/***
    Copyright (C) 2023-2024 J Reece Wilson (a/k/a "Reece"). All rights reserved.

    File: AuConditionVariable.Linux.hpp
    Date: 2023-8-11
    Author: Reece
***/
#pragma once

#if !defined(_AURUNTIME_GENERICCV)
#include "AuConditionMutex.Linux.hpp"

namespace Aurora::Threading::Primitives
{
    #pragma pack(push)
    #pragma pack(4)

    struct ConditionVariableLinux final
    {
        ConditionVariableLinux();
        ~ConditionVariableLinux();
        
        bool WaitForSignalNsEx(LinuxConditionMutex *pMutex, AuUInt64 timeout, bool bSpin = true);
        void Signal();
        void Broadcast();
        bool WaitOne(AuUInt64 qwTimeout, bool bSpin);

    private:
        bool TryTakeOneNoSpin();
        bool TryTakeOneSpin();

        AuUInt32 uState_ {};
        AuUInt32 uSleeping_ {};
    };
    #pragma pack(pop)

    using ConditionVariableInternal = ConditionVariableLinux;

    struct ConditionVariableImpl final : IConditionVariable
    {
        inline ConditionVariableImpl(const AuSPtr<IConditionMutex> &mutex) : 
            mutex(mutex)
        {
        }

        auline AuSPtr<IConditionMutex> GetMutex() override
        {
            return mutex;
        }

        auline bool WaitForSignal(AuUInt32 timeout) override
        {
            return cond.WaitForSignalNsEx(&std::static_pointer_cast<ConditionMutexImpl>(this->mutex)->mutex, AuMSToNS<AuUInt64>(timeout));
        }

        auline bool WaitForSignalNS(AuUInt64 qwTimeout) override
        {
            return cond.WaitForSignalNsEx(&std::static_pointer_cast<ConditionMutexImpl>(this->mutex)->mutex, qwTimeout);
        }

        inline bool WaitForSignalNsEx(const std::shared_ptr<LinuxConditionMutex> &pMutex, AuUInt64 timeout)
        {
            return cond.WaitForSignalNsEx(pMutex.get(), timeout);
        }

        auline void Signal() override
        {
            cond.Signal();
        }

        auline void Broadcast() override
        {
            cond.Broadcast();
        }

        ConditionVariableInternal cond;
        std::shared_ptr<IConditionMutex> mutex;
    };

    static const auto kSizeOfDummyCondVar = sizeof(ConditionVariableInternal);

}
#endif