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.
Cheers,
Longman
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