SRPL_NEXT_LOCKED
(_c) = SRPL_NEXT_LOCKED((_c), _ENTRY))
(_c) && ((_tc) = SRPL_NEXT_LOCKED(_c, _ENTRY), 1); \
next = SRPL_NEXT_LOCKED(_se, _ENTRY); \
n = SRPL_NEXT_LOCKED(c, _ENTRY); \