#define FLOCK(f) int __need_unlock = ((f)->lock>=0 ? __lockfile((f)) : 0)
#define FUNLOCK(f) if (__need_unlock) __unlockfile((f)); else
#define FLOCK(f) int __need_unlock = ((f)->lock>=0 ? __lockfile((f)) : 0)
#define FUNLOCK(f) if (__need_unlock) __unlockfile((f)); else