Re: [patch] SMP alternatives

[H. Peter Anvin]

Daniel Jacobowitz wrote:
> I don't think I see the point.  This would let you optimize for the
> "multi-threaded, but hasn't created any threads yet" or even
> "multi-threaded, but not right now" cases.  But those really aren't the
> interesting case to optimize for - that's the equivalent of supporting
> CPU hotplug.
>
> The interesting case is when you know at static link time that the
> library is single-threaded, or even at dynamic link time.  And it's
> easy enough at both of those times to handle this.  In many cases glibc
> doesn't, because it's valid to dlopen libpthread.so, but that could be
> accomodated - a simple matter of software.

No, you can never know that unless you can't call mmap().

	-hpa
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