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mdbx: refine ending of read-only transactions.

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Change-Id: I56d07d75e4f5f64fd34e5b780024c145eb8299ed
This commit is contained in:
Leonid Yuriev 2019-10-11 20:23:21 +03:00
parent 99e9956410
commit 4560ddcd1e
1 changed files with 19 additions and 12 deletions
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31
src/elements/core.c
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@ -4415,23 +4415,30 @@ static int mdbx_txn_end(MDBX_txn *txn, unsigned mode) {
if (F_ISSET(txn->mt_flags, MDBX_RDONLY)) {
if (txn->to.reader) {
mdbx_ensure(env, /* paranoia is appropriate here */
txn->mt_txnid == txn->to.reader->mr_txnid.inconsistent &&
txn->to.reader->mr_txnid.inconsistent >=
env->me_lck->mti_oldest_reader);
txn->to.reader->mr_snapshot_pages_used = 0;
safe64_reset(&txn->to.reader->mr_txnid);
MDBX_reader *slot = txn->to.reader;
mdbx_assert(env, slot->mr_pid == env->me_pid);
if (likely(!F_ISSET(txn->mt_flags, MDBX_TXN_FINISHED))) {
mdbx_assert(env, txn->mt_txnid == slot->mr_txnid.inconsistent &&
slot->mr_txnid.inconsistent >=
env->me_lck->mti_oldest_reader);
#if defined(MDBX_USE_VALGRIND) || defined(__SANITIZE_ADDRESS__)
mdbx_txn_valgrind(env, nullptr);
#endif
slot->mr_snapshot_pages_used = 0;
safe64_reset(&slot->mr_txnid);
env->me_lck->mti_readers_refresh_flag = true;
mdbx_flush_noncoherent_cpu_writeback();
} else {
mdbx_assert(env, slot->mr_pid == env->me_pid);
mdbx_assert(env,
slot->mr_txnid.inconsistent >= SAFE64_INVALID_THRESHOLD);
}
if (mode & MDBX_END_SLOT) {
if ((env->me_flags & MDBX_ENV_TXKEY) == 0)
txn->to.reader->mr_pid = 0;
slot->mr_pid = 0;
txn->to.reader = NULL;
}
env->me_lck->mti_readers_refresh_flag = true;
mdbx_flush_noncoherent_cpu_writeback();
}
#if defined(MDBX_USE_VALGRIND) || defined(__SANITIZE_ADDRESS__)
mdbx_txn_valgrind(env, nullptr);
#endif
#if defined(_WIN32) || defined(_WIN64)
if (txn->mt_flags & MDBX_SHRINK_ALLOWED)
mdbx_srwlock_ReleaseShared(&env->me_remap_guard);