From cae8577c855b6c93f182db90d4db4da5b753c4eb Mon Sep 17 00:00:00 2001
From: leonarski_f <filip.leonarski@psi.ch>
Date: Tue, 5 May 2026 16:04:35 +0200
Subject: [PATCH] HDF5: Use strong file close FAPL

---
 writer/HDF5Objects.cpp | 6 ++++++
 writer/HDF5Objects.h   | 1 +
 2 files changed, 7 insertions(+)

diff --git a/writer/HDF5Objects.cpp b/writer/HDF5Objects.cpp
index 616a5d6d..e5314c40 100644
--- a/writer/HDF5Objects.cpp
+++ b/writer/HDF5Objects.cpp
@@ -348,6 +348,10 @@ void HDF5Fapl::SetVersionTo1p10orNewer() {
     H5Pset_libver_bounds(id, H5F_LIBVER_V110, H5F_LIBVER_LATEST);
 }
 
+void HDF5Fapl::SetCloseStrong() {
+    H5Pset_fclose_degree(id, H5F_CLOSE_STRONG);
+}
+
 template <typename T>
 static HDF5Object& WriteOrCreateScalarAttr(HDF5Object& object, const std::string& name, const T& val) {
     HDF5DataSpace dataspace(HDF5DataSpace::Scalar);
@@ -731,6 +735,8 @@ HDF5File::HDF5File(const std::string& filename, bool v1_10) : HDF5Object() {
 
     if (v1_10)
         fapl.SetVersionTo1p10orNewer();
+    fapl.SetCloseStrong();
+
     id = H5Fcreate(filename.c_str(), H5F_ACC_TRUNC, H5P_DEFAULT, fapl.GetID());
     if (id < 0)
         throw JFJochException(JFJochExceptionCategory::HDF5, "Cannot open/create data HDF5 file " + filename);
diff --git a/writer/HDF5Objects.h b/writer/HDF5Objects.h
index 0408fbe5..eea8ded9 100644
--- a/writer/HDF5Objects.h
+++ b/writer/HDF5Objects.h
@@ -123,6 +123,7 @@ public:
     HDF5Fapl();
     ~HDF5Fapl();
     void SetVersionTo1p10orNewer();
+    void SetCloseStrong();
 };
 
 class HDF5Object : public HDF5Id {