#define F_FLOCK 0x020 /* Use flock(2) semantics for lock */
#define F_POSIX 0x040 /* Use POSIX semantics for lock */
#define F_PROV 0x080 /* Non-coelesced provisional lock */
+#define F_WAKE1_SAFE 0x100 /* its safe to only wake one waiter */
#endif
/*