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/*************************************************************************
* *
* Open Dynamics Engine, Copyright (C) 2001-2003 Russell L. Smith. *
* All rights reserved. Email: russ@q12.org Web: www.q12.org *
* *
* Threading atomics providers file. *
* Copyright (C) 2011-2019 Oleh Derevenko. All rights reserved. *
* e-mail: odar@eleks.com (change all "a" to "e") *
* *
* 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. *
* *
*************************************************************************/
/*
* Fake atomics provider for built-in threading support provider.
* OU-based atomics provider for built-in threading support provider.
*
* The classes have been moved into a separate header as they are to be used
* in both WIN and POSIX implementations.
*/
#ifndef _ODE_THREADING_ATOMICS_PROVS_H_
#define _ODE_THREADING_ATOMICS_PROVS_H_
#include <ode/odeconfig.h>
#include <ode/error.h>
/************************************************************************/
/* Fake atomics provider class implementation */
/************************************************************************/
class dxFakeAtomicsProvider
{
public:
typedef unsigned long atomicord_t;
typedef void *atomicptr_t;
public:
static void IncrementTargetNoRet(volatile atomicord_t *value_accumulator_ptr)
{
++(*value_accumulator_ptr);
}
static void DecrementTargetNoRet(volatile atomicord_t *value_accumulator_ptr)
{
--(*value_accumulator_ptr);
}
static atomicord_t QueryTargetValue(volatile atomicord_t *value_storage_ptr)
{
return *value_storage_ptr;
}
template<unsigned type_size>
static sizeint AddValueToTarget(volatile void *value_accumulator_ptr, diffint value_addend);
static bool CompareExchangeTargetPtr(volatile atomicptr_t *pointer_storage_ptr,
atomicptr_t comparand_value, atomicptr_t new_value)
{
bool exchange_result = false;
atomicptr_t original_value = *pointer_storage_ptr;
if (original_value == comparand_value)
{
*pointer_storage_ptr = new_value;
exchange_result = true;
}
return exchange_result;
}
};
template<>
inline sizeint dxFakeAtomicsProvider::AddValueToTarget<sizeof(dxFakeAtomicsProvider::atomicord_t)>(volatile void *value_accumulator_ptr, diffint value_addend)
{
atomicord_t original_value = *(volatile atomicord_t *)value_accumulator_ptr;
*(volatile atomicord_t *)value_accumulator_ptr = original_value + (atomicord_t)value_addend;
return original_value;
}
template<>
inline sizeint dxFakeAtomicsProvider::AddValueToTarget<2 * sizeof(dxFakeAtomicsProvider::atomicord_t)>(volatile void *value_accumulator_ptr, diffint value_addend)
{
atomicptr_t original_value = *(volatile atomicptr_t *)value_accumulator_ptr;
*(volatile atomicptr_t *)value_accumulator_ptr = (atomicptr_t)((sizeint)original_value + (sizeint)value_addend);
return (sizeint)original_value;
}
#if dBUILTIN_THREADING_IMPL_ENABLED
/************************************************************************/
/* dxOUAtomicsProvider class implementation */
/************************************************************************/
#if !dOU_ENABLED
#error OU library must be enabled for this to compile
#elif !dATOMICS_ENABLED
#error OU Atomics must be enabled for this to compile
#endif
#include "odeou.h"
class dxOUAtomicsProvider
{
public:
typedef _OU_NAMESPACE::atomicord32 atomicord_t;
typedef _OU_NAMESPACE::atomicptr atomicptr_t;
public:
static void IncrementTargetNoRet(volatile atomicord_t *value_accumulator_ptr)
{
_OU_NAMESPACE::AtomicIncrementNoResult(value_accumulator_ptr);
}
static void DecrementTargetNoRet(volatile atomicord_t *value_accumulator_ptr)
{
_OU_NAMESPACE::AtomicDecrementNoResult(value_accumulator_ptr);
}
static atomicord_t QueryTargetValue(volatile atomicord_t *value_storage_ptr)
{
// Query value with memory barrier before
atomicord_t result_value = *value_storage_ptr;
if (!_OU_NAMESPACE::AtomicCompareExchange(value_storage_ptr, result_value, result_value))
{
result_value = *value_storage_ptr;
}
return result_value;
}
template<unsigned type_size>
static sizeint AddValueToTarget(volatile void *value_accumulator_ptr, diffint value_addend);
static bool CompareExchangeTargetPtr(volatile atomicptr_t *pointer_storage_ptr,
atomicptr_t comparand_value, atomicptr_t new_value)
{
return _OU_NAMESPACE::AtomicCompareExchangePointer(pointer_storage_ptr, comparand_value, new_value);
}
};
template<>
inline sizeint dxOUAtomicsProvider::AddValueToTarget<sizeof(dxOUAtomicsProvider::atomicord_t)>(volatile void *value_accumulator_ptr, diffint value_addend)
{
return _OU_NAMESPACE::AtomicExchangeAdd((volatile atomicord_t *)value_accumulator_ptr, (atomicord_t)value_addend);
}
template<>
inline sizeint dxOUAtomicsProvider::AddValueToTarget<2 * sizeof(dxOUAtomicsProvider::atomicord_t)>(volatile void *value_accumulator_ptr, diffint value_addend)
{
atomicptr_t original_value;
while (true)
{
original_value = *(volatile atomicptr_t *)value_accumulator_ptr;
atomicptr_t new_value = (atomicptr_t)((sizeint)original_value + (sizeint)value_addend);
if (_OU_NAMESPACE::AtomicCompareExchangePointer((volatile atomicptr_t *)value_accumulator_ptr, original_value, new_value))
{
break;
}
}
return (sizeint)original_value;
}
#endif // #if dBUILTIN_THREADING_IMPL_ENABLED
#endif // #ifndef _ODE_THREADING_ATOMICS_PROVS_H_
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