22 files changed, 434 insertions, 94 deletions
diff --git a/src/bignum.h b/src/bignum.h
index 96b1b2e6ae..ad98613f5f 100644
--- a/src/bignum.h
+++ b/src/bignum.h
@@ -262,28 +262,68 @@ public:
         return vch;
     }
 
+    // The "compact" format is a representation of a whole
+    // number N using an unsigned 32bit number similar to a
+    // floating point format.
+    // The most significant 8 bits are the unsigned exponent of base 256.
+    // This exponent can be thought of as "number of bytes of N".
+    // The lower 23 bits are the mantissa.
+    // Bit number 24 (0x800000) represents the sign of N.
+    // N = (-1^sign) * mantissa * 256^(exponent-3)
+    //
+    // Satoshi's original implementation used BN_bn2mpi() and BN_mpi2bn().
+    // MPI uses the most significant bit of the first byte as sign.
+    // Thus 0x1234560000 is compact (0x05123456)
+    // and  0xc0de000000 is compact (0x0600c0de)
+    // (0x05c0de00) would be -0x40de000000
+    //
+    // Bitcoin only uses this "compact" format for encoding difficulty
+    // targets, which are unsigned 256bit quantities.  Thus, all the
+    // complexities of the sign bit and using base 256 are probably an
+    // implementation accident.
+    //
+    // This implementation directly uses shifts instead of going
+    // through an intermediate MPI representation.
     CBigNum& SetCompact(unsigned int nCompact)
     {
         unsigned int nSize = nCompact >> 24;
-        std::vector<unsigned char> vch(4 + nSize);
-        vch[3] = nSize;
-        if (nSize >= 1) vch[4] = (nCompact >> 16) & 0xff;
-        if (nSize >= 2) vch[5] = (nCompact >> 8) & 0xff;
-        if (nSize >= 3) vch[6] = (nCompact >> 0) & 0xff;
-        BN_mpi2bn(&vch[0], vch.size(), this);
+        bool fNegative     =(nCompact & 0x00800000) != 0;
+        unsigned int nWord = nCompact & 0x007fffff;
+        if (nSize <= 3)
+        {
+            nWord >>= 8*(3-nSize);
+            BN_set_word(this, nWord);
+        }
+        else
+        {
+            BN_set_word(this, nWord);
+            BN_lshift(this, this, 8*(nSize-3));
+        }
+        BN_set_negative(this, fNegative);
         return *this;
     }
 
     unsigned int GetCompact() const
     {
-        unsigned int nSize = BN_bn2mpi(this, NULL);
-        std::vector<unsigned char> vch(nSize);
-        nSize -= 4;
-        BN_bn2mpi(this, &vch[0]);
-        unsigned int nCompact = nSize << 24;
-        if (nSize >= 1) nCompact |= (vch[4] << 16);
-        if (nSize >= 2) nCompact |= (vch[5] << 8);
-        if (nSize >= 3) nCompact |= (vch[6] << 0);
+        unsigned int nSize = BN_num_bytes(this);
+        unsigned int nCompact = 0;
+        if (nSize <= 3)
+            nCompact = BN_get_word(this) << 8*(3-nSize);
+        else
+        {
+            CBigNum bn;
+            BN_rshift(&bn, this, 8*(nSize-3));
+            nCompact = BN_get_word(&bn);
+        }
+        // The 0x00800000 bit denotes the sign.
+        // Thus, if it is already set, divide the mantissa by 256 and increase the exponent.
+        if (nCompact & 0x00800000)
+        {
+            nCompact >>= 8;
+            nSize++;
+        }
+        nCompact |= nSize << 24;
+        nCompact |= (BN_is_negative(this) ? 0x00800000 : 0);
         return nCompact;
     }
 
diff --git a/src/bitcoinrpc.cpp b/src/bitcoinrpc.cpp
index 481ceb9f40..bfb696da3d 100644
--- a/src/bitcoinrpc.cpp
+++ b/src/bitcoinrpc.cpp
@@ -254,6 +254,8 @@ static const CRPCCommand vRPCCommands[] =
     { "sendrawtransaction",     &sendrawtransaction,     false,  false },
     { "gettxoutsetinfo",        &gettxoutsetinfo,        true,   false },
     { "gettxout",               &gettxout,               true,   false },
+    { "lockunspent",            &lockunspent,            false,  false },
+    { "listlockunspent",        &listlockunspent,        false,  false },
 };
 
 CRPCTable::CRPCTable()
@@ -1215,6 +1217,8 @@ Array RPCConvertValues(const std::string &strMethod, const std::vector<std::stri
     if (strMethod == "signrawtransaction"     && n > 2) ConvertTo<Array>(params[2], true);
     if (strMethod == "gettxout"               && n > 1) ConvertTo<boost::int64_t>(params[1]);
     if (strMethod == "gettxout"               && n > 2) ConvertTo<bool>(params[2]);
+    if (strMethod == "lockunspent"            && n > 0) ConvertTo<bool>(params[0]);
+    if (strMethod == "lockunspent"            && n > 1) ConvertTo<Array>(params[1]);
 
     return params;
 }
diff --git a/src/bitcoinrpc.h b/src/bitcoinrpc.h
index dc4dc303a8..44050ae1bb 100644
--- a/src/bitcoinrpc.h
+++ b/src/bitcoinrpc.h
@@ -177,6 +177,8 @@ extern json_spirit::Value getinfo(const json_spirit::Array& params, bool fHelp);
 
 extern json_spirit::Value getrawtransaction(const json_spirit::Array& params, bool fHelp); // in rcprawtransaction.cpp
 extern json_spirit::Value listunspent(const json_spirit::Array& params, bool fHelp);
+extern json_spirit::Value lockunspent(const json_spirit::Array& params, bool fHelp);
+extern json_spirit::Value listlockunspent(const json_spirit::Array& params, bool fHelp);
 extern json_spirit::Value createrawtransaction(const json_spirit::Array& params, bool fHelp);
 extern json_spirit::Value decoderawtransaction(const json_spirit::Array& params, bool fHelp);
 extern json_spirit::Value signrawtransaction(const json_spirit::Array& params, bool fHelp);
diff --git a/src/checkpoints.cpp b/src/checkpoints.cpp
index 8208854962..279003072e 100644
--- a/src/checkpoints.cpp
+++ b/src/checkpoints.cpp
@@ -39,6 +39,9 @@ namespace Checkpoints
 
     bool CheckBlock(int nHeight, const uint256& hash)
     {
+        if (!GetBoolArg("-checkpoints", true))
+            return true;
+
         MapCheckpoints& checkpoints = (fTestNet ? mapCheckpointsTestnet : mapCheckpoints);
 
         MapCheckpoints::const_iterator i = checkpoints.find(nHeight);
@@ -48,6 +51,9 @@ namespace Checkpoints
 
     int GetTotalBlocksEstimate()
     {
+        if (!GetBoolArg("-checkpoints", true))
+            return 0;
+
         MapCheckpoints& checkpoints = (fTestNet ? mapCheckpointsTestnet : mapCheckpoints);
 
         return checkpoints.rbegin()->first;
@@ -55,6 +61,9 @@ namespace Checkpoints
 
     CBlockIndex* GetLastCheckpoint(const std::map<uint256, CBlockIndex*>& mapBlockIndex)
     {
+        if (!GetBoolArg("-checkpoints", true))
+            return NULL;
+
         MapCheckpoints& checkpoints = (fTestNet ? mapCheckpointsTestnet : mapCheckpoints);
 
         BOOST_REVERSE_FOREACH(const MapCheckpoints::value_type& i, checkpoints)
diff --git a/src/init.cpp b/src/init.cpp
index 39259c5b7a..74533e49e1 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -258,6 +258,7 @@ std::string HelpMessage()
         "  -onlynet=<net>         " + _("Only connect to nodes in network <net> (IPv4, IPv6 or Tor)") + "\n" +
         "  -discover              " + _("Discover own IP address (default: 1 when listening and no -externalip)") + "\n" +
         "  -irc                   " + _("Find peers using internet relay chat (default: 0)") + "\n" +
+        "  -checkpoints           " + _("Lock in block chain with compiled-in checkpoints (default: 1)") + "\n" +
         "  -listen                " + _("Accept connections from outside (default: 1 if no -proxy or -connect)") + "\n" +
         "  -bind=<addr>           " + _("Bind to given address and always listen on it. Use [host]:port notation for IPv6") + "\n" +
         "  -dnsseed               " + _("Find peers using DNS lookup (default: 1 unless -connect)") + "\n" +
@@ -345,7 +346,7 @@ void ThreadImport(void *data) {
     if (fReindex) {
         CImportingNow imp;
         int nFile = 0;
-        while (!fShutdown) {
+        while (!fRequestShutdown) {
             CDiskBlockPos pos(nFile, 0);
             FILE *file = OpenBlockFile(pos, true);
             if (!file)
@@ -354,7 +355,7 @@ void ThreadImport(void *data) {
             LoadExternalBlockFile(file, &pos);
             nFile++;
         }
-        if (!fShutdown) {
+        if (!fRequestShutdown) {
             pblocktree->WriteReindexing(false);
             fReindex = false;
             printf("Reindexing finished\n");
@@ -363,7 +364,7 @@ void ThreadImport(void *data) {
 
     // hardcoded $DATADIR/bootstrap.dat
     filesystem::path pathBootstrap = GetDataDir() / "bootstrap.dat";
-    if (filesystem::exists(pathBootstrap) && !fShutdown) {
+    if (filesystem::exists(pathBootstrap) && !fRequestShutdown) {
         FILE *file = fopen(pathBootstrap.string().c_str(), "rb");
         if (file) {
             CImportingNow imp;
@@ -376,7 +377,7 @@ void ThreadImport(void *data) {
 
     // -loadblock=
     BOOST_FOREACH(boost::filesystem::path &path, import->vFiles) {
-        if (fShutdown)
+        if (fRequestShutdown)
             break;
         FILE *file = fopen(path.string().c_str(), "rb");
         if (file) {
@@ -481,6 +482,7 @@ bool AppInit2()
     // ********************************************************* Step 3: parameter-to-internal-flags
 
     fDebug = GetBoolArg("-debug");
+    fBenchmark = GetBoolArg("-benchmark");
 
     // -debug implies fDebug*
     if (fDebug)
@@ -865,7 +867,7 @@ bool AppInit2()
         if (walletdb.ReadBestBlock(locator))
             pindexRescan = locator.GetBlockIndex();
     }
-    if (pindexBest != pindexRescan)
+    if (pindexBest && pindexBest != pindexRescan)
     {
         uiInterface.InitMessage(_("Rescanning..."));
         printf("Rescanning last %i blocks (from block %i)...\n", pindexBest->nHeight - pindexRescan->nHeight, pindexRescan->nHeight);
diff --git a/src/leveldb/build_detect_platform b/src/leveldb/build_detect_platform
index dd982236fd..566d1f83a4 100755
--- a/src/leveldb/build_detect_platform
+++ b/src/leveldb/build_detect_platform
@@ -119,6 +119,16 @@ case "$TARGET_OS" in
         PLATFORM_EXTRALIBS="-lboost_system-mt-s -lboost_filesystem-mt-s -lboost_thread_win32-mt-s"
         CROSS_COMPILE=true
         ;;
+    NATIVE_WINDOWS)
+        PLATFORM=OS_WINDOWS
+        COMMON_FLAGS="-fno-builtin-memcmp -D_REENTRANT -DOS_WINDOWS -DLEVELDB_PLATFORM_WINDOWS -DBOOST_THREAD_USE_LIB"
+        PLATFORM_CXXFLAGS=""
+        PLATFORM_LDFLAGS=""
+        PLATFORM_SHARED_CFLAGS=""
+        PLATFORM_SOURCES="port/port_win.cc util/env_boost.cc util/win_logger.cc"
+        PLATFORM_EXTRALIBS="-lboost_system-mgw45-mt-s-1_50 -lboost_filesystem-mgw45-mt-s-1_50 -lboost_thread-mgw45-mt-s-1_50 -lboost_chrono-mgw45-mt-s-1_50"
+        CROSS_COMPILE=true
+	    ;;
     *)
         echo "Unknown platform!" >&2
         exit 1
diff --git a/src/main.cpp b/src/main.cpp
index db12c63932..96bdabd586 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -42,6 +42,7 @@ set<CBlockIndex*, CBlockIndexWorkComparator> setBlockIndexValid; // may contain
 int64 nTimeBestReceived = 0;
 bool fImporting = false;
 bool fReindex = false;
+bool fBenchmark = false;
 unsigned int nCoinCacheSize = 5000;
 
 CMedianFilter<int> cPeerBlockCounts(5, 0); // Amount of blocks that other nodes claim to have
@@ -1240,9 +1241,12 @@ bool ConnectBestBlock() {
 
             if (pindexTest->pprev == NULL || pindexTest->pnext != NULL) {
                 reverse(vAttach.begin(), vAttach.end());
-                BOOST_FOREACH(CBlockIndex *pindexSwitch, vAttach)
+                BOOST_FOREACH(CBlockIndex *pindexSwitch, vAttach) {
+                    if (fRequestShutdown)
+                        break;
                     if (!SetBestChain(pindexSwitch))
                         return false;
+                }
                 return true;
             }
             pindexTest = pindexTest->pprev;
@@ -1590,12 +1594,16 @@ bool CBlock::ConnectBlock(CBlockIndex* pindex, CCoinsViewCache &view, bool fJust
 
     CBlockUndo blockundo;
 
+    int64 nStart = GetTimeMicros();
     int64 nFees = 0;
+    int nInputs = 0;
     unsigned int nSigOps = 0;
     for (unsigned int i=0; i<vtx.size(); i++)
     {
+
         const CTransaction &tx = vtx[i];
 
+        nInputs += tx.vin.size();
         nSigOps += tx.GetLegacySigOpCount();
         if (nSigOps > MAX_BLOCK_SIGOPS)
             return DoS(100, error("ConnectBlock() : too many sigops"));
@@ -1626,7 +1634,11 @@ bool CBlock::ConnectBlock(CBlockIndex* pindex, CCoinsViewCache &view, bool fJust
             return error("ConnectBlock() : UpdateInputs failed");
         if (!tx.IsCoinBase())
             blockundo.vtxundo.push_back(txundo);
+
     }
+    int64 nTime = GetTimeMicros() - nStart;
+    if (fBenchmark)
+        printf("- Connect %u transactions: %.2fms (%.3fms/tx, %.3fms/txin)\n", (unsigned)vtx.size(), 0.001 * nTime, 0.001 * nTime / vtx.size(), nInputs <= 1 ? 0 : 0.001 * nTime / (nInputs-1));
 
     if (vtx[0].GetValueOut() > GetBlockValue(pindex->nHeight, nFees))
         return error("ConnectBlock() : coinbase pays too much (actual=%"PRI64d" vs limit=%"PRI64d")", vtx[0].GetValueOut(), GetBlockValue(pindex->nHeight, nFees));
@@ -1691,7 +1703,7 @@ bool SetBestChain(CBlockIndex* pindexNew)
     // Find the fork (typically, there is none)
     CBlockIndex* pfork = view.GetBestBlock();
     CBlockIndex* plonger = pindexNew;
-    while (pfork != plonger)
+    while (pfork && pfork != plonger)
     {
         while (plonger->nHeight > pfork->nHeight)
             if (!(plonger = plonger->pprev))
@@ -1724,8 +1736,11 @@ bool SetBestChain(CBlockIndex* pindexNew)
         CBlock block;
         if (!block.ReadFromDisk(pindex))
             return error("SetBestBlock() : ReadFromDisk for disconnect failed");
+        int64 nStart = GetTimeMicros();
         if (!block.DisconnectBlock(pindex, view))
             return error("SetBestBlock() : DisconnectBlock %s failed", BlockHashStr(pindex->GetBlockHash()).c_str());
+        if (fBenchmark)
+            printf("- Disconnect: %.2fms\n", (GetTimeMicros() - nStart) * 0.001);
 
         // Queue memory transactions to resurrect.
         // We only do this for blocks after the last checkpoint (reorganisation before that
@@ -1741,11 +1756,14 @@ bool SetBestChain(CBlockIndex* pindexNew)
         CBlock block;
         if (!block.ReadFromDisk(pindex))
             return error("SetBestBlock() : ReadFromDisk for connect failed");
+        int64 nStart = GetTimeMicros();
         if (!block.ConnectBlock(pindex, view)) {
             InvalidChainFound(pindexNew);
             InvalidBlockFound(pindex);
             return error("SetBestBlock() : ConnectBlock %s failed", BlockHashStr(pindex->GetBlockHash()).c_str());
         }
+        if (fBenchmark)
+            printf("- Connect: %.2fms\n", (GetTimeMicros() - nStart) * 0.001); 
 
         // Queue memory transactions to delete
         BOOST_FOREACH(const CTransaction& tx, block.vtx)
@@ -1753,8 +1771,13 @@ bool SetBestChain(CBlockIndex* pindexNew)
     }
 
     // Flush changes to global coin state
+    int64 nStart = GetTimeMicros();
+    int nModified = view.GetCacheSize();
     if (!view.Flush())
         return error("SetBestBlock() : unable to modify coin state");
+    int64 nTime = GetTimeMicros() - nStart;
+    if (fBenchmark)
+        printf("- Flush %i transactions: %.2fms (%.4fms/tx)\n", nModified, 0.001 * nTime, 0.001 * nTime / nModified);
 
     // Make sure it's successfully written to disk before changing memory structure
     bool fIsInitialDownload = IsInitialBlockDownload();
@@ -1897,6 +1920,7 @@ bool FindBlockPos(CDiskBlockPos &pos, unsigned int nAddSize, unsigned int nHeigh
             nLastBlockFile = pos.nFile;
             infoLastBlockFile.SetNull();
             pblocktree->ReadBlockFileInfo(nLastBlockFile, infoLastBlockFile);
+            fUpdatedLast = true;
         }
     } else {
         while (infoLastBlockFile.nSize + nAddSize >= MAX_BLOCKFILE_SIZE) {
@@ -2326,13 +2350,18 @@ bool static LoadBlockIndexDB()
     if (pblocktree->ReadBlockFileInfo(nLastBlockFile, infoLastBlockFile))
         printf("LoadBlockIndex(): last block file: %s\n", infoLastBlockFile.ToString().c_str());
 
+    // Load bnBestInvalidWork, OK if it doesn't exist
+    pblocktree->ReadBestInvalidWork(bnBestInvalidWork);
+
+    // Check whether we need to continue reindexing
+    bool fReindexing = false;
+    pblocktree->ReadReindexing(fReindexing);
+    fReindex |= fReindexing;
+
     // Load hashBestChain pointer to end of best chain
     pindexBest = pcoinsTip->GetBestBlock();
     if (pindexBest == NULL)
-    {
-        if (pindexGenesisBlock == NULL)
-            return true;
-    }
+        return true;
     hashBestChain = pindexBest->GetBlockHash();
     nBestHeight = pindexBest->nHeight;
     bnBestChainWork = pindexBest->bnChainWork;
@@ -2348,14 +2377,6 @@ bool static LoadBlockIndexDB()
         BlockHashStr(hashBestChain).c_str(), nBestHeight,
         DateTimeStrFormat("%Y-%m-%dT%H:%M:%S", pindexBest->GetBlockTime()).c_str());
 
-    // Load bnBestInvalidWork, OK if it doesn't exist
-    pblocktree->ReadBestInvalidWork(bnBestInvalidWork);
-
-    // Check whether we need to continue reindexing
-    bool fReindexing = false;
-    pblocktree->ReadReindexing(fReindexing);
-    fReindex |= fReindexing;
-
     // Verify blocks in the best chain
     int nCheckLevel = GetArg("-checklevel", 1);
     int nCheckDepth = GetArg( "-checkblocks", 2500);
@@ -2556,7 +2577,7 @@ bool LoadExternalBlockFile(FILE* fileIn, CDiskBlockPos *dbp)
             }
         }
         uint64 nRewind = blkdat.GetPos();
-        while (blkdat.good() && !blkdat.eof() && !fShutdown) {
+        while (blkdat.good() && !blkdat.eof() && !fRequestShutdown) {
             blkdat.SetPos(nRewind);
             nRewind++; // start one byte further next time, in case of failure
             blkdat.SetLimit(); // remove former limit
diff --git a/src/main.h b/src/main.h
index fbd68127a4..fdaec3469e 100644
--- a/src/main.h
+++ b/src/main.h
@@ -89,6 +89,7 @@ extern std::set<CWallet*> setpwalletRegistered;
 extern unsigned char pchMessageStart[4];
 extern bool fImporting;
 extern bool fReindex;
+extern bool fBenchmark;
 extern unsigned int nCoinCacheSize;
 
 // Settings
diff --git a/src/makefile.mingw b/src/makefile.mingw
index fd61d44709..22d65d6703 100644
--- a/src/makefile.mingw
+++ b/src/makefile.mingw
@@ -97,7 +97,7 @@ DEFS += $(addprefix -I,$(CURDIR)/leveldb/helpers)
 # TODO: If this fails, try adding a ranlib libleveldb.a && ranlib libmemenv.a
 leveldb/libleveldb.a:
 	cd leveldb && $(MAKE) libleveldb.a libmemenv.a && cd ..
-obj/leveldb.o: leveldb/libleveldb.lib
+obj/leveldb.o: leveldb/libleveldb.a
 
 obj/%.o: %.cpp $(HEADERS)
 	g++ -c $(CFLAGS) -o $@ $<
diff --git a/src/net.h b/src/net.h
index c43e438d5a..ace119f954 100644
--- a/src/net.h
+++ b/src/net.h
@@ -305,7 +305,8 @@ public:
 
 
 
-    void BeginMessage(const char* pszCommand)
+    // TODO: Document the postcondition of this function.  Is cs_vSend locked?
+    void BeginMessage(const char* pszCommand) EXCLUSIVE_LOCK_FUNCTION(cs_vSend)
     {
         ENTER_CRITICAL_SECTION(cs_vSend);
         if (nHeaderStart != -1)
@@ -317,7 +318,8 @@ public:
             printf("sending: %s ", pszCommand);
     }
 
-    void AbortMessage()
+    // TODO: Document the precondition of this function.  Is cs_vSend locked?
+    void AbortMessage() UNLOCK_FUNCTION(cs_vSend)
     {
         if (nHeaderStart < 0)
             return;
@@ -330,7 +332,8 @@ public:
             printf("(aborted)\n");
     }
 
-    void EndMessage()
+    // TODO: Document the precondition of this function.  Is cs_vSend locked?
+    void EndMessage() UNLOCK_FUNCTION(cs_vSend)
     {
         if (mapArgs.count("-dropmessagestest") && GetRand(atoi(mapArgs["-dropmessagestest"])) == 0)
         {
@@ -362,19 +365,6 @@ public:
         LEAVE_CRITICAL_SECTION(cs_vSend);
     }
 
-    void EndMessageAbortIfEmpty()
-    {
-        if (nHeaderStart < 0)
-            return;
-        int nSize = vSend.size() - nMessageStart;
-        if (nSize > 0)
-            EndMessage();
-        else
-            AbortMessage();
-    }
-
-
-
     void PushVersion();
 
 
diff --git a/src/qt/bitcoingui.cpp b/src/qt/bitcoingui.cpp
index 3fe86501f6..9cd22ed297 100644
--- a/src/qt/bitcoingui.cpp
+++ b/src/qt/bitcoingui.cpp
@@ -697,39 +697,33 @@ void BitcoinGUI::askFee(qint64 nFeeRequired, bool *payFee)
     *payFee = (retval == QMessageBox::Yes);
 }
 
-void BitcoinGUI::incomingTransaction(const QModelIndex & parent, int start, int end)
+void BitcoinGUI::incomingTransaction(const QModelIndex& parent, int start, int /*end*/)
 {
-    if(!walletModel || !clientModel)
+    // Prevent balloon-spam when initial block download is in progress
+    if(!walletModel || !clientModel || clientModel->inInitialBlockDownload())
         return;
+
     TransactionTableModel *ttm = walletModel->getTransactionTableModel();
+
+    QString date = ttm->index(start, TransactionTableModel::Date, parent)
+                     .data().toString();
     qint64 amount = ttm->index(start, TransactionTableModel::Amount, parent)
-                    .data(Qt::EditRole).toULongLong();
-    if(!clientModel->inInitialBlockDownload())
-    {
-        // On new transaction, make an info balloon
-        // Unless the initial block download is in progress, to prevent balloon-spam
-        QString date = ttm->index(start, TransactionTableModel::Date, parent)
-                        .data().toString();
-        QString type = ttm->index(start, TransactionTableModel::Type, parent)
+                      .data(Qt::EditRole).toULongLong();
+    QString type = ttm->index(start, TransactionTableModel::Type, parent)
+                     .data().toString();
+    QString address = ttm->index(start, TransactionTableModel::ToAddress, parent)
                         .data().toString();
-        QString address = ttm->index(start, TransactionTableModel::ToAddress, parent)
-                        .data().toString();
-        QIcon icon = qvariant_cast<QIcon>(ttm->index(start,
-                            TransactionTableModel::ToAddress, parent)
-                        .data(Qt::DecorationRole));
 
-        notificator->notify(Notificator::Information,
-                            (amount)<0 ? tr("Sent transaction") :
-                                         tr("Incoming transaction"),
-                              tr("Date: %1\n"
-                                 "Amount: %2\n"
-                                 "Type: %3\n"
-                                 "Address: %4\n")
-                              .arg(date)
-                              .arg(BitcoinUnits::formatWithUnit(walletModel->getOptionsModel()->getDisplayUnit(), amount, true))
-                              .arg(type)
-                              .arg(address), icon);
-    }
+    // On new transaction, make an info balloon
+    message((amount)<0 ? tr("Sent transaction") : tr("Incoming transaction"),
+             tr("Date: %1\n"
+                "Amount: %2\n"
+                "Type: %3\n"
+                "Address: %4\n")
+                  .arg(date)
+                  .arg(BitcoinUnits::formatWithUnit(walletModel->getOptionsModel()->getDisplayUnit(), amount, true))
+                  .arg(type)
+                  .arg(address), CClientUIInterface::MSG_INFORMATION);
 }
 
 void BitcoinGUI::gotoOverviewPage()
@@ -821,7 +815,8 @@ void BitcoinGUI::dropEvent(QDropEvent *event)
         if (nValidUrisFound)
             gotoSendCoinsPage();
         else
-            notificator->notify(Notificator::Warning, tr("URI handling"), tr("URI can not be parsed! This can be caused by an invalid Bitcoin address or malformed URI parameters."));
+            message(tr("URI handling"), tr("URI can not be parsed! This can be caused by an invalid Bitcoin address or malformed URI parameters."),
+                      CClientUIInterface::ICON_WARNING);
     }
 
     event->acceptProposedAction();
@@ -848,7 +843,8 @@ void BitcoinGUI::handleURI(QString strURI)
         gotoSendCoinsPage();
     }
     else
-        notificator->notify(Notificator::Warning, tr("URI handling"), tr("URI can not be parsed! This can be caused by an invalid Bitcoin address or malformed URI parameters."));
+        message(tr("URI handling"), tr("URI can not be parsed! This can be caused by an invalid Bitcoin address or malformed URI parameters."),
+                  CClientUIInterface::ICON_WARNING);
 }
 
 void BitcoinGUI::setEncryptionStatus(int status)
@@ -898,8 +894,12 @@ void BitcoinGUI::backupWallet()
     QString filename = QFileDialog::getSaveFileName(this, tr("Backup Wallet"), saveDir, tr("Wallet Data (*.dat)"));
     if(!filename.isEmpty()) {
         if(!walletModel->backupWallet(filename)) {
-            QMessageBox::warning(this, tr("Backup Failed"), tr("There was an error trying to save the wallet data to the new location."));
+            message(tr("Backup Failed"), tr("There was an error trying to save the wallet data to the new location."),
+                      CClientUIInterface::MSG_ERROR);
         }
+        else
+            message(tr("Backup Successful"), tr("The wallet data was successfully saved to the new location."),
+                      CClientUIInterface::MSG_INFORMATION);
     }
 }
 
diff --git a/src/qt/bitcoingui.h b/src/qt/bitcoingui.h
index 3faf6d948c..b7afdb1c8c 100644
--- a/src/qt/bitcoingui.h
+++ b/src/qt/bitcoingui.h
@@ -168,7 +168,7 @@ private slots:
 
         The new items are those between start and end inclusive, under the given parent item.
     */
-    void incomingTransaction(const QModelIndex & parent, int start, int end);
+    void incomingTransaction(const QModelIndex& parent, int start, int /*end*/);
     /** Encrypt the wallet */
     void encryptWallet(bool status);
     /** Backup the wallet */
diff --git a/src/qt/optionsmodel.cpp b/src/qt/optionsmodel.cpp
index e3c9413f1b..5dac5a6c45 100644
--- a/src/qt/optionsmodel.cpp
+++ b/src/qt/optionsmodel.cpp
@@ -137,7 +137,11 @@ QVariant OptionsModel::data(const QModelIndex & index, int role) const
         case MinimizeToTray:
             return QVariant(fMinimizeToTray);
         case MapPortUPnP:
+#ifdef USE_UPNP
             return settings.value("fUseUPnP", GetBoolArg("-upnp", true));
+#else
+            return QVariant(false);
+#endif
         case MinimizeOnClose:
             return QVariant(fMinimizeOnClose);
         case ProxyUse: {
diff --git a/src/rpcdump.cpp b/src/rpcdump.cpp
index 55d5d79e23..77cef02736 100644
--- a/src/rpcdump.cpp
+++ b/src/rpcdump.cpp
@@ -34,15 +34,21 @@ public:
 
 Value importprivkey(const Array& params, bool fHelp)
 {
-    if (fHelp || params.size() < 1 || params.size() > 2)
+    if (fHelp || params.size() < 1 || params.size() > 3)
         throw runtime_error(
-            "importprivkey <bitcoinprivkey> [label]\n"
+            "importprivkey <bitcoinprivkey> [label] [rescan=true]\n"
             "Adds a private key (as returned by dumpprivkey) to your wallet.");
 
     string strSecret = params[0].get_str();
     string strLabel = "";
     if (params.size() > 1)
         strLabel = params[1].get_str();
+
+    // Whether to perform rescan after import
+    bool fRescan = true;
+    if (params.size() > 2)
+        fRescan = params[2].get_bool();
+
     CBitcoinSecret vchSecret;
     bool fGood = vchSecret.SetString(strSecret);
 
@@ -61,9 +67,11 @@ Value importprivkey(const Array& params, bool fHelp)
 
         if (!pwalletMain->AddKey(key))
             throw JSONRPCError(RPC_WALLET_ERROR, "Error adding key to wallet");
-
-        pwalletMain->ScanForWalletTransactions(pindexGenesisBlock, true);
-        pwalletMain->ReacceptWalletTransactions();
+	
+        if (fRescan) {
+            pwalletMain->ScanForWalletTransactions(pindexGenesisBlock, true);
+            pwalletMain->ReacceptWalletTransactions();
+        }
     }
 
     return Value::null;
diff --git a/src/rpcwallet.cpp b/src/rpcwallet.cpp
index d597e5e3f7..90a68f560a 100644
--- a/src/rpcwallet.cpp
+++ b/src/rpcwallet.cpp
@@ -3,14 +3,18 @@
 // Distributed under the MIT/X11 software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+#include <boost/assign/list_of.hpp>
+
 #include "wallet.h"
 #include "walletdb.h"
 #include "bitcoinrpc.h"
 #include "init.h"
 #include "base58.h"
 
-using namespace json_spirit;
 using namespace std;
+using namespace boost;
+using namespace boost::assign;
+using namespace json_spirit;
 
 int64 nWalletUnlockTime;
 static CCriticalSection cs_nWalletUnlockTime;
@@ -1497,3 +1501,74 @@ Value validateaddress(const Array& params, bool fHelp)
     return ret;
 }
 
+Value lockunspent(const Array& params, bool fHelp)
+{
+    if (fHelp || params.size() < 1 || params.size() > 2)
+        throw runtime_error(
+            "lockunspent unlock? [array-of-Objects]\n"
+            "Updates list of temporarily unspendable outputs.");
+
+    if (params.size() == 1)
+        RPCTypeCheck(params, list_of(bool_type));
+    else
+        RPCTypeCheck(params, list_of(bool_type)(array_type));
+
+    bool fUnlock = params[0].get_bool();
+
+    if (params.size() == 1) {
+        if (fUnlock)
+            pwalletMain->UnlockAllCoins();
+        return true;
+    }
+
+    Array outputs = params[1].get_array();
+    BOOST_FOREACH(Value& output, outputs)
+    {
+        if (output.type() != obj_type)
+            throw JSONRPCError(-8, "Invalid parameter, expected object");
+        const Object& o = output.get_obj();
+
+        RPCTypeCheck(o, map_list_of("txid", str_type)("vout", int_type));
+
+        string txid = find_value(o, "txid").get_str();
+        if (!IsHex(txid))
+            throw JSONRPCError(-8, "Invalid parameter, expected hex txid");
+
+        int nOutput = find_value(o, "vout").get_int();
+        if (nOutput < 0)
+            throw JSONRPCError(-8, "Invalid parameter, vout must be positive");
+
+        COutPoint outpt(uint256(txid), nOutput);
+
+        if (fUnlock)
+            pwalletMain->UnlockCoin(outpt);
+        else
+            pwalletMain->LockCoin(outpt);
+    }
+
+    return true;
+}
+
+Value listlockunspent(const Array& params, bool fHelp)
+{
+    if (fHelp || params.size() > 0)
+        throw runtime_error(
+            "listlockunspent\n"
+            "Returns list of temporarily unspendable outputs.");
+
+    vector<COutPoint> vOutpts;
+    pwalletMain->ListLockedCoins(vOutpts);
+
+    Array ret;
+
+    BOOST_FOREACH(COutPoint &outpt, vOutpts) {
+        Object o;
+
+        o.push_back(Pair("txid", outpt.hash.GetHex()));
+        o.push_back(Pair("vout", (int)outpt.n));
+        ret.push_back(o);
+    }
+
+    return ret;
+}
+
diff --git a/src/sync.h b/src/sync.h
index 9dfc6697c6..930c9b2b80 100644
--- a/src/sync.h
+++ b/src/sync.h
@@ -9,15 +9,36 @@
 #include <boost/thread/recursive_mutex.hpp>
 #include <boost/thread/locks.hpp>
 #include <boost/thread/condition_variable.hpp>
+#include "threadsafety.h"
 
+// Template mixin that adds -Wthread-safety locking annotations to a
+// subset of the mutex API.
+template <typename PARENT>
+class LOCKABLE AnnotatedMixin : public PARENT
+{
+public:
+    void lock() EXCLUSIVE_LOCK_FUNCTION()
+    {
+      PARENT::lock();
+    }
 
+    void unlock() UNLOCK_FUNCTION()
+    {
+      PARENT::unlock();
+    }
 
+    bool try_lock() EXCLUSIVE_TRYLOCK_FUNCTION(true)
+    {
+      return PARENT::try_lock();
+    }
+};
 
 /** Wrapped boost mutex: supports recursive locking, but no waiting  */
-typedef boost::recursive_mutex CCriticalSection;
+// TODO: We should move away from using the recursive lock by default.
+typedef AnnotatedMixin<boost::recursive_mutex> CCriticalSection;
 
 /** Wrapped boost mutex: supports waiting but not recursive locking */
-typedef boost::mutex CWaitableCriticalSection;
+typedef AnnotatedMixin<boost::mutex> CWaitableCriticalSection;
 
 #ifdef DEBUG_LOCKORDER
 void EnterCritical(const char* pszName, const char* pszFile, int nLine, void* cs, bool fTry = false);
diff --git a/src/test/bignum_tests.cpp b/src/test/bignum_tests.cpp
index 744681871f..5b898d1499 100644
--- a/src/test/bignum_tests.cpp
+++ b/src/test/bignum_tests.cpp
@@ -122,4 +122,57 @@ BOOST_AUTO_TEST_CASE(bignum_setint64)
     }
 }
 
+
+BOOST_AUTO_TEST_CASE(bignum_SetCompact)
+{
+    CBigNum num;
+    num.SetCompact(0);
+    BOOST_CHECK_EQUAL(num.GetHex(), "0");
+    BOOST_CHECK_EQUAL(num.GetCompact(), 0);
+
+    num.SetCompact(0x00123456);
+    BOOST_CHECK_EQUAL(num.GetHex(), "0");
+    BOOST_CHECK_EQUAL(num.GetCompact(), 0);
+
+    num.SetCompact(0x01123456);
+    BOOST_CHECK_EQUAL(num.GetHex(), "12");
+    BOOST_CHECK_EQUAL(num.GetCompact(), 0x01120000);
+
+    // Make sure that we don't generate compacts with the 0x00800000 bit set
+    num = 0x80;
+    BOOST_CHECK_EQUAL(num.GetCompact(), 0x02008000);
+
+    num.SetCompact(0x01fedcba);
+    BOOST_CHECK_EQUAL(num.GetHex(), "-7e");
+    BOOST_CHECK_EQUAL(num.GetCompact(), 0x01fe0000);
+
+    num.SetCompact(0x02123456);
+    BOOST_CHECK_EQUAL(num.GetHex(), "1234");
+    BOOST_CHECK_EQUAL(num.GetCompact(), 0x02123400);
+
+    num.SetCompact(0x03123456);
+    BOOST_CHECK_EQUAL(num.GetHex(), "123456");
+    BOOST_CHECK_EQUAL(num.GetCompact(), 0x03123456);
+
+    num.SetCompact(0x04123456);
+    BOOST_CHECK_EQUAL(num.GetHex(), "12345600");
+    BOOST_CHECK_EQUAL(num.GetCompact(), 0x04123456);
+
+    num.SetCompact(0x04923456);
+    BOOST_CHECK_EQUAL(num.GetHex(), "-12345600");
+    BOOST_CHECK_EQUAL(num.GetCompact(), 0x04923456);
+
+    num.SetCompact(0x05009234);
+    BOOST_CHECK_EQUAL(num.GetHex(), "92340000");
+    BOOST_CHECK_EQUAL(num.GetCompact(), 0x05009234);
+
+    num.SetCompact(0x20123456);
+    BOOST_CHECK_EQUAL(num.GetHex(), "1234560000000000000000000000000000000000000000000000000000000000");
+    BOOST_CHECK_EQUAL(num.GetCompact(), 0x20123456);
+
+    num.SetCompact(0xff123456);
+    BOOST_CHECK_EQUAL(num.GetHex(), "123456000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000");
+    BOOST_CHECK_EQUAL(num.GetCompact(), 0xff123456);
+}
+
 BOOST_AUTO_TEST_SUITE_END()
diff --git a/src/threadsafety.h b/src/threadsafety.h
new file mode 100644
index 0000000000..3d3d526fd6
--- /dev/null
+++ b/src/threadsafety.h
@@ -0,0 +1,53 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2012 The Bitcoin developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+#ifndef BITCOIN_THREADSAFETY_H
+#define BITCOIN_THREADSAFETY_H
+
+#ifdef __clang__
+// TL;DR Add GUARDED_BY(mutex) to member variables. The others are
+// rarely necessary. Ex: int nFoo GUARDED_BY(cs_foo);
+//
+// See http://clang.llvm.org/docs/LanguageExtensions.html#threadsafety
+// for documentation.  The clang compiler can do advanced static analysis
+// of locking when given the -Wthread-safety option.
+#define LOCKABLE                        __attribute__ ((lockable))
+#define SCOPED_LOCKABLE                 __attribute__ ((scoped_lockable))
+#define GUARDED_BY(x)                   __attribute__ ((guarded_by(x)))
+#define GUARDED_VAR                     __attribute__ ((guarded_var))
+#define PT_GUARDED_BY(x)                __attribute__ ((pt_guarded_by(x)))
+#define PT_GUARDED_VAR                  __attribute__ ((pt_guarded_var))
+#define ACQUIRED_AFTER(...)             __attribute__ ((acquired_after(__VA_ARGS__)))
+#define ACQUIRED_BEFORE(...)            __attribute__ ((acquired_before(__VA_ARGS__)))
+#define EXCLUSIVE_LOCK_FUNCTION(...)    __attribute__ ((exclusive_lock_function(__VA_ARGS__)))
+#define SHARED_LOCK_FUNCTION(...)       __attribute__ ((shared_lock_function(__VA_ARGS__)))
+#define EXCLUSIVE_TRYLOCK_FUNCTION(...) __attribute__ ((exclusive_trylock_function(__VA_ARGS__)))
+#define SHARED_TRYLOCK_FUNCTION(...)    __attribute__ ((shared_trylock_function(__VA_ARGS__)))
+#define UNLOCK_FUNCTION(...)            __attribute__ ((unlock_function(__VA_ARGS__)))
+#define LOCK_RETURNED(x)                __attribute__ ((lock_returned(x)))
+#define LOCKS_EXCLUDED(...)             __attribute__ ((locks_excluded(__VA_ARGS__)))
+#define EXCLUSIVE_LOCKS_REQUIRED(...)   __attribute__ ((exclusive_locks_required(__VA_ARGS__)))
+#define SHARED_LOCKS_REQUIRED(...)      __attribute__ ((shared_locks_required(__VA_ARGS__)))
+#define NO_THREAD_SAFETY_ANALYSIS       __attribute__ ((no_thread_safety_analysis))
+#else
+#define LOCKABLE
+#define SCOPED_LOCKABLE
+#define GUARDED_BY(x)
+#define GUARDED_VAR
+#define PT_GUARDED_BY(x)
+#define PT_GUARDED_VAR
+#define ACQUIRED_AFTER(...)
+#define ACQUIRED_BEFORE(...)
+#define EXCLUSIVE_LOCK_FUNCTION(...)
+#define SHARED_LOCK_FUNCTION(...)
+#define EXCLUSIVE_TRYLOCK_FUNCTION(...)
+#define SHARED_TRYLOCK_FUNCTION(...)
+#define UNLOCK_FUNCTION(...)
+#define LOCK_RETURNED(x)
+#define LOCKS_EXCLUDED(...)
+#define EXCLUSIVE_LOCKS_REQUIRED(...)
+#define SHARED_LOCKS_REQUIRED(...)
+#define NO_THREAD_SAFETY_ANALYSIS
+#endif  // __GNUC__
+#endif  // BITCOIN_THREADSAFETY_H
diff --git a/src/util.cpp b/src/util.cpp
index 194218590d..806f3ebcf6 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -64,7 +64,7 @@ bool fDebug = false;
 bool fDebugNet = false;
 bool fPrintToConsole = false;
 bool fPrintToDebugger = false;
-bool fRequestShutdown = false;
+volatile bool fRequestShutdown = false;
 bool fShutdown = false;
 bool fDaemon = false;
 bool fServer = false;
diff --git a/src/util.h b/src/util.h
index ada0dd3790..ab921e6f05 100644
--- a/src/util.h
+++ b/src/util.h
@@ -132,7 +132,7 @@ extern bool fDebug;
 extern bool fDebugNet;
 extern bool fPrintToConsole;
 extern bool fPrintToDebugger;
-extern bool fRequestShutdown;
+extern volatile bool fRequestShutdown;
 extern bool fShutdown;
 extern bool fDaemon;
 extern bool fServer;
@@ -330,6 +330,12 @@ inline int64 GetTimeMillis()
             boost::posix_time::ptime(boost::gregorian::date(1970,1,1))).total_milliseconds();
 }
 
+inline int64 GetTimeMicros()
+{
+    return (boost::posix_time::ptime(boost::posix_time::microsec_clock::universal_time()) -
+            boost::posix_time::ptime(boost::gregorian::date(1970,1,1))).total_microseconds();
+}
+
 inline std::string DateTimeStrFormat(const char* pszFormat, int64 nTime)
 {
     time_t n = nTime;
diff --git a/src/wallet.cpp b/src/wallet.cpp
index cedda9e9e0..c07adff6c6 100644
--- a/src/wallet.cpp
+++ b/src/wallet.cpp
@@ -957,9 +957,11 @@ void CWallet::AvailableCoins(vector<COutput>& vCoins, bool fOnlyConfirmed) const
             if (pcoin->IsCoinBase() && pcoin->GetBlocksToMaturity() > 0)
                 continue;
 
-            for (unsigned int i = 0; i < pcoin->vout.size(); i++)
-                if (!(pcoin->IsSpent(i)) && IsMine(pcoin->vout[i]) && pcoin->vout[i].nValue > 0)
+            for (unsigned int i = 0; i < pcoin->vout.size(); i++) {
+                if (!(pcoin->IsSpent(i)) && IsMine(pcoin->vout[i]) &&
+                    !IsLockedCoin((*it).first, i) && pcoin->vout[i].nValue > 0)
                     vCoins.push_back(COutput(pcoin, i, pcoin->GetDepthInMainChain()));
+            }
         }
     }
 }
@@ -1770,3 +1772,35 @@ void CWallet::UpdatedTransaction(const uint256 &hashTx)
             NotifyTransactionChanged(this, hashTx, CT_UPDATED);
     }
 }
+
+void CWallet::LockCoin(COutPoint& output)
+{
+    setLockedCoins.insert(output);
+}
+
+void CWallet::UnlockCoin(COutPoint& output)
+{
+    setLockedCoins.erase(output);
+}
+
+void CWallet::UnlockAllCoins()
+{
+    setLockedCoins.clear();
+}
+
+bool CWallet::IsLockedCoin(uint256 hash, unsigned int n) const
+{
+    COutPoint outpt(hash, n);
+
+    return (setLockedCoins.count(outpt) > 0);
+}
+
+void CWallet::ListLockedCoins(std::vector<COutPoint>& vOutpts)
+{
+    for (std::set<COutPoint>::iterator it = setLockedCoins.begin();
+         it != setLockedCoins.end(); it++) {
+        COutPoint outpt = (*it);
+        vOutpts.push_back(outpt);
+    }
+}
+
diff --git a/src/wallet.h b/src/wallet.h
index 05d60056f4..ecfdafe2eb 100644
--- a/src/wallet.h
+++ b/src/wallet.h
@@ -119,11 +119,18 @@ public:
 
     CPubKey vchDefaultKey;
 
+    std::set<COutPoint> setLockedCoins;
+
     // check whether we are allowed to upgrade (or already support) to the named feature
     bool CanSupportFeature(enum WalletFeature wf) { return nWalletMaxVersion >= wf; }
 
     void AvailableCoins(std::vector<COutput>& vCoins, bool fOnlyConfirmed=true) const;
     bool SelectCoinsMinConf(int64 nTargetValue, int nConfMine, int nConfTheirs, std::vector<COutput> vCoins, std::set<std::pair<const CWalletTx*,unsigned int> >& setCoinsRet, int64& nValueRet) const;
+    bool IsLockedCoin(uint256 hash, unsigned int n) const;
+    void LockCoin(COutPoint& output);
+    void UnlockCoin(COutPoint& output);
+    void UnlockAllCoins();
+    void ListLockedCoins(std::vector<COutPoint>& vOutpts);
 
     // keystore implementation
     // Generate a new key