Messages in this thread | | | Date | Thu, 28 Dec 2000 13:06:59 +0100 (MET) | From | "Maciej W. Rozycki" <> | Subject | Re: sysmips call and glibc atomic set |
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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 +
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