From d0f0cfed6abef88b98a0dca11ba679247c1a7e19 Mon Sep 17 00:00:00 2001
From: Fernando Pereira <fernando.pereira@epfl.ch>
Date: Tue, 29 Oct 2024 13:06:10 +0100
Subject: [PATCH] Intoduce a sentinel value to allow loading rebalanced files

---
 src/coreneuron/io/nrn_setup.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/coreneuron/io/nrn_setup.cpp b/src/coreneuron/io/nrn_setup.cpp
index 285c19034a..f198662615 100644
--- a/src/coreneuron/io/nrn_setup.cpp
+++ b/src/coreneuron/io/nrn_setup.cpp
@@ -216,6 +216,10 @@ void nrn_read_filesdat(int& ngrp, int*& grp, const char* filesdat) {
 
         nrn_assert(fscanf(fp, "%d\n", &iFile) == 1);
         if ((iNum % nrnmpi_numprocs) == nrnmpi_myid) {
+            if (iFile == -1) {
+                // Sentinel value, we are done for this rank
+                break;
+            }
             grp[ngrp] = iFile;
             ngrp++;
         }