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Don't create readtxn until after txn_safe gate check

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This commit is contained in:
Howard Chu 2018-01-31 18:18:01 +00:00
parent 35d5aa36c9
commit 84a8b2da14
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GPG Key ID: FD2A70B44AB11BA7
2 changed files with 10 additions and 2 deletions
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11
src/blockchain_db/lmdb/db_lmdb.cpp
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@ -338,6 +338,12 @@ mdb_txn_safe::~mdb_txn_safe()
num_active_txns--;
}
void mdb_txn_safe::uncheck()
{
num_active_txns--;
m_check = false;
}
void mdb_txn_safe::commit(std::string message)
{
if (message.size() == 0)
@ -1439,9 +1445,10 @@ void BlockchainLMDB::unlock()
#define TXN_PREFIX_RDONLY() \
MDB_txn *m_txn; \
mdb_txn_cursors *m_cursors; \
mdb_txn_safe auto_txn; \
bool my_rtxn = block_rtxn_start(&m_txn, &m_cursors); \
mdb_txn_safe auto_txn(my_rtxn); \
if (my_rtxn) auto_txn.m_tinfo = m_tinfo.get()
if (my_rtxn) auto_txn.m_tinfo = m_tinfo.get(); \
else auto_txn.uncheck()
#define TXN_POSTFIX_RDONLY()
#define TXN_POSTFIX_SUCCESS() \

1
src/blockchain_db/lmdb/db_lmdb.h
View File

@ -112,6 +112,7 @@ struct mdb_txn_safe
// BlockchainLMDB destructor to call mdb_txn_safe destructor, as that's too late
// to properly abort, since mdb_env_close would have been called earlier.
void abort();
void uncheck();
operator MDB_txn*()
{