/* Fetch and latch next child BIN. */
curBin = (BIN) parent.getTarget(parentIndex);
if (curBin == null) {
fetchOrWait = true;
curBin =
(BIN) parent.fetchTargetWithExclusiveLatch
(parentIndex);
}
if (!curBin.latchNoWait(CacheMode.UNCHANGED)) {
fetchOrWait = true;
curBin.latch();