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mdbx: add internal txn_basis_snapshot().

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This commit is contained in:
Леонид Юрьев (Leonid Yuriev)
2025-09-07 00:04:01 +03:00
parent fc4c02511d
commit cd27aa017f
2 changed files with 9 additions and 1 deletions
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2
src/api-txn-data.c
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@@ -191,7 +191,7 @@ int mdbx_is_dirty(const MDBX_txn *txn, const void *ptr) {
* not to the beginning of a data. */
return LOG_IFERR(MDBX_EINVAL);
}
return ((txn->flags & MDBX_TXN_RDONLY) || !is_modifable(txn, page)) ? MDBX_RESULT_FALSE : MDBX_RESULT_TRUE;
return (page->txnid > txn_basis_snapshot(txn)) ? MDBX_RESULT_TRUE : MDBX_RESULT_FALSE;
}
if ((size_t)offset < env->dxb_mmap.limit) {
/* Указатель адресует что-то в пределах mmap, но за границей

8
src/cogs.h
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@@ -503,6 +503,14 @@ static inline int check_txn_rw(const MDBX_txn *txn, int bad_bits) {
return check_txn(txn, (bad_bits | MDBX_TXN_RDONLY) & ~MDBX_TXN_PARKED);
}
MDBX_NOTHROW_CONST_FUNCTION static inline txnid_t txn_basis_snapshot(const MDBX_txn *txn) {
STATIC_ASSERT((MDBX_TXN_RDONLY >> 17) == 1);
STATIC_ASSERT((xMDBX_TXNID_STEP >> (xMDBX_TXNID_STEP == 2)) == 1);
const txnid_t committed_txnid = txn->txnid + (xMDBX_TXNID_STEP >> (xMDBX_TXNID_STEP == 2)) - ((txn->flags >> 17) & 1);
tASSERT(txn, committed_txnid == ((txn->flags & MDBX_TXN_RDONLY) ? txn->txnid : txn->txnid - xMDBX_TXNID_STEP));
return committed_txnid;
}
/*----------------------------------------------------------------------------*/
MDBX_INTERNAL void mincore_clean_cache(const MDBX_env *const env);