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mdbx: добавление cursor_reset() и cursor_drown().

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This commit is contained in:
Леонид Юрьев (Leonid Yuriev) 2025-03-06 17:00:21 +03:00
parent 333069e7a8
commit 1299653457
3 changed files with 32 additions and 16 deletions
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26
src/api-cursor.c
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@ -12,8 +12,7 @@ MDBX_cursor *mdbx_cursor_create(void *context) {
couple->outer.signature = cur_signature_ready4dispose;
couple->outer.next = &couple->outer;
couple->userctx = context;
couple->outer.top_and_flags = z_poor_mark;
couple->inner.cursor.top_and_flags = z_poor_mark | z_inner;
cursor_reset(couple);
VALGRIND_MAKE_MEM_DEFINED(&couple->outer.backup, sizeof(couple->outer.backup));
VALGRIND_MAKE_MEM_DEFINED(&couple->outer.tree, sizeof(couple->outer.tree));
VALGRIND_MAKE_MEM_DEFINED(&couple->outer.clc, sizeof(couple->outer.clc));
@ -31,13 +30,15 @@ int mdbx_cursor_reset(MDBX_cursor *mc) {
if (unlikely(!mc))
return LOG_IFERR(MDBX_EINVAL);
if (unlikely(mc->signature != cur_signature_ready4dispose && mc->signature != cur_signature_live))
return LOG_IFERR(MDBX_EBADSIGN);
if (likely(mc->signature == cur_signature_live)) {
cursor_reset((cursor_couple_t *)mc);
return MDBX_SUCCESS;
}
cursor_couple_t *couple = (cursor_couple_t *)mc;
couple->outer.top_and_flags = z_poor_mark;
couple->inner.cursor.top_and_flags = z_poor_mark | z_inner;
return MDBX_SUCCESS;
if (likely(mc->signature == cur_signature_ready4dispose))
return MDBX_SUCCESS;
return LOG_IFERR(MDBX_EBADSIGN);
}
int mdbx_cursor_bind(MDBX_txn *txn, MDBX_cursor *mc, MDBX_dbi dbi) {
@ -113,7 +114,7 @@ int mdbx_cursor_unbind(MDBX_cursor *mc) {
}
mc->next = mc;
}
be_poor(mc);
cursor_drown((cursor_couple_t *)mc);
mc->signature = cur_signature_ready4dispose;
return MDBX_SUCCESS;
}
@ -222,10 +223,9 @@ int mdbx_txn_release_all_cursors_ex(const MDBX_txn *txn, bool unbind, size_t *co
ENSURE(nullptr, mc->signature == cur_signature_live && (mc->next != mc) && !mc->backup);
txn->cursors[i] = mc->next;
mc->next = mc;
if (unbind) {
be_poor(mc);
mc->signature = cur_signature_ready4dispose;
} else {
mc->signature = cur_signature_ready4dispose;
cursor_drown((cursor_couple_t *)mc);
if (!unbind) {
mc->signature = 0;
osal_free(mc);
}

6
src/cursor.c
View File

@ -216,7 +216,6 @@ int cursor_shadow(MDBX_cursor *cursor, MDBX_txn *nested, const size_t dbi) {
MDBX_cursor *cursor_eot(MDBX_cursor *cursor, MDBX_txn *txn) {
MDBX_cursor *const next = cursor->next;
cursor->next = cursor;
const unsigned stage = cursor->signature;
MDBX_cursor *const shadow = cursor->backup;
ENSURE(txn->env, stage == cur_signature_live || (stage == cur_signature_wait4eot && shadow));
@ -224,7 +223,7 @@ MDBX_cursor *cursor_eot(MDBX_cursor *cursor, MDBX_txn *txn) {
if (shadow) {
subcur_t *subcur = cursor->subcur;
tASSERT(txn, txn->parent != nullptr && shadow->txn == txn->parent);
/* Zap: Using uninitialized memory '*mc->backup'. */
/* Zap: Using uninitialized memory '*subcur->backup'. */
MDBX_SUPPRESS_GOOFY_MSVC_ANALYZER(6001);
ENSURE(txn->env, shadow->signature == cur_signature_live);
tASSERT(txn, subcur == shadow->subcur);
@ -250,7 +249,8 @@ MDBX_cursor *cursor_eot(MDBX_cursor *cursor, MDBX_txn *txn) {
osal_free(shadow);
} else {
ENSURE(cursor->txn->env, stage == cur_signature_live);
be_poor(cursor);
cursor_drown((cursor_couple_t *)cursor);
cursor->next = cursor;
cursor->signature = cur_signature_ready4dispose /* Cursor may be reused */;
}
return next;

16
src/cursor.h
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@ -355,3 +355,19 @@ MDBX_MAYBE_UNUSED static inline void cursor_inner_refresh(const MDBX_cursor *mc,
}
MDBX_MAYBE_UNUSED MDBX_INTERNAL bool cursor_is_tracked(const MDBX_cursor *mc);
static inline void cursor_reset(cursor_couple_t *couple) {
couple->outer.top_and_flags = z_fresh_mark;
couple->inner.cursor.top_and_flags = z_fresh_mark | z_inner;
}
static inline void cursor_drown(cursor_couple_t *couple) {
couple->outer.top_and_flags = z_poor_mark;
couple->inner.cursor.top_and_flags = z_poor_mark | z_inner;
couple->outer.txn = nullptr;
couple->inner.cursor.txn = nullptr;
couple->outer.tree = nullptr;
/* сохраняем clc-указатель, так он используется для вычисления dbi в mdbx_cursor_renew(). */
couple->outer.dbi_state = nullptr;
couple->inner.cursor.dbi_state = nullptr;
}