Messages in this thread | | | Subject | Re: What does atomic_read actually do? | From | Arjan van de Ven <> | Date | Sat, 18 Dec 2004 20:54:40 +0100 |
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On Sat, 2004-12-18 at 14:20 -0500, Joseph Seigh wrote: > I mean atomic in the either old or new sense. I'm wondering what > guarantees > the atomicity. Not the C standard. I can see the gcc compiler uses a MOV > instruction to load the atomic_t from memory which is guaranteed atomic by > the architecture if aligned properly. But gcc does that for any old int > as far as I can see, so why use atomic_read?
it does so on *x86*. On other architectures, something else might be needed..
also it makes the api more symetric as well.
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