Merge #17891: scripted-diff: Replace CCriticalSection with RecursiveMutex

e09c701e0110350f78366fb837308c086b6503c0 scripted-diff: Bump copyright of files changed in 2020 (MarcoFalke)
6cbe6209646db8914b87bf6edbc18c6031a16f1e scripted-diff: Replace CCriticalSection with RecursiveMutex (MarcoFalke)

Pull request description:

  `RecursiveMutex` better clarifies that the mutex is recursive, see also the standard library naming: https://en.cppreference.com/w/cpp/thread/recursive_mutex

  For that reason, and to avoid different people asking me the same question repeatedly (e.g. https://github.com/bitcoin/bitcoin/pull/15932#pullrequestreview-339175124 ), remove the outdated alias `CCriticalSection` with a scripted-diff

ACKs for top commit:
  Empact:
    ACK https://github.com/bitcoin/bitcoin/pull/17891/commits/e09c701e0110350f78366fb837308c086b6503c0 diff and scripts look correct
  promag:
    ACK e09c701e0110350f78366fb837308c086b6503c0
  practicalswift:
    ACK e09c701e0110350f78366fb837308c086b6503c0 -- scripted diff looks correct

Tree-SHA512: 4bd7b5de1befdcf91dc8f43c127a1fee49679e06895a43216f160344a395c8e426dc68d529fbd2d5e1c215625a5a392dc415b1bce4127316aae7ecf98030c855

79 files changed, 127 insertions, 128 deletions

diff --git a/ci/test/04_install.sh b/ci/test/04_install.sh
index 56f4ece1ad..6d0f5258b6 100755
--- a/ci/test/04_install.sh
+++ b/ci/test/04_install.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# Copyright (c) 2018-2019 The Bitcoin Core developers
+# Copyright (c) 2018-2020 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/contrib/devtools/security-check.py b/contrib/devtools/security-check.py
index 9941c57479..21d64e893d 100755
--- a/contrib/devtools/security-check.py
+++ b/contrib/devtools/security-check.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-# Copyright (c) 2015-2018 The Bitcoin Core developers
+# Copyright (c) 2015-2020 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 '''
diff --git a/contrib/macdeploy/extract-osx-sdk.sh b/contrib/macdeploy/extract-osx-sdk.sh
index 3fa05cafac..21243ada04 100755
--- a/contrib/macdeploy/extract-osx-sdk.sh
+++ b/contrib/macdeploy/extract-osx-sdk.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# Copyright (c) 2016-2018 The Bitcoin Core developers
+# Copyright (c) 2016-2019 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/contrib/verify-commits/pre-push-hook.sh b/contrib/verify-commits/pre-push-hook.sh
index 2e15a6326d..a26791f0d1 100755
--- a/contrib/verify-commits/pre-push-hook.sh
+++ b/contrib/verify-commits/pre-push-hook.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# Copyright (c) 2014-2018 The Bitcoin Core developers
+# Copyright (c) 2014-2019 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/addrman.h b/src/addrman.h
index c001d59da5..8685ea5049 100644
--- a/src/addrman.h
+++ b/src/addrman.h
@@ -1,5 +1,5 @@
 // Copyright (c) 2012 Pieter Wuille
-// Copyright (c) 2012-2019 The Bitcoin Core developers
+// Copyright (c) 2012-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -172,7 +172,7 @@ class CAddrMan
 {
 protected:
     //! critical section to protect the inner data structures
-    mutable CCriticalSection cs;
+    mutable RecursiveMutex cs;
 
 private:
     //! last used nId
diff --git a/src/banman.h b/src/banman.h
index 3997ca8096..8984874914 100644
--- a/src/banman.h
+++ b/src/banman.h
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 #ifndef BITCOIN_BANMAN_H
@@ -59,7 +59,7 @@ private:
     //!clean unused entries (if bantime has expired)
     void SweepBanned();
 
-    CCriticalSection m_cs_banned;
+    RecursiveMutex m_cs_banned;
     banmap_t m_banned GUARDED_BY(m_cs_banned);
     bool m_is_dirty GUARDED_BY(m_cs_banned);
     CClientUIInterface* m_client_interface = nullptr;
diff --git a/src/bench/bench.h b/src/bench/bench.h
index e2af2a8856..6b7a0f76d1 100644
--- a/src/bench/bench.h
+++ b/src/bench/bench.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2015-2019 The Bitcoin Core developers
+// Copyright (c) 2015-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/dummywallet.cpp b/src/dummywallet.cpp
index 1bc4e7ef72..a5582e3b2c 100644
--- a/src/dummywallet.cpp
+++ b/src/dummywallet.cpp
@@ -1,4 +1,4 @@
-// Copyright (c) 2018-2019 The Bitcoin Core developers
+// Copyright (c) 2018-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/init.cpp b/src/init.cpp
index dc0f2ce05c..92481c4a7e 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -172,7 +172,7 @@ void Interrupt(NodeContext& node)
 void Shutdown(NodeContext& node)
 {
     LogPrintf("%s: In progress...\n", __func__);
-    static CCriticalSection cs_Shutdown;
+    static RecursiveMutex cs_Shutdown;
     TRY_LOCK(cs_Shutdown, lockShutdown);
     if (!lockShutdown)
         return;
diff --git a/src/interfaces/chain.cpp b/src/interfaces/chain.cpp
index ed35e19525..643bb58d56 100644
--- a/src/interfaces/chain.cpp
+++ b/src/interfaces/chain.cpp
@@ -1,4 +1,4 @@
-// Copyright (c) 2018-2019 The Bitcoin Core developers
+// Copyright (c) 2018-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -38,7 +38,7 @@
 namespace interfaces {
 namespace {
 
-class LockImpl : public Chain::Lock, public UniqueLock<CCriticalSection>
+class LockImpl : public Chain::Lock, public UniqueLock<RecursiveMutex>
 {
     Optional<int> getHeight() override
     {
diff --git a/src/interfaces/chain.h b/src/interfaces/chain.h
index c42f1a1fa3..7304f82749 100644
--- a/src/interfaces/chain.h
+++ b/src/interfaces/chain.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2018-2019 The Bitcoin Core developers
+// Copyright (c) 2018-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/interfaces/handler.cpp b/src/interfaces/handler.cpp
index 4e235688fe..95035c1b54 100644
--- a/src/interfaces/handler.cpp
+++ b/src/interfaces/handler.cpp
@@ -1,4 +1,4 @@
-// Copyright (c) 2018 The Bitcoin Core developers
+// Copyright (c) 2018-2019 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/interfaces/handler.h b/src/interfaces/handler.h
index 46918bc22e..fbac3c6b71 100644
--- a/src/interfaces/handler.h
+++ b/src/interfaces/handler.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2018 The Bitcoin Core developers
+// Copyright (c) 2018-2019 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/interfaces/node.cpp b/src/interfaces/node.cpp
index 7e022dce7a..8a64a9d26a 100644
--- a/src/interfaces/node.cpp
+++ b/src/interfaces/node.cpp
@@ -1,4 +1,4 @@
-// Copyright (c) 2018-2019 The Bitcoin Core developers
+// Copyright (c) 2018-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/logging.cpp b/src/logging.cpp
index 9376c51ded..6fd916b603 100644
--- a/src/logging.cpp
+++ b/src/logging.cpp
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/logging.h b/src/logging.h
index b8766e49cc..b2fde1b9ea 100644
--- a/src/logging.h
+++ b/src/logging.h
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/net.cpp b/src/net.cpp
index 99dae88bab..75b230d0be 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -85,7 +85,7 @@ static const uint64_t RANDOMIZER_ID_LOCALHOSTNONCE = 0xd93e69e2bbfa5735ULL; // S
 bool fDiscover = true;
 bool fListen = true;
 bool g_relay_txes = !DEFAULT_BLOCKSONLY;
-CCriticalSection cs_mapLocalHost;
+RecursiveMutex cs_mapLocalHost;
 std::map<CNetAddr, LocalServiceInfo> mapLocalHost GUARDED_BY(cs_mapLocalHost);
 static bool vfLimited[NET_MAX] GUARDED_BY(cs_mapLocalHost) = {};
 std::string strSubVersion;
diff --git a/src/net.h b/src/net.h
index a69c68e43a..2e7f29a8d7 100644
--- a/src/net.h
+++ b/src/net.h
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -384,8 +384,8 @@ private:
     static bool NodeFullyConnected(const CNode* pnode);
 
     // Network usage totals
-    CCriticalSection cs_totalBytesRecv;
-    CCriticalSection cs_totalBytesSent;
+    RecursiveMutex cs_totalBytesRecv;
+    RecursiveMutex cs_totalBytesSent;
     uint64_t nTotalBytesRecv GUARDED_BY(cs_totalBytesRecv) {0};
     uint64_t nTotalBytesSent GUARDED_BY(cs_totalBytesSent) {0};
 
@@ -410,12 +410,12 @@ private:
     bool fAddressesInitialized{false};
     CAddrMan addrman;
     std::deque<std::string> vOneShots GUARDED_BY(cs_vOneShots);
-    CCriticalSection cs_vOneShots;
+    RecursiveMutex cs_vOneShots;
     std::vector<std::string> vAddedNodes GUARDED_BY(cs_vAddedNodes);
-    CCriticalSection cs_vAddedNodes;
+    RecursiveMutex cs_vAddedNodes;
     std::vector<CNode*> vNodes GUARDED_BY(cs_vNodes);
     std::list<CNode*> vNodesDisconnected;
-    mutable CCriticalSection cs_vNodes;
+    mutable RecursiveMutex cs_vNodes;
     std::atomic<NodeId> nLastNodeId{0};
     unsigned int nPrevNodeCount{0};
 
@@ -565,7 +565,7 @@ struct LocalServiceInfo {
     int nPort;
 };
 
-extern CCriticalSection cs_mapLocalHost;
+extern RecursiveMutex cs_mapLocalHost;
 extern std::map<CNetAddr, LocalServiceInfo> mapLocalHost GUARDED_BY(cs_mapLocalHost);
 
 extern const std::string NET_MESSAGE_COMMAND_OTHER;
@@ -713,15 +713,15 @@ public:
     size_t nSendOffset{0}; // offset inside the first vSendMsg already sent
     uint64_t nSendBytes GUARDED_BY(cs_vSend){0};
     std::deque<std::vector<unsigned char>> vSendMsg GUARDED_BY(cs_vSend);
-    CCriticalSection cs_vSend;
-    CCriticalSection cs_hSocket;
-    CCriticalSection cs_vRecv;
+    RecursiveMutex cs_vSend;
+    RecursiveMutex cs_hSocket;
+    RecursiveMutex cs_vRecv;
 
-    CCriticalSection cs_vProcessMsg;
+    RecursiveMutex cs_vProcessMsg;
     std::list<CNetMessage> vProcessMsg GUARDED_BY(cs_vProcessMsg);
     size_t nProcessQueueSize{0};
 
-    CCriticalSection cs_sendProcessing;
+    RecursiveMutex cs_sendProcessing;
 
     std::deque<CInv> vRecvGetData;
     uint64_t nRecvBytes GUARDED_BY(cs_vRecv){0};
@@ -787,11 +787,11 @@ public:
     // There is no final sorting before sending, as they are always sent immediately
     // and in the order requested.
     std::vector<uint256> vInventoryBlockToSend GUARDED_BY(cs_inventory);
-    CCriticalSection cs_inventory;
+    RecursiveMutex cs_inventory;
 
     struct TxRelay {
         TxRelay() { pfilter = MakeUnique<CBloomFilter>(); }
-        mutable CCriticalSection cs_filter;
+        mutable RecursiveMutex cs_filter;
         // We use fRelayTxes for two purposes -
         // a) it allows us to not relay tx invs before receiving the peer's version message
         // b) the peer may tell us in its version message that we should not relay tx invs
@@ -799,7 +799,7 @@ public:
         bool fRelayTxes GUARDED_BY(cs_filter){false};
         std::unique_ptr<CBloomFilter> pfilter PT_GUARDED_BY(cs_filter) GUARDED_BY(cs_filter);
 
-        mutable CCriticalSection cs_tx_inventory;
+        mutable RecursiveMutex cs_tx_inventory;
         CRollingBloomFilter filterInventoryKnown GUARDED_BY(cs_tx_inventory){50000, 0.000001};
         // Set of transaction ids we still have to announce.
         // They are sorted by the mempool before relay, so the order is not important.
@@ -810,7 +810,7 @@ public:
         std::atomic<std::chrono::seconds> m_last_mempool_req{std::chrono::seconds{0}};
         std::chrono::microseconds nNextInvSend{0};
 
-        CCriticalSection cs_feeFilter;
+        RecursiveMutex cs_feeFilter;
         // Minimum fee rate with which to filter inv's to this node
         CAmount minFeeFilter GUARDED_BY(cs_feeFilter){0};
         CAmount lastSentFeeFilter{0};
@@ -872,12 +872,12 @@ private:
     NetPermissionFlags m_permissionFlags{ PF_NONE };
     std::list<CNetMessage> vRecvMsg;  // Used only by SocketHandler thread
 
-    mutable CCriticalSection cs_addrName;
+    mutable RecursiveMutex cs_addrName;
     std::string addrName GUARDED_BY(cs_addrName);
 
     // Our address, as reported by the peer
     CService addrLocal GUARDED_BY(cs_addrLocal);
-    mutable CCriticalSection cs_addrLocal;
+    mutable RecursiveMutex cs_addrLocal;
 public:
 
     NodeId GetId() const {
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index 783404bcec..230d696de6 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -90,7 +90,7 @@ struct COrphanTx {
     int64_t nTimeExpire;
     size_t list_pos;
 };
-CCriticalSection g_cs_orphans;
+RecursiveMutex g_cs_orphans;
 std::map<uint256, COrphanTx> mapOrphanTransactions GUARDED_BY(g_cs_orphans);
 
 void EraseOrphansFor(NodeId peer);
@@ -1162,7 +1162,7 @@ void PeerLogicValidation::BlockConnected(const std::shared_ptr<const CBlock>& pb
 }
 
 // All of the following cache a recent block, and are protected by cs_most_recent_block
-static CCriticalSection cs_most_recent_block;
+static RecursiveMutex cs_most_recent_block;
 static std::shared_ptr<const CBlock> most_recent_block GUARDED_BY(cs_most_recent_block);
 static std::shared_ptr<const CBlockHeaderAndShortTxIDs> most_recent_compact_block GUARDED_BY(cs_most_recent_block);
 static uint256 most_recent_block_hash GUARDED_BY(cs_most_recent_block);
diff --git a/src/net_processing.h b/src/net_processing.h
index a034e3b32f..2ceadedd99 100644
--- a/src/net_processing.h
+++ b/src/net_processing.h
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -11,7 +11,7 @@
 #include <consensus/params.h>
 #include <sync.h>
 
-extern CCriticalSection cs_main;
+extern RecursiveMutex cs_main;
 
 /** Default for -maxorphantx, maximum number of orphan transactions kept in memory */
 static const unsigned int DEFAULT_MAX_ORPHAN_TRANSACTIONS = 100;
diff --git a/src/netbase.cpp b/src/netbase.cpp
index 735003cb06..1aefecb5ba 100644
--- a/src/netbase.cpp
+++ b/src/netbase.cpp
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -27,7 +27,7 @@
 #endif
 
 // Settings
-static CCriticalSection cs_proxyInfos;
+static RecursiveMutex cs_proxyInfos;
 static proxyType proxyInfo[NET_MAX] GUARDED_BY(cs_proxyInfos);
 static proxyType nameProxy GUARDED_BY(cs_proxyInfos);
 int nConnectTimeout = DEFAULT_CONNECT_TIMEOUT;
diff --git a/src/policy/fees.h b/src/policy/fees.h
index 5d86417524..6ee6e0d547 100644
--- a/src/policy/fees.h
+++ b/src/policy/fees.h
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 #ifndef BITCOIN_POLICY_FEES_H
@@ -223,7 +223,7 @@ public:
     unsigned int HighestTargetTracked(FeeEstimateHorizon horizon) const;
 
 private:
-    mutable CCriticalSection m_cs_fee_estimator;
+    mutable RecursiveMutex m_cs_fee_estimator;
 
     unsigned int nBestSeenHeight GUARDED_BY(m_cs_fee_estimator);
     unsigned int firstRecordedHeight GUARDED_BY(m_cs_fee_estimator);
diff --git a/src/qt/bitcoin.cpp b/src/qt/bitcoin.cpp
index 22a1dacab0..4313d6ee7f 100644
--- a/src/qt/bitcoin.cpp
+++ b/src/qt/bitcoin.cpp
@@ -1,4 +1,4 @@
-// Copyright (c) 2011-2019 The Bitcoin Core developers
+// Copyright (c) 2011-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/qt/bitcoin.h b/src/qt/bitcoin.h
index f41cf9a8ec..077a37fde5 100644
--- a/src/qt/bitcoin.h
+++ b/src/qt/bitcoin.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011-2019 The Bitcoin Core developers
+// Copyright (c) 2011-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/qt/bitcoingui.cpp b/src/qt/bitcoingui.cpp
index 7911784577..ef08439659 100644
--- a/src/qt/bitcoingui.cpp
+++ b/src/qt/bitcoingui.cpp
@@ -1,4 +1,4 @@
-// Copyright (c) 2011-2019 The Bitcoin Core developers
+// Copyright (c) 2011-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/qt/bitcoinunits.h b/src/qt/bitcoinunits.h
index 7c82febf65..4c8a889965 100644
--- a/src/qt/bitcoinunits.h
+++ b/src/qt/bitcoinunits.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011-2018 The Bitcoin Core developers
+// Copyright (c) 2011-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/qt/coincontroltreewidget.h b/src/qt/coincontroltreewidget.h
index 65f94644e8..39dc9a5e9e 100644
--- a/src/qt/coincontroltreewidget.h
+++ b/src/qt/coincontroltreewidget.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011-2018 The Bitcoin Core developers
+// Copyright (c) 2011-2019 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/qt/csvmodelwriter.h b/src/qt/csvmodelwriter.h
index ab27fef99e..e443529335 100644
--- a/src/qt/csvmodelwriter.h
+++ b/src/qt/csvmodelwriter.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011-2018 The Bitcoin Core developers
+// Copyright (c) 2011-2019 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/qt/guiconstants.h b/src/qt/guiconstants.h
index 5231dfb7e7..9457ea37d6 100644
--- a/src/qt/guiconstants.h
+++ b/src/qt/guiconstants.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011-2019 The Bitcoin Core developers
+// Copyright (c) 2011-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/qt/guiutil.h b/src/qt/guiutil.h
index 9722444058..05e73cc5f0 100644
--- a/src/qt/guiutil.h
+++ b/src/qt/guiutil.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011-2019 The Bitcoin Core developers
+// Copyright (c) 2011-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/qt/intro.cpp b/src/qt/intro.cpp
index f064556ae5..53f0c3a108 100644
--- a/src/qt/intro.cpp
+++ b/src/qt/intro.cpp
@@ -1,4 +1,4 @@
-// Copyright (c) 2011-2019 The Bitcoin Core developers
+// Copyright (c) 2011-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/qt/macnotificationhandler.mm b/src/qt/macnotificationhandler.mm
index 7c094134cd..b16042e946 100644
--- a/src/qt/macnotificationhandler.mm
+++ b/src/qt/macnotificationhandler.mm
@@ -1,4 +1,4 @@
-// Copyright (c) 2011-2018 The Bitcoin Core developers
+// Copyright (c) 2011-2019 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/qt/optionsmodel.cpp b/src/qt/optionsmodel.cpp
index df5248f55e..b4b5b32311 100644
--- a/src/qt/optionsmodel.cpp
+++ b/src/qt/optionsmodel.cpp
@@ -1,4 +1,4 @@
-// Copyright (c) 2011-2019 The Bitcoin Core developers
+// Copyright (c) 2011-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/qt/optionsmodel.h b/src/qt/optionsmodel.h
index 6f5c8b8c5c..524fe268b9 100644
--- a/src/qt/optionsmodel.h
+++ b/src/qt/optionsmodel.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011-2019 The Bitcoin Core developers
+// Copyright (c) 2011-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/qt/qvaluecombobox.h b/src/qt/qvaluecombobox.h
index d873322405..5cca515079 100644
--- a/src/qt/qvaluecombobox.h
+++ b/src/qt/qvaluecombobox.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011-2018 The Bitcoin Core developers
+// Copyright (c) 2011-2019 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/qt/test/apptests.h b/src/qt/test/apptests.h
index a428728db8..d16c9fe487 100644
--- a/src/qt/test/apptests.h
+++ b/src/qt/test/apptests.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2018-2017 The Bitcoin Core developers
+// Copyright (c) 2018-2019 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/qt/trafficgraphwidget.h b/src/qt/trafficgraphwidget.h
index a0b83e27fe..af5890ba24 100644
--- a/src/qt/trafficgraphwidget.h
+++ b/src/qt/trafficgraphwidget.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011-2018 The Bitcoin Core developers
+// Copyright (c) 2011-2019 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/qt/transactiondescdialog.h b/src/qt/transactiondescdialog.h
index 20b2092ed7..74e34cde87 100644
--- a/src/qt/transactiondescdialog.h
+++ b/src/qt/transactiondescdialog.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011-2018 The Bitcoin Core developers
+// Copyright (c) 2011-2019 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/qt/walletframe.cpp b/src/qt/walletframe.cpp
index f363d5ddc5..27a5a5ac64 100644
--- a/src/qt/walletframe.cpp
+++ b/src/qt/walletframe.cpp
@@ -1,4 +1,4 @@
-// Copyright (c) 2011-2019 The Bitcoin Core developers
+// Copyright (c) 2011-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/rpc/mining.cpp b/src/rpc/mining.cpp
index 81da053b4e..e5994b172b 100644
--- a/src/rpc/mining.cpp
+++ b/src/rpc/mining.cpp
@@ -1,5 +1,5 @@
 // Copyright (c) 2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/rpc/server.cpp b/src/rpc/server.cpp
index 91d3e1fca4..df8e687d82 100644
--- a/src/rpc/server.cpp
+++ b/src/rpc/server.cpp
@@ -1,5 +1,5 @@
 // Copyright (c) 2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -18,7 +18,7 @@
 #include <memory> // for unique_ptr
 #include <unordered_map>
 
-static CCriticalSection cs_rpcWarmup;
+static RecursiveMutex cs_rpcWarmup;
 static std::atomic<bool> g_rpc_running{false};
 static bool fRPCInWarmup GUARDED_BY(cs_rpcWarmup) = true;
 static std::string rpcWarmupStatus GUARDED_BY(cs_rpcWarmup) = "RPC server started";
diff --git a/src/scheduler.h b/src/scheduler.h
index b8597b6f5b..7080adf34c 100644
--- a/src/scheduler.h
+++ b/src/scheduler.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2015-2019 The Bitcoin Core developers
+// Copyright (c) 2015-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -98,7 +98,7 @@ class SingleThreadedSchedulerClient {
 private:
     CScheduler *m_pscheduler;
 
-    CCriticalSection m_cs_callbacks_pending;
+    RecursiveMutex m_cs_callbacks_pending;
     std::list<std::function<void ()>> m_callbacks_pending GUARDED_BY(m_cs_callbacks_pending);
     bool m_are_callbacks_running GUARDED_BY(m_cs_callbacks_pending) = false;
 
diff --git a/src/script/signingprovider.h b/src/script/signingprovider.h
index c40fecac5c..6ad20480a7 100644
--- a/src/script/signingprovider.h
+++ b/src/script/signingprovider.h
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -72,7 +72,7 @@ protected:
     void ImplicitlyLearnRelatedKeyScripts(const CPubKey& pubkey) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
 
 public:
-    mutable CCriticalSection cs_KeyStore;
+    mutable RecursiveMutex cs_KeyStore;
 
     virtual bool AddKeyPubKey(const CKey& key, const CPubKey &pubkey);
     virtual bool AddKey(const CKey &key) { return AddKeyPubKey(key, key.GetPubKey()); }
diff --git a/src/script/standard.h b/src/script/standard.h
index 350a5603d5..e0defaf106 100644
--- a/src/script/standard.h
+++ b/src/script/standard.h
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/sync.cpp b/src/sync.cpp
index 3c88becb6a..924e7b5bb0 100644
--- a/src/sync.cpp
+++ b/src/sync.cpp
@@ -1,4 +1,4 @@
-// Copyright (c) 2011-2019 The Bitcoin Core developers
+// Copyright (c) 2011-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -75,7 +75,7 @@ typedef std::set<std::pair<void*, void*> > InvLockOrders;
 struct LockData {
     // Very ugly hack: as the global constructs and destructors run single
     // threaded, we use this boolean to know whether LockData still exists,
-    // as DeleteLock can get called by global CCriticalSection destructors
+    // as DeleteLock can get called by global RecursiveMutex destructors
     // after LockData disappears.
     bool available;
     LockData() : available(true) {}
diff --git a/src/sync.h b/src/sync.h
index bd32a8bb61..0cdbb59c70 100644
--- a/src/sync.h
+++ b/src/sync.h
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -106,7 +106,6 @@ public:
  * TODO: We should move away from using the recursive lock by default.
  */
 using RecursiveMutex = AnnotatedMixin<std::recursive_mutex>;
-typedef AnnotatedMixin<std::recursive_mutex> CCriticalSection;
 
 /** Wrapped mutex: supports waiting but not recursive locking */
 typedef AnnotatedMixin<std::mutex> Mutex;
diff --git a/src/test/denialofservice_tests.cpp b/src/test/denialofservice_tests.cpp
index 632151793e..2c2b3035e3 100644
--- a/src/test/denialofservice_tests.cpp
+++ b/src/test/denialofservice_tests.cpp
@@ -1,4 +1,4 @@
-// Copyright (c) 2011-2019 The Bitcoin Core developers
+// Copyright (c) 2011-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -51,7 +51,7 @@ struct COrphanTx {
     NodeId fromPeer;
     int64_t nTimeExpire;
 };
-extern CCriticalSection g_cs_orphans;
+extern RecursiveMutex g_cs_orphans;
 extern std::map<uint256, COrphanTx> mapOrphanTransactions GUARDED_BY(g_cs_orphans);
 
 static CService ip(uint32_t i)
diff --git a/src/test/sync_tests.cpp b/src/test/sync_tests.cpp
index 188e9986ff..5c6c2ee38e 100644
--- a/src/test/sync_tests.cpp
+++ b/src/test/sync_tests.cpp
@@ -1,4 +1,4 @@
-// Copyright (c) 2012-2019 The Bitcoin Core developers
+// Copyright (c) 2012-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -38,7 +38,7 @@ BOOST_AUTO_TEST_CASE(potential_deadlock_detected)
     g_debug_lockorder_abort = false;
     #endif
 
-    CCriticalSection rmutex1, rmutex2;
+    RecursiveMutex rmutex1, rmutex2;
     TestPotentialDeadLockDetected(rmutex1, rmutex2);
 
     Mutex mutex1, mutex2;
diff --git a/src/test/txvalidationcache_tests.cpp b/src/test/txvalidationcache_tests.cpp
index 77b4ba62be..c14cd64766 100644
--- a/src/test/txvalidationcache_tests.cpp
+++ b/src/test/txvalidationcache_tests.cpp
@@ -1,4 +1,4 @@
-// Copyright (c) 2011-2019 The Bitcoin Core developers
+// Copyright (c) 2011-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/test/util_tests.cpp b/src/test/util_tests.cpp
index 86ea56ff36..6f0e464891 100644
--- a/src/test/util_tests.cpp
+++ b/src/test/util_tests.cpp
@@ -1,4 +1,4 @@
-// Copyright (c) 2011-2019 The Bitcoin Core developers
+// Copyright (c) 2011-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -38,7 +38,7 @@ BOOST_FIXTURE_TEST_SUITE(util_tests, BasicTestingSetup)
 
 BOOST_AUTO_TEST_CASE(util_criticalsection)
 {
-    CCriticalSection cs;
+    RecursiveMutex cs;
 
     do {
         LOCK(cs);
diff --git a/src/timedata.cpp b/src/timedata.cpp
index b6163631fd..942b3cb919 100644
--- a/src/timedata.cpp
+++ b/src/timedata.cpp
@@ -1,4 +1,4 @@
-// Copyright (c) 2014-2019 The Bitcoin Core developers
+// Copyright (c) 2014-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -16,7 +16,7 @@
 #include <warnings.h>
 
 
-static CCriticalSection cs_nTimeOffset;
+static RecursiveMutex cs_nTimeOffset;
 static int64_t nTimeOffset GUARDED_BY(cs_nTimeOffset) = 0;
 
 /**
diff --git a/src/txdb.h b/src/txdb.h
index d661fbc49e..488c24f935 100644
--- a/src/txdb.h
+++ b/src/txdb.h
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/txmempool.h b/src/txmempool.h
index e9f1f1c8a1..01db59e859 100644
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -30,7 +30,7 @@
 #include <boost/signals2/signal.hpp>
 
 class CBlockIndex;
-extern CCriticalSection cs_main;
+extern RecursiveMutex cs_main;
 
 /** Fake height value used in Coin to signify they are only in the memory pool (since 0.8) */
 static const uint32_t MEMPOOL_HEIGHT = 0x7FFFFFFF;
diff --git a/src/ui_interface.cpp b/src/ui_interface.cpp
index 63ba9b255f..85bb746d19 100644
--- a/src/ui_interface.cpp
+++ b/src/ui_interface.cpp
@@ -1,4 +1,4 @@
-// Copyright (c) 2010-2019 The Bitcoin Core developers
+// Copyright (c) 2010-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/ui_interface.h b/src/ui_interface.h
index 65721006ea..b402177b85 100644
--- a/src/ui_interface.h
+++ b/src/ui_interface.h
@@ -1,5 +1,5 @@
 // Copyright (c) 2010 Satoshi Nakamoto
-// Copyright (c) 2012-2019 The Bitcoin Core developers
+// Copyright (c) 2012-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/util/bip32.cpp b/src/util/bip32.cpp
index 571c6ec5e1..6f176dd5ec 100644
--- a/src/util/bip32.cpp
+++ b/src/util/bip32.cpp
@@ -1,4 +1,4 @@
-// Copyright (c) 2019-2018 The Bitcoin Core developers
+// Copyright (c) 2019 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/util/bip32.h b/src/util/bip32.h
index c93940e4eb..7e58b79f38 100644
--- a/src/util/bip32.h
+++ b/src/util/bip32.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2019-2018 The Bitcoin Core developers
+// Copyright (c) 2019 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/util/settings.h b/src/util/settings.h
index 8d092ece8f..1d03639fa2 100644
--- a/src/util/settings.h
+++ b/src/util/settings.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2019 The Bitcoin Core developers
+// Copyright (c) 2019-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/util/system.cpp b/src/util/system.cpp
index 8d1efc170a..d1bd1de5d1 100644
--- a/src/util/system.cpp
+++ b/src/util/system.cpp
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/util/system.h b/src/util/system.h
index 394adb9555..473019bbed 100644
--- a/src/util/system.h
+++ b/src/util/system.h
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -155,7 +155,7 @@ protected:
         unsigned int m_flags;
     };
 
-    mutable CCriticalSection cs_args;
+    mutable RecursiveMutex cs_args;
     util::Settings m_settings GUARDED_BY(cs_args);
     std::string m_network GUARDED_BY(cs_args);
     std::set<std::string> m_network_only_args GUARDED_BY(cs_args);
diff --git a/src/util/validation.cpp b/src/util/validation.cpp
index ed9c108bb0..89bc6665a4 100644
--- a/src/util/validation.cpp
+++ b/src/util/validation.cpp
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/validation.cpp b/src/validation.cpp
index 755f8d43f9..9854740e6f 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -133,7 +133,7 @@ CTxMemPool mempool(&feeEstimator);
 namespace {
     CBlockIndex* pindexBestInvalid = nullptr;
 
-    CCriticalSection cs_LastBlockFile;
+    RecursiveMutex cs_LastBlockFile;
     std::vector<CBlockFileInfo> vinfoBlockFile;
     int nLastBlockFile = 0;
     /** Global flag to indicate we should check to see if there are
diff --git a/src/validation.h b/src/validation.h
index 81b2ccffc2..a5335edc43 100644
--- a/src/validation.h
+++ b/src/validation.h
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -136,7 +136,7 @@ struct BlockHasher
     size_t operator()(const uint256& hash) const { return ReadLE64(hash.begin()); }
 };
 
-extern CCriticalSection cs_main;
+extern RecursiveMutex cs_main;
 extern CBlockPolicyEstimator feeEstimator;
 extern CTxMemPool mempool;
 typedef std::unordered_map<uint256, CBlockIndex*, BlockHasher> BlockMap;
@@ -560,7 +560,7 @@ private:
      * Every received block is assigned a unique and increasing identifier, so we
      * know which one to give priority in case of a fork.
      */
-    CCriticalSection cs_nBlockSequenceId;
+    RecursiveMutex cs_nBlockSequenceId;
     /** Blocks loaded from disk are assigned id 0, so start the counter at 1. */
     int32_t nBlockSequenceId = 1;
     /** Decreasing counter (used by subsequent preciousblock calls). */
@@ -572,7 +572,7 @@ private:
      * the ChainState CriticalSection
      * A lock that must be held when modifying this ChainState - held in ActivateBestChain()
      */
-    CCriticalSection m_cs_chainstate;
+    RecursiveMutex m_cs_chainstate;
 
     /**
      * Whether this chainstate is undergoing initial block download.
diff --git a/src/validationinterface.cpp b/src/validationinterface.cpp
index 6d5232cc89..0f513c065f 100644
--- a/src/validationinterface.cpp
+++ b/src/validationinterface.cpp
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/validationinterface.h b/src/validationinterface.h
index 25e14b5d0e..ed6c560944 100644
--- a/src/validationinterface.h
+++ b/src/validationinterface.h
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -12,7 +12,7 @@
 #include <functional>
 #include <memory>
 
-extern CCriticalSection cs_main;
+extern RecursiveMutex cs_main;
 class BlockValidationState;
 class CBlock;
 class CBlockIndex;
diff --git a/src/wallet/db.cpp b/src/wallet/db.cpp
index 79825847c8..8b042162d8 100644
--- a/src/wallet/db.cpp
+++ b/src/wallet/db.cpp
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -44,7 +44,7 @@ void CheckUniqueFileid(const BerkeleyEnvironment& env, const std::string& filena
     }
 }
 
-CCriticalSection cs_db;
+RecursiveMutex cs_db;
 std::map<std::string, std::weak_ptr<BerkeleyEnvironment>> g_dbenvs GUARDED_BY(cs_db); //!< Map from directory name to db environment.
 } // namespace
 
@@ -650,7 +650,7 @@ void BerkeleyEnvironment::ReloadDbEnv()
 {
     // Make sure that no Db's are in use
     AssertLockNotHeld(cs_db);
-    std::unique_lock<CCriticalSection> lock(cs_db);
+    std::unique_lock<RecursiveMutex> lock(cs_db);
     m_db_in_use.wait(lock, [this](){
         for (auto& count : mapFileUseCount) {
             if (count.second > 0) return false;
diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index 85793ef180..05719b4754 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -1,5 +1,5 @@
 // Copyright (c) 2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/src/wallet/scriptpubkeyman.h b/src/wallet/scriptpubkeyman.h
index b78494921c..8b50711280 100644
--- a/src/wallet/scriptpubkeyman.h
+++ b/src/wallet/scriptpubkeyman.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2019 The Bitcoin Core developers
+// Copyright (c) 2019-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -420,7 +420,7 @@ public:
     void NotifyCanGetAddressesChanged() const;
     template<typename... Params> void WalletLogPrintf(const std::string& fmt, const Params&... parameters) const;
     CWallet& m_wallet;
-    CCriticalSection& cs_wallet;
+    RecursiveMutex& cs_wallet;
 };
 
 #endif // BITCOIN_WALLET_SCRIPTPUBKEYMAN_H
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 559b26aa84..99dff900cc 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -45,7 +45,7 @@ const std::map<uint64_t,std::string> WALLET_FLAG_CAVEATS{
 
 static const size_t OUTPUT_GROUP_MAX_ENTRIES = 10;
 
-static CCriticalSection cs_wallets;
+static RecursiveMutex cs_wallets;
 static std::vector<std::shared_ptr<CWallet>> vpwallets GUARDED_BY(cs_wallets);
 static std::list<LoadWalletFn> g_load_wallet_fns GUARDED_BY(cs_wallets);
 
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index c86367dc0f..1f81e34322 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Copyright (c) 2009-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -699,7 +699,7 @@ public:
      * Main wallet lock.
      * This lock protects all the fields added by CWallet.
      */
-    mutable CCriticalSection cs_wallet;
+    mutable RecursiveMutex cs_wallet;
 
     /** Get database handle used by this wallet. Ideally this function would
      * not be necessary.
@@ -1133,7 +1133,7 @@ public:
     // Temporary LegacyScriptPubKeyMan accessors and aliases.
     friend class LegacyScriptPubKeyMan;
     std::unique_ptr<LegacyScriptPubKeyMan> m_spk_man = MakeUnique<LegacyScriptPubKeyMan>(*this);
-    CCriticalSection& cs_KeyStore = m_spk_man->cs_KeyStore;
+    RecursiveMutex& cs_KeyStore = m_spk_man->cs_KeyStore;
     LegacyScriptPubKeyMan::KeyMap& mapKeys GUARDED_BY(cs_KeyStore) = m_spk_man->mapKeys;
     LegacyScriptPubKeyMan::ScriptMap& mapScripts GUARDED_BY(cs_KeyStore) = m_spk_man->mapScripts;
     LegacyScriptPubKeyMan::CryptedKeyMap& mapCryptedKeys GUARDED_BY(cs_KeyStore) = m_spk_man->mapCryptedKeys;
diff --git a/src/zmq/zmqpublishnotifier.cpp b/src/zmq/zmqpublishnotifier.cpp
index 344a7321f9..04806903c2 100644
--- a/src/zmq/zmqpublishnotifier.cpp
+++ b/src/zmq/zmqpublishnotifier.cpp
@@ -1,4 +1,4 @@
-// Copyright (c) 2015-2019 The Bitcoin Core developers
+// Copyright (c) 2015-2020 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/test/functional/feature_config_args.py b/test/functional/feature_config_args.py
index d1a4cda7a0..003a74184b 100755
--- a/test/functional/feature_config_args.py
+++ b/test/functional/feature_config_args.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-# Copyright (c) 2017-2019 The Bitcoin Core developers
+# Copyright (c) 2017-2020 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Test various command line arguments and configuration file parameters."""
diff --git a/test/functional/rpc_getaddressinfo_labels_purpose_deprecation.py b/test/functional/rpc_getaddressinfo_labels_purpose_deprecation.py
index 1049440d49..193900dba2 100755
--- a/test/functional/rpc_getaddressinfo_labels_purpose_deprecation.py
+++ b/test/functional/rpc_getaddressinfo_labels_purpose_deprecation.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-# Copyright (c) 2020 The Bitcoin Core developers
+# Copyright (c) 2020-2019 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """
diff --git a/test/functional/test_framework/wallet_util.py b/test/functional/test_framework/wallet_util.py
index 487acd75d9..eb537015fb 100755
--- a/test/functional/test_framework/wallet_util.py
+++ b/test/functional/test_framework/wallet_util.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-# Copyright (c) 2018-2019 The Bitcoin Core developers
+# Copyright (c) 2018-2020 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Useful util functions for testing the wallet"""
diff --git a/test/functional/wallet_avoidreuse.py b/test/functional/wallet_avoidreuse.py
index 0ca8c80956..6c0c06df73 100755
--- a/test/functional/wallet_avoidreuse.py
+++ b/test/functional/wallet_avoidreuse.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-# Copyright (c) 2018-2019 The Bitcoin Core developers
+# Copyright (c) 2018-2020 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Test the avoid_reuse and setwalletflag features."""
diff --git a/test/functional/wallet_import_with_label.py b/test/functional/wallet_import_with_label.py
index 64d227b30f..f3a28785ce 100755
--- a/test/functional/wallet_import_with_label.py
+++ b/test/functional/wallet_import_with_label.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-# Copyright (c) 2018-2019 The Bitcoin Core developers
+# Copyright (c) 2018-2020 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Test the behavior of RPC importprivkey on set and unset labels of
diff --git a/test/functional/wallet_labels.py b/test/functional/wallet_labels.py
index f795202d72..037a09b05f 100755
--- a/test/functional/wallet_labels.py
+++ b/test/functional/wallet_labels.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-# Copyright (c) 2016-2019 The Bitcoin Core developers
+# Copyright (c) 2016-2020 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Test label RPCs.
diff --git a/test/lint/extended-lint-all.sh b/test/lint/extended-lint-all.sh
index 1cdd52621b..65c51e02f5 100755
--- a/test/lint/extended-lint-all.sh
+++ b/test/lint/extended-lint-all.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# Copyright (c) 2019-2018 The Bitcoin Core developers
+# Copyright (c) 2019 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 #
diff --git a/test/lint/extended-lint-cppcheck.sh b/test/lint/extended-lint-cppcheck.sh
index 06c11ebba9..47df25ba6b 100755
--- a/test/lint/extended-lint-cppcheck.sh
+++ b/test/lint/extended-lint-cppcheck.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# Copyright (c) 2019-2018 The Bitcoin Core developers
+# Copyright (c) 2019 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 #