From 5b47df30141663123e1df39ab2c3831bdce72c52 Mon Sep 17 00:00:00 2001
From: Dennis Klein <d.klein@gsi.de>
Date: Wed, 28 Aug 2019 20:22:48 +0200
Subject: [PATCH] SDK: Fix race condition which lead to frequent segfaults on
 destruction

---
 fairmq/sdk/Topology.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fairmq/sdk/Topology.h b/fairmq/sdk/Topology.h
index 0068f006..6020f82f 100644
--- a/fairmq/sdk/Topology.h
+++ b/fairmq/sdk/Topology.h
@@ -183,6 +183,7 @@ class BasicTopology : public AsioBase<Executor, Allocator>
 
     ~BasicTopology()
     {
+        std::lock_guard<std::mutex> lk(fMtx);
         fDDSSession.UnsubscribeFromCommands();
         try {
             fChangeStateOp.Cancel(fState);