Add locking annotation for vNodes. vNodes is guarded by cs_vNodes.

Author: practicalswift

src/net.h

@@ -177,7 +177,18 @@ class CConnman
     CConnman(uint64_t seed0, uint64_t seed1);
     ~CConnman();
     bool Start(CScheduler& scheduler, const Options& options);
-    void Stop();
+
+    // TODO: Remove NO_THREAD_SAFETY_ANALYSIS. Lock cs_vNodes before reading the variable vNodes.
+    //
+    // When removing NO_THREAD_SAFETY_ANALYSIS be aware of the following lock order requirements:
+    // * CheckForStaleTipAndEvictPeers locks cs_main before indirectly calling GetExtraOutboundCount
+    //   which locks cs_vNodes.
+    // * ProcessMessage locks cs_main and g_cs_orphans before indirectly calling ForEachNode which
+    //   locks cs_vNodes.
+    //
+    // Thus the implicit locking order requirement is: (1) cs_main, (2) g_cs_orphans, (3) cs_vNodes.
+    void Stop() NO_THREAD_SAFETY_ANALYSIS;
+
     void Interrupt();
     bool GetNetworkActive() const { return fNetworkActive; };
     bool GetUseAddrmanOutgoing() const { return m_use_addrman_outgoing; };
@@ -418,7 +429,7 @@ class CConnman
     CCriticalSection cs_vOneShots;
     std::vector<std::string> vAddedNodes GUARDED_BY(cs_vAddedNodes);
     CCriticalSection cs_vAddedNodes;
-    std::vector<CNode*> vNodes;
+    std::vector<CNode*> vNodes GUARDED_BY(cs_vNodes);
     std::list<CNode*> vNodesDisconnected;
     mutable CCriticalSection cs_vNodes;
     std::atomic<NodeId> nLastNodeId{0};