Re: pthread library related

[Charles Cui <charles.cui1984%gmail.com@localhost>]

good to know atomic_inc_uint_nv is implemented using cas.
I will update the patch and send you guys later (being careful about the
format)

Thanks Charles

2016-05-30 13:46 GMT-07:00 Christos Zoulas <christos%zoulas.com@localhost>:

> On May 30,  1:43pm, charles.cui1984%gmail.com@localhost (Charles Cui) wrote:
> -- Subject: Re: pthread library related
>
> | I am not familiar with _nv() (are there examples in the netbsd code
> base? I
> | searched _nv() in nxr, but did not found anything meaningful.),
> | but if you want to use atomic operations, one possible way is
> | compare-and-swap (CAS).
> | it has stronger guarantee than atomic inc or atomic dec, but also larger
> | overhead.
>
> man atomic_inc_uint_nv
>
> http://nxr.netbsd.org/xref/src/sys/fs/tmpfs/tmpfs_mem.c#185
>
> christos
>