Function PruneOrphanBlocks

src/main.cpp:373–397

Remove a random orphan block (which does not have any dependent orphans).

// Remove a random orphan block (which does not have any dependent orphans).
bool static PruneOrphanBlocks(int32_t height) {
    if (mapOrphanBlocksByPrev.size() <= MAX_ORPHAN_BLOCKS) {
        return true;
    }

    COrphanBlock *pOrphanBlock = *setOrphanBlock.rbegin();
    if (pOrphanBlock->height <= height) {
        return false;
    }
    uint256 hash     = pOrphanBlock->blockHash;
    uint256 prevHash = pOrphanBlock->prevBlockHash;
    setOrphanBlock.erase(pOrphanBlock);
    multimap<uint256, COrphanBlock *>::iterator beg = mapOrphanBlocksByPrev.lower_bound(prevHash);
    multimap<uint256, COrphanBlock *>::iterator end = mapOrphanBlocksByPrev.upper_bound(prevHash);
    while (beg != end) {
        if (beg->second->blockHash == hash) {
            mapOrphanBlocksByPrev.erase(beg);
            break;
        }
        ++beg;
    }
    mapOrphanBlocks.erase(hash);
    delete pOrphanBlock;
    return true;
}

bool fLargeWorkForkFound         = false;
bool fLargeWorkInvalidChainFound = false;