> I think that using a bitwise flag (use_timeout) could eventually
> also improve performance because when the timeout expire we don' t
> need to set to 0 a 64 bit memory area on 64bit arch. I am not 100%
> sure though ;-).
>
>On most RISC machines, bitfield extract/store is implemented as word
^^^^
I guess that there are not asm instruction for bitwise memory accesses.
Word means 32 or 64 bit (->timeout is a 64 bit memory area)? I have no
cross compier to check the output asm here.
>memory operations with the bit twiddle in the register. This is
>actually specified by the ABI, sparc64 and alpha do this for example.
ABI ??
Andrea Arcangeli
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