Re: C11 threads

[Szabolcs Nagy <nsz@port70.net>]

* Jens Gustedt <jens.gustedt@inria.fr> [2014-07-25 13:06:44 +0200]:
> Am Freitag, den 25.07.2014, 12:40 +0200 schrieb Szabolcs Nagy:
> > * Jens Gustedt <jens.gustedt@inria.fr> [2014-07-25 12:00:37 +0200]:
> > > /* Best of all worlds, these are just weak aliases */
> > > int cnd_broadcast(cnd_t *);                   // pthread_cond_broadcast
> > 
> > posix is not yet aligned with c11, but i think they will
> > require inequal function pointers for these functions
> 
> The term "inequal function pointer" had nothing pop up. Could you give
> a reference to the relevant part in POSIX that makes the requirement
> for a "strong" symbol?


hm i might be wrong:

there is a requirement in c and posix that the address of a
standard function can be taken and that == is only true for
function pointers if they point to the same function

but i don't see any requirement that each library function
must be distinct

and there is a dr that implies the opposite:

http://www.open-std.org/jtc1/sc22/wg14/www/docs/dr_078.html

without explanation the response says h can return 0.

the musl math library currently defines distinct long double
functions even if long double and double have the same
representation, they could be weak aliases if the standard
allows this..