Re: atomic reference counting primatives.

From: John Baldwin (jhb_at_FreeBSD.org)
Date: 05/24/04

  • Next message: Robert Watson: "Re: Network Stack Locking" 
    To: Daniel Eischen <eischen@vigrid.com>
Date: Mon, 24 May 2004 14:59:04 -0400

    On Monday 24 May 2004 10:50 am, Daniel Eischen wrote:
    > On Mon, 24 May 2004, John Baldwin wrote:
    > > atomic_cmpset() is an "official" primitive. The problem is that Mike is
    > > using an enum and assuming that all enum's are ints which is not
    > > necessarily true. The code should perhaps use an int with #define's
    > > instead to guarantee that the variable is an int and not a short, char,
    > > or long.
    >
    > You can't use atomic_cmpset() in userland on 386, so
    > if it is being used in libthr, the machine must be
    > checked to make sure it will work, otherwise should
    > fall back to something else...

    I'd be fine with it being a compile option to be honest. We already don't
    support 80386's out of the box since they need a custom kernel. I'd rather
    not pessimize world + dog for the 80386. 

    -- 
John Baldwin <jhb@FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org
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