AuroraRuntime/Source/Threading/Primitives/AuWoASemaphore.Unix.hpp

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

    File: AuWoASemaphore.Unix.hpp
    Date: 2021-6-12
    Date: 2023-12-29
    Author: Reece
    Note: Implements the basic primitives for use when the generic WoA implementations of thread primitives are incorporated into a given target platform
          (Win9x - NT 2000 + Xbox [360] kernel objects, iOS/libdispatch semaphores, Nintendo Switch (NX semaphores), PlayStation X (kqueue yielding or not-pthread ~p~sceThreads perhaps?), etc) 
***/
#pragma once

namespace Aurora::Threading::Primitives
{
    // Moved from ./AuConditionMutex.Unix.[c/h]pp
    // now ./_removed/AuConditionMutex.Unix.[c/h]pp.bak
    struct WoAConditionMutex final
    {
        WoAConditionMutex();
        ~WoAConditionMutex();

        bool TryLock();
        void Lock();
        void Unlock();
        AuUInt GetOSHandle();

        inline WoAConditionMutex *operator ->()
        {
            return this;
        }

    private:
        pthread_mutex_t value_;
    };
    
    struct WoAConditionVariable final
    {
        WoAConditionVariable();
        ~WoAConditionVariable();

        bool WaitForSignalNsEx(WoAConditionMutex *pMutex,
                               AuUInt64 qwTimeout,
                               bool bSpin = true);
        void Signal();
        void Broadcast();

        inline WoAConditionVariable *operator ->()
        {
            return this;
        }
    private:
        friend struct WoAConditionMutex;
        pthread_cond_t pthreadCv_;
    };

    struct WoASemaphoreImpl final
    {
        WoASemaphoreImpl(AuUInt16 intialValue = 0);
        ~WoASemaphoreImpl();

        bool HasOSHandle(AuMach &mach);
        bool HasLockImplementation();
        auline bool TryLockNoSpin();
        bool TryLock() override;
        bool LockMS(AuUInt64 timeout);
        bool LockNS(AuUInt64 timeout);
        void Lock();
        void Unlock(AuUInt16 count); 
        void Unlock();

        inline WoASemaphoreImpl *operator ->()
        {
            return this;
        }
    private:
        AuInt32 value_ {};
        WoAConditionMutex mutex_;
        WoAConditionVariable cond_;
    };
}