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mdbx: исправление и рефакторинг цикла чтения мета-страниц при старте читающих транзакций.

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Сценарий достаточно запутанный/сложный.
This commit is contained in:
Леонид Юрьев (Leonid Yuriev)
2024-08-11 00:00:22 +03:00
parent aca692212f
commit b054a69e72
4 changed files with 51 additions and 38 deletions
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10
src/coherency.c
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@@ -152,18 +152,20 @@ __cold int coherency_timeout(uint64_t *timestamp, intptr_t pgno,
/* check with timeout as the workaround
* for https://libmdbx.dqdkfa.ru/dead-github/issues/269 */
__hot int coherency_check_head(MDBX_txn *txn, const meta_ptr_t head,
__hot int coherency_fetch_head(MDBX_txn *txn, const meta_ptr_t head,
uint64_t *timestamp) {
/* Copy the DB info and flags */
txn->geo = head.ptr_v->geometry;
txn->txnid = head.txnid;
txn->geo = head.ptr_c->geometry;
memcpy(txn->dbs, &head.ptr_c->trees, sizeof(head.ptr_c->trees));
STATIC_ASSERT(sizeof(head.ptr_c->trees) == CORE_DBS * sizeof(tree_t));
VALGRIND_MAKE_MEM_UNDEFINED(txn->dbs + CORE_DBS,
txn->env->max_dbi - CORE_DBS);
txn->canary = head.ptr_v->canary;
txn->canary = head.ptr_c->canary;
if (unlikely(!coherency_check(txn->env, head.txnid, txn->dbs, head.ptr_v,
*timestamp == 0)))
*timestamp == 0) ||
txn->txnid != meta_txnid(head.ptr_v)))
return coherency_timeout(timestamp, -1, txn->env);
if (unlikely(txn->dbs[FREE_DBI].flags != MDBX_INTEGERKEY)) {