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Fix stale readcursor flags

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Reset thread-specific flags when a write txn is started.
Also remove some redundant start-readtxn code.
This commit is contained in:
Howard Chu 2017-12-28 00:19:30 +00:00
parent 395e209745
commit d52b732efb
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GPG Key ID: FD2A70B44AB11BA7
1 changed files with 15 additions and 22 deletions
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37
src/blockchain_db/lmdb/db_lmdb.cpp
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@ -2623,6 +2623,12 @@ bool BlockchainLMDB::batch_start(uint64_t batch_num_blocks, uint64_t batch_bytes
m_batch_active = true;
memset(&m_wcursors, 0, sizeof(m_wcursors));
if (m_tinfo.get())
{
if (m_tinfo->m_ti_rflags.m_rf_txn)
mdb_txn_reset(m_tinfo->m_ti_rtxn);
memset(&m_tinfo->m_ti_rflags, 0, sizeof(m_tinfo->m_ti_rflags));
}
LOG_PRINT_L3("batch transaction: begin");
return true;
@ -2772,28 +2778,9 @@ void BlockchainLMDB::block_txn_start(bool readonly)
{
if (readonly)
{
bool didit = false;
if (m_write_txn && m_writer == boost::this_thread::get_id())
return;
if (!m_tinfo.get())
{
m_tinfo.reset(new mdb_threadinfo);
memset(&m_tinfo->m_ti_rcursors, 0, sizeof(m_tinfo->m_ti_rcursors));
memset(&m_tinfo->m_ti_rflags, 0, sizeof(m_tinfo->m_ti_rflags));
if (auto mdb_res = lmdb_txn_begin(m_env, NULL, MDB_RDONLY, &m_tinfo->m_ti_rtxn))
throw0(DB_ERROR_TXN_START(lmdb_error("Failed to create a read transaction for the db: ", mdb_res).c_str()));
didit = true;
} else if (!m_tinfo->m_ti_rflags.m_rf_txn)
{
if (auto mdb_res = lmdb_txn_renew(m_tinfo->m_ti_rtxn))
throw0(DB_ERROR_TXN_START(lmdb_error("Failed to renew a read transaction for the db: ", mdb_res).c_str()));
didit = true;
}
if (didit)
{
m_tinfo->m_ti_rflags.m_rf_txn = true;
LOG_PRINT_L3("BlockchainLMDB::" << __func__ << " RO");
}
MDB_txn *mtxn;
mdb_txn_cursors *mcur;
block_rtxn_start(&mtxn, &mcur);
return;
}
@ -2818,6 +2805,12 @@ void BlockchainLMDB::block_txn_start(bool readonly)
throw0(DB_ERROR_TXN_START(lmdb_error("Failed to create a transaction for the db: ", mdb_res).c_str()));
}
memset(&m_wcursors, 0, sizeof(m_wcursors));
if (m_tinfo.get())
{
if (m_tinfo->m_ti_rflags.m_rf_txn)
mdb_txn_reset(m_tinfo->m_ti_rtxn);
memset(&m_tinfo->m_ti_rflags, 0, sizeof(m_tinfo->m_ti_rflags));
}
} else if (m_writer != boost::this_thread::get_id())
throw0(DB_ERROR_TXN_START((std::string("Attempted to start new write txn when batch txn already exists in ")+__FUNCTION__).c_str()));
}