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mdbx: avoid extra looping inside mdbx_env_info_ex().

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This commit is contained in:
Leonid Yuriev 2021-12-07 01:45:41 +03:00
parent 839da86cac
commit f4057b2c3b
1 changed files with 14 additions and 14 deletions
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28
src/core.c
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@ -19540,20 +19540,17 @@ __cold static int fetch_envinfo_ex(const MDBX_env *env, const MDBX_txn *txn,
#endif /* MDBX_ENABLE_PGOP_STAT*/
}
arg->mi_self_latter_reader_txnid = arg->mi_latter_reader_txnid = 0;
if (lck) {
arg->mi_self_latter_reader_txnid = arg->mi_latter_reader_txnid =
arg->mi_recent_txnid;
for (unsigned i = 0; i < arg->mi_numreaders; ++i) {
const uint32_t pid =
atomic_load32(&lck->mti_readers[i].mr_pid, mo_AcquireRelease);
if (pid) {
const txnid_t txnid = safe64_read(&lck->mti_readers[i].mr_txnid);
if (arg->mi_latter_reader_txnid > txnid)
arg->mi_latter_reader_txnid = txnid;
if (pid == env->me_pid && arg->mi_self_latter_reader_txnid > txnid)
arg->mi_self_latter_reader_txnid = txnid;
}
arg->mi_self_latter_reader_txnid = arg->mi_latter_reader_txnid =
arg->mi_recent_txnid;
for (unsigned i = 0; i < arg->mi_numreaders; ++i) {
const uint32_t pid =
atomic_load32(&lck->mti_readers[i].mr_pid, mo_AcquireRelease);
if (pid) {
const txnid_t txnid = safe64_read(&lck->mti_readers[i].mr_txnid);
if (arg->mi_latter_reader_txnid > txnid)
arg->mi_latter_reader_txnid = txnid;
if (pid == env->me_pid && arg->mi_self_latter_reader_txnid > txnid)
arg->mi_self_latter_reader_txnid = txnid;
}
}
@ -19596,6 +19593,9 @@ __cold int mdbx_env_info_ex(const MDBX_env *env, const MDBX_txn *txn,
rc = fetch_envinfo_ex(env, txn, arg, bytes);
if (unlikely(rc != MDBX_SUCCESS))
return rc;
snap.mi_since_sync_seconds16dot16 = arg->mi_since_sync_seconds16dot16;
snap.mi_since_reader_check_seconds16dot16 =
arg->mi_since_reader_check_seconds16dot16;
if (likely(memcmp(&snap, arg, bytes) == 0))
return MDBX_SUCCESS;
memcpy(&snap, arg, bytes);