added UseNativeDebugger which will pause the loading of LLM to help attaching c++ debugger. it will discard release dlls. ideally there will be just one dll compiled with debug enabled

Author: psocolovsky

Runtime/LLM.cs

@@ -36,6 +36,9 @@ public class LLM : MonoBehaviour
         /// <summary> log the output of the LLM in the Unity Editor. </summary>
         [Tooltip("log the output of the LLM in the Unity Editor.")]
         [LLM] public bool debug = false;
+        /// <summary> Wait for native debugger to connect to the backend </summary>
+        [Tooltip("Wait for native debugger to connect to the backend")]
+        [LLM] public bool UseNativeDebugger = false;
         /// <summary> number of prompts that can happen in parallel (-1 = number of LLMCaller objects) </summary>
         [Tooltip("number of prompts that can happen in parallel (-1 = number of LLMCaller objects)")]
         [LLMAdvanced] public int parallelPrompts = -1;
@@ -53,6 +56,8 @@ public class LLM : MonoBehaviour
         public bool started { get; protected set; } = false;
         /// <summary> Boolean set to true if the server has failed to start. </summary>
         public bool failed { get; protected set; } = false;
+        /// <summary> Boolean set to true if the server has been destroyed. </summary>
+        public bool destroyed { get; protected set; } = false;
         /// <summary> Boolean set to true if the models were not downloaded successfully. </summary>
         public static bool modelSetupFailed { get; protected set; } = false;
         /// <summary> Boolean set to true if the server has started and is ready to receive requests, false otherwise. </summary>
@@ -127,6 +132,13 @@ void OnValidate()
         public async void Awake()
         {
             if (!enabled) return;
+            _ = Task.Run(Load);
+        }
+
+        public async Awaitable Load()
+        {
+            await Awaitable.BackgroundThreadAsync();
+
 #if !UNITY_EDITOR
             modelSetupFailed = !await LLMManager.Setup();
 #endif
@@ -142,9 +154,13 @@ public async void Awake()
                 failed = true;
                 return;
             }
-            await Task.Run(() => StartLLMServer(arguments));
+            await StartLLMServerAsync(arguments);
             if (!started) return;
-            if (dontDestroyOnLoad) DontDestroyOnLoad(transform.root.gameObject);
+            if (dontDestroyOnLoad)
+            {
+                await Awaitable.MainThreadAsync();
+                DontDestroyOnLoad(transform.root.gameObject);
+            }
         }
 
         /// <summary>
@@ -476,10 +492,11 @@ private void StopLogging()
             DestroyStreamWrapper(logStreamWrapper);
         }
 
-        private void StartLLMServer(string arguments)
+        private async Task StartLLMServerAsync(string arguments)
         {
             started = false;
             failed = false;
+            destroyed = false;
             bool useGPU = numGPULayers > 0;
 
             foreach (string arch in LLMLib.PossibleArchitectures(useGPU))
@@ -488,6 +505,19 @@ private void StartLLMServer(string arguments)
                 try
                 {
                     InitLib(arch);
+#if UNITY_EDITOR
+                    if (UseNativeDebugger)
+                    {
+                        if (llmlib?.LLM_IsDebuggerAttached == null)
+                        {
+                            LLMUnitySetup.Log($"Tried architecture: {arch} is not debug library");
+                            Destroy();
+                            continue;
+                        }
+
+                        await WaitNativeDebug();
+                    }
+#endif
                     InitService(arguments);
                     LLMUnitySetup.Log($"Using architecture: {arch}");
                     break;
@@ -504,6 +534,7 @@ private void StartLLMServer(string arguments)
                 catch (Exception e)
                 {
                     error = $"{e.GetType()}: {e.Message}";
+                    Destroy();
                 }
                 LLMUnitySetup.Log($"Tried architecture: {arch}, error: " + error);
             }
@@ -514,20 +545,39 @@ private void StartLLMServer(string arguments)
                 return;
             }
             CallWithLock(StartService);
-            LLMUnitySetup.Log("LLM service created");
+            if (started)
+                LLMUnitySetup.Log("LLM service created");
         }
 
         private void InitLib(string arch)
         {
             llmlib = new LLMLib(arch);
-            CheckLLMStatus(false);
         }
 
+#if UNITY_EDITOR
+        private async Task WaitNativeDebug()
+        {
+            if (llmlib?.LLM_IsDebuggerAttached != null)
+            {
+                LLMUnitySetup.Log("waiting debugger");
+                while (!destroyed)
+                {
+                    if (llmlib.LLM_IsDebuggerAttached())
+                    {
+                        LLMUnitySetup.Log("remote debugger attached");
+                        break;
+                    }
+                    await Task.Delay(100);
+                }
+            }
+        }
+#endif
+
         void CallWithLock(EmptyCallback fn)
         {
             lock (startLock)
             {
-                if (llmlib == null) throw new DestroyException();
+                if (llmlib == null || destroyed) throw new DestroyException();
                 fn();
             }
         }
@@ -556,9 +606,12 @@ private void StartService()
         {
             llmThread = new Thread(() => llmlib.LLM_Start(LLMObject));
             llmThread.Start();
-            while (!llmlib.LLM_Started(LLMObject)) {}
-            ApplyLoras();
-            started = true;
+            while (!llmlib.LLM_Started(LLMObject) && !destroyed) { }
+            if (!destroyed)
+            {
+                ApplyLoras();
+                started = true;
+            }
         }
 
         /// <summary>
@@ -611,6 +664,7 @@ void AssertStarted()
             string error = null;
             if (failed) error = "LLM service couldn't be created";
             else if (!started) error = "LLM service not started";
+            else if (destroyed) error = "LLM service is being destroyed";
             if (error != null)
             {
                 LLMUnitySetup.LogError(error);
@@ -807,6 +861,7 @@ public void CancelRequest(int id_slot)
         /// </summary>
         public void Destroy()
         {
+            destroyed = true;
             lock (staticLock)
                 lock (startLock)
                 {

Runtime/LLMCaller.cs

@@ -238,6 +238,8 @@ protected virtual async Task<Ret> PostRequestLocal<Res, Ret>(string json, string
             // send a post request to the server and call the relevant callbacks to convert the received content and handle it
             // this function has streaming functionality i.e. handles the answer while it is being received
             while (!llm.failed && !llm.started) await Task.Yield();
+            if (llm.destroyed)
+                return default;
             string callResult = null;
             switch (endpoint)
             {

Runtime/LLMCharacter.cs

@@ -686,6 +686,8 @@ protected override async Task<Ret> PostRequestLocal<Res, Ret>(string json, strin
             if (endpoint != "completion") return await base.PostRequestLocal(json, endpoint, getContent, callback);
 
             while (!llm.failed && !llm.started) await Task.Yield();
+            if (llm.destroyed)
+                return default;
 
             string callResult = null;
             bool callbackCalled = false;

Runtime/LLMLib.cs

@@ -497,6 +497,12 @@ public LLMLib(string arch)
             StringWrapper_GetString = LibraryLoader.GetSymbolDelegate<StringWrapper_GetStringDelegate>(libraryHandle, "StringWrapper_GetString");
             Logging = LibraryLoader.GetSymbolDelegate<LoggingDelegate>(libraryHandle, "Logging");
             StopLogging = LibraryLoader.GetSymbolDelegate<StopLoggingDelegate>(libraryHandle, "StopLogging");
+
+            // editor only
+#if UNITY_EDITOR
+            var symbol = LibraryLoader.GetSymbol(libraryHandle, "LLM_IsDebuggerAttached");
+            LLM_IsDebuggerAttached = (symbol != IntPtr.Zero) ? Marshal.GetDelegateForFunctionPointer<LLM_IsDebuggerAttachedDelegate>(symbol) : null;
+#endif
         }
 
         /// <summary>
@@ -606,6 +612,9 @@ public static string GetArchitecturePath(string arch)
         public delegate void StringWrapper_DeleteDelegate(IntPtr instance);
         public delegate int StringWrapper_GetStringSizeDelegate(IntPtr instance);
         public delegate void StringWrapper_GetStringDelegate(IntPtr instance, IntPtr buffer, int bufferSize, bool clear = false);
+#if UNITY_EDITOR
+        public delegate bool LLM_IsDebuggerAttachedDelegate();
+#endif
 
         public LoggingDelegate Logging;
         public StopLoggingDelegate StopLogging;
@@ -631,6 +640,9 @@ public static string GetArchitecturePath(string arch)
         public StringWrapper_DeleteDelegate StringWrapper_Delete;
         public StringWrapper_GetStringSizeDelegate StringWrapper_GetStringSize;
         public StringWrapper_GetStringDelegate StringWrapper_GetString;
+#if UNITY_EDITOR
+        public LLM_IsDebuggerAttachedDelegate LLM_IsDebuggerAttached;
+#endif
 
 #endif