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mdbx: add MDBX_TXNID_STEP macro for debugging.

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Change-Id: I4768c8b39f3317ec3a5da8627d736f2f28bf0d51
This commit is contained in:
Leonid Yuriev 2019-10-15 23:53:00 +03:00
parent 8467552f0b
commit b84bb4f805
2 changed files with 7 additions and 6 deletions
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8
src/elements/core.c
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@ -2707,7 +2707,7 @@ static __hot txnid_t mdbx_recent_steady_txnid(const MDBX_env *env) {
static __hot txnid_t mdbx_reclaiming_detent(const MDBX_env *env) {
if (F_ISSET(env->me_flags, MDBX_UTTERLY_NOSYNC))
return likely(env->me_txn0->mt_owner == mdbx_thread_self())
? env->me_txn0->mt_txnid - 1
? env->me_txn0->mt_txnid - MDBX_TXNID_STEP
: mdbx_recent_committed_txnid(env);
return mdbx_recent_steady_txnid(env);
@ -4016,11 +4016,7 @@ static int mdbx_txn_renew0(MDBX_txn *txn, unsigned flags) {
mdbx_jitter4testing(false);
txn->mt_canary = meta->mm_canary;
const txnid_t snap = mdbx_meta_txnid_stable(env, meta);
#if MDBX_DEBUG
txn->mt_txnid = snap + UINT32_MAX / 3;
#else
txn->mt_txnid = snap + 1;
#endif
txn->mt_txnid = snap + MDBX_TXNID_STEP;
if (unlikely(txn->mt_txnid >= SAFE64_INVALID_THRESHOLD)) {
mdbx_debug("txnid overflow!");
rc = MDBX_TXN_FULL;

5
src/elements/internals.h
View File

@ -280,6 +280,11 @@ typedef uint32_t pgno_t;
typedef uint64_t txnid_t;
#define PRIaTXN PRIi64
#define MIN_TXNID UINT64_C(1)
/* LY: for testing non-atomic 64-bit txnid on 32-bit arches.
* #define MDBX_TXNID_STEP (UINT32_MAX / 3) */
#ifndef MDBX_TXNID_STEP
#define MDBX_TXNID_STEP 1
#endif /* MDBX_TXNID_STEP */
/* Used for offsets within a single page.
* Since memory pages are typically 4 or 8KB in size, 12-13 bits,