NOT_BLOCKED
if (NOT_BLOCKED(request)) {
ASSERT(NOT_BLOCKED(request));
ASSERT(NOT_BLOCKED(lock));
if (NOT_BLOCKED(lck)) {
ASSERT(NOT_BLOCKED(lock));
ASSERT(!NOT_BLOCKED(ep->from_vertex));
ASSERT(!NOT_BLOCKED(lock1));
ASSERT(!NOT_BLOCKED(lock1));