rw_enter
err = rw_enter(&sc->ioctl_rwl, RW_WRITE | RW_INTR);
err = rw_enter(&sc->ioctl_rwl, RW_WRITE | RW_INTR);
error = rw_enter(&sc->sc_rwlock, RW_WRITE | RW_INTR);
#define os_rwl_rlock(lock) rw_enter(lock, RW_READER);
#define os_rwl_wlock(lock) rw_enter(lock, RW_WRITER);
return rw_enter(rwl, RW_WRITE);
#define os_rwl_rlock(lock) rw_enter(lock, RW_READER);
#define os_rwl_wlock(lock) rw_enter(lock, RW_WRITER);