Nick Piggin wrote:
Roman Zippel wrote:
Hi,
On Thu, 15 Sep 2005, Nick Piggin wrote:
Also needs work on those same architectures. Other architectures
might want to look at providing a more optimal implementation.
IMO a rather pointless primitive, unless there is a cpu architecture
which has a inc_not_zero instruction, otherwise it will always be the
same as using cmpxchg.
[snip]
But even supposing the cmpxchg variant was the highest
performing implementation available on any architecture, I
would still consider exporting the inc_not_zero instruction.
The reason is that cmpxchg is not nearly so readable as
inc_not_zero when used inline in the code.
--
SUSE Labs, Novell Inc.
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