.

    Class SharedDouble is multiple thread safe. The methods use lock-free atomic compare-and-set.

    Note: Class SharedDouble is implemented using class java.util.concurrent.atomic.AtomicLong. The double value is stored as a long whose bit pattern is the same as the double value.

    See Also:
    Serialized Form

    • Constructor Summary

      Constructors 
      Constructor and Description
      SharedDouble()
      Construct a new double reduction variable with the initial value 0.
      SharedDouble(double initialValue)
      Construct a new double reduction variable with the given initial value.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method and Description
      double addAndGet(double value)
      Add the given value to this reduction variable and return the new value.
      boolean compareAndSet(double expect, double update)
      Atomically set this reduction variable to the given updated value if the current value equals the expected value.
      double decrementAndGet()
      Subtract one from this reduction variable and return the new value.
      double doubleValue()
      Returns this reduction variable's current value converted to type double.
      float floatValue()
      Returns this reduction variable's current value converted to type float.
      double get()
      Returns this reduction variable's current value.
      double getAndAdd(double value)
      Add the given value to this reduction variable and return the previous value.
      double getAndDecrement()
      Subtract one from this reduction variable and return the previous value.
      double getAndIncrement()
      Add one to this reduction variable and return the previous value.
      double getAndSet(double value)
      Set this reduction variable to the given value and return the previous value.
      double incrementAndGet()
      Add one to this reduction variable and return the new value.
      int intValue()
      Returns this reduction variable's current value converted to type int.
      long longValue()
      Returns this reduction variable's current value converted to type long.
      double reduce(double value, DoubleOp op)
      Combine this reduction variable with the given value using the given operation.
      void set(double value)
      Set this reduction variable to the given value.
      java.lang.String toString()
      Returns a string version of this reduction variable.
      boolean weakCompareAndSet(double expect, double update)
      Atomically set this reduction variable to the given updated value if the current value equals the expected value.

      • Methods inherited from class java.lang.Number

        byteValue, shortValue

      • Methods inherited from class java.lang.Object

        equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

    • Constructor Detail

      • SharedDouble

        public SharedDouble()
        Construct a new double reduction variable with the initial value 0.

      • SharedDouble

        public SharedDouble(double initialValue)
        Construct a new double reduction variable with the given initial value.
        Parameters:
        initialValue - Initial value.

    • Method Detail

      • get

        public double get()
        Returns this reduction variable's current value.
        Returns:
        Current value.

      • set

        public void set(double value)
        Set this reduction variable to the given value.
        Parameters:
        value - New value.

      • getAndSet

        public double getAndSet(double value)
        Set this reduction variable to the given value and return the previous value.
        Parameters:
        value - New value.
        Returns:
        Previous value.

      • compareAndSet

        public boolean compareAndSet(double expect,
                             double update)
        Atomically set this reduction variable to the given updated value if the current value equals the expected value.
        Parameters:
        expect - Expected value.
        update - Updated value.
        Returns:
        True if the update happened, false otherwise.

      • weakCompareAndSet

        public boolean weakCompareAndSet(double expect,
                                 double update)
        Atomically set this reduction variable to the given updated value if the current value equals the expected value. May fail spuriously.
        Parameters:
        expect - Expected value.
        update - Updated value.
        Returns:
        True if the update happened, false otherwise.

      • getAndIncrement

        public double getAndIncrement()
        Add one to this reduction variable and return the previous value.
        Returns:
        Previous value.

      • getAndDecrement

        public double getAndDecrement()
        Subtract one from this reduction variable and return the previous value.
        Returns:
        Previous value.

      • getAndAdd

        public double getAndAdd(double value)
        Add the given value to this reduction variable and return the previous value.
        Parameters:
        value - Value to add.
        Returns:
        Previous value.

      • incrementAndGet

        public double incrementAndGet()
        Add one to this reduction variable and return the new value.
        Returns:
        New value.

      • decrementAndGet

        public double decrementAndGet()
        Subtract one from this reduction variable and return the new value.
        Returns:
        New value.

      • addAndGet

        public double addAndGet(double value)
        Add the given value to this reduction variable and return the new value.
        Parameters:
        value - Value to add.
        Returns:
        New value.

      • reduce

        public double reduce(double value,
                     DoubleOp op)
        Combine this reduction variable with the given value using the given operation. The result is stored back into this reduction variable and is returned.
        Parameters:
        value - Value.
        op - Binary operation.
        Returns:
        (This variable) op (value).

      • toString

        public java.lang.String toString()
        Returns a string version of this reduction variable.
        Overrides:
        toString in class java.lang.Object
        Returns:
        String version.

      • intValue

        public int intValue()
        Returns this reduction variable's current value converted to type int.
        Specified by:
        intValue in class java.lang.Number
        Returns:
        Current value.

      • longValue

        public long longValue()
        Returns this reduction variable's current value converted to type long.
        Specified by:
        longValue in class java.lang.Number
        Returns:
        Current value.

      • floatValue

        public float floatValue()
        Returns this reduction variable's current value converted to type float.
        Specified by:
        floatValue in class java.lang.Number
        Returns:
        Current value.

      • doubleValue

        public double doubleValue()
        Returns this reduction variable's current value converted to type double.
        Specified by:
        doubleValue in class java.lang.Number
        Returns:
        Current value.
Skip navigation links

DMelt 3.0 © DataMelt by jWork.ORG

You see the box below because you did not login.