2016-08-20 0:21 GMT+08:00 Waiman Long <waiman.long@xxxxxxx>: > On 08/19/2016 01:57 AM, Wanpeng Li wrote: >> >> 2016-08-19 5:11 GMT+08:00 Waiman Long<Waiman.Long@xxxxxxx>: >>> >>> When the count value is in between 0 and RWSEM_WAITING_BIAS, there >>> are 2 possibilities. >>> Either a writer is present and there is no waiter >> >> count = 0xffff0001 >> >>> or there are waiters and readers. There is no easy way to >> >> count = 0xffff000X >> >> However, RWSEM_WAITING_BIAS is equal to 0xffff0000, so both these two >> cases are beyond RWSEM_WAITING_BIAS, right? >> >> Regards, >> Wanpeng Li > > > Perhaps I should make it clear that I am talking from a signed quantity > point of view (it is an atomic_long_t). So > > RWSEM_WAITING_BIAS < RWSEM_ACTIVE_WRITE_BIAS < 0 > > Hope this clarify your question. Yeah, thank you. :) Regards, Wanpeng Li -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
