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Merge pull request #729

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a74348e Add destructor for readtxns (Howard Chu)
This commit is contained in:
Riccardo Spagni 2016-03-16 14:46:17 +02:00
commit 33bdba5cdd
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GPG key ID: 55432DF31CCD4FCD
2 changed files with 21 additions and 10 deletions
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27
src/blockchain_db/lmdb/db_lmdb.cpp
View file

@ -228,17 +228,24 @@ mdb_threadinfo::~mdb_threadinfo()
mdb_txn_abort(m_ti_rtxn);
}
mdb_txn_safe::mdb_txn_safe() : m_txn(NULL)
mdb_txn_safe::mdb_txn_safe(const bool check) : m_txn(NULL), m_tinfo(NULL), m_check(check)
{
while (creation_gate.test_and_set());
num_active_txns++;
creation_gate.clear();
if (check)
{
while (creation_gate.test_and_set());
num_active_txns++;
creation_gate.clear();
}
}
mdb_txn_safe::~mdb_txn_safe()
{
LOG_PRINT_L3("mdb_txn_safe: destructor");
if (m_txn != nullptr)
if (m_tinfo != nullptr)
{
mdb_txn_reset(m_tinfo->m_ti_rtxn);
memset(&m_tinfo->m_ti_rflags, 0, sizeof(m_tinfo->m_ti_rflags));
} else if (m_txn != nullptr)
{
if (m_batch_txn) // this is a batch txn and should have been handled before this point for safety
{
@ -256,7 +263,8 @@ mdb_txn_safe::~mdb_txn_safe()
}
mdb_txn_abort(m_txn);
}
num_active_txns--;
if (m_check)
num_active_txns--;
}
void mdb_txn_safe::commit(std::string message)
@ -1303,9 +1311,10 @@ void BlockchainLMDB::unlock()
#define TXN_PREFIX_RDONLY() \
MDB_txn *m_txn; \
mdb_txn_cursors *m_cursors; \
bool my_rtxn = block_rtxn_start(&m_txn, &m_cursors);
#define TXN_POSTFIX_RDONLY() \
if (my_rtxn) block_rtxn_stop()
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()
#define TXN_POSTFIX_RDONLY()
#define TXN_POSTFIX_SUCCESS() \
do { \

4
src/blockchain_db/lmdb/db_lmdb.h
View file

@ -115,7 +115,7 @@ typedef struct mdb_threadinfo
struct mdb_txn_safe
{
mdb_txn_safe();
mdb_txn_safe(const bool check=true);
~mdb_txn_safe();
void commit(std::string message = "");
@ -142,8 +142,10 @@ struct mdb_txn_safe
static void wait_no_active_txns();
static void allow_new_txns();
mdb_threadinfo* m_tinfo;
MDB_txn* m_txn;
bool m_batch_txn = false;
bool m_check;
static std::atomic<uint64_t> num_active_txns;
// could use a mutex here, but this should be sufficient.