Merge bitcoin/bitcoin#24099: Replace RecursiveMutex cs_mapLocalHost with Mutex, and rename it

5e7e4c9 refactor: replace RecursiveMutex g_maplocalhost_mutex with Mutex (w0xlt)
a7da140 scripted-diff: rename cs_mapLocalHost -> g_maplocalhost_mutex (w0xlt)

Pull request description:

  This PR is related to #19303 and gets rid of the `RecursiveMutex cs_mapLocalHost`.

ACKs for top commit:
  shaavan:
    ACK 5e7e4c9
  theStack:
    ACK 5e7e4c9
  hebasto:
    ACK 5e7e4c9, I have reviewed the code and it looks OK, I agree it can be merged.

Tree-SHA512: 961171e346fe385e16db9830115a8096f4ca2499bbea11a08c02ca808638dfb63c434ab9d66392c71e85be6352c8a2b6a0054b5a61aaabd28d71581fed5beae7

Author: MarcoFalke

src/net.cpp

@@ -112,9 +112,9 @@ static const uint64_t RANDOMIZER_ID_ADDRCACHE = 0x1cf2e4ddd306dda9ULL; // SHA256
 //
 bool fDiscover = true;
 bool fListen = true;
-RecursiveMutex cs_mapLocalHost;
-std::map<CNetAddr, LocalServiceInfo> mapLocalHost GUARDED_BY(cs_mapLocalHost);
-static bool vfLimited[NET_MAX] GUARDED_BY(cs_mapLocalHost) = {};
+Mutex g_maplocalhost_mutex;
+std::map<CNetAddr, LocalServiceInfo> mapLocalHost GUARDED_BY(g_maplocalhost_mutex);
+static bool vfLimited[NET_MAX] GUARDED_BY(g_maplocalhost_mutex) = {};
 std::string strSubVersion;
 
 void CConnman::AddAddrFetch(const std::string& strDest)
@@ -137,7 +137,7 @@ bool GetLocal(CService& addr, const CNetAddr *paddrPeer)
     int nBestScore = -1;
     int nBestReachability = -1;
     {
-        LOCK(cs_mapLocalHost);
+        LOCK(g_maplocalhost_mutex);
         for (const auto& entry : mapLocalHost)
         {
             int nScore = entry.second.nScore;
@@ -193,7 +193,7 @@ CAddress GetLocalAddress(const CNetAddr *paddrPeer, ServiceFlags nLocalServices)
 
 static int GetnScore(const CService& addr)
 {
-    LOCK(cs_mapLocalHost);
+    LOCK(g_maplocalhost_mutex);
     const auto it = mapLocalHost.find(addr);
     return (it != mapLocalHost.end()) ? it->second.nScore : 0;
 }
@@ -264,7 +264,7 @@ bool AddLocal(const CService& addr_, int nScore)
     LogPrintf("AddLocal(%s,%i)\n", addr.ToString(), nScore);
 
     {
-        LOCK(cs_mapLocalHost);
+        LOCK(g_maplocalhost_mutex);
         const auto [it, is_newly_added] = mapLocalHost.emplace(addr, LocalServiceInfo());
         LocalServiceInfo &info = it->second;
         if (is_newly_added || nScore >= info.nScore) {
@@ -283,7 +283,7 @@ bool AddLocal(const CNetAddr &addr, int nScore)
 
 void RemoveLocal(const CService& addr)
 {
-    LOCK(cs_mapLocalHost);
+    LOCK(g_maplocalhost_mutex);
     LogPrintf("RemoveLocal(%s)\n", addr.ToString());
     mapLocalHost.erase(addr);
 }
@@ -292,13 +292,13 @@ void SetReachable(enum Network net, bool reachable)
 {
     if (net == NET_UNROUTABLE || net == NET_INTERNAL)
         return;
-    LOCK(cs_mapLocalHost);
+    LOCK(g_maplocalhost_mutex);
     vfLimited[net] = !reachable;
 }
 
 bool IsReachable(enum Network net)
 {
-    LOCK(cs_mapLocalHost);
+    LOCK(g_maplocalhost_mutex);
     return !vfLimited[net];
 }
 
@@ -310,7 +310,7 @@ bool IsReachable(const CNetAddr &addr)
 /** vote for a local address */
 bool SeenLocal(const CService& addr)
 {
-    LOCK(cs_mapLocalHost);
+    LOCK(g_maplocalhost_mutex);
     const auto it = mapLocalHost.find(addr);
     if (it == mapLocalHost.end()) return false;
     ++it->second.nScore;
@@ -321,7 +321,7 @@ bool SeenLocal(const CService& addr)
 /** check whether a given address is potentially local */
 bool IsLocal(const CService& addr)
 {
-    LOCK(cs_mapLocalHost);
+    LOCK(g_maplocalhost_mutex);
     return mapLocalHost.count(addr) > 0;
 }
 

src/net.h

@@ -230,8 +230,8 @@ struct LocalServiceInfo {
     uint16_t nPort;
 };
 
-extern RecursiveMutex cs_mapLocalHost;
-extern std::map<CNetAddr, LocalServiceInfo> mapLocalHost GUARDED_BY(cs_mapLocalHost);
+extern Mutex g_maplocalhost_mutex;
+extern std::map<CNetAddr, LocalServiceInfo> mapLocalHost GUARDED_BY(g_maplocalhost_mutex);
 
 extern const std::string NET_MESSAGE_COMMAND_OTHER;
 typedef std::map<std::string, uint64_t> mapMsgCmdSize; //command, total bytes

src/rpc/net.cpp

@@ -648,7 +648,7 @@ static RPCHelpMan getnetworkinfo()
     obj.pushKV("incrementalfee", ValueFromAmount(::incrementalRelayFee.GetFeePerK()));
     UniValue localAddresses(UniValue::VARR);
     {
-        LOCK(cs_mapLocalHost);
+        LOCK(g_maplocalhost_mutex);
         for (const std::pair<const CNetAddr, LocalServiceInfo> &item : mapLocalHost)
         {
             UniValue rec(UniValue::VOBJ);

src/test/net_tests.cpp

@@ -593,7 +593,7 @@ BOOST_AUTO_TEST_CASE(ipv4_peer_with_ipv6_addrMe_test)
     // that a normal IPv4 address is among the entries, but if this address is
     // !IsRoutable the undefined behavior is easier to trigger deterministically
     {
-        LOCK(cs_mapLocalHost);
+        LOCK(g_maplocalhost_mutex);
         in_addr ipv4AddrLocal;
         ipv4AddrLocal.s_addr = 0x0100007f;
         CNetAddr addr = CNetAddr(ipv4AddrLocal);