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Optimize code holding reader mutex

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This commit is contained in:
Hallvard Furuseth 2013-10-03 23:59:24 +02:00
parent 3d67838a59
commit 3a1d73daff
1 changed files with 16 additions and 13 deletions
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29
libraries/liblmdb/mdb.c
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@ -2119,8 +2119,9 @@ static int
mdb_txn_renew0(MDB_txn *txn)
{
MDB_env *env = txn->mt_env;
MDB_txninfo *ti = env->me_txns;
MDB_meta *meta;
unsigned int i;
unsigned int i, nr;
uint16_t x;
int rc, new_notls = 0;
@ -2129,7 +2130,7 @@ mdb_txn_renew0(MDB_txn *txn)
txn->mt_dbxs = env->me_dbxs; /* mostly static anyway */
if (txn->mt_flags & MDB_TXN_RDONLY) {
if (!env->me_txns) {
if (!ti) {
meta = env->me_metas[ mdb_env_pick_meta(env) ];
txn->mt_txnid = meta->mm_txnid;
txn->mt_u.reader = NULL;
@ -2153,36 +2154,38 @@ mdb_txn_renew0(MDB_txn *txn)
}
LOCK_MUTEX_R(env);
for (i=0; i<env->me_txns->mti_numreaders; i++)
if (env->me_txns->mti_readers[i].mr_pid == 0)
nr = ti->mti_numreaders;
for (i=0; i<nr; i++)
if (ti->mti_readers[i].mr_pid == 0)
break;
if (i == env->me_maxreaders) {
UNLOCK_MUTEX_R(env);
return MDB_READERS_FULL;
}
env->me_txns->mti_readers[i].mr_pid = pid;
env->me_txns->mti_readers[i].mr_tid = tid;
if (i >= env->me_txns->mti_numreaders)
env->me_txns->mti_numreaders = i+1;
ti->mti_readers[i].mr_pid = pid;
ti->mti_readers[i].mr_tid = tid;
if (i == nr)
ti->mti_numreaders = ++nr;
/* Save numreaders for un-mutexed mdb_env_close() */
env->me_numreaders = env->me_txns->mti_numreaders;
env->me_numreaders = nr;
UNLOCK_MUTEX_R(env);
r = &env->me_txns->mti_readers[i];
r = &ti->mti_readers[i];
new_notls = (env->me_flags & MDB_NOTLS);
if (!new_notls && (rc=pthread_setspecific(env->me_txkey, r))) {
r->mr_pid = 0;
return rc;
}
}
txn->mt_txnid = r->mr_txnid = env->me_txns->mti_txnid;
txn->mt_txnid = r->mr_txnid = ti->mti_txnid;
txn->mt_u.reader = r;
meta = env->me_metas[txn->mt_txnid & 1];
}
} else {
if (env->me_txns) {
if (ti) {
LOCK_MUTEX_W(env);
txn->mt_txnid = env->me_txns->mti_txnid;
txn->mt_txnid = ti->mti_txnid;
meta = env->me_metas[txn->mt_txnid & 1];
} else {
meta = env->me_metas[ mdb_env_pick_meta(env) ];