114 lines
3.3 KiB
Java
114 lines
3.3 KiB
Java
//******************************************************************************
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//
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// File: GpuDoubleVbl.java
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// Package: edu.rit.gpu
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// Unit: Class edu.rit.gpu.GpuDoubleVbl
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//
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// This Java source file is copyright (C) 2014 by Alan Kaminsky. All rights
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// reserved. For further information, contact the author, Alan Kaminsky, at
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// ark@cs.rit.edu.
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//
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// This Java source file is part of the Parallel Java 2 Library ("PJ2"). PJ2 is
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// free software; you can redistribute it and/or modify it under the terms of
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// the GNU General Public License as published by the Free Software Foundation;
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// either version 3 of the License, or (at your option) any later version.
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//
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// PJ2 is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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//
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// A copy of the GNU General Public License is provided in the file gpl.txt. You
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// may also obtain a copy of the GNU General Public License on the World Wide
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// Web at http://www.gnu.org/licenses/gpl.html.
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//
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//******************************************************************************
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package edu.rit.gpu;
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/**
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* Class GpuDoubleVbl provides a double GPU variable. This is a variable of type
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* <TT>double</TT> stored in the GPU's memory and mirrored in the CPU's memory.
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* Class GpuDoubleVbl provides operations for copying the variable from the CPU
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* to the GPU or from the GPU to the CPU.
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* <P>
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* To use a double GPU variable:
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* <OL TYPE=1>
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* <P><LI>
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* Construct an instance of class GpuDoubleVbl by calling the {@link
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* Module#getDoubleVbl(String) getDoubleVbl()} method on a {@linkplain Module
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* Module} object.
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* <P><LI>
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* Set the {@link #item item} field to the desired value. Call the {@link
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* #hostToDev() hostToDev()} method to copy the variable from CPU memory to GPU
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* memory.
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* <P><LI>
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* Call the {@link #devToHost() devToHost()} method to copy the variable from
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* GPU memory to CPU memory. Examine the value of the {@link #item item} field.
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* </OL>
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*
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* @author Alan Kaminsky
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* @version 02-Apr-2014
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*/
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public class GpuDoubleVbl
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extends GpuVbl
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{
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// Exported data members.
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/**
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* The mirrored double variable in CPU memory.
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*/
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public double item;
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// Hidden data members.
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private double[] buf = new double [1];
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// Hidden constructors.
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/**
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* Construct a new statically allocated GPU double variable.
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*
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* @param gpu Gpu object.
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* @param dptr Pointer to variable in GPU memory.
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*
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* @exception GpuException
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* (unchecked exception) Thrown if a GPU error occurred.
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*/
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GpuDoubleVbl
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(Gpu gpu,
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long dptr)
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{
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super (gpu, 8L, dptr);
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}
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// Exported operations.
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/**
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* Copy this GPU variable from the host CPU's memory to the GPU device's
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* memory.
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*
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* @exception GpuException
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* (unchecked exception) Thrown if a GPU error occurred.
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*/
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public void hostToDev()
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{
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buf[0] = item;
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Cuda.cuMemcpyHtoD (gpu.ctx, dptr, 0, buf, 0, 1);
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}
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/**
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* Copy this GPU variable from the GPU device's memory to the host CPU's
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* memory.
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*
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* @exception GpuException
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* (unchecked exception) Thrown if a GPU error occurred.
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*/
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public void devToHost()
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{
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Cuda.cuMemcpyDtoH (gpu.ctx, buf, 0, dptr, 0, 1);
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item = buf[0];
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}
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}
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