edu.rit.mp.buf

Class SharedDoubleArrayBuf

java.lang.Object

edu.rit.mp.Buf

edu.rit.mp.DoubleBuf

edu.rit.mp.buf.SharedDoubleArrayBuf

Direct Known Subclasses:

SharedDoubleArrayBuf_1

public class SharedDoubleArrayBuf
extends DoubleBuf

Class SharedDoubleArrayBuf provides a buffer for a multiple thread safe array of double items sent or received using the Message Protocol (MP). The array element stride may be 1 or greater than 1. While an instance of class SharedDoubleArrayBuf may be constructed directly, normally you will use a factory method in class DoubleBuf. See that class for further information.

Constructor Summary

Constructors

Constructor and Description
SharedDoubleArrayBuf(SharedDoubleArray theArray, Range theRange) Construct a new shared double array buffer.

Method Summary

Modifier and Type	Method and Description
double	get(int i) Obtain the given item from this buffer.
Buf	getReductionBuf(Op op) Create a buffer for performing parallel reduction using the given binary operation.
void	put(int i, double item) Store the given item in this buffer.

Methods inherited from class edu.rit.mp.DoubleBuf

buffer, buffer, buffer, buffer, buffer, buffer, colSliceBuffer, colSliceBuffers, copy, emptyBuffer, fill, getTemporaryBuf, patchBuffer, patchBuffers, rowSliceBuffer, rowSliceBuffers, sliceBuffer, sliceBuffer, sliceBuffers, sliceBuffers

Methods inherited from class edu.rit.mp.Buf

length

Methods inherited from class java.lang.Object

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

Constructor Detail

SharedDoubleArrayBuf

public SharedDoubleArrayBuf(SharedDoubleArray theArray,
                            Range theRange)

Construct a new shared double array buffer.

Parameters:

theArray - Shared array.

theRange - Range of array elements to include in the buffer.

Method Detail

get

public double get(int i)

Obtain the given item from this buffer.

The get() method must not block the calling thread; if it does, all message I/O in MP will be blocked.

Specified by:

get in class DoubleBuf

Parameters:

i - Item index in the range 0 .. length()-1.

Returns:

Item at index i.

put

public void put(int i,
                double item)

Store the given item in this buffer.

The put() method must not block the calling thread; if it does, all message I/O in MP will be blocked.

Specified by:

put in class DoubleBuf

Parameters:

i - Item index in the range 0 .. length()-1.

item - Item to be stored at index i.

getReductionBuf

public Buf getReductionBuf(Op op)

Create a buffer for performing parallel reduction using the given binary operation. The results of the reduction are placed into this buffer.

Specified by:

getReductionBuf in class Buf

Parameters:

op - Binary operation.

Throws:

java.lang.ClassCastException - (unchecked exception) Thrown if this buffer's element data type and the given binary operation's argument data type are not the same.