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mdbx: переработка mdbx_txn_release_all_cursors_ex() (backport).

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This commit is contained in:
Леонид Юрьев (Leonid Yuriev)
2025-03-20 01:42:50 +03:00
parent 682233ba28
commit 5fd319bbc2
2 changed files with 43 additions and 34 deletions
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51
src/api-cursor.c
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@@ -233,28 +233,43 @@ int mdbx_txn_release_all_cursors_ex(const MDBX_txn *txn, bool unbind, size_t *co
int rc = check_txn(txn, MDBX_TXN_FINISHED | MDBX_TXN_HAS_CHILD);
if (unlikely(rc != MDBX_SUCCESS))
return LOG_IFERR(rc);
if (unlikely(txn->parent)) {
rc = MDBX_BAD_TXN;
ERROR("%s, err %d", "must not unbind or close cursors for a nested txn", rc);
return rc;
}
size_t n = 0;
TXN_FOREACH_DBI_FROM(txn, i, MAIN_DBI) {
while (txn->cursors[i]) {
++n;
MDBX_cursor *mc = txn->cursors[i];
ENSURE(nullptr, mc->signature == cur_signature_live && (mc->next != mc) && !mc->backup);
txn->cursors[i] = mc->next;
mc->next = mc;
mc->signature = cur_signature_ready4dispose;
cursor_drown((cursor_couple_t *)mc);
if (!unbind) {
mc->signature = 0;
osal_free(mc);
do {
TXN_FOREACH_DBI_FROM(txn, i, MAIN_DBI) {
MDBX_cursor *mc = txn->cursors[i], *next = nullptr;
if (mc) {
txn->cursors[i] = nullptr;
do {
next = mc->next;
if (mc->signature == cur_signature_live) {
mc->signature = cur_signature_wait4eot;
cursor_drown((cursor_couple_t *)mc);
} else
ENSURE(nullptr, mc->signature == cur_signature_wait4eot);
if (mc->backup) {
MDBX_cursor *bk = mc->backup;
mc->next = bk->next;
mc->backup = bk->backup;
mc->backup = nullptr;
bk->signature = 0;
bk = bk->next;
osal_free(bk);
} else {
mc->signature = cur_signature_ready4dispose;
mc->next = mc;
++n;
if (!unbind) {
mc->signature = 0;
osal_free(mc);
}
}
} while ((mc = next) != nullptr);
}
}
}
txn = txn->parent;
} while (txn);
if (count)
*count = n;
return MDBX_SUCCESS;