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LMDB: fix deadlock in resized detection

This commit is contained in:
Howard Chu 2021-09-19 21:12:27 +01:00
parent a39b1d56c8
commit 5f54dea4ec
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GPG Key ID: FD2A70B44AB11BA7
2 changed files with 13 additions and 3 deletions
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15
src/blockchain_db/lmdb/db_lmdb.cpp
View File

@ -467,7 +467,12 @@ void mdb_txn_safe::allow_new_txns()
creation_gate.clear();
}
void lmdb_resized(MDB_env *env)
void mdb_txn_safe::increment_txns(int i)
{
num_active_txns += i;
}
void lmdb_resized(MDB_env *env, int isactive)
{
mdb_txn_safe::prevent_new_txns();
@ -478,7 +483,11 @@ void lmdb_resized(MDB_env *env)
mdb_env_info(env, &mei);
uint64_t old = mei.me_mapsize;
if (isactive)
mdb_txn_safe::increment_txns(-1);
mdb_txn_safe::wait_no_active_txns();
if (isactive)
mdb_txn_safe::increment_txns(1);
int result = mdb_env_set_mapsize(env, 0);
if (result)
@ -496,7 +505,7 @@ inline int lmdb_txn_begin(MDB_env *env, MDB_txn *parent, unsigned int flags, MDB
{
int res = mdb_txn_begin(env, parent, flags, txn);
if (res == MDB_MAP_RESIZED) {
lmdb_resized(env);
lmdb_resized(env, 1);
res = mdb_txn_begin(env, parent, flags, txn);
}
return res;
@ -506,7 +515,7 @@ inline int lmdb_txn_renew(MDB_txn *txn)
{
int res = mdb_txn_renew(txn);
if (res == MDB_MAP_RESIZED) {
lmdb_resized(mdb_txn_env(txn));
lmdb_resized(mdb_txn_env(txn), 0);
res = mdb_txn_renew(txn);
}
return res;

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

@ -154,6 +154,7 @@ struct mdb_txn_safe
static void prevent_new_txns();
static void wait_no_active_txns();
static void allow_new_txns();
static void increment_txns(int);
mdb_threadinfo* m_tinfo;
MDB_txn* m_txn;