GteAtomicMinMax.h

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// David Eberly, Geometric Tools, Redmond WA 98052
// Copyright (c) 1998-2017
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
// File Version: 3.0.0 (2016/06/19)

#pragma once

#include <GTEngineDEF.h>
#include <algorithm>
#include <atomic>

// Implementations of atomic minimum and atomic maximum computations.  These
// are based on std::atomic_compare_exchange_strong.

namespace gte
{

template <typename T>
T AtomicMin(std::atomic<T>& v0, T const& v1);

template <typename T>
T AtomicMax(std::atomic<T>& v0, T const& v1);


template <typename T>
T AtomicMin(std::atomic<T>& v0, T const& v1)
{
    T vInitial, vMin;
    do
    {
        vInitial = v0;
        vMin = std::min(vInitial, v1);
    } while (!std::atomic_compare_exchange_strong(&v0, &vInitial, vMin));
    return vInitial;
}

template <typename T>
T AtomicMax(std::atomic<T>& v0, T const& v1)
{
    T vInitial, vMax;
    do
    {
        vInitial = v0;
        vMax = std::max(vInitial, v1);
    } while (!std::atomic_compare_exchange_strong(&v0, &vInitial, vMax));
    return vInitial;
}


}