From 529eba18c78858541da934ecbd176dd97db339f7 Mon Sep 17 00:00:00 2001
From: Jamie Reece Wilson <me@reece.sx>
Date: Fri, 13 Oct 2023 21:43:59 +0100
Subject: [PATCH] [+] IAuroraThread::GetThreadCreationTime

---
 .../Threading/Threads/IAuroraThread.hpp       |  7 ++++
 Source/Threading/Threads/AuOSThread.cpp       | 32 +++++++++++++++++++
 Source/Threading/Threads/AuOSThread.hpp       |  5 +++
 3 files changed, 44 insertions(+)

diff --git a/Include/Aurora/Threading/Threads/IAuroraThread.hpp b/Include/Aurora/Threading/Threads/IAuroraThread.hpp
index 3e129868..51956c6f 100644
--- a/Include/Aurora/Threading/Threads/IAuroraThread.hpp
+++ b/Include/Aurora/Threading/Threads/IAuroraThread.hpp
@@ -17,6 +17,8 @@ namespace Aurora::HWInfo
     struct CpuBitId;
 }
 
+#include <Aurora/Time/EClock.hpp>
+
 namespace Aurora::Threading::Threads
 {
     struct TLSView;
@@ -52,6 +54,11 @@ namespace Aurora::Threading::Threads
         virtual HWInfo::CpuBitId  GetMask()                     = 0;
         virtual AuString          GetName()                     = 0;
         
+
+        virtual AuUInt64          GetThreadCreationTime(Time::EClock eClock) = 0;
+
+        // TODO: will deprecate with a  version that does call init on thread and deinit on deinit
+        //   ... just wait for it
         /// Registers a thread feature _not_ calling on init
         /// It is not possible for this lower level thread object to schedule an init call (defer to async)
         /// Use this to register teardown functions
diff --git a/Source/Threading/Threads/AuOSThread.cpp b/Source/Threading/Threads/AuOSThread.cpp
index 6ccd82ad..0f53c6e4 100644
--- a/Source/Threading/Threads/AuOSThread.cpp
+++ b/Source/Threading/Threads/AuOSThread.cpp
@@ -90,6 +90,8 @@ namespace Aurora::Threading::Threads
         this->terminateSignal_ = AuThreadPrimitives::EventShared(true, false, true);
 
         SysAssert(this->terminatedSignalLs_ && this->terminateSignalLs_ && this->terminated_ && this->terminateSignal_);
+
+        this->InitThreadCreateTime();
     }
 
     OSThread::OSThread() : info_(gDummyThreadInfo),
@@ -102,6 +104,8 @@ namespace Aurora::Threading::Threads
 
         SysAssert(this->terminated_ && this->terminateSignal_);
         this->bNotOwned = true;
+
+        this->InitThreadCreateTime();
     }
 
     OSThread::OSThread(AuUInt64 id) : info_(gDummyThreadInfo),
@@ -551,6 +555,32 @@ namespace Aurora::Threading::Threads
 
     void AttachSignalKiller();
 
+    void OSThread::InitThreadCreateTime()
+    {
+        uClockCreationTime[0] = AuTime::CurrentClockNS();
+        uClockCreationTime[1] = AuTime::SteadyClockNS();
+    }
+
+    AuUInt64 OSThread::GetThreadCreationTime(Time::EClock eClock)
+    {
+        if (AuTime::EClockIsValid(eClock))
+        {
+            SysPushErrorArg();
+            return {};
+        }
+
+        switch (eClock)
+        {
+        case Time::EClock::eWall:
+            return uClockCreationTime[0];
+        case Time::EClock::eSteady:
+            return uClockCreationTime[1];
+        default:
+            SysPushErrorArg();
+            return {};
+        }
+    }
+
     void OSThread::_ThreadEP()
     {
         // Poke TLS reference thread entity
@@ -577,6 +607,8 @@ namespace Aurora::Threading::Threads
         auto pA = this->terminatedSignalLs_;
         auto pB = this->terminated_;
 
+        this->InitThreadCreateTime();
+
         try
         {
             if (auto task = task_)
diff --git a/Source/Threading/Threads/AuOSThread.hpp b/Source/Threading/Threads/AuOSThread.hpp
index eac4a9dd..a400b0d9 100644
--- a/Source/Threading/Threads/AuOSThread.hpp
+++ b/Source/Threading/Threads/AuOSThread.hpp
@@ -47,6 +47,10 @@ namespace Aurora::Threading::Threads
 
         void              Detach()                      override;
 
+        AuUInt64          GetThreadCreationTime(Time::EClock eClock) override;
+
+        void InitThreadCreateTime();
+
         void _ThreadEP();
         AuSPtr<AuLoop::ILoopSource> AsLoopSource() override;
         AuSPtr<IWaitable> GetShutdownSignalWaitable() override;
@@ -108,6 +112,7 @@ namespace Aurora::Threading::Threads
         Primitives::CriticalSection exitOnlyOnce_;
         AuList<AuSPtr<IThreadFeature>> threadFeatures_;
         AuBinarySemaphore         epExecEvent;
+        AuUInt64                  uClockCreationTime[2] {};
 
         AuFunction<void()> task_;