[tz] Thread-safe localtime(3) (was Re: Reading binary files)

John Haxby john.haxby at oracle.com
Thu Nov 3 08:59:16 UTC 2011

On 02/11/11 21:58, Garrett Wollman wrote:
> I would very much like to see this happen.  The only quibble I would
> make with Christos's proposed API is that, because C does not have
> incomplete typedefs, a new foo_t type should not be introduced.  Using
> such typedefs creates undesirable ordering dependencies between
> headers (not a problem for the Implementation but definitely a problem
> for applications if they want to minimize namespace pollution).  Using
> an incomplete structure type has all the benefits of a typedef and
> none of the drawbacks.  If the proposal is adopted by either C or
> POSIX, they will ignore the drawbacks and create a new _t type anyway,
> but since they have joint custody of the "_t" namespace, they can at
> least guarantee that it's defined in an official system header as
> well.

Isn't this an incomplete typedef?

    typedef struct _timezone_opaque_t *timezone_t;

It's a typedef for an incomplete structure, I know, but there's
precedent for this kind of thing.


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