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 +
