Fix model extract race issue to all classes

modules/ANSODEngine/ANSCUSTOMPY.cpp

@@ -343,6 +343,15 @@ if sys.stderr is None or not hasattr(sys.stderr, "write"):
             // Step 1: Base model init
             bool result = ANSODBase::Initialize(licenseKey, modelConfig, modelZipFilePath, modelZipPassword, labelMap);
             if (!result) return false;
+            // Serialize derived init against concurrent extract re-entries on the
+            // same folder. See ModelFolderLockGuard in ANSEngineCommon.h.
+            ModelFolderLockGuard _flg(_modelFolder, "ANSCUSTOMPY::Initialize");
+            if (!_flg.acquired()) {
+                this->_logger.LogError("ANSCUSTOMPY::Initialize",
+                    "Timed out waiting for model-folder lock: " + _modelFolder,
+                    __FILE__, __LINE__);
+                return false;
+            }
 
             _modelConfig = modelConfig;
             _modelConfig.inpHeight = 640;