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mdbx-windows: more safety/robustness for DB shriking.

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This commit is contained in:
Leo Yuriev 2018-11-22 16:23:48 +03:00
parent 35f95e8ca2
commit f55e1ec5cc
1 changed files with 41 additions and 2 deletions
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43
src/mdbx.c
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@ -3349,6 +3349,13 @@ static int mdbx_txn_renew0(MDBX_txn *txn, unsigned flags) {
}
}
txn->mt_owner = mdbx_thread_self();
#if defined(_WIN32) || defined(_WIN64)
if ((txn->mt_flags & MDBX_TXN_RDONLY) != 0 && size > env->me_dbgeo.lower &&
env->me_dbgeo.shrink) {
txn->mt_flags |= MDBX_SHRINK_ALLOWED;
mdbx_srwlock_AcquireShared(&env->me_remap_guard);
}
#endif
return MDBX_SUCCESS;
}
bailout:
@ -3516,8 +3523,8 @@ int mdbx_txn_begin(MDBX_env *env, MDBX_txn *parent, unsigned flags,
if (txn != env->me_txn0)
mdbx_free(txn);
} else {
mdbx_assert(env,
(txn->mt_flags & ~(MDBX_TXN_RDONLY | MDBX_TXN_WRITEMAP)) == 0);
mdbx_assert(env, (txn->mt_flags & ~(MDBX_TXN_RDONLY | MDBX_TXN_WRITEMAP |
MDBX_SHRINK_ALLOWED)) == 0);
txn->mt_signature = MDBX_MT_SIGNATURE;
*ret = txn;
mdbx_debug("begin txn %" PRIaTXN "%c %p on env %p, root page %" PRIaPGNO
@ -3610,6 +3617,10 @@ static int mdbx_txn_end(MDBX_txn *txn, unsigned mode) {
txn->mt_dbs[FREE_DBI].md_root);
if (F_ISSET(txn->mt_flags, MDBX_TXN_RDONLY)) {
#if defined(_WIN32) || defined(_WIN64)
if (txn->mt_flags & MDBX_SHRINK_ALLOWED)
mdbx_srwlock_ReleaseShared(&env->me_remap_guard);
#endif
if (txn->mt_ro_reader) {
txn->mt_ro_reader->mr_txnid = ~(txnid_t)0;
env->me_lck->mti_readers_refresh_flag = true;
@ -5843,6 +5854,34 @@ LIBMDBX_API int mdbx_env_set_geometry(MDBX_env *env, intptr_t size_lower,
meta.mm_geo.shrink == bytes2pgno(env, env->me_dbgeo.shrink));
if (memcmp(&meta.mm_geo, &head->mm_geo, sizeof(meta.mm_geo))) {
#if defined(_WIN32) || defined(_WIN64)
/* Was DB shrinking disabled before and now it will be enabled? */
if (meta.mm_geo.lower < meta.mm_geo.upper && meta.mm_geo.shrink &&
!(head->mm_geo.lower < head->mm_geo.upper && head->mm_geo.shrink)) {
rc = mdbx_rdt_lock(env);
if (unlikely(rc != MDBX_SUCCESS))
goto bailout;
/* Check if there are any reading threads that do not use the SRWL */
const mdbx_pid_t CurrentTid = GetCurrentThreadId();
const MDBX_reader *const begin = env->me_lck->mti_readers;
const MDBX_reader *const end = begin + env->me_lck->mti_numreaders;
for (const MDBX_reader *reader = begin; reader < end; ++reader) {
if (reader->mr_pid == env->me_pid && reader->mr_tid &&
reader->mr_tid != CurrentTid) {
/* At least one thread may don't use SRWL */
rc = MDBX_EPERM;
break;
}
}
mdbx_rdt_unlock(env);
if (unlikely(rc != MDBX_SUCCESS))
goto bailout;
}
#endif
if (meta.mm_geo.now != head->mm_geo.now ||
meta.mm_geo.upper != head->mm_geo.upper) {
rc = mdbx_mapresize(env, meta.mm_geo.now, meta.mm_geo.upper);