** Reply to message from "Petr Vandrovec" <[EMAIL PROTECTED]> on Tue, 19 Jun
2001 01:36:26 MET-1
> No. Another CPU might increment value between LOCK INCL and
> fetching v->counter. On ia32 architecture you are almost out of
> luck. You can either try building atomic_inc around CMPXCHG,
> using it as conditional store (but CMPXCHG is not available
> on i386), or you can just guard your atomic variable with
> spinlock - but in that case there is no reason for using atomic_t
> at all.
Oh, I see the problem. You could do something like this:
cli
mov %0, %%eax
inc %%eax
mov %%eax, %0
sti
and then return eax, but that won't work on SMP (whereas the "lock inc" does).
Doing a global cli might work, though.
--
Timur Tabi - [EMAIL PROTECTED]
Interactive Silicon - http://www.interactivesi.com
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