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BlockchainLMDB: extract txn macros used during block add/remove

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warptangent 2016-02-08 04:57:16 -08:00
parent 50197b62a3
commit 15ee0bef4b
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1 changed files with 26 additions and 0 deletions
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26
src/blockchain_db/lmdb/db_lmdb.cpp
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@ -1265,6 +1265,32 @@ void BlockchainLMDB::unlock()
auto_txn.commit(); \
} while(0)
// The below two macros are for DB access within block add/remove, whether
// regular batch txn is in use or not. m_write_txn is used as a batch txn, even
// if it's only within block add/remove.
//
// DB access functions that may be called both within block add/remove and
// without should use these. If the function will be called ONLY within block
// add/remove, m_write_txn alone may be used instead of these macros.
#define TXN_BLOCK_PREFIX(flags); \
mdb_txn_safe auto_txn; \
mdb_txn_safe* txn_ptr = &auto_txn; \
if (m_batch_active || m_write_txn) \
txn_ptr = m_write_txn; \
else \
{ \
if (auto mdb_res = mdb_txn_begin(m_env, NULL, flags, auto_txn)) \
throw0(DB_ERROR(lmdb_error(std::string("Failed to create a transaction for the db in ")+__FUNCTION__+": ", mdb_res).c_str())); \
} \
#define TXN_BLOCK_POSTFIX_SUCCESS() \
do { \
if (! m_batch_active && ! m_write_txn) \
auto_txn.commit(); \
} while(0)
bool BlockchainLMDB::block_exists(const crypto::hash& h) const
{
LOG_PRINT_L3("BlockchainLMDB::" << __func__);