Category : Alternate Operating Systems - Quarterdeck DesqView, CP/M, etc
Archive   : PCCAPP.ZIP
Filename : UTIL.H

/*
* This file is part of the Choices Operating System
* Developed by: The TAPESTRY Parallel Computing Laboratory
* University of Illinois at Urbana-Champaign
* Department of Computer Science
* 1304 W. Springfield Ave.
* Urbana, IL 61801
*
* Copyright (c) 1987, 1988, 1989, 1990, 1991, 1992
* The University of Illinois Board of Trustees.
* All Rights Reserved.
*
* Author: Ruth A. Aydt ([email protected])
* Contributing Author: Lee Lup Yuen ([email protected])
* Project Manager and Principal Investigator: Roy Campbell ([email protected])
*
* Funded by: NSF TAPESTRY Grant No. 1-5-30035, NASA ICLASS Grant
* No. 1-5-25469 and No. NSG1471 and AT&T Metronet Grant No. 1-5-37411.
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for educational, research, and non-profit purposes
* is hereby granted provided that the above copyright notice, the
* original authors names, and this permission notice appear in all such
* copies and supporting documentation; that no charge be made for such
* copies; and that the name of the University of Illinois not be used
* in advertising or publicity pertaining to distribution of the
* software without specific prior written permission. Any entity
* desiring permission to incorporate this software into commercial
* products should contact the Computing Research Laboratory, Department
* of Computer Science, University of Illinois, 1304 W. Springfield
* Avenue, Urbana, IL 61801. The University of Illinois makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*/
/*
* Util.h: declarations for assembly-level routines we use with the
* 80386 machines.
*/

#ifndef Util_h
#define Util_h
#ifdef __GNUG__
#pragma once
#pragma interface
#endif

extern "C" {
// Copy nbytes from address "from" to address "to". Copying is done from
// low addresses to high addresses.
extern void CopyBlock(unsigned char *from, unsigned char *to, int nbytes);

// Write zeroes into nbytes bytes starting at address addr.
extern void ZeroBlock(char *addr, int nbytes);

// Set bit 0 of the lock atomically and return the previous value of the
// bit.
extern int testAndSet (short *lock);

// Reset bit 0 of the lock atomically and return the previous value of the
// bit.
extern int testAndReset (short *lock);
}
#endif Util_h