AuroraRuntime/Source/Threading/Primitives/AuEvent.hpp

/***
    Copyright (C) 2021-2024 J Reece Wilson (a/k/a "Reece"). All rights reserved.

    File: AuEvent.hpp
    Date: 2021-6-12
    Author: Reece
***/
#pragma once

#include "AuConditionVariable.Generic.hpp"
#include "AuConditionMutex.Generic.hpp"

namespace Aurora::Threading::Primitives
{
    struct EventImpl final : IEvent
    {
        EventImpl(bool bTriggered, bool bAtomicRelease, bool bPermitMultipleTriggers);
        ~EventImpl();

        bool Init();
        bool LockMS(AuUInt64 timeout /*=0*/) override;
        bool LockNS(AuUInt64 timeout /*=0*/) override;
        bool LockAbsNS(AuUInt64 timeout /*=0*/) override;
        bool TryLock() override;
        void Reset() override;
        void Set() override;
        bool TrySet() override;
        bool HasOSHandle(AuMach &mach) override;
        bool HasLockImplementation() override;
        void Lock() override;
        void Unlock() override;
        auline AuUInt32 *GetSleepCounter();

    private:
        bool AtomicIsEventSetLogicNoSpinNoLock();

        ConditionMutexInternal mutex_; // must come first
        ConditionVariableInternal condition_;

    #if 0
        const bool bAtomicRelease_ {};
        const bool bPermitMultipleTriggers_ {};
        bool bTriggered_ {};
    #else

        union EventBits
        {
            struct
            {
                AuUInt8 bAtomicRelease : 1;
                AuUInt8 bPermitMultipleTriggers : 1;
                AuUInt8 bTriggered : 1;
            };
            AuUInt32 state;
        };

        union
        {
            struct
            {
                AuUInt8 bAtomicRelease_ : 1;
                AuUInt8 bPermitMultipleTriggers_ : 1;
                AuUInt8 bTriggered_ : 1;
            };

            AuUInt32 state_;
        };


        void DoSignal(const EventBits &bits);
    #endif
    };
}