Function IsInitialBlockDownload

src/main.cpp:1634–1655

bool fForceInitialBlockDownload = false;
bool IsInitialBlockDownload()
{
    if (fForceInitialBlockDownload)
        return false;

    const CChainParams& chainParams = Params();
    LOCK(cs_main);
    if (fImporting || fReindex)
        return true;
    if (fCheckpointsEnabled && chainActive.Height() < Checkpoints::GetTotalBlocksEstimate(chainParams.Checkpoints()))
        return true;
    static bool lockIBDState = false;
    if (lockIBDState)
        return false;
    bool state = (chainActive.Height() < pindexBestHeader->nHeight - 24 * 6 ||
            std::max(chainActive.Tip()->GetBlockTime(), pindexBestHeader->GetBlockTime()) < GetTime() - 24 * 60 * 60);
    if (!state) {
        lockIBDState = true;
        LogPrintf("No longer initial block download\n");
    }
    return state;
}

bool fLargeWorkForkFound = false;
bool fLargeWorkInvalidChainFound = false;