Messages in this thread | | | Date | Wed, 14 Dec 2005 22:17:55 +1100 | From | Nick Piggin <> | Subject | Re: [PATCH 1/19] MUTEX: Introduce simple mutex implementation |
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David Howells wrote: > Nick Piggin <nickpiggin@yahoo.com.au> wrote: > > >>atomic_cmpxchg should be available on all platforms. > > > Two points: > > (1) If it's using spinlocks, then it's pointless to use atomic_cmpxchg. >
Why?
> (2) atomic_t is a 32-bit type, and on a 64-bit platform I will want a 64-bit > type so that I can stick the owner address in there (I've got a second > variant not yet released). >
I'm sure you could use a seperate field as it would be a debug option, right?
But atomic longs are coming along and it is probably feasable to do 64-bit atomic_cmpxchg on all 64-bit word architectures if you really needed that.
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