saving workflows could run concurrently

src/est/core/split_monotonic.py

@@ -59,7 +59,12 @@ def split_bliss_scan(
 
         for subscan_number, subscan_slice in enumerate(subscan_slices, 1):
             out_url = _save_subscan(
-                nxentry_in, scan_number, subscan_number, out_filename, subscan_slice
+                nxentry_in,
+                scan_number,
+                subscan_number,
+                out_filename,
+                subscan_slice,
+                **retry_args,
             )
             out_urls.append(out_url)
     return out_urls
@@ -80,12 +85,15 @@ def _save_subscan(
     subscan_number: int,
     out_filename: str,
     subscan_slice: slice,
+    **retry_args,
 ) -> str:
     entry_name = f"{scan_number}.{subscan_number}"
     out_url = f"silx://{out_filename}::/{entry_name}"
 
     os.makedirs(os.path.dirname(out_filename), exist_ok=True)
-    with h5py.File(out_filename, mode="a", track_order=True) as nxroot_out:
+    with h5py_utils.open_item(
+        out_filename, "/", mode="a", track_order=True, **retry_args
+    ) as nxroot_out:
         if entry_name in nxroot_out:
             _logger.warning("%s::/%s already exists", out_filename, entry_name)
             return out_url