Robert Haas wrote:
> On Wed, Oct 8, 2014 at 8:47 AM, Andres Freund <andres@2ndquadrant.com> wrote:
> > I don't see that as being relevant. The difference is an instruction or
> > two - in the slow path we'll enter the kernel and sleep. This doesn't
> > matter in comparison.
> > And the code is *so* much more readable.
>
> I find the slist/dlist stuff actually quite difficult to get right
> compared to a hand-rolled linked list. But the really big problem is
> that the debugger can't do anything useful with it. You have to work
> out the structure-member offset in order to walk the list and manually
> cast to char *, adjust the pointer, and cast back. That sucks.
As far as I recall you can get gdb to understand those pointer games
by defining some structs or macros. Maybe we can improve by documenting
this.
--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
