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validation: make CChainState::m_mempool optional

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Since we now have multiple chainstate objects, only one of them is active at any given
time. An active chainstate has a mempool, but there's no point to others having one.

This change will simplify proposed assumeutxo semantics. See the discussion here:
https://github.com/bitcoin/bitcoin/pull/15606#pullrequestreview-692965905

Co-authored-by: Russell Yanofsky <russ@yanofsky.org>
This commit is contained in:
James O'Beirne 2021-07-06 17:05:25 -04:00
parent 088b348dbe
commit 617661703a
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7 changed files with 64 additions and 40 deletions
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src/init.cpp
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@ -1349,7 +1349,7 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
const int64_t load_block_index_start_time = GetTimeMillis();
try {
LOCK(cs_main);
chainman.InitializeChainstate(*Assert(node.mempool));
chainman.InitializeChainstate(Assert(node.mempool.get()));
chainman.m_total_coinstip_cache = nCoinCacheUsage;
chainman.m_total_coinsdb_cache = nCoinDBCache;