On Tue, 26 Dec 2000, Ralf Baechle wrote:
> The semantics of this syscall were previously defined by Risc/OS and later
> on continued to be used by IRIX.
Ralf, could you please provide me a copy of a man page for the call? I
don't have access to either of the systems and a search of the Net
returned nothing.
> Don't think about SMP without ll/sc. There's algorithems available for
> that but their complexity leaves them a unpractical, theoretical construct.
For SMP there is a simple kernel solution available. It suitable for a
syscall or a ll/sc emulation. There is no easy userland-only solution
AFAIK.
> Above code will break if the old content of memory has bit 31 set or you take
> pagefaults. The latter problem is a problem even on UP - think multi-
> threading.
If the code is written carefully you don't ever get a pagefault that
would break consistency.
-- + Maciej W. Rozycki, Technical University of Gdansk, Poland + +--------------------------------------------------------------+ + e-mail: macro@ds2.pg.gda.pl, PGP key available +- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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