Fix mutex lock issues (OCR and FR)

modules/ANSODEngine/ANSEngineCommon.h

@@ -1046,6 +1046,46 @@ namespace ANSCENTER
         MoveDetectsHandler          _handler;
         const size_t     QUEUE_SIZE = 10;
         std::recursive_mutex	    _mutex;
+        std::atomic<bool>           _modelLoading{ false };
+
+        // Pre-inference gate for ANSFDBase subclasses
+        bool PreInferenceCheck(const char* caller) {
+            if (_modelLoading.load()) return false;
+            auto lk = TryLockWithTimeout(caller);
+            if (!lk.owns_lock()) return false;
+            if (!_licenseValid || !_isInitialized)
+                return false;
+            return true;
+        }
+
+        struct ModelLoadingGuard {
+            std::atomic<bool>& flag;
+            explicit ModelLoadingGuard(std::atomic<bool>& f) : flag(f) { flag.store(true); }
+            ~ModelLoadingGuard() { flag.store(false); }
+            ModelLoadingGuard(const ModelLoadingGuard&) = delete;
+            ModelLoadingGuard& operator=(const ModelLoadingGuard&) = delete;
+        };
+
+        std::unique_lock<std::recursive_mutex> TryLockWithTimeout(
+                const char* caller, unsigned int timeoutMs = 5000)
+        {
+            const auto deadline = std::chrono::steady_clock::now()
+                                + std::chrono::milliseconds(timeoutMs);
+            std::unique_lock<std::recursive_mutex> lk(_mutex, std::defer_lock);
+            while (!lk.try_lock()) {
+                if (std::chrono::steady_clock::now() >= deadline) {
+                    _logger.LogWarn(caller,
+                        "Mutex acquisition timed out after "
+                        + std::to_string(timeoutMs) + " ms"
+                        + (_modelLoading.load() ? " (model loading in progress)" : ""),
+                        __FILE__, __LINE__);
+                    return lk;
+                }
+                std::this_thread::sleep_for(std::chrono::milliseconds(1));
+            }
+            return lk;
+        }
+
         ANSCENTER::EngineType	    engineType;
 
         bool                        _facelivenessEngineValid{ false };