net: Add Clang thread safety annotations for guarded variables in the networking code

src/net.cpp

@@ -82,8 +82,8 @@ bool fDiscover = true;
 bool fListen = true;
 bool fRelayTxes = true;
 CCriticalSection cs_mapLocalHost;
-std::map<CNetAddr, LocalServiceInfo> mapLocalHost;
-static bool vfLimited[NET_MAX] = {};
+std::map<CNetAddr, LocalServiceInfo> mapLocalHost GUARDED_BY(cs_mapLocalHost);
+static bool vfLimited[NET_MAX] GUARDED_BY(cs_mapLocalHost) = {};
 std::string strSubVersion;
 
 limitedmap<uint256, int64_t> mapAlreadyAskedFor(MAX_INV_SZ);
@@ -715,7 +715,10 @@ void CNode::copyStats(CNodeStats &stats)
         X(nRecvBytes);
     }
     X(fWhitelisted);
-    X(minFeeFilter);
+    {
+        LOCK(cs_feeFilter);
+        X(minFeeFilter);
+    }
 
     // It is common for nodes with good ping times to suddenly become lagged,
     // due to a new block arriving or other large transfer.
@@ -874,16 +877,7 @@ const uint256& CNetMessage::GetMessageHash() const
     return data_hash;
 }
 
-
-
-
-
-
-
-
-
-// requires LOCK(cs_vSend)
-size_t CConnman::SocketSendData(CNode *pnode) const
+size_t CConnman::SocketSendData(CNode *pnode) const EXCLUSIVE_LOCKS_REQUIRED(pnode->cs_vSend)
 {
     auto it = pnode->vSendMsg.begin();
     size_t nSentSize = 0;

src/net.h

@@ -400,12 +400,12 @@ class CConnman
 
     std::vector<ListenSocket> vhListenSocket;
     std::atomic<bool> fNetworkActive;
-    banmap_t setBanned;
+    banmap_t setBanned GUARDED_BY(cs_setBanned);
     CCriticalSection cs_setBanned;
-    bool setBannedIsDirty;
+    bool setBannedIsDirty GUARDED_BY(cs_setBanned);
     bool fAddressesInitialized;
     CAddrMan addrman;
-    std::deque<std::string> vOneShots;
+    std::deque<std::string> vOneShots GUARDED_BY(cs_vOneShots);
     CCriticalSection cs_vOneShots;
     std::vector<std::string> vAddedNodes GUARDED_BY(cs_vAddedNodes);
     CCriticalSection cs_vAddedNodes;
@@ -540,7 +540,7 @@ struct LocalServiceInfo {
 };
 
 extern CCriticalSection cs_mapLocalHost;
-extern std::map<CNetAddr, LocalServiceInfo> mapLocalHost;
+extern std::map<CNetAddr, LocalServiceInfo> mapLocalHost GUARDED_BY(cs_mapLocalHost);
 typedef std::map<std::string, uint64_t> mapMsgCmdSize; //command, total bytes
 
 class CNodeStats
@@ -630,23 +630,23 @@ class CNode
 public:
     // socket
     std::atomic<ServiceFlags> nServices;
-    SOCKET hSocket;
+    SOCKET hSocket GUARDED_BY(cs_hSocket);
     size_t nSendSize; // total size of all vSendMsg entries
     size_t nSendOffset; // offset inside the first vSendMsg already sent
-    uint64_t nSendBytes;
-    std::deque<std::vector<unsigned char>> vSendMsg;
+    uint64_t nSendBytes GUARDED_BY(cs_vSend);
+    std::deque<std::vector<unsigned char>> vSendMsg GUARDED_BY(cs_vSend);
     CCriticalSection cs_vSend;
     CCriticalSection cs_hSocket;
     CCriticalSection cs_vRecv;
 
     CCriticalSection cs_vProcessMsg;
-    std::list<CNetMessage> vProcessMsg;
+    std::list<CNetMessage> vProcessMsg GUARDED_BY(cs_vProcessMsg);
     size_t nProcessQueueSize;
 
     CCriticalSection cs_sendProcessing;
 
     std::deque<CInv> vRecvGetData;
-    uint64_t nRecvBytes;
+    uint64_t nRecvBytes GUARDED_BY(cs_vRecv);
     std::atomic<int> nRecvVersion;
 
     std::atomic<int64_t> nLastSend;
@@ -662,7 +662,7 @@ class CNode
     // to be printed out, displayed to humans in various forms and so on. So we sanitize it and
     // store the sanitized version in cleanSubVer. The original should be used when dealing with
     // the network or wire types and the cleaned string used when displayed or logged.
-    std::string strSubVer, cleanSubVer;
+    std::string strSubVer GUARDED_BY(cs_SubVer), cleanSubVer GUARDED_BY(cs_SubVer);
     CCriticalSection cs_SubVer; // used for both cleanSubVer and strSubVer
     bool fWhitelisted; // This peer can bypass DoS banning.
     bool fFeeler; // If true this node is being used as a short lived feeler.
@@ -681,7 +681,7 @@ class CNode
     bool fSentAddr;
     CSemaphoreGrant grantOutbound;
     mutable CCriticalSection cs_filter;
-    std::unique_ptr<CBloomFilter> pfilter;
+    std::unique_ptr<CBloomFilter> pfilter PT_GUARDED_BY(cs_filter);
     std::atomic<int> nRefCount;
 
     const uint64_t nKeyedNetGroup;
@@ -690,7 +690,7 @@ class CNode
 protected:
 
     mapMsgCmdSize mapSendBytesPerMsgCmd;
-    mapMsgCmdSize mapRecvBytesPerMsgCmd;
+    mapMsgCmdSize mapRecvBytesPerMsgCmd GUARDED_BY(cs_vRecv);
 
 public:
     uint256 hashContinue;
@@ -701,18 +701,18 @@ class CNode
     CRollingBloomFilter addrKnown;
     bool fGetAddr;
     std::set<uint256> setKnown;
-    int64_t nNextAddrSend;
-    int64_t nNextLocalAddrSend;
+    int64_t nNextAddrSend GUARDED_BY(cs_sendProcessing);
+    int64_t nNextLocalAddrSend GUARDED_BY(cs_sendProcessing);
 
     // inventory based relay
-    CRollingBloomFilter filterInventoryKnown;
+    CRollingBloomFilter filterInventoryKnown GUARDED_BY(cs_inventory);
     // Set of transaction ids we still have to announce.
     // They are sorted by the mempool before relay, so the order is not important.
     std::set<uint256> setInventoryTxToSend;
     // List of block ids we still have announce.
     // There is no final sorting before sending, as they are always sent immediately
     // and in the order requested.
-    std::vector<uint256> vInventoryBlockToSend;
+    std::vector<uint256> vInventoryBlockToSend GUARDED_BY(cs_inventory);
     CCriticalSection cs_inventory;
     std::set<uint256> setAskFor;
     std::multimap<int64_t, CInv> mapAskFor;
@@ -741,7 +741,7 @@ class CNode
     // Whether a ping is requested.
     std::atomic<bool> fPingQueued;
     // Minimum fee rate with which to filter inv's to this node
-    CAmount minFeeFilter;
+    CAmount minFeeFilter GUARDED_BY(cs_feeFilter);
     CCriticalSection cs_feeFilter;
     CAmount lastSentFeeFilter;
     int64_t nextSendTimeFeeFilter;
@@ -761,10 +761,10 @@ class CNode
     std::list<CNetMessage> vRecvMsg;  // Used only by SocketHandler thread
 
     mutable CCriticalSection cs_addrName;
-    std::string addrName;
+    std::string addrName GUARDED_BY(cs_addrName);
 
     // Our address, as reported by the peer
-    CService addrLocal;
+    CService addrLocal GUARDED_BY(cs_addrLocal);
     mutable CCriticalSection cs_addrLocal;
 public:
 

src/netbase.cpp

@@ -26,9 +26,9 @@
 #endif
 
 // Settings
-static proxyType proxyInfo[NET_MAX];
-static proxyType nameProxy;
 static CCriticalSection cs_proxyInfos;
+static proxyType proxyInfo[NET_MAX] GUARDED_BY(cs_proxyInfos);
+static proxyType nameProxy GUARDED_BY(cs_proxyInfos);
 int nConnectTimeout = DEFAULT_CONNECT_TIMEOUT;
 bool fNameLookup = DEFAULT_NAME_LOOKUP;