From 5b65447e0f55917ae211be5b2336bbe2e9e1ab79 Mon Sep 17 00:00:00 2001
From: Daniel Schwen <daniel.schwen@inl.gov>
Date: Fri, 17 Nov 2023 09:33:02 -0700
Subject: [PATCH] Make node patch recovery threadsafe (#26053)

---
 framework/include/userobjects/NodalPatchRecoveryBase.h | 2 +-
 framework/src/userobjects/NodalPatchRecoveryBase.C     | 8 ++++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/framework/include/userobjects/NodalPatchRecoveryBase.h b/framework/include/userobjects/NodalPatchRecoveryBase.h
index 8b4c94f19740..7a89893a7358 100644
--- a/framework/include/userobjects/NodalPatchRecoveryBase.h
+++ b/framework/include/userobjects/NodalPatchRecoveryBase.h
@@ -31,8 +31,8 @@ class NodalPatchRecoveryBase : public ElementUserObject
 
   virtual void initialize() override;
   virtual void execute() override;
+  virtual void threadJoin(const UserObject &) override;
   virtual void finalize() override;
-  virtual void threadJoin(const UserObject &) override {}
 
 protected:
   /// Compute the quantity to recover using nodal patch recovery
diff --git a/framework/src/userobjects/NodalPatchRecoveryBase.C b/framework/src/userobjects/NodalPatchRecoveryBase.C
index f55f55fd07c3..e7bedbfd5723 100644
--- a/framework/src/userobjects/NodalPatchRecoveryBase.C
+++ b/framework/src/userobjects/NodalPatchRecoveryBase.C
@@ -116,6 +116,14 @@ NodalPatchRecoveryBase::execute()
   _be[elem_id] = be;
 }
 
+void
+NodalPatchRecoveryBase::threadJoin(const UserObject & uo)
+{
+  const auto & npr = static_cast<const NodalPatchRecoveryBase &>(uo);
+  _Ae.insert(npr._Ae.begin(), npr._Ae.end());
+  _be.insert(npr._be.begin(), npr._be.end());
+}
+
 void
 NodalPatchRecoveryBase::finalize()
 {