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/*************************************************************************
* *
* Open Dynamics Engine, Copyright (C) 2001,2002 Russell L. Smith. *
* All rights reserved. Email: russ@q12.org Web: www.q12.org *
* *
* This library is free software; you can redistribute it and/or *
* modify it under the terms of EITHER: *
* (1) The GNU Lesser General Public License as published by the Free *
* Software Foundation; either version 2.1 of the License, or (at *
* your option) any later version. The text of the GNU Lesser *
* General Public License is included with this library in the *
* file LICENSE.TXT. *
* (2) The BSD-style license that is included with this library in *
* the file LICENSE-BSD.TXT. *
* *
* This library is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the files *
* LICENSE.TXT and LICENSE-BSD.TXT for more details. *
* *
*************************************************************************/
#ifndef _ODE_THREADINGUTILS_H_
#define _ODE_THREADINGUTILS_H_
#include "odeou.h"
#if !dTHREADING_INTF_DISABLED
static inline
bool ThrsafeCompareExchange(volatile atomicord32 *paoDestination, atomicord32 aoComparand, atomicord32 aoExchange)
{
return AtomicCompareExchange(paoDestination, aoComparand, aoExchange);
}
static inline
atomicord32 ThrsafeExchange(volatile atomicord32 *paoDestination, atomicord32 aoExchange)
{
return AtomicExchange(paoDestination, aoExchange);
}
static inline
void ThrsafeAdd(volatile atomicord32 *paoDestination, atomicord32 aoAddend)
{
AtomicExchangeAddNoResult(paoDestination, aoAddend);
}
static inline
atomicord32 ThrsafeExchangeAdd(volatile atomicord32 *paoDestination, atomicord32 aoAddend)
{
return AtomicExchangeAdd(paoDestination, aoAddend);
}
static inline
bool ThrsafeCompareExchangePointer(volatile atomicptr *papDestination, atomicptr apComparand, atomicptr apExchange)
{
return AtomicCompareExchangePointer(papDestination, apComparand, apExchange);
}
static inline
atomicptr ThrsafeExchangePointer(volatile atomicptr *papDestination, atomicptr apExchange)
{
return AtomicExchangePointer(papDestination, apExchange);
}
#else // #if dTHREADING_INTF_DISABLED
static inline
bool ThrsafeCompareExchange(volatile atomicord32 *paoDestination, atomicord32 aoComparand, atomicord32 aoExchange)
{
return (*paoDestination == aoComparand) ? ((*paoDestination = aoExchange), true) : false;
}
static inline
atomicord32 ThrsafeExchange(volatile atomicord32 *paoDestination, atomicord32 aoExchange)
{
atomicord32 aoDestinationValue = *paoDestination;
*paoDestination = aoExchange;
return aoDestinationValue;
}
static inline
void ThrsafeAdd(volatile atomicord32 *paoDestination, atomicord32 aoAddend)
{
*paoDestination += aoAddend;
}
static inline
atomicord32 ThrsafeExchangeAdd(volatile atomicord32 *paoDestination, atomicord32 aoAddend)
{
atomicord32 aoDestinationValue = *paoDestination;
*paoDestination += aoAddend;
return aoDestinationValue;
}
static inline
bool ThrsafeCompareExchangePointer(volatile atomicptr *papDestination, atomicptr apComparand, atomicptr apExchange)
{
return (*papDestination == apComparand) ? ((*papDestination = apExchange), true) : false;
}
static inline
atomicptr ThrsafeExchangePointer(volatile atomicptr *papDestination, atomicptr apExchange)
{
atomicptr apDestinationValue = *papDestination;
*papDestination = apExchange;
return apDestinationValue;
}
#endif // #if dTHREADING_INTF_DISABLED
static inline
unsigned int ThrsafeIncrementIntUpToLimit(volatile atomicord32 *storagePointer, unsigned int limitValue)
{
unsigned int resultValue;
while (true) {
resultValue = *storagePointer;
// The ">=" comparison is used here to allow continuing incrementing the destination
// without waiting for all the threads to pass the barrier of checking its value
if (resultValue >= limitValue) {
resultValue = limitValue;
break;
}
if (ThrsafeCompareExchange(storagePointer, (atomicord32)resultValue, (atomicord32)(resultValue + 1))) {
break;
}
}
return resultValue;
}
static inline
sizeint ThrsafeIncrementSizeUpToLimit(volatile sizeint *storagePointer, sizeint limitValue)
{
sizeint resultValue;
while (true) {
resultValue = *storagePointer;
// The ">=" comparison is not required here at present ("==" could be used).
// It is just used this way to match the other function above.
if (resultValue >= limitValue) {
resultValue = limitValue;
break;
}
if (ThrsafeCompareExchangePointer((volatile atomicptr *)storagePointer, (atomicptr)resultValue, (atomicptr)(resultValue + 1))) {
break;
}
}
return resultValue;
}
#endif // _ODE_THREADINGUTILS_H_
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