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Track changes to all cursors.

Browse Source 
For any change to a page or node, update all other cursors pointing
at the same page (or node). Cursors are now stored in a linked list
off their owning transaction. Cursors are all closed when the transaction
ends. Cursors in parent transactions are updated when their child
transaction commits.
This commit is contained in:
Howard Chu 2011-09-21 14:14:11 -07:00
parent c4d5e6e786
commit b9d13a29e6
2 changed files with 330 additions and 34 deletions
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361
libraries/libmdb/mdb.c
View File

@ -731,6 +731,8 @@ struct MDB_txn {
#define DB_DIRTY 0x01 /**< DB was written in this txn */
#define DB_STALE 0x02 /**< DB record is older than txnID */
/** @} */
/** Array of cursors for each DB */
MDB_cursor **mt_cursors;
/** Array of flags for each DB */
unsigned char *mt_dbflags;
/** Number of DB records in use. This number only ever increments;
@ -762,6 +764,10 @@ struct MDB_xcursor;
/** Cursors are used for all DB operations */
struct MDB_cursor {
/** Next cursor on this DB in this txn */
MDB_cursor *mc_next;
/** Original cursor if this is a shadow */
MDB_cursor *mc_orig;
/** Context used for databases with #MDB_DUPSORT, otherwise NULL */
struct MDB_xcursor *mc_xcursor;
/** The transaction that owns this cursor */
@ -783,6 +789,8 @@ struct MDB_cursor {
*/
#define C_INITIALIZED 0x01 /**< cursor has been initialized and is valid */
#define C_EOF 0x02 /**< No more data */
#define C_SUB 0x04 /**< Cursor is a sub-cursor */
#define C_SHADOW 0x08 /**< Cursor is a dup from a parent txn */
/** @} */
unsigned int mc_flags; /**< @ref mdb_cursor */
MDB_page *mc_pg[CURSOR_STACK]; /**< stack of pushed pages */
@ -1160,6 +1168,26 @@ mdb_page_touch(MDB_cursor *mc)
mp->mp_flags |= P_DIRTY;
finish:
/* Adjust other cursors pointing to mp */
if (mc->mc_flags & C_SUB) {
MDB_cursor *m2, *m3;
MDB_dbi dbi = mc->mc_dbi-1;
for (m2 = mc->mc_txn->mt_cursors[dbi]; m2; m2=m2->mc_next) {
m3 = &m2->mc_xcursor->mx_cursor;
if (m3->mc_pg[mc->mc_top] == mc->mc_pg[mc->mc_top]) {
m3->mc_pg[mc->mc_top] = mp;
}
}
} else {
MDB_cursor *m2;
for (m2 = mc->mc_txn->mt_cursors[mc->mc_dbi]; m2; m2=m2->mc_next) {
if (m2->mc_pg[mc->mc_top] == mc->mc_pg[mc->mc_top]) {
m2->mc_pg[mc->mc_top] = mp;
}
}
}
mc->mc_pg[mc->mc_top] = mp;
/** If this page has a parent, update the parent to point to
* this new page.
@ -1208,6 +1236,92 @@ mdb_env_sync(MDB_env *env, int force)
return rc;
}
/** Make shadow copies of all of parent txn's cursors */
static int
mdb_cursor_shadow(MDB_txn *src, MDB_txn *dst)
{
MDB_cursor *mc, *m2;
unsigned int i, j, size;
for (i=0;i<src->mt_numdbs; i++) {
if (src->mt_cursors[i]) {
size = sizeof(MDB_cursor);
if (src->mt_cursors[i]->mc_xcursor)
size += sizeof(MDB_xcursor);
for (m2 = src->mt_cursors[i]; m2; m2=m2->mc_next) {
mc = malloc(size);
if (!mc)
return ENOMEM;
mc->mc_orig = m2;
mc->mc_txn = dst;
mc->mc_dbi = i;
mc->mc_db = &dst->mt_dbs[i];
mc->mc_dbx = m2->mc_dbx;
mc->mc_dbflag = &dst->mt_dbflags[i];
mc->mc_snum = m2->mc_snum;
mc->mc_top = m2->mc_top;
mc->mc_flags = m2->mc_flags | C_SHADOW;
for (j=0; j<mc->mc_snum; j++) {
mc->mc_pg[j] = m2->mc_pg[j];
mc->mc_ki[j] = m2->mc_ki[j];
}
if (m2->mc_xcursor) {
MDB_xcursor *mx, *mx2;
mx = (MDB_xcursor *)(mc+1);
mc->mc_xcursor = mx;
mx2 = m2->mc_xcursor;
mx->mx_db = mx2->mx_db;
mx->mx_dbx = mx2->mx_dbx;
mx->mx_dbflag = mx2->mx_dbflag;
mx->mx_cursor.mc_txn = dst;
mx->mx_cursor.mc_dbi = mx2->mx_cursor.mc_dbi;
mx->mx_cursor.mc_db = &mx->mx_db;
mx->mx_cursor.mc_dbx = &mx->mx_dbx;
mx->mx_cursor.mc_dbflag = &mx->mx_dbflag;
mx->mx_cursor.mc_snum = mx2->mx_cursor.mc_snum;
mx->mx_cursor.mc_top = mx2->mx_cursor.mc_top;
mx->mx_cursor.mc_flags = mx2->mx_cursor.mc_flags | C_SHADOW;
for (j=0; j<mx2->mx_cursor.mc_snum; j++) {
mx->mx_cursor.mc_pg[j] = mx2->mx_cursor.mc_pg[j];
mx->mx_cursor.mc_ki[j] = mx2->mx_cursor.mc_ki[j];
}
} else {
mc->mc_xcursor = NULL;
}
mc->mc_next = dst->mt_cursors[i];
dst->mt_cursors[i] = mc;
}
}
}
return MDB_SUCCESS;
}
/** Merge shadow cursors back into parent's */
static void
mdb_cursor_merge(MDB_txn *txn)
{
MDB_dbi i;
for (i=0; i<txn->mt_numdbs; i++) {
if (txn->mt_cursors[i]) {
MDB_cursor *mc;
while ((mc = txn->mt_cursors[i])) {
txn->mt_cursors[i] = mc->mc_next;
if (mc->mc_flags & C_SHADOW) {
MDB_cursor *m2 = mc->mc_orig;
unsigned int j;
m2->mc_snum = mc->mc_snum;
m2->mc_top = mc->mc_top;
for (j=0; j<mc->mc_snum; j++) {
m2->mc_pg[j] = mc->mc_pg[j];
m2->mc_ki[j] = mc->mc_ki[j];
}
}
free(mc);
}
}
}
}
static void
mdb_txn_reset0(MDB_txn *txn);
@ -1312,7 +1426,7 @@ int
mdb_txn_begin(MDB_env *env, MDB_txn *parent, unsigned int flags, MDB_txn **ret)
{
MDB_txn *txn;
int rc;
int rc, size;
if (env->me_flags & MDB_FATAL_ERROR) {
DPUTS("environment had fatal error, must shutdown!");
@ -1324,16 +1438,22 @@ mdb_txn_begin(MDB_env *env, MDB_txn *parent, unsigned int flags, MDB_txn **ret)
return EINVAL;
}
}
if ((txn = calloc(1, sizeof(MDB_txn) +
env->me_maxdbs * (sizeof(MDB_db)+1))) == NULL) {
size = sizeof(MDB_txn) + env->me_maxdbs * (sizeof(MDB_db)+1);
if (!(flags & MDB_RDONLY))
size += env->me_maxdbs * sizeof(MDB_cursor *);
if ((txn = calloc(1, size)) == NULL) {
DPRINTF("calloc: %s", strerror(ErrCode()));
return ENOMEM;
}
txn->mt_dbs = (MDB_db *)(txn+1);
if (flags & MDB_RDONLY) {
txn->mt_flags |= MDB_TXN_RDONLY;
txn->mt_dbflags = (unsigned char *)(txn->mt_dbs + env->me_maxdbs);
} else {
txn->mt_cursors = (MDB_cursor **)(txn->mt_dbs + env->me_maxdbs);
txn->mt_dbflags = (unsigned char *)(txn->mt_cursors + env->me_maxdbs);
}
txn->mt_dbflags = (unsigned char *)(txn->mt_dbs + env->me_maxdbs);
txn->mt_env = env;
if (parent) {
@ -1359,6 +1479,7 @@ mdb_txn_begin(MDB_env *env, MDB_txn *parent, unsigned int flags, MDB_txn **ret)
txn->mt_dbxs = parent->mt_dbxs;
memcpy(txn->mt_dbs, parent->mt_dbs, txn->mt_numdbs * sizeof(MDB_db));
memcpy(txn->mt_dbflags, parent->mt_dbflags, txn->mt_numdbs);
mdb_cursor_shadow(parent, txn);
rc = 0;
} else {
rc = mdb_txn_renew0(txn);
@ -1390,6 +1511,17 @@ mdb_txn_reset0(MDB_txn *txn)
MDB_page *dp;
unsigned int i;
/* close(free) all cursors */
for (i=0; i<txn->mt_numdbs; i++) {
if (txn->mt_cursors[i]) {
MDB_cursor *mc;
while ((mc = txn->mt_cursors[i])) {
txn->mt_cursors[i] = mc->mc_next;
free(mc);
}
}
}
/* return all dirty pages to dpage list */
for (i=1; i<=txn->mt_u.dirty_list[0].mid; i++) {
dp = txn->mt_u.dirty_list[i].mptr;
@ -1497,7 +1629,6 @@ mdb_txn_commit(MDB_txn *txn)
return MDB_SUCCESS;
}
if (F_ISSET(txn->mt_flags, MDB_TXN_ERROR)) {
DPUTS("error flag is set, can't commit");
if (txn->mt_parent)
@ -1506,6 +1637,9 @@ mdb_txn_commit(MDB_txn *txn)
return EINVAL;
}
/* Merge (and close) our cursors with parent's */
mdb_cursor_merge(txn);
if (txn->mt_parent) {
MDB_db *ip, *jp;
MDB_dbi i;
@ -1532,21 +1666,11 @@ mdb_txn_commit(MDB_txn *txn)
src = txn->mt_u.dirty_list;
x = mdb_mid2l_search(dst, src[1].mid);
for (y=1; y<=src[0].mid; y++) {
MDB_page *mp;
while (x <= dst[0].mid && dst[x].mid != src[y].mid) x++;
if (x > dst[0].mid)
break;
mp = dst[x].mptr;
dp = src[y].mptr;
mp->mp_lower = dp->mp_lower;
mp->mp_upper = dp->mp_upper;
if (IS_LEAF2(mp)) {
memcpy(METADATA(mp), METADATA(dp), NUMKEYS(mp) * mp->mp_pad);
} else {
memcpy((char *)mp+mp->mp_upper, (char *)dp+dp->mp_upper,
txn->mt_env->me_psize - mp->mp_upper);
}
free(src[y].mptr);
free(dst[x].mptr);
dst[x].mptr = src[y].mptr;
}
x = dst[0].mid;
for (; y<=src[0].mid; y++) {
@ -2838,6 +2962,20 @@ mdb_node_search(MDB_cursor *mc, MDB_val *key, int *exactp)
return node;
}
#if 0
static void
mdb_cursor_adjust(MDB_cursor *mc, func)
{
MDB_cursor *m2;
for (m2 = mc->mc_txn->mt_cursors[mc->mc_dbi]; m2; m2=m2->mc_next) {
if (m2->mc_pg[m2->mc_top] == mc->mc_pg[mc->mc_top]) {
func(mc, m2);
}
}
}
#endif
/** Pop a page off the top of the cursor's stack. */
static void
mdb_cursor_pop(MDB_cursor *mc)
@ -3790,12 +3928,13 @@ top:
if (flags == MDB_CURRENT)
goto current;
/* create a fake page for the dup items */
dkey.mv_size = NODEDSZ(leaf);
dkey.mv_data = NODEDATA(leaf);
/* data matches, ignore it */
if (!mc->mc_dbx->md_dcmp(data, &dkey))
return (flags == MDB_NODUPDATA) ? MDB_KEYEXIST : MDB_SUCCESS;
/* create a fake page for the dup items */
memcpy(dbuf, dkey.mv_data, dkey.mv_size);
dkey.mv_data = dbuf;
fp = (MDB_page *)pbuf;
@ -3913,6 +4052,26 @@ new_sub:
} else {
/* There is room already in this leaf page. */
rc = mdb_node_add(mc, mc->mc_ki[mc->mc_top], key, rdata, 0, 0);
if (rc == 0 && !do_sub) {
/* Adjust other cursors pointing to mp */
MDB_cursor *m2, *m3;
MDB_dbi dbi = mc->mc_dbi;
unsigned i = mc->mc_top;
MDB_page *mp = mc->mc_pg[i];
if (mc->mc_flags & C_SUB)
dbi--;
for (m2 = mc->mc_txn->mt_cursors[dbi]; m2; m2=m2->mc_next) {
if (mc->mc_flags & C_SUB)
m3 = &m2->mc_xcursor->mx_cursor;
else
m3 = m2;
if (m3->mc_pg[i] == mp && m3->mc_ki[i] >= mc->mc_ki[i]) {
m3->mc_ki[i]++;
}
}
}
}
if (rc != MDB_SUCCESS)
@ -3946,6 +4105,18 @@ put_sub:
rc = mdb_cursor_put(&mc->mc_xcursor->mx_cursor, &dkey, &xdata, xflags);
if (rc)
return rc;
{
/* Adjust other cursors pointing to mp */
MDB_cursor *m2;
unsigned i = mc->mc_top;
MDB_page *mp = mc->mc_pg[i];
for (m2 = mc->mc_txn->mt_cursors[mc->mc_dbi]; m2; m2=m2->mc_next) {
if (m2->mc_pg[i] == mp && m2->mc_ki[i] == mc->mc_ki[i]) {
mdb_xcursor_init1(m2, leaf);
}
}
}
}
rc = mdb_cursor_put(&mc->mc_xcursor->mx_cursor, data, &xdata, xflags);
if (flags & F_SUBDATA) {
@ -4373,7 +4544,7 @@ mdb_xcursor_init1(MDB_cursor *mc, MDB_node *node)
MDB_db *db = NODEDATA(node);
mx->mx_db = *db;
mx->mx_cursor.mc_snum = 0;
mx->mx_cursor.mc_flags = 0;
mx->mx_cursor.mc_flags = C_SUB;
} else {
MDB_page *fp = NODEDATA(node);
mx->mx_db.md_pad = mc->mc_pg[mc->mc_top]->mp_pad;
@ -4385,7 +4556,7 @@ mdb_xcursor_init1(MDB_cursor *mc, MDB_node *node)
mx->mx_db.md_entries = NUMKEYS(fp);
mx->mx_db.md_root = fp->mp_pgno;
mx->mx_cursor.mc_snum = 1;
mx->mx_cursor.mc_flags = C_INITIALIZED;
mx->mx_cursor.mc_flags = C_INITIALIZED|C_SUB;
mx->mx_cursor.mc_top = 0;
mx->mx_cursor.mc_pg[0] = fp;
mx->mx_cursor.mc_ki[0] = 0;
@ -4410,6 +4581,7 @@ mdb_xcursor_init1(MDB_cursor *mc, MDB_node *node)
static void
mdb_cursor_init(MDB_cursor *mc, MDB_txn *txn, MDB_dbi dbi, MDB_xcursor *mx)
{
mc->mc_orig = NULL;
mc->mc_dbi = dbi;
mc->mc_txn = txn;
mc->mc_db = &txn->mt_dbs[dbi];
@ -4444,6 +4616,10 @@ mdb_cursor_open(MDB_txn *txn, MDB_dbi dbi, MDB_cursor **ret)
mx = (MDB_xcursor *)(mc + 1);
}
mdb_cursor_init(mc, txn, dbi, mx);
if (txn->mt_cursors) {
mc->mc_next = txn->mt_cursors[dbi];
txn->mt_cursors[dbi] = mc;
}
} else {
return ENOMEM;
}
@ -4481,6 +4657,13 @@ void
mdb_cursor_close(MDB_cursor *mc)
{
if (mc != NULL) {
/* remove from txn, if tracked */
if (mc->mc_txn->mt_cursors) {
MDB_cursor **prev = &mc->mc_txn->mt_cursors[mc->mc_dbi];
while (*prev && *prev != mc) prev = &(*prev)->mc_next;
if (*prev == mc)
*prev = mc->mc_next;
}
free(mc);
}
}
@ -4594,6 +4777,28 @@ mdb_node_move(MDB_cursor *csrc, MDB_cursor *cdst)
*/
mdb_node_del(csrc->mc_pg[csrc->mc_top], csrc->mc_ki[csrc->mc_top], key.mv_size);
{
/* Adjust other cursors pointing to mp */
MDB_cursor *m2, *m3;
MDB_dbi dbi = csrc->mc_dbi;
MDB_page *mp = csrc->mc_pg[csrc->mc_top];
if (csrc->mc_flags & C_SUB)
dbi--;
for (m2 = csrc->mc_txn->mt_cursors[dbi]; m2; m2=m2->mc_next) {
if (csrc->mc_flags & C_SUB)
m3 = &m2->mc_xcursor->mx_cursor;
else
m3 = m2;
if (m3->mc_pg[csrc->mc_top] == mp && m3->mc_ki[csrc->mc_top] ==
csrc->mc_ki[csrc->mc_top]) {
m3->mc_pg[csrc->mc_top] = cdst->mc_pg[cdst->mc_top];
m3->mc_ki[csrc->mc_top] = cdst->mc_ki[cdst->mc_top];
}
}
}
/* Update the parent separators.
*/
if (csrc->mc_ki[csrc->mc_top] == 0) {
@ -4657,6 +4862,7 @@ mdb_page_merge(MDB_cursor *csrc, MDB_cursor *cdst)
indx_t i, j;
MDB_node *srcnode;
MDB_val key, data;
unsigned nkeys;
DPRINTF("merging page %zu into %zu", csrc->mc_pg[csrc->mc_top]->mp_pgno,
cdst->mc_pg[cdst->mc_top]->mp_pgno);
@ -4670,7 +4876,7 @@ mdb_page_merge(MDB_cursor *csrc, MDB_cursor *cdst)
/* Move all nodes from src to dst.
*/
j = NUMKEYS(cdst->mc_pg[cdst->mc_top]);
j = nkeys = NUMKEYS(cdst->mc_pg[cdst->mc_top]);
if (IS_LEAF2(csrc->mc_pg[csrc->mc_top])) {
key.mv_size = csrc->mc_db->md_pad;
key.mv_data = METADATA(csrc->mc_pg[csrc->mc_top]);
@ -4711,6 +4917,26 @@ mdb_page_merge(MDB_cursor *csrc, MDB_cursor *cdst)
csrc->mc_db->md_leaf_pages--;
else
csrc->mc_db->md_branch_pages--;
{
/* Adjust other cursors pointing to mp */
MDB_cursor *m2, *m3;
MDB_dbi dbi = csrc->mc_dbi;
MDB_page *mp = cdst->mc_pg[cdst->mc_top];
if (csrc->mc_flags & C_SUB)
dbi--;
for (m2 = csrc->mc_txn->mt_cursors[dbi]; m2; m2=m2->mc_next) {
if (csrc->mc_flags & C_SUB)
m3 = &m2->mc_xcursor->mx_cursor;
else
m3 = m2;
if (m3->mc_pg[csrc->mc_top] == csrc->mc_pg[csrc->mc_top]) {
m3->mc_pg[csrc->mc_top] = mp;
m3->mc_ki[csrc->mc_top] += nkeys;
}
}
}
mdb_cursor_pop(csrc);
return mdb_rebalance(csrc);
@ -4763,22 +4989,61 @@ mdb_rebalance(MDB_cursor *mc)
}
if (mc->mc_snum < 2) {
if (NUMKEYS(mc->mc_pg[mc->mc_top]) == 0) {
MDB_page *mp = mc->mc_pg[0];
if (NUMKEYS(mp) == 0) {
DPUTS("tree is completely empty");
mc->mc_db->md_root = P_INVALID;
mc->mc_db->md_depth = 0;
mc->mc_db->md_leaf_pages = 0;
mdb_midl_append(&mc->mc_txn->mt_free_pgs, mc->mc_pg[mc->mc_top]->mp_pgno);
mdb_midl_append(&mc->mc_txn->mt_free_pgs, mp->mp_pgno);
mc->mc_snum = 0;
} else if (IS_BRANCH(mc->mc_pg[mc->mc_top]) && NUMKEYS(mc->mc_pg[mc->mc_top]) == 1) {
mc->mc_top = 0;
{
/* Adjust other cursors pointing to mp */
MDB_cursor *m2, *m3;
MDB_dbi dbi = mc->mc_dbi;
if (mc->mc_flags & C_SUB)
dbi--;
for (m2 = mc->mc_txn->mt_cursors[dbi]; m2; m2=m2->mc_next) {
if (mc->mc_flags & C_SUB)
m3 = &m2->mc_xcursor->mx_cursor;
else
m3 = m2;
if (m3->mc_pg[0] == mp) {
m3->mc_snum = 0;
m3->mc_top = 0;
}
}
}
} else if (IS_BRANCH(mp) && NUMKEYS(mp) == 1) {
DPUTS("collapsing root page!");
mdb_midl_append(&mc->mc_txn->mt_free_pgs, mc->mc_pg[mc->mc_top]->mp_pgno);
mc->mc_db->md_root = NODEPGNO(NODEPTR(mc->mc_pg[mc->mc_top], 0));
mdb_midl_append(&mc->mc_txn->mt_free_pgs, mp->mp_pgno);
mc->mc_db->md_root = NODEPGNO(NODEPTR(mp, 0));
if ((rc = mdb_page_get(mc->mc_txn, mc->mc_db->md_root,
&mc->mc_pg[mc->mc_top])))
&mc->mc_pg[0])))
return rc;
mc->mc_db->md_depth--;
mc->mc_db->md_branch_pages--;
{
/* Adjust other cursors pointing to mp */
MDB_cursor *m2, *m3;
MDB_dbi dbi = mc->mc_dbi;
if (mc->mc_flags & C_SUB)
dbi--;
for (m2 = mc->mc_txn->mt_cursors[dbi]; m2; m2=m2->mc_next) {
if (mc->mc_flags & C_SUB)
m3 = &m2->mc_xcursor->mx_cursor;
else
m3 = m2;
if (m3->mc_pg[0] == mp) {
m3->mc_pg[0] = mc->mc_pg[0];
}
}
}
} else
DPUTS("root page doesn't need rebalancing");
return MDB_SUCCESS;
@ -4925,7 +5190,7 @@ static int
mdb_page_split(MDB_cursor *mc, MDB_val *newkey, MDB_val *newdata, pgno_t newpgno)
{
uint8_t flags;
int rc = MDB_SUCCESS, ins_new = 0;
int rc = MDB_SUCCESS, ins_new = 0, new_root = 0;
indx_t newindx;
pgno_t pgno = 0;
unsigned int i, j, split_indx, nkeys, pmax;
@ -4955,6 +5220,7 @@ mdb_page_split(MDB_cursor *mc, MDB_val *newkey, MDB_val *newdata, pgno_t newpgno
mc->mc_db->md_root = pp->mp_pgno;
DPRINTF("root split! new root = %zu", pp->mp_pgno);
mc->mc_db->md_depth++;
new_root = 1;
/* Add left (implicit) pointer. */
if ((rc = mdb_node_add(mc, 0, NULL, NULL, mp->mp_pgno, 0)) != MDB_SUCCESS) {
@ -5102,12 +5368,12 @@ newsep:
rc = mdb_node_add(&mn, mn.mc_ki[ptop], &sepkey, NULL, rp->mp_pgno, 0);
mn.mc_top++;
}
if (IS_LEAF2(rp)) {
return rc;
}
if (rc != MDB_SUCCESS) {
return rc;
}
if (IS_LEAF2(rp)) {
goto done;
}
/* Move half of the keys to the right sibling. */
@ -5183,6 +5449,39 @@ newsep:
/* return tmp page to freelist */
copy->mp_next = mc->mc_txn->mt_env->me_dpages;
mc->mc_txn->mt_env->me_dpages = copy;
done:
{
/* Adjust other cursors pointing to mp */
MDB_cursor *m2, *m3;
MDB_dbi dbi = mc->mc_dbi;
if (mc->mc_flags & C_SUB)
dbi--;
for (m2 = mc->mc_txn->mt_cursors[dbi]; m2; m2=m2->mc_next) {
if (mc->mc_flags & C_SUB)
m3 = &m2->mc_xcursor->mx_cursor;
else
m3 = m2;
if (new_root) {
/* root split */
for (i=m3->mc_top; i>0; i--) {
m3->mc_ki[i+1] = m3->mc_ki[i];
m3->mc_pg[i+1] = m3->mc_pg[i];
}
m3->mc_ki[0] = mc->mc_ki[0];
m3->mc_pg[0] = mc->mc_pg[0];
m3->mc_snum++;
m3->mc_top++;
}
if (m3->mc_pg[mc->mc_top] == mp) {
if (m3->mc_ki[m3->mc_top] >= split_indx) {
m3->mc_pg[m3->mc_top] = rp;
m3->mc_ki[m3->mc_top] -= split_indx;
}
}
}
}
return rc;
}

3
libraries/libmdb/mdb.h
View File

@ -843,9 +843,6 @@ void mdb_cursor_close(MDB_cursor *cursor);
* case of the #MDB_SET option, in which the \b key object is unchanged), and
* the address and length of the data are returned in the object to which \b data
* refers.
* @bug Cursors are not coordinated with write operations. If a cursor in a
* write transaction is performing a sequential scan while records are being
* inserted or deleted in the same transaction, the cursor will be corrupted.
* @param[in] cursor A cursor handle returned by #mdb_cursor_open()
* @param[in,out] key The key for a retrieved item
* @param[in,out] data The data of a retrieved item