miner.cpp

// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2014 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include "miner.h"

#include "amount.h"
#include "primitives/block.h"
#include "primitives/transaction.h"
#include "hash.h"
#include "main.h"
#include "masternode-sync.h"
#include "net.h"
#include "pow.h"
#include "timedata.h"
#include "util.h"
#include "utilmoneystr.h"
#ifdef ENABLE_WALLET
#include "wallet.h"
#endif
#include "masternode-payments.h"

#include <boost/thread.hpp>
#include <boost/tuple/tuple.hpp>

using namespace std;

//////////////////////////////////////////////////////////////////////////////
//
// BitcoinMiner
//

//
// Unconfirmed transactions in the memory pool often depend on other
// transactions in the memory pool. When we select transactions from the
// pool, we select by highest priority or fee rate, so we might consider
// transactions that depend on transactions that aren't yet in the block.
// The COrphan class keeps track of these 'temporary orphans' while
// CreateBlock is figuring out which transactions to include.
//
class COrphan
{
public:
    const CTransaction* ptx;
    set<uint256> setDependsOn;
    CFeeRate feeRate;
    double dPriority;

    COrphan(const CTransaction* ptxIn) : ptx(ptxIn), feeRate(0), dPriority(0)
    {
    }
};

uint64_t nLastBlockTx = 0;
uint64_t nLastBlockSize = 0;
int64_t nLastCoinStakeSearchInterval = 0;

// We want to sort transactions by priority and fee rate, so:
typedef boost::tuple<double, CFeeRate, const CTransaction*> TxPriority;
class TxPriorityCompare
{
    bool byFee;

public:
    TxPriorityCompare(bool _byFee) : byFee(_byFee) { }

    bool operator()(const TxPriority& a, const TxPriority& b)
    {
        if (byFee)
        {
            if (a.get<1>() == b.get<1>())
                return a.get<0>() < b.get<0>();
            return a.get<1>() < b.get<1>();
        }
        else
        {
            if (a.get<0>() == b.get<0>())
                return a.get<1>() < b.get<1>();
            return a.get<0>() < b.get<0>();
        }
    }
};

void UpdateTime(CBlockHeader* pblock, const CBlockIndex* pindexPrev, bool fProofOfStake)
{
    pblock->nTime = std::max(pindexPrev->GetMedianTimePast()+1, GetAdjustedTime());

    // Updating time can change work required on testnet:
        if (Params().AllowMinDifficultyBlocks())    
            pblock->nBits = fProofOfStake ? GetNextPoSTargetRequired(pindexPrev) :  GetNextWorkRequired(pindexPrev, pblock);
}

class TestBlockError: public std::runtime_error
{
  public:
  TestBlockError(const char* m) : std::runtime_error(m) { }
};

CBlockTemplate* CreateNewBlock(const CScript& scriptPubKeyIn, CWallet* pwallet, bool fProofOfStake)
{
    // Create new block
    auto_ptr<CBlockTemplate> pblocktemplate(new CBlockTemplate());
    if(!pblocktemplate.get())
        return NULL;
    CBlock *pblock = &pblocktemplate->block; // pointer for convenience

    // -regtest only: allow overriding block.nVersion with
    // -blockversion=N to test forking scenarios
    if (Params().MineBlocksOnDemand())
        pblock->nVersion = GetArg("-blockversion", pblock->nVersion);

    CBlockIndex* pindexPrev = chainActive.Tip();
    const int nHeight = pindexPrev->nHeight + 1;
    // Create coinbase tx
    CMutableTransaction txNew;
    txNew.vin.resize(1);
    txNew.vin[0].prevout.SetNull();
    txNew.vin[0].scriptSig = CScript() << nHeight << OP_0;
    txNew.vout.resize(1);
    txNew.vout[0].scriptPubKey = scriptPubKeyIn;

    // Add dummy coinbase tx as first transaction
    pblock->vtx.push_back(txNew);
    pblocktemplate->vTxFees.push_back(-1); // updated at end
    pblocktemplate->vTxSigOps.push_back(-1); // updated at end

    // ppcoin: if coinstake available add coinstake tx
    static int64_t nLastCoinStakeSearchTime = GetAdjustedTime(); // only initialized at startup
    unsigned int nTxNewTime = 0;

    if (fProofOfStake) {
        boost::this_thread::interruption_point();
        pblock->nTime = GetAdjustedTime();
        pblock->nBits = GetNextPoSTargetRequired(pindexPrev);
        CMutableTransaction txCoinStake;
        int64_t nSearchTime = pblock->nTime; // search to current time
        bool fStakeFound = false;
        if (nSearchTime >= nLastCoinStakeSearchTime) {
            if (pwallet->CreateCoinStake(*pwallet, pblock->nBits, nSearchTime - nLastCoinStakeSearchTime, txCoinStake, nTxNewTime)) {
                pblock->nTime = nTxNewTime;
                pblock->vtx[0].vout[0].SetEmpty();
                pblock->vtx.push_back(CTransaction(txCoinStake));
                fStakeFound = true;
            }
            nLastCoinStakeSearchInterval = nSearchTime - nLastCoinStakeSearchTime;
            nLastCoinStakeSearchTime = nSearchTime;
        }

        if (!fStakeFound)
            return NULL;
    }

    // Largest block you're willing to create:
    unsigned int nBlockMaxSize = GetArg("-blockmaxsize", DEFAULT_BLOCK_MAX_SIZE);
    // Limit to betweeen 1K and MAX_BLOCK_SIZE-1K for sanity:
    nBlockMaxSize = std::max((unsigned int)1000, std::min((unsigned int)(MAX_BLOCK_SIZE-1000), nBlockMaxSize));

    // How much of the block should be dedicated to high-priority transactions,
    // included regardless of the fees they pay
    unsigned int nBlockPrioritySize = GetArg("-blockprioritysize", DEFAULT_BLOCK_PRIORITY_SIZE);
    nBlockPrioritySize = std::min(nBlockMaxSize, nBlockPrioritySize);

    // Minimum block size you want to create; block will be filled with free transactions
    // until there are no more or the block reaches this size:
    unsigned int nBlockMinSize = GetArg("-blockminsize", DEFAULT_BLOCK_MIN_SIZE);
    nBlockMinSize = std::min(nBlockMaxSize, nBlockMinSize);

    // Collect memory pool transactions into the block
    CAmount nFees = 0;

    {
        LOCK2(cs_main, mempool.cs);
        CBlockIndex* pindexPrev = chainActive.Tip();
        CCoinsViewCache view(pcoinsTip);

        // Priority order to process transactions
        list<COrphan> vOrphan; // list memory doesn't move
        map<uint256, vector<COrphan*> > mapDependers;
        bool fPrintPriority = GetBoolArg("-printpriority", false);

        // This vector will be sorted into a priority queue:
        vector<TxPriority> vecPriority;
        vecPriority.reserve(mempool.mapTx.size());
        for (map<uint256, CTxMemPoolEntry>::iterator mi = mempool.mapTx.begin();
             mi != mempool.mapTx.end(); ++mi)
        {
            const CTransaction& tx = mi->second.GetTx();
            if (tx.IsCoinBase() || tx.IsCoinStake() || !IsFinalTx(tx, nHeight))
                continue;

            COrphan* porphan = NULL;
            double dPriority = 0;
            CAmount nTotalIn = 0;
            bool fMissingInputs = false;
            BOOST_FOREACH(const CTxIn& txin, tx.vin)
            {
                // Read prev transaction
                if (!view.HaveCoins(txin.prevout.hash))
                {
                    // This should never happen; all transactions in the memory
                    // pool should connect to either transactions in the chain
                    // or other transactions in the memory pool.
                    if (!mempool.mapTx.count(txin.prevout.hash))
                    {
                        LogPrintf("ERROR: mempool transaction missing input\n");
                        if (fDebug) assert("mempool transaction missing input" == 0);
                        fMissingInputs = true;
                        if (porphan)
                            vOrphan.pop_back();
                        break;
                    }

                    // Has to wait for dependencies
                    if (!porphan)
                    {
                        // Use list for automatic deletion
                        vOrphan.push_back(COrphan(&tx));
                        porphan = &vOrphan.back();
                    }
                    mapDependers[txin.prevout.hash].push_back(porphan);
                    porphan->setDependsOn.insert(txin.prevout.hash);
                    nTotalIn += mempool.mapTx[txin.prevout.hash].GetTx().vout[txin.prevout.n].nValue;
                    continue;
                }
                const CCoins* coins = view.AccessCoins(txin.prevout.hash);
                assert(coins);

                CAmount nValueIn = coins->vout[txin.prevout.n].nValue;
                nTotalIn += nValueIn;

                int nConf = nHeight - coins->nHeight;

                dPriority += (double)nValueIn * nConf;
            }
            if (fMissingInputs) continue;

            // Priority is sum(valuein * age) / modified_txsize
            unsigned int nTxSize = ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
            dPriority = tx.ComputePriority(dPriority, nTxSize);

            uint256 hash = tx.GetHash();
            mempool.ApplyDeltas(hash, dPriority, nTotalIn);

            CFeeRate feeRate(nTotalIn-tx.GetValueOut(), nTxSize);

            if (porphan)
            {
                porphan->dPriority = dPriority;
                porphan->feeRate = feeRate;
            }
            else
                vecPriority.push_back(TxPriority(dPriority, feeRate, &mi->second.GetTx()));
        }

        // Collect transactions into block
        uint64_t nBlockSize = 1000;
        uint64_t nBlockTx = 0;
        int nBlockSigOps = 100;
        bool fSortedByFee = (nBlockPrioritySize <= 0);

        TxPriorityCompare comparer(fSortedByFee);
        std::make_heap(vecPriority.begin(), vecPriority.end(), comparer);

        while (!vecPriority.empty())
        {
            // Take highest priority transaction off the priority queue:
            double dPriority = vecPriority.front().get<0>();
            CFeeRate feeRate = vecPriority.front().get<1>();
            const CTransaction& tx = *(vecPriority.front().get<2>());

            std::pop_heap(vecPriority.begin(), vecPriority.end(), comparer);
            vecPriority.pop_back();

            // Size limits
            unsigned int nTxSize = ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
            if (nBlockSize + nTxSize >= nBlockMaxSize)
                continue;

            // Legacy limits on sigOps:
            unsigned int nTxSigOps = GetLegacySigOpCount(tx);
            if (nBlockSigOps + nTxSigOps >= MAX_BLOCK_SIGOPS)
                continue;

            // Skip free transactions if we're past the minimum block size:
            const uint256& hash = tx.GetHash();
            double dPriorityDelta = 0;
            CAmount nFeeDelta = 0;
            mempool.ApplyDeltas(hash, dPriorityDelta, nFeeDelta);
            if (fSortedByFee && (dPriorityDelta <= 0) && (nFeeDelta <= 0) && (feeRate < ::minRelayTxFee) && (nBlockSize + nTxSize >= nBlockMinSize))
                continue;

            // Prioritise by fee once past the priority size or we run out of high-priority
            // transactions:
            if (!fSortedByFee &&
                ((nBlockSize + nTxSize >= nBlockPrioritySize) || !AllowFree(dPriority)))
            {
                fSortedByFee = true;
                comparer = TxPriorityCompare(fSortedByFee);
                std::make_heap(vecPriority.begin(), vecPriority.end(), comparer);
            }

            if (!view.HaveInputs(tx))
                continue;

            CAmount nTxFees = view.GetValueIn(tx)-tx.GetValueOut();

            nTxSigOps += GetP2SHSigOpCount(tx, view);
            if (nBlockSigOps + nTxSigOps >= MAX_BLOCK_SIGOPS)
                continue;

            // Note that flags: we don't want to set mempool/IsStandard()
            // policy here, but we still have to ensure that the block we
            // create only contains transactions that are valid in new blocks.
            CValidationState state;
            if (!CheckInputs(tx, state, view, true, MANDATORY_SCRIPT_VERIFY_FLAGS, true))
                continue;

            CTxUndo txundo;
            UpdateCoins(tx, state, view, txundo, nHeight);

            // Added
            pblock->vtx.push_back(tx);
            pblocktemplate->vTxFees.push_back(nTxFees);
            pblocktemplate->vTxSigOps.push_back(nTxSigOps);
            nBlockSize += nTxSize;
            ++nBlockTx;
            nBlockSigOps += nTxSigOps;
            nFees += nTxFees;

            if (fPrintPriority)
            {
                LogPrintf("priority %.1f fee %s txid %s\n",
                    dPriority, feeRate.ToString(), tx.GetHash().ToString());
            }

            // Add transactions that depend on this one to the priority queue
            if (mapDependers.count(hash))
            {
                BOOST_FOREACH(COrphan* porphan, mapDependers[hash])
                {
                    if (!porphan->setDependsOn.empty())
                    {
                        porphan->setDependsOn.erase(hash);
                        if (porphan->setDependsOn.empty())
                        {
                            vecPriority.push_back(TxPriority(porphan->dPriority, porphan->feeRate, porphan->ptx));
                            std::push_heap(vecPriority.begin(), vecPriority.end(), comparer);
                        }
                    }
            }
            }
        }
        bool fMasterPayment = false;
        /*
         * Masternode code PoS doesn't pay for Masternode
         */
        if (!fProofOfStake && chainActive.Tip()->nHeight >= Params().FirstMasternodePaymentBlock() - 1 ) {
            //Masternode and general terasury payments
            fMasterPayment = FillBlockPayee(txNew, nFees, fProofOfStake, nTxNewTime);

            //Make payee
            if (txNew.vout.size() > 1) {
                pblock->payee = txNew.vout[1].scriptPubKey;
            }
        }


        nLastBlockTx = nBlockTx;
        nLastBlockSize = nBlockSize;
        LogPrintf("CreateNewBlock(): total size %u\n", nBlockSize); 

        if (!fProofOfStake) {
            int nHeight = chainActive.Tip()->nHeight + 1;
            if ( nHeight < Params().FirstMasternodePaymentBlock() || !fMasterPayment)
            {   
                // Compute final coinbase transaction.
                txNew.vout[0].nValue = GetBlockValue(nHeight) + nFees;
            }
            pblock->vtx[0] = txNew;
            pblocktemplate->vTxFees[0] = -nFees;
        }

        // Fill in header
        pblock->hashPrevBlock  = pindexPrev->GetBlockHash();
        if (!fProofOfStake)
            UpdateTime(pblock, pindexPrev, fProofOfStake);
        pblock->nBits          = fProofOfStake ? GetNextPoSTargetRequired(pindexPrev) : GetNextWorkRequired(pindexPrev, pblock);
        pblock->nNonce         = 0;
        pblocktemplate->vTxSigOps[0] = GetLegacySigOpCount(pblock->vtx[0]);

        CValidationState state;
        if (!TestBlockValidity(state, *pblock, pindexPrev, false, false))
            throw TestBlockError("CreateNewBlock() : TestBlockValidity failed");
    }

    return pblocktemplate.release();
}

void IncrementExtraNonce(CBlock* pblock, CBlockIndex* pindexPrev, unsigned int& nExtraNonce)
{
    // Update nExtraNonce
    static uint256 hashPrevBlock;
    if (hashPrevBlock != pblock->hashPrevBlock)
    {
        nExtraNonce = 0;
        hashPrevBlock = pblock->hashPrevBlock;
    }
    ++nExtraNonce;
    unsigned int nHeight = pindexPrev->nHeight+1; // Height first in coinbase required for block.version=2
    CMutableTransaction txCoinbase(pblock->vtx[0]);
    txCoinbase.vin[0].scriptSig = (CScript() << nHeight << CScriptNum(nExtraNonce)) + COINBASE_FLAGS;
    assert(txCoinbase.vin[0].scriptSig.size() <= 100);

    pblock->vtx[0] = txCoinbase;
    pblock->hashMerkleRoot = pblock->BuildMerkleTree();
}

#ifdef ENABLE_WALLET
//////////////////////////////////////////////////////////////////////////////
//
// Internal miner
//
double dHashesPerSec = 0.0;
int64_t nHPSTimerStart = 0;

CBlockTemplate* CreateNewBlockWithKey(CReserveKey& reservekey, CWallet* pwallet, bool fProofOfStake)
{
    CPubKey pubkey;
    if (!reservekey.GetReservedKey(pubkey))
        return NULL;

    CScript scriptPubKey = CScript() << ToByteVector(pubkey) << OP_CHECKSIG;
    return CreateNewBlock(scriptPubKey, pwallet, fProofOfStake);
}

bool ProcessBlockFound(CBlock* pblock, CWallet& wallet, CReserveKey& reservekey)
{
    LogPrintf("%s\n", pblock->ToString());
    LogPrintf("generated %s\n", FormatMoney(pblock->vtx[0].vout[0].nValue));

    // Found a solution
    {
        LOCK(cs_main);
        if (pblock->hashPrevBlock != chainActive.Tip()->GetBlockHash())
            return error("QuarkMiner : generated block is stale");
    }

    // Remove key from key pool
    reservekey.KeepKey();

    // Track how many getdata requests this block gets
    {
        LOCK(wallet.cs_wallet);
        wallet.mapRequestCount[pblock->GetHash()] = 0;
    }

    // Process this block the same as if we had received it from another node
    CValidationState state;
    if (!ProcessNewBlock(state, NULL, pblock))
        return error("QuarkMiner : ProcessNewBlock, block not accepted");

    return true;
}

void BitcoinMiner(CWallet *pwallet, bool fProofOfStake)
{
    LogPrintf("QuarkMiner started\n");
    SetThreadPriority(THREAD_PRIORITY_LOWEST);
    RenameThread("quark-miner");
    MilliSleep(1000);

    // Each thread has its own key and counter
    CReserveKey reservekey(pwallet);
    unsigned int nExtraNonce = 0;

    bool fRetry;
    do {
    fRetry = false;

    //control the amount of times the client will check for mintable coins
    static bool fMintableCoins = false;
    static int nMintableLastCheck = 0;

    if (fProofOfStake && (GetTime() - nMintableLastCheck > 5 * 60)) // 5 minute check time
    {
        nMintableLastCheck = GetTime();
        fMintableCoins = pwallet->MintableCoins();
    }

    try {
        CBlockIndex* pindexPrev = NULL;
        while (true) {
            if (Params().MiningRequiresPeers()) {
                // Busy-wait for the network to come online so we don't waste time mining
                // on an obsolete chain. In regtest mode we expect to fly solo.
                do {
                    bool fvNodesEmpty;
                    {
                        LOCK(cs_vNodes);
                        fvNodesEmpty = vNodes.empty();
                    }
                    if (!fvNodesEmpty && !IsInitialBlockDownload())
                        break;
                    MilliSleep(1000);
                    boost::this_thread::interruption_point();
                } while (true);

                // wait for download to complete
                do
                {
                    {
                        LOCK(cs_main);
                        CBlockIndex* tip = chainActive.Tip();
                        if (pindexPrev == tip)
                            break;
                        pindexPrev = tip;
                    }
                    MilliSleep(2000);
                    boost::this_thread::interruption_point();
                } while (true);
            }

            if (fProofOfStake) {
                if (chainActive.Tip()->nHeight < Params().FIRST_POS_BLOCK()) {
                    MilliSleep(5000);
                    continue;
                }

                while (vNodes.empty() || pwallet->IsLocked() || !fMintableCoins || nReserveBalance >= pwallet->GetBalance() /*||
                (!masternodeSync.IsSynced() && chainActive.Tip()->nHeight >= Params().FirstMasternodePaymentBlock())*/) {
                    nLastCoinStakeSearchInterval = 0;
                    MilliSleep(5000);
                    if (!fProofOfStake)
                        continue;
                }

                if (mapHashedBlocks.count(chainActive.Tip()->nHeight)) //search our map of hashed blocks, see if bestblock has been hashed yet
                {
                    if (GetTime() - mapHashedBlocks[chainActive.Tip()->nHeight] < max(pwallet->nHashInterval, (unsigned int)1)) // wait half of the nHashDrift with max wait of 3 minutes
                    {
                        MilliSleep(5000);
                        continue;
                    }
                }
            }

            //
            // Create new block
            //
            unsigned int nTransactionsUpdatedLast;
            {
                LOCK(cs_main);
                nTransactionsUpdatedLast = mempool.GetTransactionsUpdated();
                pindexPrev = chainActive.Tip();
            }

            if (!pindexPrev)
                continue;

            auto_ptr<CBlockTemplate> pblocktemplate(CreateNewBlockWithKey(reservekey, pwallet, fProofOfStake));
            if (!pblocktemplate.get())
            {
                // Refill keypool
                if (!pwallet->IsLocked()) {
                    if (!pwallet->TopUpKeyPool()) {
                        LogPrintf("Error in QuarkMiner: Keypool ran out, please call keypoolrefill before restarting the mining thread\n");
                        return;
                    }
                }
                continue;
            }

            CBlock *pblock = &pblocktemplate->block;
            IncrementExtraNonce(pblock, pindexPrev, nExtraNonce);

                    //Stake miner main
            if (fProofOfStake) {
                LogPrintf("CPUMiner : proof-of-stake block found %s \n", pblock->GetHash().ToString().c_str());

                if (!pblock->SignBlock(*pwallet)) {
                    LogPrintf("BitcoinMiner(): Signing new block failed \n");
                    continue;
                }

                LogPrintf("CPUMiner : proof-of-stake block was signed %s \n", pblock->GetHash().ToString().c_str());
                SetThreadPriority(THREAD_PRIORITY_NORMAL);
                ProcessBlockFound(pblock, *pwallet, reservekey);
                SetThreadPriority(THREAD_PRIORITY_LOWEST);

                continue;
            }


            LogPrintf("Running QuarkMiner with %u transactions in block (%u bytes)\n", pblock->vtx.size(),
                ::GetSerializeSize(*pblock, SER_NETWORK, PROTOCOL_VERSION));

            //
            // Search
            //
            int64_t nStart = GetTime();
            uint256 hashTarget = uint256().SetCompact(pblock->nBits);
            uint256 hash;
            while (true)
            {
                // scan for solution
                bool fFound = false;
                int nHashesDone = 0;
                for (int ite = 0; ite < 8192; ite++)
                {
                    nHashesDone++;
                    pblock->nNonce++;
                    hash = pblock->GetHash();
                    fFound = (hash <= hashTarget);
                    if (fFound)
                        break;
                }

                // Check if something found
                if (fFound)
                {
                    // Found a solution
                    assert(hash == pblock->GetHash());

                    SetThreadPriority(THREAD_PRIORITY_NORMAL);
                    LogPrintf("QuarkMiner:\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;
                }

                // Meter hashes/sec
                static int64_t nHashCounter;
                if (nHPSTimerStart == 0)
                {
                    nHPSTimerStart = GetTimeMillis();
                    nHashCounter = 0;
                }
                else
                    nHashCounter += nHashesDone;
                if (GetTimeMillis() - nHPSTimerStart > 4000)
                {
                    static CCriticalSection cs;
                    {
                        LOCK(cs);
                        if (GetTimeMillis() - nHPSTimerStart > 4000)
                        {
                            dHashesPerSec = 1000.0 * nHashCounter / (GetTimeMillis() - nHPSTimerStart);
                            nHPSTimerStart = GetTimeMillis();
                            nHashCounter = 0;
                            static int64_t nLogTime;
                            if (GetTime() - nLogTime > 30 * 60)
                            {
                                nLogTime = GetTime();
                                LogPrintf("hashmeter %6.0f khash/s\n", dHashesPerSec/1000.0);
                            }
                        }
                    }
                }

                // Check for stop or if block needs to be rebuilt
                boost::this_thread::interruption_point();
                // Regtest mode doesn't require peers
                bool nodeemp;
                {
                    LOCK(cs_vNodes);
                    nodeemp = vNodes.empty();
                }
                if (nodeemp && Params().MiningRequiresPeers())
                    break;
                if (pblock->nNonce >= 0xffff0000)
                    break;
                {
                    LOCK(cs_main);
                    if (mempool.GetTransactionsUpdated() != nTransactionsUpdatedLast && GetTime() - nStart > 60)
                        break;
                    if (pindexPrev != chainActive.Tip())
                        break;
                }

                // Update nTime every few seconds
                UpdateTime(pblock, pindexPrev, fProofOfStake);
                if (Params().AllowMinDifficultyBlocks())
                {
                    // Changing pblock->nTime can change work required on testnet:
                    hashTarget.SetCompact(pblock->nBits);
                }
            }
        }
    }
    catch (boost::thread_interrupted)
    {
        LogPrintf("QuarkMiner terminated\n");
        throw;
    }
    catch (const TestBlockError &e)
    {
        LogPrintf("TestBlockError error: %s\n", e.what());
        if (fProofOfStake)
        {
            // possible ERROR: ConnectBlock() : inputs missing/spent
            // PoS may need to recheck available coins as they may have been spent
            fRetry = true;
            MilliSleep(5000);
        }
        else
            return;
    }
    catch (const std::runtime_error &e)
    {
        LogPrintf("QuarkMiner runtime error: %s\n", e.what());
        return;
    }

    } while (fRetry);
}


void static ThreadBitcoinMiner(void* parg)
{
    boost::this_thread::interruption_point();
    CWallet* pwallet = (CWallet*)parg;
    try {
        BitcoinMiner(pwallet, false);
        boost::this_thread::interruption_point();
    } catch (std::exception& e) {
        LogPrintf("ThreadBitcoinMiner() exception");
    } catch (...) {
        LogPrintf("ThreadBitcoinMiner() exception");
    }

    LogPrintf("ThreadBitcoinMiner exiting\n");
}

void GenerateBitcoins(bool fGenerate, CWallet* pwallet, int nThreads)
{
    static boost::thread_group* minerThreads = NULL;

    if (nThreads < 0) {
        // In regtest threads defaults to 1
        if (Params().DefaultMinerThreads())
            nThreads = Params().DefaultMinerThreads();
        else
            nThreads = boost::thread::hardware_concurrency();
    }

    if (minerThreads != NULL)
    {
        minerThreads->interrupt_all();
        delete minerThreads;
        minerThreads = NULL;
    }

    if (nThreads == 0 || !fGenerate)
        return;

    minerThreads = new boost::thread_group();
    for (int i = 0; i < nThreads; i++)
        minerThreads->create_thread(boost::bind(&ThreadBitcoinMiner, pwallet));
}

#endif // ENABLE_WALLET