Having experienced the somewhat convenient and easy to use locking
interface in Solaris, I tried to create a set of macros that bring
that functionality to NetBSD.

I managed to make some progress, but started bumping my head against
things in NetBSD...anyone care to add some enlightenment ?  There are
holes which can't be filled but I've applied putty to try stop leaks.

Darren

/*
 * Solaris compatible interface.
 */
typedef	struct	simplelock	kmutex_t;

#define	MUTEX_ADAPTIVE		LK_RECURSEFAIL
#define	MUTEX_SPIN		LK_SPIN|LK_RECURSEFAIL
#define	MUTEX_DRIVER		LK_RECURSEFAIL
#define	MUTEX_DEFAULT		LK_RECURSEFAIL

#define	MUTEX_HELD(x)
#define	MUTEX_NOT_HELD(x)

#define	mutex_init(mp, name, type, arg)	spinlockinit(mp, name, arg)
#define	mutex_destroy(mp)
#define	mutex_enter(mp)			simple_lock(mp)
#define	mutex_exit(mp)			simple_unlock(mp)
#define	mutex_owned(mp)			simple_lock_held(mp)
#define	mutex_tryenter(mp)		simple_lock_try(mp)

typedef	struct	lock		krwlock_t;

#define	RW_READER			LK_SHARED
#define	RW_WRITER			LK_EXCLUSIVE
#define	RW_DRIVER			LK_SPIN
#define	RW_DEFAULT			LK_SPIN

#define	RW_READ_HELD(x)			(lockstatus(rwlp) == LK_SHARED)
#define	RW_WRITE_HELD(x)		(lockstatus(rwlp) == LK_EXCLUSIVE)
#define	RW_LOCK_HELD(x)			(lockstatus(rwlp) == LK_SHARED)
#define	RW_ISWRITER(x)			(lockstatus(rwlp) == LK_SHARED)

#define	rw_init(rwlp, name, type, arg)	lockinit(rwlp,
#define	rw_destroy(rwlp)
#define	rw_enter(rwlp, type)		lockmgr(rwlp)
#define	rw_exit(rwlp)			lockmgr(rwlp, type)
#define	rw_tryenter(rwlp, type)		lockmgr(rwlp, LK_RELEASE)
#define	rw_downgrade(rwlp)		lockmgr(rwlp, LK_DOWNGRADE)
#define	rw_tryupgrade(rwlp)		lockmgr(rwlp, LK_UPGRADE)
#define	rw_read_locked(rwlp)		(lockstatus(rwlp) == LK_SHARED)