Merge pull request #5957

e2edf95 Bugfix: make CreateNewBlock return pindexPrev (Pieter Wuille)
6b04508 Introduce separate 'generate' RPC call (Pieter Wuille)
0df67f1 Simplify hash loop code (Pieter Wuille)

7 files changed, 131 insertions, 122 deletions

diff --git a/src/miner.cpp b/src/miner.cpp
index cf08b78229..7f01918eef 100644
--- a/src/miner.cpp
+++ b/src/miner.cpp
@@ -87,7 +87,7 @@ void UpdateTime(CBlockHeader* pblock, const CBlockIndex* pindexPrev)
         pblock->nBits = GetNextWorkRequired(pindexPrev, pblock, Params().GetConsensus());
 }
 
-CBlockTemplate* CreateNewBlock(const CScript& scriptPubKeyIn)
+CBlockTemplate* CreateNewBlock(const CScript& scriptPubKeyIn, CBlockIndex*& pindexPrev)
 {
     // Create new block
     auto_ptr<CBlockTemplate> pblocktemplate(new CBlockTemplate());
@@ -132,7 +132,7 @@ CBlockTemplate* CreateNewBlock(const CScript& scriptPubKeyIn)
 
     {
         LOCK2(cs_main, mempool.cs);
-        CBlockIndex* pindexPrev = chainActive.Tip();
+        pindexPrev = chainActive.Tip();
         const int nHeight = pindexPrev->nHeight + 1;
         CCoinsViewCache view(pcoinsTip);
 
@@ -365,45 +365,34 @@ void IncrementExtraNonce(CBlock* pblock, CBlockIndex* pindexPrev, unsigned int&
 
 //
 // ScanHash scans nonces looking for a hash with at least some zero bits.
-// The nonce is usually preserved between calls, but periodically or if the
-// nonce is 0xffff0000 or above, the block is rebuilt and nNonce starts over at
-// zero.
+// The nonce is usually preserved between calls, but periodically the block is
+// rebuilt and nNonce starts over at zero.
 //
-bool static ScanHash(const CBlockHeader *pblock, uint32_t& nNonce, uint256 *phash)
+bool static ScanHash(CBlockHeader *pblock, uint256 *phash)
 {
-    // Write the first 76 bytes of the block header to a double-SHA256 state.
-    CHash256 hasher;
-    CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
-    ss << *pblock;
-    assert(ss.size() == 80);
-    hasher.Write((unsigned char*)&ss[0], 76);
-
     while (true) {
-        nNonce++;
-
-        // Write the last 4 bytes of the block header (the nonce) to a copy of
-        // the double-SHA256 state, and compute the result.
-        CHash256(hasher).Write((unsigned char*)&nNonce, 4).Finalize((unsigned char*)phash);
+        pblock->nNonce++;
+        *phash = pblock->GetHash();
 
         // Return the nonce if the hash has at least some zero bits,
         // caller will check if it has enough to reach the target
         if (((uint16_t*)phash)[15] == 0)
             return true;
 
-        // If nothing found after trying for a while, return -1
-        if ((nNonce & 0xfff) == 0)
+        // If nothing found after trying for a while, return false.
+        if ((pblock->nNonce & 0xfff) == 0)
             return false;
     }
 }
 
-CBlockTemplate* CreateNewBlockWithKey(CReserveKey& reservekey)
+CBlockTemplate* CreateNewBlockWithKey(CReserveKey& reservekey, CBlockIndex*& pindexPrev)
 {
     CPubKey pubkey;
     if (!reservekey.GetReservedKey(pubkey))
         return NULL;
 
     CScript scriptPubKey = CScript() << ToByteVector(pubkey) << OP_CHECKSIG;
-    return CreateNewBlock(scriptPubKey);
+    return CreateNewBlock(scriptPubKey, pindexPrev);
 }
 
 static bool ProcessBlockFound(CBlock* pblock, CWallet& wallet, CReserveKey& reservekey)
@@ -435,6 +424,56 @@ static bool ProcessBlockFound(CBlock* pblock, CWallet& wallet, CReserveKey& rese
     return true;
 }
 
+bool static ScanLoop(CBlock *pblock, CBlockIndex *pindexPrev, CWallet *pwallet, CReserveKey& reservekey)
+{
+    UpdateTime(pblock, pindexPrev);
+    arith_uint256 hashTarget = arith_uint256().SetCompact(pblock->nBits);
+
+    uint256 hash;
+    if (ScanHash(pblock, &hash)) {
+        if (UintToArith256(hash) <= hashTarget) {
+            // Found a solution
+            SetThreadPriority(THREAD_PRIORITY_NORMAL);
+            LogPrintf("BitcoinMiner:\n");
+            LogPrintf("proof-of-work found  \n  hash: %s  \ntarget: %s\n", hash.GetHex(), hashTarget.GetHex());
+            ProcessBlockFound(pblock, *pwallet, reservekey);
+            SetThreadPriority(THREAD_PRIORITY_LOWEST);
+
+            return true;
+        }
+    }
+
+    return false;
+}
+
+bool MineBlock(CWallet *pwallet, uint256& hash)
+{
+    CReserveKey reservekey(pwallet);
+    unsigned int nExtraNonce = 0;
+
+    while (true) {
+        CBlockIndex *pindexPrev;
+
+        auto_ptr<CBlockTemplate> pblocktemplate(CreateNewBlockWithKey(reservekey, pindexPrev));
+        if (!pblocktemplate.get()) {
+            return false;
+        }
+
+        CBlock *pblock = &pblocktemplate->block;
+        IncrementExtraNonce(pblock, pindexPrev, nExtraNonce);
+
+        while (true) {
+            if (ScanLoop(pblock, pindexPrev, pwallet, reservekey)) {
+                hash = pblock->GetHash();
+                return true;
+            }
+            boost::this_thread::interruption_point();
+            if (pblock->nNonce >= 0xffff0000)
+                break;
+        }
+    }
+}
+
 void static BitcoinMiner(CWallet *pwallet)
 {
     LogPrintf("BitcoinMiner started\n");
@@ -458,9 +497,9 @@ void static BitcoinMiner(CWallet *pwallet)
             // Create new block
             //
             unsigned int nTransactionsUpdatedLast = mempool.GetTransactionsUpdated();
-            CBlockIndex* pindexPrev = chainActive.Tip();
+            CBlockIndex* pindexPrev;
 
-            auto_ptr<CBlockTemplate> pblocktemplate(CreateNewBlockWithKey(reservekey));
+            auto_ptr<CBlockTemplate> pblocktemplate(CreateNewBlockWithKey(reservekey, pindexPrev));
             if (!pblocktemplate.get())
             {
                 LogPrintf("Error in BitcoinMiner: Keypool ran out, please call keypoolrefill before restarting the mining thread\n");
@@ -476,52 +515,23 @@ void static BitcoinMiner(CWallet *pwallet)
             // Search
             //
             int64_t nStart = GetTime();
-            arith_uint256 hashTarget = arith_uint256().SetCompact(pblock->nBits);
-            uint256 hash;
-            uint32_t nNonce = 0;
             while (true) {
                 // Check if something found
-                if (ScanHash(pblock, nNonce, &hash))
-                {
-                    if (UintToArith256(hash) <= hashTarget)
-                    {
-                        // Found a solution
-                        pblock->nNonce = nNonce;
-                        assert(hash == pblock->GetHash());
-
-                        SetThreadPriority(THREAD_PRIORITY_NORMAL);
-                        LogPrintf("BitcoinMiner:\n");
-                        LogPrintf("proof-of-work found  \n  hash: %s  \ntarget: %s\n", hash.GetHex(), hashTarget.GetHex());
-                        ProcessBlockFound(pblock, *pwallet, reservekey);
-                        SetThreadPriority(THREAD_PRIORITY_LOWEST);
-
-                        // In regression test mode, stop mining after a block is found.
-                        if (Params().MineBlocksOnDemand())
-                            throw boost::thread_interrupted();
-
-                        break;
-                    }
-                }
+                if (ScanLoop(pblock, pindexPrev, pwallet, reservekey))
+                    break;
 
                 // Check for stop or if block needs to be rebuilt
                 boost::this_thread::interruption_point();
                 // Regtest mode doesn't require peers
                 if (vNodes.empty() && Params().MiningRequiresPeers())
                     break;
-                if (nNonce >= 0xffff0000)
+                if (pblock->nNonce >= 0xffff0000)
                     break;
                 if (mempool.GetTransactionsUpdated() != nTransactionsUpdatedLast && GetTime() - nStart > 60)
                     break;
                 if (pindexPrev != chainActive.Tip())
                     break;
 
-                // Update nTime every few seconds
-                UpdateTime(pblock, pindexPrev);
-                if (Params().AllowMinDifficultyBlocks())
-                {
-                    // Changing pblock->nTime can change work required on testnet:
-                    hashTarget.SetCompact(pblock->nBits);
-                }
             }
         }
     }
diff --git a/src/miner.h b/src/miner.h
index 5d5c9c86c7..00ad299512 100644
--- a/src/miner.h
+++ b/src/miner.h
@@ -24,9 +24,11 @@ struct CBlockTemplate
 
 /** Run the miner threads */
 void GenerateBitcoins(bool fGenerate, CWallet* pwallet, int nThreads);
+/** Create a single block */
+bool MineBlock(CWallet *pwallet, uint256& hash);
 /** Generate a new block, without valid proof-of-work */
-CBlockTemplate* CreateNewBlock(const CScript& scriptPubKeyIn);
-CBlockTemplate* CreateNewBlockWithKey(CReserveKey& reservekey);
+CBlockTemplate* CreateNewBlock(const CScript& scriptPubKeyIn, CBlockIndex*& pindexPrev);
+CBlockTemplate* CreateNewBlockWithKey(CReserveKey& reservekey, CBlockIndex*& pindexPrev);
 /** Modify the extranonce in a block */
 void IncrementExtraNonce(CBlock* pblock, CBlockIndex* pindexPrev, unsigned int& nExtraNonce);
 void UpdateTime(CBlockHeader* block, const CBlockIndex* pindexPrev);
diff --git a/src/rpcclient.cpp b/src/rpcclient.cpp
index a45ea9839b..428e1049dc 100644
--- a/src/rpcclient.cpp
+++ b/src/rpcclient.cpp
@@ -29,6 +29,7 @@ static const CRPCConvertParam vRPCConvertParams[] =
     { "getaddednodeinfo", 0 },
     { "setgenerate", 0 },
     { "setgenerate", 1 },
+    { "generate", 0 },
     { "getnetworkhashps", 0 },
     { "getnetworkhashps", 1 },
     { "sendtoaddress", 1 },
diff --git a/src/rpcmining.cpp b/src/rpcmining.cpp
index fcba7e222d..6f165028d5 100644
--- a/src/rpcmining.cpp
+++ b/src/rpcmining.cpp
@@ -113,6 +113,45 @@ Value getgenerate(const Array& params, bool fHelp)
     return GetBoolArg("-gen", false);
 }
 
+Value generate(const Array& params, bool fHelp)
+{
+    if (fHelp || params.size() < 1 || params.size() > 1)
+        throw runtime_error(
+            "generate numblocks\n"
+            "\nMine blocks immediately (before the RPC call returns)\n"
+            "1. numblocks    (numeric) How many blocks are generated immediately.\n"
+            "\nResult\n"
+            "[ blockhashes ]     (array) hashes of blocks generated\n"
+            "\nExamples:\n"
+            "\nGenerate 11 blocks\n"
+            + HelpExampleCli("generate", "11")
+        );
+
+    if (pwalletMain == NULL)
+        throw JSONRPCError(RPC_METHOD_NOT_FOUND, "Method not found (disabled)");
+
+    int nHeightStart = 0;
+    int nHeightEnd = 0;
+    int nHeight = 0;
+    int nGenerate = params[0].get_int();
+
+    {   // Don't keep cs_main locked
+        LOCK(cs_main);
+        nHeightStart = chainActive.Height();
+        nHeight = nHeightStart;
+        nHeightEnd = nHeightStart+nGenerate;
+    }
+    Array blockHashes;
+    while (nHeight < nHeightEnd) {
+        uint256 hash;
+        if (!MineBlock(pwalletMain, hash))
+            throw JSONRPCError(RPC_INTERNAL_ERROR, "Wallet keypool empty");
+
+        ++nHeight;
+        blockHashes.push_back(hash.GetHex());
+    }
+    return blockHashes;
+}
 
 Value setgenerate(const Array& params, bool fHelp)
 {
@@ -125,9 +164,6 @@ Value setgenerate(const Array& params, bool fHelp)
             "\nArguments:\n"
             "1. generate         (boolean, required) Set to true to turn on generation, off to turn off.\n"
             "2. genproclimit     (numeric, optional) Set the processor limit for when generation is on. Can be -1 for unlimited.\n"
-            "                    Note: in -regtest mode, genproclimit controls how many blocks are generated immediately.\n"
-            "\nResult\n"
-            "[ blockhashes ]     (array, -regtest only) hashes of blocks generated\n"
             "\nExamples:\n"
             "\nSet the generation on with a limit of one processor\n"
             + HelpExampleCli("setgenerate", "true 1") +
@@ -154,52 +190,9 @@ Value setgenerate(const Array& params, bool fHelp)
             fGenerate = false;
     }
 
-    // -regtest mode: don't return until nGenProcLimit blocks are generated
-    if (fGenerate && Params().MineBlocksOnDemand())
-    {
-        int nHeightStart = 0;
-        int nHeightEnd = 0;
-        int nHeight = 0;
-        int nGenerate = (nGenProcLimit > 0 ? nGenProcLimit : 1);
-        CReserveKey reservekey(pwalletMain);
-
-        {   // Don't keep cs_main locked
-            LOCK(cs_main);
-            nHeightStart = chainActive.Height();
-            nHeight = nHeightStart;
-            nHeightEnd = nHeightStart+nGenerate;
-        }
-        unsigned int nExtraNonce = 0;
-        Array blockHashes;
-        while (nHeight < nHeightEnd)
-        {
-            auto_ptr<CBlockTemplate> pblocktemplate(CreateNewBlockWithKey(reservekey));
-            if (!pblocktemplate.get())
-                throw JSONRPCError(RPC_INTERNAL_ERROR, "Wallet keypool empty");
-            CBlock *pblock = &pblocktemplate->block;
-            {
-                LOCK(cs_main);
-                IncrementExtraNonce(pblock, chainActive.Tip(), nExtraNonce);
-            }
-            while (!CheckProofOfWork(pblock->GetHash(), pblock->nBits, Params().GetConsensus())) {
-                // Yes, there is a chance every nonce could fail to satisfy the -regtest
-                // target -- 1 in 2^(2^32). That ain't gonna happen.
-                ++pblock->nNonce;
-            }
-            CValidationState state;
-            if (!ProcessNewBlock(state, NULL, pblock))
-                throw JSONRPCError(RPC_INTERNAL_ERROR, "ProcessNewBlock, block not accepted");
-            ++nHeight;
-            blockHashes.push_back(pblock->GetHash().GetHex());
-        }
-        return blockHashes;
-    }
-    else // Not -regtest: start generate thread, return immediately
-    {
-        mapArgs["-gen"] = (fGenerate ? "1" : "0");
-        mapArgs ["-genproclimit"] = itostr(nGenProcLimit);
-        GenerateBitcoins(fGenerate, pwalletMain, nGenProcLimit);
-    }
+    mapArgs["-gen"] = (fGenerate ? "1" : "0");
+    mapArgs ["-genproclimit"] = itostr(nGenProcLimit);
+    GenerateBitcoins(fGenerate, pwalletMain, nGenProcLimit);
 
     return Value::null;
 }
@@ -482,7 +475,7 @@ Value getblocktemplate(const Array& params, bool fHelp)
 
         // Store the pindexBest used before CreateNewBlock, to avoid races
         nTransactionsUpdatedLast = mempool.GetTransactionsUpdated();
-        CBlockIndex* pindexPrevNew = chainActive.Tip();
+        CBlockIndex* pindexPrevNew;
         nStart = GetTime();
 
         // Create new block
@@ -492,7 +485,7 @@ Value getblocktemplate(const Array& params, bool fHelp)
             pblocktemplate = NULL;
         }
         CScript scriptDummy = CScript() << OP_TRUE;
-        pblocktemplate = CreateNewBlock(scriptDummy);
+        pblocktemplate = CreateNewBlock(scriptDummy, pindexPrevNew);
         if (!pblocktemplate)
             throw JSONRPCError(RPC_OUT_OF_MEMORY, "Out of memory");
 
diff --git a/src/rpcserver.cpp b/src/rpcserver.cpp
index d30fa32eb4..0fd7769a19 100644
--- a/src/rpcserver.cpp
+++ b/src/rpcserver.cpp
@@ -312,6 +312,7 @@ static const CRPCCommand vRPCCommands[] =
     /* Coin generation */
     { "generating",         "getgenerate",            &getgenerate,            true,      false },
     { "generating",         "setgenerate",            &setgenerate,            true,      false },
+    { "generating",         "generate",               &generate,               true,      false },
 #endif
 
     /* Raw transactions */
diff --git a/src/rpcserver.h b/src/rpcserver.h
index 7011d41fc1..e7aaed8bdf 100644
--- a/src/rpcserver.h
+++ b/src/rpcserver.h
@@ -162,6 +162,7 @@ extern json_spirit::Value importwallet(const json_spirit::Array& params, bool fH
 
 extern json_spirit::Value getgenerate(const json_spirit::Array& params, bool fHelp); // in rpcmining.cpp
 extern json_spirit::Value setgenerate(const json_spirit::Array& params, bool fHelp);
+extern json_spirit::Value generate(const json_spirit::Array& params, bool fHelp);
 extern json_spirit::Value getnetworkhashps(const json_spirit::Array& params, bool fHelp);
 extern json_spirit::Value getmininginfo(const json_spirit::Array& params, bool fHelp);
 extern json_spirit::Value prioritisetransaction(const json_spirit::Array& params, bool fHelp);
diff --git a/src/test/miner_tests.cpp b/src/test/miner_tests.cpp
index 6ab9cb8a44..27c0a08de9 100644
--- a/src/test/miner_tests.cpp
+++ b/src/test/miner_tests.cpp
@@ -62,7 +62,8 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
     Checkpoints::fEnabled = false;
 
     // Simple block creation, nothing special yet:
-    BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey));
+    CBlockIndex* pindexPrev;
+    BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey, pindexPrev));
 
     // We can't make transactions until we have inputs
     // Therefore, load 100 blocks :)
@@ -90,7 +91,7 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
     delete pblocktemplate;
 
     // Just to make sure we can still make simple blocks
-    BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey));
+    BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey, pindexPrev));
     delete pblocktemplate;
 
     // block sigops > limit: 1000 CHECKMULTISIG + 1
@@ -108,7 +109,7 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
         mempool.addUnchecked(hash, CTxMemPoolEntry(tx, 11, GetTime(), 111.0, 11));
         tx.vin[0].prevout.hash = hash;
     }
-    BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey));
+    BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey, pindexPrev));
     delete pblocktemplate;
     mempool.clear();
 
@@ -128,14 +129,14 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
         mempool.addUnchecked(hash, CTxMemPoolEntry(tx, 11, GetTime(), 111.0, 11));
         tx.vin[0].prevout.hash = hash;
     }
-    BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey));
+    BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey, pindexPrev));
     delete pblocktemplate;
     mempool.clear();
 
     // orphan in mempool
     hash = tx.GetHash();
     mempool.addUnchecked(hash, CTxMemPoolEntry(tx, 11, GetTime(), 111.0, 11));
-    BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey));
+    BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey, pindexPrev));
     delete pblocktemplate;
     mempool.clear();
 
@@ -153,7 +154,7 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
     tx.vout[0].nValue = 5900000000LL;
     hash = tx.GetHash();
     mempool.addUnchecked(hash, CTxMemPoolEntry(tx, 11, GetTime(), 111.0, 11));
-    BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey));
+    BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey, pindexPrev));
     delete pblocktemplate;
     mempool.clear();
 
@@ -164,7 +165,7 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
     tx.vout[0].nValue = 0;
     hash = tx.GetHash();
     mempool.addUnchecked(hash, CTxMemPoolEntry(tx, 11, GetTime(), 111.0, 11));
-    BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey));
+    BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey, pindexPrev));
     delete pblocktemplate;
     mempool.clear();
 
@@ -182,7 +183,7 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
     tx.vout[0].nValue -= 1000000;
     hash = tx.GetHash();
     mempool.addUnchecked(hash, CTxMemPoolEntry(tx, 11, GetTime(), 111.0, 11));
-    BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey));
+    BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey, pindexPrev));
     delete pblocktemplate;
     mempool.clear();
 
@@ -196,17 +197,17 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
     tx.vout[0].scriptPubKey = CScript() << OP_2;
     hash = tx.GetHash();
     mempool.addUnchecked(hash, CTxMemPoolEntry(tx, 11, GetTime(), 111.0, 11));
-    BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey));
+    BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey, pindexPrev));
     delete pblocktemplate;
     mempool.clear();
 
     // subsidy changing
     int nHeight = chainActive.Height();
     chainActive.Tip()->nHeight = 209999;
-    BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey));
+    BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey, pindexPrev));
     delete pblocktemplate;
     chainActive.Tip()->nHeight = 210000;
-    BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey));
+    BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey, pindexPrev));
     delete pblocktemplate;
     chainActive.Tip()->nHeight = nHeight;
 
@@ -238,7 +239,7 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
     mempool.addUnchecked(hash, CTxMemPoolEntry(tx2, 11, GetTime(), 111.0, 11));
     BOOST_CHECK(!IsFinalTx(tx2));
 
-    BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey));
+    BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey, pindexPrev));
 
     // Neither tx should have make it into the template.
     BOOST_CHECK_EQUAL(pblocktemplate->block.vtx.size(), 1);
@@ -251,7 +252,7 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
     BOOST_CHECK(IsFinalTx(tx, chainActive.Tip()->nHeight + 1));
     BOOST_CHECK(IsFinalTx(tx2));
 
-    BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey));
+    BOOST_CHECK(pblocktemplate = CreateNewBlock(scriptPubKey, pindexPrev));
     BOOST_CHECK_EQUAL(pblocktemplate->block.vtx.size(), 3);
     delete pblocktemplate;