From e905ac9d331f0e39a14ca79fadbaed46137d16d3 Mon Sep 17 00:00:00 2001
From: Saumya Jain <saumya.jain@ultimaker.com>
Date: Thu, 7 Mar 2024 16:13:19 +0100
Subject: [PATCH] adding a lock for the create snapshot

CURA-11650
---
 plugins/3MFWriter/ThreeMFWriter.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/plugins/3MFWriter/ThreeMFWriter.py b/plugins/3MFWriter/ThreeMFWriter.py
index 1c14c37cfd..bf6378c4c4 100644
--- a/plugins/3MFWriter/ThreeMFWriter.py
+++ b/plugins/3MFWriter/ThreeMFWriter.py
@@ -2,6 +2,7 @@
 #  Cura is released under the terms of the LGPLv3 or higher.
 import json
 import re
+import threading
 
 from typing import Optional, cast, List, Dict, Pattern, Set
 
@@ -65,6 +66,7 @@ class ThreeMFWriter(MeshWriter):
         self._unit_matrix_string = ThreeMFWriter._convertMatrixToString(Matrix())
         self._archive: Optional[zipfile.ZipFile] = None
         self._store_archive = False
+        self._lock = threading.Lock()
 
     @staticmethod
     def _convertMatrixToString(matrix):
@@ -423,6 +425,7 @@ class ThreeMFWriter(MeshWriter):
     @call_on_qt_thread  # must be called from the main thread because of OpenGL
     def _createSnapshot(self):
         Logger.log("d", "Creating thumbnail image...")
+        self._lock.aquire()
         if not CuraApplication.getInstance().isVisible:
             Logger.log("w", "Can't create snapshot when renderer not initialized.")
             return None
@@ -431,6 +434,7 @@ class ThreeMFWriter(MeshWriter):
         except:
             Logger.logException("w", "Failed to create snapshot image")
             return None
+        finally: self._lock.release()
 
         return snapshot