AuroraRuntime/Include/Aurora/Threading/Waitables/BooleanWaitable.hpp

/***
    Copyright (C) 2021 J Reece Wilson (a/k/a "Reece"). All rights reserved.

    File: BooleanWaitable.hpp
    Date: 2021-6-10
    Author: Reece
***/
#pragma once

#include "../WakeOnAddress.hpp"

namespace Aurora::Threading::Waitables
{
    struct BooleanWaitable : IWaitable
    {
        inline BooleanWaitable(bool *pValue) : pValue_(pValue)
        { }

        inline BooleanWaitable(bool &refValue) : pValue_(&refValue)
        { }

        inline BooleanWaitable(std::atomic<bool> &value) : pValue_((bool *)&value)
        {
        }

        inline bool TryLock() override
        {
            return this->pValue_ ? *this->pValue_ : true;
        }

        inline bool HasOSHandle(AuMach &mach) override
        {
            return false;
        }

        inline bool HasLockImplementation() override
        {
            return true;
        }

        inline void Unlock() override
        {
            if (!this->pValue_)
            {
                return;
            }

            WakeOnAddress(this->pValue_);
        }

        inline void Lock() override
        {
            if (!this->pValue_)
            {
                return;
            }

            AuUInt8 uRef { 1 };
            WaitOnAddress(this->pValue_, &uRef, 1, 0);
        }

        inline bool LockMS(AuUInt64 qwTimeout) override
        {
            return LockNS(AuMSToNS<AuUInt64>(qwTimeout));
        }

        inline bool LockNS(AuUInt64 qwTimeout) override
        {
            AuUInt8 uRef { 1 };

            if (!this->pValue_)
            {
                return false;
            }

            return WaitOnAddress(this->pValue_, &uRef, 1, qwTimeout);
        }
        
    private:
        bool *pValue_ {};
    };
}