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Merge pull request #3940

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f24cbc5 blockchain: fix deadlock with the difficulty cache (moneromooo-monero)
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luigi1111 2018-06-07 12:19:43 -05:00
commit 8a1f0d7d13
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1 changed files with 12 additions and 8 deletions
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20
src/cryptonote_core/blockchain.cpp
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@ -807,16 +807,18 @@ difficulty_type Blockchain::get_difficulty_for_next_block()
{
LOG_PRINT_L3("Blockchain::" << __func__);
CRITICAL_REGION_LOCAL(m_difficulty_lock);
// we can call this without the blockchain lock, it might just give us
// something a bit out of date, but that's fine since anything which
// requires the blockchain lock will have acquired it in the first place,
// and it will be unlocked only when called from the getinfo RPC
crypto::hash top_hash = get_tail_id();
if (top_hash == m_difficulty_for_next_block_top_hash)
return m_difficulty_for_next_block;
{
CRITICAL_REGION_LOCAL(m_difficulty_lock);
// we can call this without the blockchain lock, it might just give us
// something a bit out of date, but that's fine since anything which
// requires the blockchain lock will have acquired it in the first place,
// and it will be unlocked only when called from the getinfo RPC
if (top_hash == m_difficulty_for_next_block_top_hash)
return m_difficulty_for_next_block;
}
CRITICAL_REGION_LOCAL1(m_blockchain_lock);
CRITICAL_REGION_LOCAL(m_blockchain_lock);
std::vector<uint64_t> timestamps;
std::vector<difficulty_type> difficulties;
auto height = m_db->height();
@ -860,6 +862,8 @@ difficulty_type Blockchain::get_difficulty_for_next_block()
}
size_t target = get_difficulty_target();
difficulty_type diff = next_difficulty(timestamps, difficulties, target);
CRITICAL_REGION_LOCAL1(m_difficulty_lock);
m_difficulty_for_next_block_top_hash = top_hash;
m_difficulty_for_next_block = diff;
return diff;