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Make FindBlockByHeight constant-time.

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Remove the pnext pointer in CBlockIndex, and replace it with a
vBlockIndexByHeight vector (no effect on memory usage). pnext can
now be replaced by vBlockIndexByHeight[nHeight+1], but
FindBlockByHeight becomes constant-time.

This also means the entire mapBlockIndex structure and the block
index entries in it become purely blocktree-related data, and
independent from the currently active chain, potentially allowing
them to be protected by separate mutexes in the future.
This commit is contained in:
Pieter Wuille
2013-05-12 15:50:22 +02:00
parent 5b5d399593
commit 0fe8010a10
5 changed files with 36 additions and 51 deletions
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5
src/rpcblockchain.cpp
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@@ -65,8 +65,9 @@ Object blockToJSON(const CBlock& block, const CBlockIndex* blockindex)
if (blockindex->pprev)
result.push_back(Pair("previousblockhash", blockindex->pprev->GetBlockHash().GetHex()));
if (blockindex->pnext)
result.push_back(Pair("nextblockhash", blockindex->pnext->GetBlockHash().GetHex()));
CBlockIndex *pnext = blockindex->GetNextInMainChain();
if (pnext)
result.push_back(Pair("nextblockhash", pnext->GetBlockHash().GetHex()));
return result;
}