LK_RELEASE
#define os_rwl_unlock(lock) lockmgr(lock, LK_RELEASE)
#define os_mtx_unlock(lock) lockmgr(lock, LK_RELEASE)
lockmgr(&(pmp)->pm_fatlock, LK_RELEASE, NULL)
if ((flags & LK_RELEASE) != 0) {
lockmgr(vp->v_vnlock, LK_RELEASE, NULL);
#define os_rwl_unlock(lock) lockmgr(lock, LK_RELEASE)
#define os_mtx_unlock(lock) lockmgr(lock, LK_RELEASE)