Fix mutex lock issues (OCR and FR)

modules/ANSOCR/ANSCpuOCR.h

@@ -6,6 +6,9 @@
 #include "opencv2/imgproc.hpp"
 #include <iostream>
 #include <vector>
+#include <atomic>
+#include <chrono>
+#include <thread>
 #include "LabVIEWHeader/extcode.h"
 #include "ANSLicense.h"
 #include "ANSOCRBase.h"
@@ -25,8 +28,30 @@ namespace ANSCENTER {
 	private:
 		std::unique_ptr<PaddleOCR::PPOCR> ppocr = std::make_unique<PaddleOCR::PPOCR>();
 		std::mutex    _mutex;
+		std::atomic<bool> _modelLoading{ false };
 		cv::Mat _frameBuffer;  // Reusable buffer for color conversion
 
+		// Try to lock _mutex with a timeout for non-recursive mutex
+		std::unique_lock<std::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::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;
+		}
+
 	};
 }
 #endif