AuroraRuntime/Source/Process/AuProcessStartTime.cpp

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

    File: AuProcessStartTime.cpp
    Date: 2023-7-10
    Author: Reece
***/
#include <Source/RuntimeInternal.hpp>
#include "AuProcessStartTime.hpp"
#include <Time/Time.hpp>

namespace Aurora::Process
{
    static AuOptional<AuUInt64> gOptKnownStartupWallTime;
    static AuOptional<AuUInt64> gOptKnownStartupSteadyTime;

    void WarmStartupCaches()
    {
    #if defined(AURORA_IS_MODERNNT_DERIVED)
        FILETIME creation, exit, kernel, user;
        if (::GetProcessTimes(GetCurrentProcess(), &creation, &exit, &kernel, &user))
        {
            auto u64 = AuTime::ConvertTimestampNs(creation);
            gOptKnownStartupWallTime = u64;
            u64 += AuTime::SteadyClockNS() - AuTime::CurrentClockNS();
            gOptKnownStartupSteadyTime = u64;
        }
    #else
        auto u64 = AuTime::ThreadClockNS();
        gOptKnownStartupWallTime = AuTime::CurrentClockNS() - u64;
        gOptKnownStartupSteadyTime = AuTime::SteadyClockNS() - u64;
    #endif
    }

    AUKN_SYM AuUInt64 GetProcessStartupTimeNS()
    {
        if (gOptKnownStartupWallTime.has_value())
        {
            return gOptKnownStartupWallTime.value();
        }

        WarmStartupCaches();

        return gOptKnownStartupWallTime.value();
    }

    AUKN_SYM AuUInt64 GetProcessStartupTimeMS()
    {
        return AuNSToMS<AuUInt64>(GetProcessStartupTimeNS());
    }

    AUKN_SYM AuUInt64 GetProcessStartupSteadyTimeNS()
    {
        if (gOptKnownStartupSteadyTime.has_value())
        {
            return gOptKnownStartupSteadyTime.value();
        }

        WarmStartupCaches();

        return gOptKnownStartupSteadyTime.value();
    }
}