Re: atomic reference counting primatives.

From: Garance A Drosihn (drosih_at_rpi.edu)
Date: 05/22/04

  • Next message: Julian Elischer: "Re: atomic reference counting primatives." 
    Date: Fri, 21 May 2004 20:44:41 -0400
To: Julian Elischer <julian@elischer.org>, arch@freebsd.org

    At 1:56 PM -0700 5/20/04, Julian Elischer wrote:
    >This has been raised before but I have come across uses for
    >it again and again so I'm raising it again. JHB once posted
    >some atomic reference counting primitives. (Do you still have
    >them John?) Alfred once said he had some somewhere too, and
    >others have commented on this before, but we still don't seem
    >to have any.

    Btw, does this thread have anything to do with the present
    buuldworld-breakage for sparc64? I notice the compile-time
    errors are something like:

    /usr/src/lib/libthr/thread/thr_cancel.c: In function `testcancel':
    /usr/src/lib/libthr/thread/thr_cancel.c:123: warning: passing
          arg 1 of `atomic_cmpset_int' from incompatible pointer type

    My guess is that this is related to Mike's change to "Make libthr
    async-signal-safe without costly signal masking. [...etc...]".

    This breakage underlines one reason that it would be mighty
    convenient to have some "official" set of primitives. It is
    one thing if a developer has to roll-their-own solution for
    i386, but somewhat more challenging if that solution has to
    work across a half-dozen different hardware platforms.

    This also suggests that it would be nice if the primitives
    could be written so that if the wrong type-of-parameters are
    given, the compiles will fail on *all* platforms. 

    -- 
Garance Alistair Drosehn            =   gad@gilead.netel.rpi.edu
Senior Systems Programmer           or  gad@freebsd.org
Rensselaer Polytechnic Institute    or  drosih@rpi.edu
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  • Next message: Julian Elischer: "Re: atomic reference counting primatives."