[io] reset previous value of `HDF5_USE_FILE_LOCKING`

tomoscan/io.py

@@ -67,6 +67,7 @@ class HDF5File(h5py.File):
                 kwargs["libver"] = "latest"
             if enable_file_locking is None:
                 enable_file_locking = mode != "r"
+            old_file_locking = os.environ.get("HDF5_USE_FILE_LOCKING", None)
             if enable_file_locking:
                 os.environ["HDF5_USE_FILE_LOCKING"] = "TRUE"
             else:
@@ -95,6 +96,10 @@ class HDF5File(h5py.File):
                 else:
                     kwargs["libver"] = libver
                 super().__init__(filename, mode=mode, swmr=swmr, **kwargs)
+            if old_file_locking is None:
+                del os.environ["HDF5_USE_FILE_LOCKING"]
+            else:
+                os.environ["HDF5_USE_FILE_LOCKING"] = old_file_locking
 
     @contextmanager
     def _protect_init(self, filename):