Date: Tue, 7 Apr 2009 10:24:07 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-current@freebsd.org Cc: Luigi Rizzo <rizzo@iet.unipi.it> Subject: Re: missing atomic_exchg_*() in the atomic.h API ? Message-ID: <200904071024.07805.jhb@freebsd.org> In-Reply-To: <20090406083238.GB3358@onelab2.iet.unipi.it> References: <20090406083238.GB3358@onelab2.iet.unipi.it>
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On Monday 06 April 2009 4:32:38 am Luigi Rizzo wrote: > while looking at the functions in atomic.h i noticed that > there seems to be no atomic_exchg_*() in the API, though this > is a supported function in most/all supported archiectures, > and a useful function. We do have atomic_readandclear() which > uses the same underlying CPU instruction. > > Again, any objection if i add it ? Mostly b/c there hasn't been a need for it to date. I would probably spell out 'exchange' btw. -- John Baldwin
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