* Btree into the list of all sharable Btrees for the same
* connection. The list is kept in ascending order by pBt address.
*/
if (this.sharable) {
for (final ISqlJetBackend backend : db.getBackends()) {
final ISqlJetBtree btree = backend.getBtree();
if (btree == null || !(btree instanceof SqlJetBtree))
continue;
SqlJetBtree pSib = (SqlJetBtree) btree;
if (pSib.sharable) {
while (pSib.pPrev != null) {