On Mon, Feb 06, 2017 at 12:24:28PM +0800, Boqun Feng wrote:
> On Fri, Feb 03, 2017 at 02:26:02PM +0100, Peter Zijlstra wrote:
> >
> > for (;;) {
> > new = val $op $imm;
> > if (try_cmpxchg(ptr, &val, new))
> > break;
> > }
> >
> > while also ge
On Mon, Feb 06, 2017 at 12:24:28PM +0800, Boqun Feng wrote:
> On Fri, Feb 03, 2017 at 02:26:02PM +0100, Peter Zijlstra wrote:
> > Add a new cmpxchg interface:
> >
> > bool try_cmpxchg(u{8,16,32,64} *ptr, u{8,16,32,64} *val, u{8,16,32,64}
> > new);
> >
> > Where the boolean returns the result o
On Fri, Feb 03, 2017 at 02:26:02PM +0100, Peter Zijlstra wrote:
> Add a new cmpxchg interface:
>
> bool try_cmpxchg(u{8,16,32,64} *ptr, u{8,16,32,64} *val, u{8,16,32,64} new);
>
> Where the boolean returns the result of the compare; and thus if the
> exchange happened; and in case of failure, t
Add a new cmpxchg interface:
bool try_cmpxchg(u{8,16,32,64} *ptr, u{8,16,32,64} *val, u{8,16,32,64} new);
Where the boolean returns the result of the compare; and thus if the
exchange happened; and in case of failure, the new value of *ptr is
returned in *val.
This allows simplification/improv
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