From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Fri, 6 Apr 2012 16:39:12 +0000 (+0200)
Subject: Use scoped locks instead of CRITICAL_BLOCK
X-Git-Tag: v0.4.0-unstable~129^2~96^2~2
X-Git-Url: https://git.novaco.in/?p=novacoin.git;a=commitdiff_plain;h=f8dcd5ca6f55ad49807cf7491c1f153f6158400e

Use scoped locks instead of CRITICAL_BLOCK
---

diff --git a/src/addrman.h b/src/addrman.h
index 91e1f87..7652df6 100644
--- a/src/addrman.h
+++ b/src/addrman.h
@@ -266,8 +266,8 @@ public:
         //
         // This format is more complex, but significantly smaller (at most 1.5 MiB), and supports
         // changes to the ADDRMAN_ parameters without breaking the on-disk structure.
-        CRITICAL_BLOCK(cs)
         {
+            LOCK(cs);
             unsigned char nVersion = 0;
             READWRITE(nVersion);
             READWRITE(nKey);
@@ -398,8 +398,8 @@ public:
     void Check()
     {
 #ifdef DEBUG_ADDRMAN
-        CRITICAL_BLOCK(cs)
         {
+            LOCK(cs);
             int err;
             if ((err=Check_()))
                 printf("ADDRMAN CONSISTENCY CHECK FAILED!!! err=%i\n", err);
@@ -411,8 +411,8 @@ public:
     bool Add(const CAddress &addr, const CNetAddr& source, int64 nTimePenalty = 0)
     {
         bool fRet = false;
-        CRITICAL_BLOCK(cs)
         {
+            LOCK(cs);
             Check();
             fRet |= Add_(addr, source, nTimePenalty);
             Check();
@@ -426,8 +426,8 @@ public:
     bool Add(const std::vector<CAddress> &vAddr, const CNetAddr& source, int64 nTimePenalty = 0)
     {
         int nAdd = 0;
-        CRITICAL_BLOCK(cs)
         {
+            LOCK(cs);
             Check();
             for (std::vector<CAddress>::const_iterator it = vAddr.begin(); it != vAddr.end(); it++)
                 nAdd += Add_(*it, source, nTimePenalty) ? 1 : 0;
@@ -441,8 +441,8 @@ public:
     // Mark an entry as accessible.
     void Good(const CService &addr, int64 nTime = GetAdjustedTime())
     {
-        CRITICAL_BLOCK(cs)
         {
+            LOCK(cs);
             Check();
             Good_(addr, nTime);
             Check();
@@ -452,8 +452,8 @@ public:
     // Mark an entry as connection attempted to.
     void Attempt(const CService &addr, int64 nTime = GetAdjustedTime())
     {
-        CRITICAL_BLOCK(cs)
         {
+            LOCK(cs);
             Check();
             Attempt_(addr, nTime);
             Check();
@@ -465,8 +465,8 @@ public:
     CAddress Select(int nUnkBias = 50)
     {
         CAddress addrRet;
-        CRITICAL_BLOCK(cs)
         {
+            LOCK(cs);
             Check();
             addrRet = Select_(nUnkBias);
             Check();
@@ -479,8 +479,10 @@ public:
     {
         Check();
         std::vector<CAddress> vAddr;
-        CRITICAL_BLOCK(cs)
+        {
+            LOCK(cs);
             GetAddr_(vAddr);
+        }
         Check();
         return vAddr;
     }
@@ -488,8 +490,8 @@ public:
     // Mark an entry as currently-connected-to.
     void Connected(const CService &addr, int64 nTime = GetAdjustedTime())
     {
-        CRITICAL_BLOCK(cs)
         {
+            LOCK(cs);
             Check();
             Connected_(addr, nTime);
             Check();
diff --git a/src/bitcoinrpc.cpp b/src/bitcoinrpc.cpp
index 8cd4750..2001051 100644
--- a/src/bitcoinrpc.cpp
+++ b/src/bitcoinrpc.cpp
@@ -1648,8 +1648,8 @@ Value walletlock(const Array& params, bool fHelp)
     if (!pwalletMain->IsCrypted())
         throw JSONRPCError(-15, "Error: running with an unencrypted wallet, but walletlock was called.");
 
-    CRITICAL_BLOCK(cs_nWalletUnlockTime)
     {
+        LOCK(cs_nWalletUnlockTime);
         pwalletMain->Lock();
         nWalletUnlockTime = 0;
     }
@@ -2498,9 +2498,10 @@ void ThreadRPCServer2(void* parg)
             {
                 // Execute
                 Value result;
-                CRITICAL_BLOCK(cs_main)
-                CRITICAL_BLOCK(pwalletMain->cs_wallet)
+                {
+                    LOCK2(cs_main, pwalletMain->cs_wallet);
                     result = (*(*mi).second)(params, false);
+                }
 
                 // Send reply
                 string strReply = JSONRPCReply(result, Value::null, id);
diff --git a/src/db.cpp b/src/db.cpp
index b86a56e..52db39a 100644
--- a/src/db.cpp
+++ b/src/db.cpp
@@ -72,8 +72,8 @@ CDB::CDB(const char* pszFile, const char* pszMode) : pdb(NULL)
     if (fCreate)
         nFlags |= DB_CREATE;
 
-    CRITICAL_BLOCK(cs_db)
     {
+        LOCK(cs_db);
         if (!fDbEnvInit)
         {
             if (fShutdown)
@@ -126,8 +126,10 @@ CDB::CDB(const char* pszFile, const char* pszMode) : pdb(NULL)
             {
                 delete pdb;
                 pdb = NULL;
-                CRITICAL_BLOCK(cs_db)
+                {
+                     LOCK(cs_db);
                     --mapFileUseCount[strFile];
+                }
                 strFile = "";
                 throw runtime_error(strprintf("CDB() : can't open database file %s, error %d", pszFile, ret));
             }
@@ -165,14 +167,16 @@ void CDB::Close()
 
     dbenv.txn_checkpoint(nMinutes ? GetArg("-dblogsize", 100)*1024 : 0, nMinutes, 0);
 
-    CRITICAL_BLOCK(cs_db)
+    {
+        LOCK(cs_db);
         --mapFileUseCount[strFile];
+    }
 }
 
 void static CloseDb(const string& strFile)
 {
-    CRITICAL_BLOCK(cs_db)
     {
+        LOCK(cs_db);
         if (mapDb[strFile] != NULL)
         {
             // Close the database handle
@@ -188,8 +192,8 @@ bool CDB::Rewrite(const string& strFile, const char* pszSkip)
 {
     while (!fShutdown)
     {
-        CRITICAL_BLOCK(cs_db)
         {
+            LOCK(cs_db);
             if (!mapFileUseCount.count(strFile) || mapFileUseCount[strFile] == 0)
             {
                 // Flush log data to the dat file
@@ -286,8 +290,8 @@ void DBFlush(bool fShutdown)
     printf("DBFlush(%s)%s\n", fShutdown ? "true" : "false", fDbEnvInit ? "" : " db not started");
     if (!fDbEnvInit)
         return;
-    CRITICAL_BLOCK(cs_db)
     {
+        LOCK(cs_db);
         map<string, int>::iterator mi = mapFileUseCount.begin();
         while (mi != mapFileUseCount.end())
         {
@@ -877,8 +881,8 @@ int CWalletDB::LoadWallet(CWallet* pwallet)
     bool fIsEncrypted = false;
 
     //// todo: shouldn't we catch exceptions and try to recover and continue?
-    CRITICAL_BLOCK(pwallet->cs_wallet)
     {
+        LOCK(pwallet->cs_wallet);
         int nMinVersion = 0;
         if (Read((string)"minversion", nMinVersion))
         {
@@ -1119,7 +1123,8 @@ void ThreadFlushWalletDB(void* parg)
 
         if (nLastFlushed != nWalletDBUpdated && GetTime() - nLastWalletUpdate >= 2)
         {
-            TRY_CRITICAL_BLOCK(cs_db)
+            TRY_LOCK(cs_db,lockDb);
+            if (lockDb)
             {
                 // Don't do this if any databases are in use
                 int nRefCount = 0;
@@ -1160,8 +1165,8 @@ bool BackupWallet(const CWallet& wallet, const string& strDest)
         return false;
     while (!fShutdown)
     {
-        CRITICAL_BLOCK(cs_db)
         {
+            LOCK(cs_db);
             if (!mapFileUseCount.count(wallet.strWalletFile) || mapFileUseCount[wallet.strWalletFile] == 0)
             {
                 // Flush log data to the dat file
diff --git a/src/init.cpp b/src/init.cpp
index 3f900fc..a1e45b1 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -40,10 +40,13 @@ void Shutdown(void* parg)
     static CCriticalSection cs_Shutdown;
     static bool fTaken;
     bool fFirstThread = false;
-    TRY_CRITICAL_BLOCK(cs_Shutdown)
     {
-        fFirstThread = !fTaken;
-        fTaken = true;
+        TRY_LOCK(cs_Shutdown, lockShutdown);
+        if (lockShutdown)
+        {
+            fFirstThread = !fTaken;
+            fTaken = true;
+        }
     }
     static bool fExit;
     if (fFirstThread)
diff --git a/src/keystore.cpp b/src/keystore.cpp
index 23f9e32..7b46f6b 100644
--- a/src/keystore.cpp
+++ b/src/keystore.cpp
@@ -21,31 +21,37 @@ bool CBasicKeyStore::AddKey(const CKey& key)
 {
     bool fCompressed = false;
     CSecret secret = key.GetSecret(fCompressed);
-    CRITICAL_BLOCK(cs_KeyStore)
+    {
+        LOCK(cs_KeyStore);
         mapKeys[CBitcoinAddress(key.GetPubKey())] = make_pair(secret, fCompressed);
+    }
     return true;
 }
 
 bool CBasicKeyStore::AddCScript(const CScript& redeemScript)
 {
-    CRITICAL_BLOCK(cs_KeyStore)
+    {
+        LOCK(cs_KeyStore);
         mapScripts[Hash160(redeemScript)] = redeemScript;
+    }
     return true;
 }
 
 bool CBasicKeyStore::HaveCScript(const uint160& hash) const
 {
     bool result;
-    CRITICAL_BLOCK(cs_KeyStore)
+    {
+        LOCK(cs_KeyStore);
         result = (mapScripts.count(hash) > 0);
+    }
     return result;
 }
 
 
 bool CBasicKeyStore::GetCScript(const uint160 &hash, CScript& redeemScriptOut) const
 {
-    CRITICAL_BLOCK(cs_KeyStore)
     {
+        LOCK(cs_KeyStore);
         ScriptMap::const_iterator mi = mapScripts.find(hash);
         if (mi != mapScripts.end())
         {
@@ -58,8 +64,8 @@ bool CBasicKeyStore::GetCScript(const uint160 &hash, CScript& redeemScriptOut) c
 
 bool CCryptoKeyStore::SetCrypted()
 {
-    CRITICAL_BLOCK(cs_KeyStore)
     {
+        LOCK(cs_KeyStore);
         if (fUseCrypto)
             return true;
         if (!mapKeys.empty())
@@ -71,8 +77,8 @@ bool CCryptoKeyStore::SetCrypted()
 
 bool CCryptoKeyStore::Unlock(const CKeyingMaterial& vMasterKeyIn)
 {
-    CRITICAL_BLOCK(cs_KeyStore)
     {
+        LOCK(cs_KeyStore);
         if (!SetCrypted())
             return false;
 
@@ -100,8 +106,8 @@ bool CCryptoKeyStore::Unlock(const CKeyingMaterial& vMasterKeyIn)
 
 bool CCryptoKeyStore::AddKey(const CKey& key)
 {
-    CRITICAL_BLOCK(cs_KeyStore)
     {
+        LOCK(cs_KeyStore);
         if (!IsCrypted())
             return CBasicKeyStore::AddKey(key);
 
@@ -123,8 +129,8 @@ bool CCryptoKeyStore::AddKey(const CKey& key)
 
 bool CCryptoKeyStore::AddCryptedKey(const std::vector<unsigned char> &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret)
 {
-    CRITICAL_BLOCK(cs_KeyStore)
     {
+        LOCK(cs_KeyStore);
         if (!SetCrypted())
             return false;
 
@@ -135,8 +141,8 @@ bool CCryptoKeyStore::AddCryptedKey(const std::vector<unsigned char> &vchPubKey,
 
 bool CCryptoKeyStore::GetKey(const CBitcoinAddress &address, CKey& keyOut) const
 {
-    CRITICAL_BLOCK(cs_KeyStore)
     {
+        LOCK(cs_KeyStore);
         if (!IsCrypted())
             return CBasicKeyStore::GetKey(address, keyOut);
 
@@ -160,8 +166,8 @@ bool CCryptoKeyStore::GetKey(const CBitcoinAddress &address, CKey& keyOut) const
 
 bool CCryptoKeyStore::GetPubKey(const CBitcoinAddress &address, std::vector<unsigned char>& vchPubKeyOut) const
 {
-    CRITICAL_BLOCK(cs_KeyStore)
     {
+        LOCK(cs_KeyStore);
         if (!IsCrypted())
             return CKeyStore::GetPubKey(address, vchPubKeyOut);
 
@@ -177,8 +183,8 @@ bool CCryptoKeyStore::GetPubKey(const CBitcoinAddress &address, std::vector<unsi
 
 bool CCryptoKeyStore::EncryptKeys(CKeyingMaterial& vMasterKeyIn)
 {
-    CRITICAL_BLOCK(cs_KeyStore)
     {
+        LOCK(cs_KeyStore);
         if (!mapCryptedKeys.empty() || IsCrypted())
             return false;
 
diff --git a/src/keystore.h b/src/keystore.h
index c32db26..282eaaa 100644
--- a/src/keystore.h
+++ b/src/keystore.h
@@ -54,15 +54,17 @@ public:
     bool HaveKey(const CBitcoinAddress &address) const
     {
         bool result;
-        CRITICAL_BLOCK(cs_KeyStore)
+        {
+            LOCK(cs_KeyStore);
             result = (mapKeys.count(address) > 0);
+        }
         return result;
     }
     void GetKeys(std::set<CBitcoinAddress> &setAddress) const
     {
         setAddress.clear();
-        CRITICAL_BLOCK(cs_KeyStore)
         {
+            LOCK(cs_KeyStore);
             KeyMap::const_iterator mi = mapKeys.begin();
             while (mi != mapKeys.end())
             {
@@ -73,8 +75,8 @@ public:
     }
     bool GetKey(const CBitcoinAddress &address, CKey &keyOut) const
     {
-        CRITICAL_BLOCK(cs_KeyStore)
         {
+            LOCK(cs_KeyStore);
             KeyMap::const_iterator mi = mapKeys.find(address);
             if (mi != mapKeys.end())
             {
@@ -129,8 +131,10 @@ public:
         if (!IsCrypted())
             return false;
         bool result;
-        CRITICAL_BLOCK(cs_KeyStore)
+        {
+            LOCK(cs_KeyStore);
             result = vMasterKey.empty();
+        }
         return result;
     }
 
@@ -139,8 +143,10 @@ public:
         if (!SetCrypted())
             return false;
 
-        CRITICAL_BLOCK(cs_KeyStore)
+        {
+            LOCK(cs_KeyStore);
             vMasterKey.clear();
+        }
 
         return true;
     }
@@ -149,8 +155,8 @@ public:
     bool AddKey(const CKey& key);
     bool HaveKey(const CBitcoinAddress &address) const
     {
-        CRITICAL_BLOCK(cs_KeyStore)
         {
+            LOCK(cs_KeyStore);
             if (!IsCrypted())
                 return CBasicKeyStore::HaveKey(address);
             return mapCryptedKeys.count(address) > 0;
diff --git a/src/main.cpp b/src/main.cpp
index 7c49316..dea60f0 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -75,16 +75,16 @@ int64 nTransactionFee = 0;
 
 void RegisterWallet(CWallet* pwalletIn)
 {
-    CRITICAL_BLOCK(cs_setpwalletRegistered)
     {
+        LOCK(cs_setpwalletRegistered);
         setpwalletRegistered.insert(pwalletIn);
     }
 }
 
 void UnregisterWallet(CWallet* pwalletIn)
 {
-    CRITICAL_BLOCK(cs_setpwalletRegistered)
     {
+        LOCK(cs_setpwalletRegistered);
         setpwalletRegistered.erase(pwalletIn);
     }
 }
@@ -478,9 +478,11 @@ bool CTransaction::AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs, bool* pfMi
 
     // Do we already have it?
     uint256 hash = GetHash();
-    CRITICAL_BLOCK(cs_mapTransactions)
+    {
+        LOCK(cs_mapTransactions);
         if (mapTransactions.count(hash))
             return false;
+    }
     if (fCheckInputs)
         if (txdb.ContainsTx(hash))
             return false;
@@ -552,8 +554,8 @@ bool CTransaction::AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs, bool* pfMi
             static int64 nLastTime;
             int64 nNow = GetTime();
 
-            CRITICAL_BLOCK(cs)
             {
+                LOCK(cs);
                 // Use an exponentially decaying ~10-minute window:
                 dFreeCount *= pow(1.0 - 1.0/600.0, (double)(nNow - nLastTime));
                 nLastTime = nNow;
@@ -576,8 +578,8 @@ bool CTransaction::AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs, bool* pfMi
     }
 
     // Store transaction in memory
-    CRITICAL_BLOCK(cs_mapTransactions)
     {
+        LOCK(cs_mapTransactions);
         if (ptxOld)
         {
             printf("AcceptToMemoryPool() : replacing tx %s with new version\n", ptxOld->GetHash().ToString().c_str());
@@ -608,8 +610,8 @@ bool CTransaction::AddToMemoryPoolUnchecked()
     printf("AcceptToMemoryPoolUnchecked(): size %lu\n",  mapTransactions.size());
     // Add to memory pool without checking anything.  Don't call this directly,
     // call AcceptToMemoryPool to properly check the transaction first.
-    CRITICAL_BLOCK(cs_mapTransactions)
     {
+        LOCK(cs_mapTransactions);
         uint256 hash = GetHash();
         mapTransactions[hash] = *this;
         for (int i = 0; i < vin.size(); i++)
@@ -624,8 +626,8 @@ bool CTransaction::AddToMemoryPoolUnchecked()
 bool CTransaction::RemoveFromMemoryPool()
 {
     // Remove transaction from memory pool
-    CRITICAL_BLOCK(cs_mapTransactions)
     {
+        LOCK(cs_mapTransactions);
         uint256 hash = GetHash();
         if (mapTransactions.count(hash))
         {
@@ -702,8 +704,9 @@ bool CMerkleTx::AcceptToMemoryPool()
 
 bool CWalletTx::AcceptWalletTransaction(CTxDB& txdb, bool fCheckInputs)
 {
-    CRITICAL_BLOCK(cs_mapTransactions)
+
     {
+        LOCK(cs_mapTransactions);
         // Add previous supporting transactions first
         BOOST_FOREACH(CMerkleTx& tx, vtxPrev)
         {
@@ -1024,8 +1027,8 @@ bool CTransaction::FetchInputs(CTxDB& txdb, const map<uint256, CTxIndex>& mapTes
         if (!fFound || txindex.pos == CDiskTxPos(1,1,1))
         {
             // Get prev tx from single transactions in memory
-            CRITICAL_BLOCK(cs_mapTransactions)
             {
+                LOCK(cs_mapTransactions);
                 if (!mapTransactions.count(prevout.hash))
                     return error("FetchInputs() : %s mapTransactions prev not found %s", GetHash().ToString().substr(0,10).c_str(),  prevout.hash.ToString().substr(0,10).c_str());
                 txPrev = mapTransactions[prevout.hash];
@@ -1190,8 +1193,8 @@ bool CTransaction::ClientConnectInputs()
         return false;
 
     // Take over previous transactions' spent pointers
-    CRITICAL_BLOCK(cs_mapTransactions)
     {
+        LOCK(cs_mapTransactions);
         int64 nValueIn = 0;
         for (int i = 0; i < vin.size(); i++)
         {
@@ -1707,10 +1710,12 @@ bool CBlock::AcceptBlock()
     // Relay inventory, but don't relay old inventory during initial block download
     int nBlockEstimate = Checkpoints::GetTotalBlocksEstimate();
     if (hashBestChain == hash)
-        CRITICAL_BLOCK(cs_vNodes)
-            BOOST_FOREACH(CNode* pnode, vNodes)
-                if (nBestHeight > (pnode->nStartingHeight != -1 ? pnode->nStartingHeight - 2000 : nBlockEstimate))
-                    pnode->PushInventory(CInv(MSG_BLOCK, hash));
+    {
+        LOCK(cs_vNodes);
+        BOOST_FOREACH(CNode* pnode, vNodes)
+            if (nBestHeight > (pnode->nStartingHeight != -1 ? pnode->nStartingHeight - 2000 : nBlockEstimate))
+                pnode->PushInventory(CInv(MSG_BLOCK, hash));
+    }
 
     return true;
 }
@@ -2052,8 +2057,8 @@ string GetWarnings(string strFor)
     }
 
     // Alerts
-    CRITICAL_BLOCK(cs_mapAlerts)
     {
+        LOCK(cs_mapAlerts);
         BOOST_FOREACH(PAIRTYPE(const uint256, CAlert)& item, mapAlerts)
         {
             const CAlert& alert = item.second;
@@ -2080,8 +2085,8 @@ bool CAlert::ProcessAlert()
     if (!IsInEffect())
         return false;
 
-    CRITICAL_BLOCK(cs_mapAlerts)
     {
+        LOCK(cs_mapAlerts);
         // Cancel previous alerts
         for (map<uint256, CAlert>::iterator mi = mapAlerts.begin(); mi != mapAlerts.end();)
         {
@@ -2260,9 +2265,11 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
         }
 
         // Relay alerts
-        CRITICAL_BLOCK(cs_mapAlerts)
+        {
+            LOCK(cs_mapAlerts);
             BOOST_FOREACH(PAIRTYPE(const uint256, CAlert)& item, mapAlerts)
                 item.second.RelayTo(pfrom);
+        }
 
         pfrom->fSuccessfullyConnected = true;
 
@@ -2316,8 +2323,8 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
             if (addr.nTime > nSince && !pfrom->fGetAddr && vAddr.size() <= 10 && addr.IsRoutable())
             {
                 // Relay to a limited number of other nodes
-                CRITICAL_BLOCK(cs_vNodes)
                 {
+                    LOCK(cs_vNodes);
                     // Use deterministic randomness to send to the same nodes for 24 hours
                     // at a time so the setAddrKnowns of the chosen nodes prevent repeats
                     static uint256 hashSalt;
@@ -2428,8 +2435,8 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
             else if (inv.IsKnownType())
             {
                 // Send stream from relay memory
-                CRITICAL_BLOCK(cs_mapRelay)
                 {
+                    LOCK(cs_mapRelay);
                     map<CInv, CDataStream>::iterator mi = mapRelay.find(inv);
                     if (mi != mapRelay.end())
                         pfrom->PushMessage(inv.GetCommand(), (*mi).second);
@@ -2634,8 +2641,8 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
         vRecv >> hashReply;
 
         CRequestTracker tracker;
-        CRITICAL_BLOCK(pfrom->cs_mapRequests)
         {
+            LOCK(pfrom->cs_mapRequests);
             map<uint256, CRequestTracker>::iterator mi = pfrom->mapRequests.find(hashReply);
             if (mi != pfrom->mapRequests.end())
             {
@@ -2662,9 +2669,11 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
         {
             // Relay
             pfrom->setKnown.insert(alert.GetHash());
-            CRITICAL_BLOCK(cs_vNodes)
+            {
+                LOCK(cs_vNodes);
                 BOOST_FOREACH(CNode* pnode, vNodes)
                     alert.RelayTo(pnode);
+            }
         }
     }
 
@@ -2763,8 +2772,10 @@ bool ProcessMessages(CNode* pfrom)
         bool fRet = false;
         try
         {
-            CRITICAL_BLOCK(cs_main)
+            {
+                LOCK(cs_main);
                 fRet = ProcessMessage(pfrom, strCommand, vMsg);
+            }
             if (fShutdown)
                 return true;
         }
@@ -2802,8 +2813,8 @@ bool ProcessMessages(CNode* pfrom)
 
 bool SendMessages(CNode* pto, bool fSendTrickle)
 {
-    CRITICAL_BLOCK(cs_main)
     {
+        LOCK(cs_main);
         // Don't send anything until we get their version message
         if (pto->nVersion == 0)
             return true;
@@ -2819,8 +2830,8 @@ bool SendMessages(CNode* pto, bool fSendTrickle)
         static int64 nLastRebroadcast;
         if (!IsInitialBlockDownload() && (GetTime() - nLastRebroadcast > 24 * 60 * 60))
         {
-            CRITICAL_BLOCK(cs_vNodes)
             {
+                LOCK(cs_vNodes);
                 BOOST_FOREACH(CNode* pnode, vNodes)
                 {
                     // Periodically clear setAddrKnown to allow refresh broadcasts
@@ -2871,8 +2882,8 @@ bool SendMessages(CNode* pto, bool fSendTrickle)
         //
         vector<CInv> vInv;
         vector<CInv> vInvWait;
-        CRITICAL_BLOCK(pto->cs_inventory)
         {
+            LOCK(pto->cs_inventory);
             vInv.reserve(pto->vInventoryToSend.size());
             vInvWait.reserve(pto->vInventoryToSend.size());
             BOOST_FOREACH(const CInv& inv, pto->vInventoryToSend)
@@ -3087,9 +3098,8 @@ CBlock* CreateNewBlock(CReserveKey& reservekey)
 
     // Collect memory pool transactions into the block
     int64 nFees = 0;
-    CRITICAL_BLOCK(cs_main)
-    CRITICAL_BLOCK(cs_mapTransactions)
     {
+        LOCK2(cs_main, cs_mapTransactions);
         CTxDB txdb("r");
 
         // Priority order to process transactions
@@ -3317,8 +3327,8 @@ bool CheckWork(CBlock* pblock, CWallet& wallet, CReserveKey& reservekey)
     printf("generated %s\n", FormatMoney(pblock->vtx[0].vout[0].nValue).c_str());
 
     // Found a solution
-    CRITICAL_BLOCK(cs_main)
     {
+        LOCK(cs_main);
         if (pblock->hashPrevBlock != hashBestChain)
             return error("BitcoinMiner : generated block is stale");
 
@@ -3326,8 +3336,10 @@ bool CheckWork(CBlock* pblock, CWallet& wallet, CReserveKey& reservekey)
         reservekey.KeepKey();
 
         // Track how many getdata requests this block gets
-        CRITICAL_BLOCK(wallet.cs_wallet)
+        {
+            LOCK(wallet.cs_wallet);
             wallet.mapRequestCount[pblock->GetHash()] = 0;
+        }
 
         // Process this block the same as if we had received it from another node
         if (!ProcessBlock(NULL, pblock))
@@ -3443,8 +3455,8 @@ void static BitcoinMiner(CWallet *pwallet)
             if (GetTimeMillis() - nHPSTimerStart > 4000)
             {
                 static CCriticalSection cs;
-                CRITICAL_BLOCK(cs)
                 {
+                    LOCK(cs);
                     if (GetTimeMillis() - nHPSTimerStart > 4000)
                     {
                         dHashesPerSec = 1000.0 * nHashCounter / (GetTimeMillis() - nHPSTimerStart);
diff --git a/src/net.cpp b/src/net.cpp
index 59bace4..8272b25 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -272,9 +272,11 @@ void ThreadGetMyExternalIP(void* parg)
             // setAddrKnown automatically filters any duplicate sends.
             CAddress addr(addrLocalHost);
             addr.nTime = GetAdjustedTime();
-            CRITICAL_BLOCK(cs_vNodes)
+            {
+                LOCK(cs_vNodes);
                 BOOST_FOREACH(CNode* pnode, vNodes)
                     pnode->PushAddress(addr);
+            }
         }
     }
 }
@@ -296,8 +298,8 @@ void AddressCurrentlyConnected(const CService& addr)
 
 CNode* FindNode(const CNetAddr& ip)
 {
-    CRITICAL_BLOCK(cs_vNodes)
     {
+        LOCK(cs_vNodes);
         BOOST_FOREACH(CNode* pnode, vNodes)
             if ((CNetAddr)pnode->addr == ip)
                 return (pnode);
@@ -307,8 +309,8 @@ CNode* FindNode(const CNetAddr& ip)
 
 CNode* FindNode(const CService& addr)
 {
-    CRITICAL_BLOCK(cs_vNodes)
     {
+        LOCK(cs_vNodes);
         BOOST_FOREACH(CNode* pnode, vNodes)
             if ((CService)pnode->addr == addr)
                 return (pnode);
@@ -362,10 +364,14 @@ CNode* ConnectNode(CAddress addrConnect, int64 nTimeout)
             pnode->AddRef(nTimeout);
         else
             pnode->AddRef();
-        CRITICAL_BLOCK(cs_vNodes)
+        {
+            LOCK(cs_vNodes);
             vNodes.push_back(pnode);
-        WAITABLE_CRITICAL_BLOCK(csOutbound)
+        }
+        {
+            WAITABLE_LOCK(csOutbound);
             nOutbound++;
+        }
 
         pnode->nTimeConnected = GetTime();
         return pnode;
@@ -421,8 +427,8 @@ void CNode::ClearBanned()
 bool CNode::IsBanned(CNetAddr ip)
 {
     bool fResult = false;
-    CRITICAL_BLOCK(cs_setBanned)
     {
+        LOCK(cs_setBanned);
         std::map<CNetAddr, int64>::iterator i = setBanned.find(ip);
         if (i != setBanned.end())
         {
@@ -446,9 +452,11 @@ bool CNode::Misbehaving(int howmuch)
     if (nMisbehavior >= GetArg("-banscore", 100))
     {
         int64 banTime = GetTime()+GetArg("-bantime", 60*60*24);  // Default 24-hour ban
-        CRITICAL_BLOCK(cs_setBanned)
+        {
+            LOCK(cs_setBanned);
             if (setBanned[addr] < banTime)
                 setBanned[addr] = banTime;
+        }
         CloseSocketDisconnect();
         printf("Disconnected %s for misbehavior (score=%d)\n", addr.ToString().c_str(), nMisbehavior);
         return true;
@@ -497,8 +505,8 @@ void ThreadSocketHandler2(void* parg)
         //
         // Disconnect nodes
         //
-        CRITICAL_BLOCK(cs_vNodes)
         {
+            LOCK(cs_vNodes);
             // Disconnect unused nodes
             vector<CNode*> vNodesCopy = vNodes;
             BOOST_FOREACH(CNode* pnode, vNodesCopy)
@@ -510,8 +518,8 @@ void ThreadSocketHandler2(void* parg)
                     vNodes.erase(remove(vNodes.begin(), vNodes.end(), pnode), vNodes.end());
 
                     if (!pnode->fInbound)
-                        WAITABLE_CRITICAL_BLOCK(csOutbound)
                         {
+                            WAITABLE_LOCK(csOutbound);
                             nOutbound--;
 
                             // Connection slot(s) were removed, notify connection creator(s)
@@ -538,11 +546,23 @@ void ThreadSocketHandler2(void* parg)
                 if (pnode->GetRefCount() <= 0)
                 {
                     bool fDelete = false;
-                    TRY_CRITICAL_BLOCK(pnode->cs_vSend)
-                     TRY_CRITICAL_BLOCK(pnode->cs_vRecv)
-                      TRY_CRITICAL_BLOCK(pnode->cs_mapRequests)
-                       TRY_CRITICAL_BLOCK(pnode->cs_inventory)
-                        fDelete = true;
+                    {
+                        TRY_LOCK(pnode->cs_vSend, lockSend);
+                        if (lockSend)
+                        {
+                            TRY_LOCK(pnode->cs_vRecv, lockRecv);
+                            if (lockRecv)
+                            {
+                                TRY_LOCK(pnode->cs_mapRequests, lockReq);
+                                if (lockReq)
+                                {
+                                    TRY_LOCK(pnode->cs_inventory, lockInv);
+                                    if (lockInv)
+                                        fDelete = true;
+                                }
+                            }
+                        }
+                    }
                     if (fDelete)
                     {
                         vNodesDisconnected.remove(pnode);
@@ -576,8 +596,8 @@ void ThreadSocketHandler2(void* parg)
         if(hListenSocket != INVALID_SOCKET)
             FD_SET(hListenSocket, &fdsetRecv);
         hSocketMax = max(hSocketMax, hListenSocket);
-        CRITICAL_BLOCK(cs_vNodes)
         {
+            LOCK(cs_vNodes);
             BOOST_FOREACH(CNode* pnode, vNodes)
             {
                 if (pnode->hSocket == INVALID_SOCKET)
@@ -585,9 +605,11 @@ void ThreadSocketHandler2(void* parg)
                 FD_SET(pnode->hSocket, &fdsetRecv);
                 FD_SET(pnode->hSocket, &fdsetError);
                 hSocketMax = max(hSocketMax, pnode->hSocket);
-                TRY_CRITICAL_BLOCK(pnode->cs_vSend)
-                    if (!pnode->vSend.empty())
+                {
+                    TRY_LOCK(pnode->cs_vSend, lockSend);
+                    if (lockSend && !pnode->vSend.empty())
                         FD_SET(pnode->hSocket, &fdsetSend);
+                }
             }
         }
 
@@ -625,10 +647,12 @@ void ThreadSocketHandler2(void* parg)
             if (hSocket != INVALID_SOCKET)
                 addr = CAddress(sockaddr);
 
-            CRITICAL_BLOCK(cs_vNodes)
+            {
+                LOCK(cs_vNodes);
                 BOOST_FOREACH(CNode* pnode, vNodes)
-                if (pnode->fInbound)
-                    nInbound++;
+                    if (pnode->fInbound)
+                        nInbound++;
+            }
 
             if (hSocket == INVALID_SOCKET)
             {
@@ -637,9 +661,11 @@ void ThreadSocketHandler2(void* parg)
             }
             else if (nInbound >= GetArg("-maxconnections", 125) - MAX_OUTBOUND_CONNECTIONS)
             {
-                CRITICAL_BLOCK(cs_setservAddNodeAddresses)
+                {
+                    LOCK(cs_setservAddNodeAddresses);
                     if (!setservAddNodeAddresses.count(addr))
                         closesocket(hSocket);
+                }
             }
             else if (CNode::IsBanned(addr))
             {
@@ -651,8 +677,10 @@ void ThreadSocketHandler2(void* parg)
                 printf("accepted connection %s\n", addr.ToString().c_str());
                 CNode* pnode = new CNode(hSocket, addr, true);
                 pnode->AddRef();
-                CRITICAL_BLOCK(cs_vNodes)
+                {
+                    LOCK(cs_vNodes);
                     vNodes.push_back(pnode);
+                }
             }
         }
 
@@ -661,8 +689,8 @@ void ThreadSocketHandler2(void* parg)
         // Service each socket
         //
         vector<CNode*> vNodesCopy;
-        CRITICAL_BLOCK(cs_vNodes)
         {
+            LOCK(cs_vNodes);
             vNodesCopy = vNodes;
             BOOST_FOREACH(CNode* pnode, vNodesCopy)
                 pnode->AddRef();
@@ -679,7 +707,8 @@ void ThreadSocketHandler2(void* parg)
                 continue;
             if (FD_ISSET(pnode->hSocket, &fdsetRecv) || FD_ISSET(pnode->hSocket, &fdsetError))
             {
-                TRY_CRITICAL_BLOCK(pnode->cs_vRecv)
+                TRY_LOCK(pnode->cs_vRecv, lockRecv);
+                if (lockRecv)
                 {
                     CDataStream& vRecv = pnode->vRecv;
                     unsigned int nPos = vRecv.size();
@@ -728,7 +757,8 @@ void ThreadSocketHandler2(void* parg)
                 continue;
             if (FD_ISSET(pnode->hSocket, &fdsetSend))
             {
-                TRY_CRITICAL_BLOCK(pnode->cs_vSend)
+                TRY_LOCK(pnode->cs_vSend, lockSend);
+                if (lockSend)
                 {
                     CDataStream& vSend = pnode->vSend;
                     if (!vSend.empty())
@@ -782,8 +812,8 @@ void ThreadSocketHandler2(void* parg)
                 }
             }
         }
-        CRITICAL_BLOCK(cs_vNodes)
         {
+            LOCK(cs_vNodes);
             BOOST_FOREACH(CNode* pnode, vNodesCopy)
                 pnode->Release();
         }
@@ -1195,8 +1225,10 @@ void ThreadOpenConnections2(void* parg)
         // Limit outbound connections
         int nMaxOutbound = min(MAX_OUTBOUND_CONNECTIONS, (int)GetArg("-maxconnections", 125));
         vnThreadsRunning[THREAD_OPENCONNECTIONS]--;
-        WAITABLE_CRITICAL_BLOCK(csOutbound)
+        {
+            WAITABLE_LOCK(csOutbound);
             WAIT(condOutbound, fShutdown || nOutbound < nMaxOutbound);
+        }
         vnThreadsRunning[THREAD_OPENCONNECTIONS]++;
         if (fShutdown)
             return;
@@ -1233,9 +1265,11 @@ void ThreadOpenConnections2(void* parg)
         // Only connect to one address per a.b.?.? range.
         // Do this here so we don't have to critsect vNodes inside mapAddresses critsect.
         set<vector<unsigned char> > setConnected;
-        CRITICAL_BLOCK(cs_vNodes)
+        {
+            LOCK(cs_vNodes);
             BOOST_FOREACH(CNode* pnode, vNodes)
                 setConnected.insert(pnode->addr.GetGroup());
+        }
 
         int64 nANow = GetAdjustedTime();
 
@@ -1301,9 +1335,11 @@ void ThreadOpenAddedConnections2(void* parg)
         if(Lookup(strAddNode.c_str(), vservNode, GetDefaultPort(), fAllowDNS, 0))
         {
             vservAddressesToAdd.push_back(vservNode);
-            CRITICAL_BLOCK(cs_setservAddNodeAddresses)
+            {
+                LOCK(cs_setservAddNodeAddresses);
                 BOOST_FOREACH(CService& serv, vservNode)
                     setservAddNodeAddresses.insert(serv);
+            }
         }
     }
     loop
@@ -1311,7 +1347,8 @@ void ThreadOpenAddedConnections2(void* parg)
         vector<vector<CService> > vservConnectAddresses = vservAddressesToAdd;
         // Attempt to connect to each IP for each addnode entry until at least one is successful per addnode entry
         // (keeping in mind that addnode entries can have many IPs if fAllowDNS)
-        CRITICAL_BLOCK(cs_vNodes)
+        {
+            LOCK(cs_vNodes);
             BOOST_FOREACH(CNode* pnode, vNodes)
                 for (vector<vector<CService> >::iterator it = vservConnectAddresses.begin(); it != vservConnectAddresses.end(); it++)
                     BOOST_FOREACH(CService& addrNode, *(it))
@@ -1321,6 +1358,7 @@ void ThreadOpenAddedConnections2(void* parg)
                             it--;
                             break;
                         }
+        }
         BOOST_FOREACH(vector<CService>& vserv, vservConnectAddresses)
         {
             OpenNetworkConnection(CAddress(*(vserv.begin())));
@@ -1394,8 +1432,8 @@ void ThreadMessageHandler2(void* parg)
     while (!fShutdown)
     {
         vector<CNode*> vNodesCopy;
-        CRITICAL_BLOCK(cs_vNodes)
         {
+            LOCK(cs_vNodes);
             vNodesCopy = vNodes;
             BOOST_FOREACH(CNode* pnode, vNodesCopy)
                 pnode->AddRef();
@@ -1408,20 +1446,26 @@ void ThreadMessageHandler2(void* parg)
         BOOST_FOREACH(CNode* pnode, vNodesCopy)
         {
             // Receive messages
-            TRY_CRITICAL_BLOCK(pnode->cs_vRecv)
-                ProcessMessages(pnode);
+            {
+                TRY_LOCK(pnode->cs_vRecv, lockRecv);
+                if (lockRecv)
+                    ProcessMessages(pnode);
+            }
             if (fShutdown)
                 return;
 
             // Send messages
-            TRY_CRITICAL_BLOCK(pnode->cs_vSend)
-                SendMessages(pnode, pnode == pnodeTrickle);
+            {
+                TRY_LOCK(pnode->cs_vSend, lockSend);
+                if (lockSend)
+                    SendMessages(pnode, pnode == pnodeTrickle);
+            }
             if (fShutdown)
                 return;
         }
 
-        CRITICAL_BLOCK(cs_vNodes)
         {
+            LOCK(cs_vNodes);
             BOOST_FOREACH(CNode* pnode, vNodesCopy)
                 pnode->Release();
         }
diff --git a/src/net.h b/src/net.h
index cd707e7..3c84650 100644
--- a/src/net.h
+++ b/src/net.h
@@ -247,15 +247,19 @@ public:
 
     void AddInventoryKnown(const CInv& inv)
     {
-        CRITICAL_BLOCK(cs_inventory)
+        {
+            LOCK(cs_inventory);
             setInventoryKnown.insert(inv);
+        }
     }
 
     void PushInventory(const CInv& inv)
     {
-        CRITICAL_BLOCK(cs_inventory)
+        {
+            LOCK(cs_inventory);
             if (!setInventoryKnown.count(inv))
                 vInventoryToSend.push_back(inv);
+        }
     }
 
     void AskFor(const CInv& inv)
@@ -519,8 +523,10 @@ public:
         uint256 hashReply;
         RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
 
-        CRITICAL_BLOCK(cs_mapRequests)
+        {
+            LOCK(cs_mapRequests);
             mapRequests[hashReply] = CRequestTracker(fn, param1);
+        }
 
         PushMessage(pszCommand, hashReply);
     }
@@ -532,8 +538,10 @@ public:
         uint256 hashReply;
         RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
 
-        CRITICAL_BLOCK(cs_mapRequests)
+        {
+            LOCK(cs_mapRequests);
             mapRequests[hashReply] = CRequestTracker(fn, param1);
+        }
 
         PushMessage(pszCommand, hashReply, a1);
     }
@@ -545,8 +553,10 @@ public:
         uint256 hashReply;
         RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply));
 
-        CRITICAL_BLOCK(cs_mapRequests)
+        {
+            LOCK(cs_mapRequests);
             mapRequests[hashReply] = CRequestTracker(fn, param1);
+        }
 
         PushMessage(pszCommand, hashReply, a1, a2);
     }
@@ -592,9 +602,11 @@ public:
 inline void RelayInventory(const CInv& inv)
 {
     // Put on lists to offer to the other nodes
-    CRITICAL_BLOCK(cs_vNodes)
+    {
+        LOCK(cs_vNodes);
         BOOST_FOREACH(CNode* pnode, vNodes)
             pnode->PushInventory(inv);
+    }
 }
 
 template<typename T>
@@ -609,8 +621,8 @@ void RelayMessage(const CInv& inv, const T& a)
 template<>
 inline void RelayMessage<>(const CInv& inv, const CDataStream& ss)
 {
-    CRITICAL_BLOCK(cs_mapRelay)
     {
+        LOCK(cs_mapRelay);
         // Expire old relay messages
         while (!vRelayExpiration.empty() && vRelayExpiration.front().first < GetTime())
         {
diff --git a/src/qt/addresstablemodel.cpp b/src/qt/addresstablemodel.cpp
index 198a857..05f3a81 100644
--- a/src/qt/addresstablemodel.cpp
+++ b/src/qt/addresstablemodel.cpp
@@ -39,8 +39,8 @@ struct AddressTablePriv
     {
         cachedAddressTable.clear();
 
-        CRITICAL_BLOCK(wallet->cs_wallet)
         {
+            LOCK(wallet->cs_wallet);
             BOOST_FOREACH(const PAIRTYPE(CBitcoinAddress, std::string)& item, wallet->mapAddressBook)
             {
                 const CBitcoinAddress& address = item.first;
@@ -169,8 +169,8 @@ bool AddressTableModel::setData(const QModelIndex & index, const QVariant & valu
             // Double-check that we're not overwriting a receiving address
             if(rec->type == AddressTableEntry::Sending)
             {
-                CRITICAL_BLOCK(wallet->cs_wallet)
                 {
+                    LOCK(wallet->cs_wallet);
                     // Remove old entry
                     wallet->DelAddressBookName(rec->address.toStdString());
                     // Add new entry with new address
@@ -254,8 +254,8 @@ QString AddressTableModel::addRow(const QString &type, const QString &label, con
             return QString();
         }
         // Check for duplicate addresses
-        CRITICAL_BLOCK(wallet->cs_wallet)
         {
+            LOCK(wallet->cs_wallet);
             if(wallet->mapAddressBook.count(strAddress))
             {
                 editStatus = DUPLICATE_ADDRESS;
@@ -286,8 +286,10 @@ QString AddressTableModel::addRow(const QString &type, const QString &label, con
         return QString();
     }
     // Add entry
-    CRITICAL_BLOCK(wallet->cs_wallet)
+    {
+        LOCK(wallet->cs_wallet);
         wallet->SetAddressBookName(strAddress, strLabel);
+    }
     return QString::fromStdString(strAddress);
 }
 
@@ -301,8 +303,8 @@ bool AddressTableModel::removeRows(int row, int count, const QModelIndex & paren
         // Also refuse to remove receiving addresses.
         return false;
     }
-    CRITICAL_BLOCK(wallet->cs_wallet)
     {
+        LOCK(wallet->cs_wallet);
         wallet->DelAddressBookName(rec->address.toStdString());
     }
     return true;
@@ -312,8 +314,8 @@ bool AddressTableModel::removeRows(int row, int count, const QModelIndex & paren
  */
 QString AddressTableModel::labelForAddress(const QString &address) const
 {
-    CRITICAL_BLOCK(wallet->cs_wallet)
     {
+        LOCK(wallet->cs_wallet);
         CBitcoinAddress address_parsed(address.toStdString());
         std::map<CBitcoinAddress, std::string>::iterator mi = wallet->mapAddressBook.find(address_parsed);
         if (mi != wallet->mapAddressBook.end())
diff --git a/src/qt/transactiondesc.cpp b/src/qt/transactiondesc.cpp
index c32a006..dd7dd61 100644
--- a/src/qt/transactiondesc.cpp
+++ b/src/qt/transactiondesc.cpp
@@ -34,8 +34,9 @@ QString TransactionDesc::FormatTxStatus(const CWalletTx& wtx)
 QString TransactionDesc::toHTML(CWallet *wallet, CWalletTx &wtx)
 {
     QString strHTML;
-    CRITICAL_BLOCK(wallet->cs_wallet)
+
     {
+        LOCK(wallet->cs_wallet);
         strHTML.reserve(4000);
         strHTML += "<html><font face='verdana, arial, helvetica, sans-serif'>";
 
@@ -243,8 +244,9 @@ QString TransactionDesc::toHTML(CWallet *wallet, CWalletTx &wtx)
 
             strHTML += "<br><b>Inputs:</b>";
             strHTML += "<ul>";
-            CRITICAL_BLOCK(wallet->cs_wallet)
+
             {
+                LOCK(wallet->cs_wallet);
                 BOOST_FOREACH(const CTxIn& txin, wtx.vin)
                 {
                     COutPoint prevout = txin.prevout;
diff --git a/src/qt/transactiontablemodel.cpp b/src/qt/transactiontablemodel.cpp
index 480d4ac..aa11df9 100644
--- a/src/qt/transactiontablemodel.cpp
+++ b/src/qt/transactiontablemodel.cpp
@@ -69,8 +69,8 @@ struct TransactionTablePriv
         qDebug() << "refreshWallet";
 #endif
         cachedWallet.clear();
-        CRITICAL_BLOCK(wallet->cs_wallet)
         {
+            LOCK(wallet->cs_wallet);
             for(std::map<uint256, CWalletTx>::iterator it = wallet->mapWallet.begin(); it != wallet->mapWallet.end(); ++it)
             {
                 cachedWallet.append(TransactionRecord::decomposeTransaction(wallet, it->second));
@@ -95,8 +95,8 @@ struct TransactionTablePriv
         QList<uint256> updated_sorted = updated;
         qSort(updated_sorted);
 
-        CRITICAL_BLOCK(wallet->cs_wallet)
         {
+            LOCK(wallet->cs_wallet);
             for(int update_idx = updated_sorted.size()-1; update_idx >= 0; --update_idx)
             {
                 const uint256 &hash = updated_sorted.at(update_idx);
@@ -171,8 +171,8 @@ struct TransactionTablePriv
             // simply re-use the cached status.
             if(rec->statusUpdateNeeded())
             {
-                CRITICAL_BLOCK(wallet->cs_wallet)
                 {
+                    LOCK(wallet->cs_wallet);
                     std::map<uint256, CWalletTx>::iterator mi = wallet->mapWallet.find(rec->hash);
 
                     if(mi != wallet->mapWallet.end())
@@ -191,8 +191,8 @@ struct TransactionTablePriv
 
     QString describe(TransactionRecord *rec)
     {
-        CRITICAL_BLOCK(wallet->cs_wallet)
         {
+            LOCK(wallet->cs_wallet);
             std::map<uint256, CWalletTx>::iterator mi = wallet->mapWallet.find(rec->hash);
             if(mi != wallet->mapWallet.end())
             {
@@ -229,9 +229,9 @@ void TransactionTableModel::update()
     QList<uint256> updated;
 
     // Check if there are changes to wallet map
-    TRY_CRITICAL_BLOCK(wallet->cs_wallet)
     {
-        if(!wallet->vWalletUpdated.empty())
+        TRY_LOCK(wallet->cs_wallet, lockWallet);
+        if (lockWallet && !wallet->vWalletUpdated.empty())
         {
             BOOST_FOREACH(uint256 hash, wallet->vWalletUpdated)
             {
diff --git a/src/qt/walletmodel.cpp b/src/qt/walletmodel.cpp
index 6cc0237..9c28a8a 100644
--- a/src/qt/walletmodel.cpp
+++ b/src/qt/walletmodel.cpp
@@ -32,8 +32,8 @@ qint64 WalletModel::getUnconfirmedBalance() const
 int WalletModel::getNumTransactions() const
 {
     int numTransactions = 0;
-    CRITICAL_BLOCK(wallet->cs_wallet)
     {
+        LOCK(wallet->cs_wallet);
         numTransactions = wallet->mapWallet.size();
     }
     return numTransactions;
@@ -115,9 +115,9 @@ WalletModel::SendCoinsReturn WalletModel::sendCoins(const QList<SendCoinsRecipie
         return SendCoinsReturn(AmountWithFeeExceedsBalance, nTransactionFee);
     }
 
-    CRITICAL_BLOCK(cs_main)
-    CRITICAL_BLOCK(wallet->cs_wallet)
     {
+        LOCK2(cs_main, wallet->cs_wallet);
+
         // Sendmany
         std::vector<std::pair<CScript, int64> > vecSend;
         foreach(const SendCoinsRecipient &rcp, recipients)
@@ -155,8 +155,8 @@ WalletModel::SendCoinsReturn WalletModel::sendCoins(const QList<SendCoinsRecipie
     foreach(const SendCoinsRecipient &rcp, recipients)
     {
         std::string strAddress = rcp.address.toStdString();
-        CRITICAL_BLOCK(wallet->cs_wallet)
         {
+            LOCK(wallet->cs_wallet);
             if (!wallet->mapAddressBook.count(strAddress))
                 wallet->SetAddressBookName(strAddress, rcp.label.toStdString());
         }
@@ -227,8 +227,8 @@ bool WalletModel::setWalletLocked(bool locked, const SecureString &passPhrase)
 bool WalletModel::changePassphrase(const SecureString &oldPass, const SecureString &newPass)
 {
     bool retval;
-    CRITICAL_BLOCK(wallet->cs_wallet)
     {
+        LOCK(wallet->cs_wallet);
         wallet->Lock(); // Make sure wallet is locked before attempting pass change
         retval = wallet->ChangeWalletPassphrase(oldPass, newPass);
     }
diff --git a/src/rpcdump.cpp b/src/rpcdump.cpp
index 8180aad..5bb4789 100644
--- a/src/rpcdump.cpp
+++ b/src/rpcdump.cpp
@@ -60,9 +60,9 @@ Value importprivkey(const Array& params, bool fHelp)
     key.SetSecret(secret, fCompressed);
     CBitcoinAddress vchAddress = CBitcoinAddress(key.GetPubKey());
 
-    CRITICAL_BLOCK(cs_main)
-    CRITICAL_BLOCK(pwalletMain->cs_wallet)
     {
+        LOCK2(cs_main, pwalletMain->cs_wallet);
+
         pwalletMain->MarkDirty();
         pwalletMain->SetAddressBookName(vchAddress, strLabel);
 
diff --git a/src/test/util_tests.cpp b/src/test/util_tests.cpp
index 94c0c77..db31f49 100644
--- a/src/test/util_tests.cpp
+++ b/src/test/util_tests.cpp
@@ -15,14 +15,15 @@ BOOST_AUTO_TEST_CASE(util_criticalsection)
     CCriticalSection cs;
 
     do {
-        CRITICAL_BLOCK(cs)
-            break;
+        LOCK(cs);
+        break;
 
         BOOST_ERROR("break was swallowed!");
     } while(0);
 
     do {
-        TRY_CRITICAL_BLOCK(cs)
+        TRY_LOCK(cs, lockTest);
+        if (lockTest)
             break;
 
         BOOST_ERROR("break was swallowed!");
diff --git a/src/util.cpp b/src/util.cpp
index d55e7ae..fd4847b 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -195,8 +195,8 @@ inline int OutputDebugStringF(const char* pszFormat, ...)
         static CCriticalSection cs_OutputDebugStringF;
 
         // accumulate a line at a time
-        CRITICAL_BLOCK(cs_OutputDebugStringF)
         {
+            LOCK(cs_OutputDebugStringF);
             static char pszBuffer[50000];
             static char* pend;
             if (pend == NULL)
diff --git a/src/util.h b/src/util.h
index 635790b..7027e62 100644
--- a/src/util.h
+++ b/src/util.h
@@ -282,13 +282,10 @@ typedef boost::interprocess::interprocess_condition CConditionVariable;
 #define NOTIFY_ALL(name) \
    do { (name).notify_all(); } while(0)
 
-#define CRITICAL_BLOCK(cs)     \
-    for (bool fcriticalblockonce=true; fcriticalblockonce; assert(("break caught by CRITICAL_BLOCK!" && !fcriticalblockonce)), fcriticalblockonce=false) \
-        for (CCriticalBlock criticalblock(cs, #cs, __FILE__, __LINE__); fcriticalblockonce; fcriticalblockonce=false)
-
-#define WAITABLE_CRITICAL_BLOCK(cs)     \
-    for (bool fcriticalblockonce=true; fcriticalblockonce; assert(("break caught by WAITABLE_CRITICAL_BLOCK!" && !fcriticalblockonce)), fcriticalblockonce=false) \
-        for (CWaitableCriticalBlock waitablecriticalblock(cs, #cs, __FILE__, __LINE__); fcriticalblockonce; fcriticalblockonce=false)
+#define LOCK(cs) CCriticalBlock criticalblock(cs, #cs, __FILE__, __LINE__)
+#define LOCK2(cs1,cs2) CCriticalBlock criticalblock1(cs1, #cs1, __FILE__, __LINE__),criticalblock2(cs2, #cs2, __FILE__, __LINE__)
+#define TRY_LOCK(cs,name) CCriticalBlock name(cs, #cs, __FILE__, __LINE__, true)
+#define WAITABLE_LOCK(cs) CWaitableCriticalBlock waitablecriticalblock(cs, #cs, __FILE__, __LINE__)
 
 #define ENTER_CRITICAL_SECTION(cs) \
     { \
@@ -302,10 +299,6 @@ typedef boost::interprocess::interprocess_condition CConditionVariable;
         LeaveCritical(); \
     }
 
-#define TRY_CRITICAL_BLOCK(cs)     \
-    for (bool fcriticalblockonce=true; fcriticalblockonce; assert(("break caught by TRY_CRITICAL_BLOCK!" && !fcriticalblockonce)), fcriticalblockonce=false) \
-        for (CCriticalBlock criticalblock(cs, #cs, __FILE__, __LINE__, true); fcriticalblockonce && (fcriticalblockonce = criticalblock); fcriticalblockonce=false)
-
 
 // This is exactly like std::string, but with a custom allocator.
 // (secure_allocator<> is defined in serialize.h)
diff --git a/src/wallet.cpp b/src/wallet.cpp
index e444e5f..97ed6aa 100644
--- a/src/wallet.cpp
+++ b/src/wallet.cpp
@@ -49,8 +49,8 @@ bool CWallet::AddCryptedKey(const vector<unsigned char> &vchPubKey, const vector
         return false;
     if (!fFileBacked)
         return true;
-    CRITICAL_BLOCK(cs_wallet)
     {
+        LOCK(cs_wallet);
         if (pwalletdbEncryption)
             return pwalletdbEncryption->WriteCryptedKey(vchPubKey, vchCryptedSecret);
         else
@@ -76,7 +76,8 @@ bool CWallet::Unlock(const SecureString& strWalletPassphrase)
     CCrypter crypter;
     CKeyingMaterial vMasterKey;
 
-    CRITICAL_BLOCK(cs_wallet)
+    {
+        LOCK(cs_wallet);
         BOOST_FOREACH(const MasterKeyMap::value_type& pMasterKey, mapMasterKeys)
         {
             if(!crypter.SetKeyFromPassphrase(strWalletPassphrase, pMasterKey.second.vchSalt, pMasterKey.second.nDeriveIterations, pMasterKey.second.nDerivationMethod))
@@ -86,6 +87,7 @@ bool CWallet::Unlock(const SecureString& strWalletPassphrase)
             if (CCryptoKeyStore::Unlock(vMasterKey))
                 return true;
         }
+    }
     return false;
 }
 
@@ -93,8 +95,8 @@ bool CWallet::ChangeWalletPassphrase(const SecureString& strOldWalletPassphrase,
 {
     bool fWasLocked = IsLocked();
 
-    CRITICAL_BLOCK(cs_wallet)
     {
+        LOCK(cs_wallet);
         Lock();
 
         CCrypter crypter;
@@ -228,8 +230,8 @@ bool CWallet::EncryptWallet(const SecureString& strWalletPassphrase)
     if (!crypter.Encrypt(vMasterKey, kMasterKey.vchCryptedKey))
         return false;
 
-    CRITICAL_BLOCK(cs_wallet)
     {
+        LOCK(cs_wallet);
         mapMasterKeys[++nMasterKeyMaxID] = kMasterKey;
         if (fFileBacked)
         {
@@ -275,8 +277,8 @@ void CWallet::WalletUpdateSpent(const CTransaction &tx)
     // Anytime a signature is successfully verified, it's proof the outpoint is spent.
     // Update the wallet spent flag if it doesn't know due to wallet.dat being
     // restored from backup or the user making copies of wallet.dat.
-    CRITICAL_BLOCK(cs_wallet)
     {
+        LOCK(cs_wallet);
         BOOST_FOREACH(const CTxIn& txin, tx.vin)
         {
             map<uint256, CWalletTx>::iterator mi = mapWallet.find(txin.prevout.hash);
@@ -297,8 +299,8 @@ void CWallet::WalletUpdateSpent(const CTransaction &tx)
 
 void CWallet::MarkDirty()
 {
-    CRITICAL_BLOCK(cs_wallet)
     {
+        LOCK(cs_wallet);
         BOOST_FOREACH(PAIRTYPE(const uint256, CWalletTx)& item, mapWallet)
             item.second.MarkDirty();
     }
@@ -307,8 +309,8 @@ void CWallet::MarkDirty()
 bool CWallet::AddToWallet(const CWalletTx& wtxIn)
 {
     uint256 hash = wtxIn.GetHash();
-    CRITICAL_BLOCK(cs_wallet)
     {
+        LOCK(cs_wallet);
         // Inserts only if not already there, returns tx inserted or tx found
         pair<map<uint256, CWalletTx>::iterator, bool> ret = mapWallet.insert(make_pair(hash, wtxIn));
         CWalletTx& wtx = (*ret.first).second;
@@ -382,8 +384,8 @@ bool CWallet::AddToWallet(const CWalletTx& wtxIn)
 bool CWallet::AddToWalletIfInvolvingMe(const CTransaction& tx, const CBlock* pblock, bool fUpdate, bool fFindBlock)
 {
     uint256 hash = tx.GetHash();
-    CRITICAL_BLOCK(cs_wallet)
     {
+        LOCK(cs_wallet);
         bool fExisted = mapWallet.count(hash);
         if (fExisted && !fUpdate) return false;
         if (fExisted || IsMine(tx) || IsFromMe(tx))
@@ -404,8 +406,8 @@ bool CWallet::EraseFromWallet(uint256 hash)
 {
     if (!fFileBacked)
         return false;
-    CRITICAL_BLOCK(cs_wallet)
     {
+        LOCK(cs_wallet);
         if (mapWallet.erase(hash))
             CWalletDB(strWalletFile).EraseTx(hash);
     }
@@ -415,8 +417,8 @@ bool CWallet::EraseFromWallet(uint256 hash)
 
 bool CWallet::IsMine(const CTxIn &txin) const
 {
-    CRITICAL_BLOCK(cs_wallet)
     {
+        LOCK(cs_wallet);
         map<uint256, CWalletTx>::const_iterator mi = mapWallet.find(txin.prevout.hash);
         if (mi != mapWallet.end())
         {
@@ -431,8 +433,8 @@ bool CWallet::IsMine(const CTxIn &txin) const
 
 int64 CWallet::GetDebit(const CTxIn &txin) const
 {
-    CRITICAL_BLOCK(cs_wallet)
     {
+        LOCK(cs_wallet);
         map<uint256, CWalletTx>::const_iterator mi = mapWallet.find(txin.prevout.hash);
         if (mi != mapWallet.end())
         {
@@ -457,9 +459,11 @@ bool CWallet::IsChange(const CTxOut& txout) const
     // 'the change' will need to be implemented (maybe extend CWalletTx to remember
     // which output, if any, was change).
     if (ExtractAddress(txout.scriptPubKey, address) && HaveKey(address))
-        CRITICAL_BLOCK(cs_wallet)
-            if (!mapAddressBook.count(address))
-                return true;
+    {
+        LOCK(cs_wallet);
+        if (!mapAddressBook.count(address))
+            return true;
+    }
     return false;
 }
 
@@ -472,8 +476,8 @@ int CWalletTx::GetRequestCount() const
 {
     // Returns -1 if it wasn't being tracked
     int nRequests = -1;
-    CRITICAL_BLOCK(pwallet->cs_wallet)
     {
+        LOCK(pwallet->cs_wallet);
         if (IsCoinBase())
         {
             // Generated block
@@ -577,8 +581,8 @@ void CWalletTx::GetAccountAmounts(const string& strAccount, int64& nGenerated, i
             nSent += s.second;
         nFee = allFee;
     }
-    CRITICAL_BLOCK(pwallet->cs_wallet)
     {
+        LOCK(pwallet->cs_wallet);
         BOOST_FOREACH(const PAIRTYPE(CBitcoinAddress,int64)& r, listReceived)
         {
             if (pwallet->mapAddressBook.count(r.first))
@@ -607,8 +611,8 @@ void CWalletTx::AddSupportingTransactions(CTxDB& txdb)
             vWorkQueue.push_back(txin.prevout.hash);
 
         // This critsect is OK because txdb is already open
-        CRITICAL_BLOCK(pwallet->cs_wallet)
         {
+            LOCK(pwallet->cs_wallet);
             map<uint256, const CMerkleTx*> mapWalletPrev;
             set<uint256> setAlreadyDone;
             for (int i = 0; i < vWorkQueue.size(); i++)
@@ -666,8 +670,8 @@ int CWallet::ScanForWalletTransactions(CBlockIndex* pindexStart, bool fUpdate)
     int ret = 0;
 
     CBlockIndex* pindex = pindexStart;
-    CRITICAL_BLOCK(cs_wallet)
     {
+        LOCK(cs_wallet);
         while (pindex)
         {
             CBlock block;
@@ -696,8 +700,9 @@ void CWallet::ReacceptWalletTransactions()
 {
     CTxDB txdb("r");
     bool fRepeat = true;
-    while (fRepeat) CRITICAL_BLOCK(cs_wallet)
+    while (fRepeat)
     {
+        LOCK(cs_wallet);
         fRepeat = false;
         vector<CDiskTxPos> vMissingTx;
         BOOST_FOREACH(PAIRTYPE(const uint256, CWalletTx)& item, mapWallet)
@@ -799,8 +804,8 @@ void CWallet::ResendWalletTransactions()
     // Rebroadcast any of our txes that aren't in a block yet
     printf("ResendWalletTransactions()\n");
     CTxDB txdb("r");
-    CRITICAL_BLOCK(cs_wallet)
     {
+        LOCK(cs_wallet);
         // Sort them in chronological order
         multimap<unsigned int, CWalletTx*> mapSorted;
         BOOST_FOREACH(PAIRTYPE(const uint256, CWalletTx)& item, mapWallet)
@@ -833,8 +838,8 @@ void CWallet::ResendWalletTransactions()
 int64 CWallet::GetBalance() const
 {
     int64 nTotal = 0;
-    CRITICAL_BLOCK(cs_wallet)
     {
+        LOCK(cs_wallet);
         for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
         {
             const CWalletTx* pcoin = &(*it).second;
@@ -850,8 +855,8 @@ int64 CWallet::GetBalance() const
 int64 CWallet::GetUnconfirmedBalance() const
 {
     int64 nTotal = 0;
-    CRITICAL_BLOCK(cs_wallet)
     {
+        LOCK(cs_wallet);
         for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
         {
             const CWalletTx* pcoin = &(*it).second;
@@ -875,8 +880,8 @@ bool CWallet::SelectCoinsMinConf(int64 nTargetValue, int nConfMine, int nConfThe
     vector<pair<int64, pair<const CWalletTx*,unsigned int> > > vValue;
     int64 nTotalLower = 0;
 
-    CRITICAL_BLOCK(cs_wallet)
     {
+       LOCK(cs_wallet);
        vector<const CWalletTx*> vCoins;
        vCoins.reserve(mapWallet.size());
        for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
@@ -1032,9 +1037,8 @@ bool CWallet::CreateTransaction(const vector<pair<CScript, int64> >& vecSend, CW
 
     wtxNew.BindWallet(this);
 
-    CRITICAL_BLOCK(cs_main)
-    CRITICAL_BLOCK(cs_wallet)
     {
+        LOCK2(cs_main, cs_wallet);
         // txdb must be opened before the mapWallet lock
         CTxDB txdb("r");
         {
@@ -1146,9 +1150,8 @@ bool CWallet::CreateTransaction(CScript scriptPubKey, int64 nValue, CWalletTx& w
 // Call after CreateTransaction unless you want to abort
 bool CWallet::CommitTransaction(CWalletTx& wtxNew, CReserveKey& reservekey)
 {
-    CRITICAL_BLOCK(cs_main)
-    CRITICAL_BLOCK(cs_wallet)
     {
+        LOCK2(cs_main, cs_wallet);
         printf("CommitTransaction:\n%s", wtxNew.ToString().c_str());
         {
             // This is only to keep the database open to defeat the auto-flush for the
@@ -1297,8 +1300,8 @@ bool CWallet::DelAddressBookName(const CBitcoinAddress& address)
 
 void CWallet::PrintWallet(const CBlock& block)
 {
-    CRITICAL_BLOCK(cs_wallet)
     {
+        LOCK(cs_wallet);
         if (mapWallet.count(block.vtx[0].GetHash()))
         {
             CWalletTx& wtx = mapWallet[block.vtx[0].GetHash()];
@@ -1310,8 +1313,8 @@ void CWallet::PrintWallet(const CBlock& block)
 
 bool CWallet::GetTransaction(const uint256 &hashTx, CWalletTx& wtx)
 {
-    CRITICAL_BLOCK(cs_wallet)
     {
+        LOCK(cs_wallet);
         map<uint256, CWalletTx>::iterator mi = mapWallet.find(hashTx);
         if (mi != mapWallet.end())
         {
@@ -1347,8 +1350,8 @@ bool GetWalletFile(CWallet* pwallet, string &strWalletFileOut)
 //
 bool CWallet::NewKeyPool()
 {
-    CRITICAL_BLOCK(cs_wallet)
     {
+        LOCK(cs_wallet);
         CWalletDB walletdb(strWalletFile);
         BOOST_FOREACH(int64 nIndex, setKeyPool)
             walletdb.ErasePool(nIndex);
@@ -1371,8 +1374,9 @@ bool CWallet::NewKeyPool()
 
 bool CWallet::TopUpKeyPool()
 {
-    CRITICAL_BLOCK(cs_wallet)
     {
+        LOCK(cs_wallet);
+
         if (IsLocked())
             return false;
 
@@ -1398,8 +1402,9 @@ void CWallet::ReserveKeyFromKeyPool(int64& nIndex, CKeyPool& keypool)
 {
     nIndex = -1;
     keypool.vchPubKey.clear();
-    CRITICAL_BLOCK(cs_wallet)
     {
+        LOCK(cs_wallet);
+
         if (!IsLocked())
             TopUpKeyPool();
 
@@ -1422,9 +1427,8 @@ void CWallet::ReserveKeyFromKeyPool(int64& nIndex, CKeyPool& keypool)
 
 int64 CWallet::AddReserveKey(const CKeyPool& keypool)
 {
-    CRITICAL_BLOCK(cs_main)
-    CRITICAL_BLOCK(cs_wallet)
     {
+        LOCK2(cs_main, cs_wallet);
         CWalletDB walletdb(strWalletFile);
 
         int64 nIndex = 1 + *(--setKeyPool.end());
@@ -1450,8 +1454,10 @@ void CWallet::KeepKey(int64 nIndex)
 void CWallet::ReturnKey(int64 nIndex)
 {
     // Return to key pool
-    CRITICAL_BLOCK(cs_wallet)
+    {
+        LOCK(cs_wallet);
         setKeyPool.insert(nIndex);
+    }
     printf("keypool return %"PRI64d"\n", nIndex);
 }
 
@@ -1459,8 +1465,8 @@ bool CWallet::GetKeyFromPool(vector<unsigned char>& result, bool fAllowReuse)
 {
     int64 nIndex = 0;
     CKeyPool keypool;
-    CRITICAL_BLOCK(cs_wallet)
     {
+        LOCK(cs_wallet);
         ReserveKeyFromKeyPool(nIndex, keypool);
         if (nIndex == -1)
         {
@@ -1530,8 +1536,7 @@ void CWallet::GetAllReserveAddresses(set<CBitcoinAddress>& setAddress)
 
     CWalletDB walletdb(strWalletFile);
 
-    CRITICAL_BLOCK(cs_main)
-    CRITICAL_BLOCK(cs_wallet)
+    LOCK2(cs_main, cs_wallet);
     BOOST_FOREACH(const int64& id, setKeyPool)
     {
         CKeyPool keypool;
diff --git a/src/wallet.h b/src/wallet.h
index e1065cf..f864370 100644
--- a/src/wallet.h
+++ b/src/wallet.h
@@ -211,16 +211,18 @@ public:
 
     void UpdatedTransaction(const uint256 &hashTx)
     {
-        CRITICAL_BLOCK(cs_wallet)
+        {
+            LOCK(cs_wallet);
             vWalletUpdated.push_back(hashTx);
+        }
     }
 
     void PrintWallet(const CBlock& block);
 
     void Inventory(const uint256 &hash)
     {
-        CRITICAL_BLOCK(cs_wallet)
         {
+            LOCK(cs_wallet);
             std::map<uint256, int>::iterator mi = mapRequestCount.find(hash);
             if (mi != mapRequestCount.end())
                 (*mi).second++;