To: J3                                                          11-251r1
From: Van Snyder
Subject: DIN4: edits to PDTR 29113
Date: 2011 October 12
Reference: WG5/N1869, WG5/N1882

Discussion from DIN 4
---------------------

For specification of callback routines in the MPI-3 interface, it is
considered desirable to allow noninteroperable procedure arguments
in BIND(C) interfaces. By way of functionality, this would provide
the analogous facility as the descriptorless TYPE(*) does for data.
The syntax could be very simple: It would be sufficient to allow
specifying the EXTERNAL attribute for a procedure dummy argument in
a BIND(C) interface. Furthermore, a rule would be needed that if
the actual procedure argument is not interoperable, it is not
allowed to invoke the procedure from C; if the actual procedure is
interoperable, an invocation from C is permitted.

Edits
-----

[29113:11 5.1 subclause heading]
Replace "and C_LOC" with ", C_LOC and C_FUNLOC".

[29113:11 5.1 after paragraph 2, insert a paragraph]
"The function C_FUNLOC from the intrinsic module ISO_C_BINDING has the
restriction that its argument shall be interoperable."

[29113:31 6.9 between edits for 15.2.3.3 and 15.2.3.6 insert edits for
15.2.3.5]
"{In 15.2.3.5 paragraph 3 delete 'that is interoperable' and replace
'associated with an interoperable procedure' with 'associated with a
procedure'."

[29113:31 6.9 edits for {At the end of clause 15}]
Replace editing instructions with "{Before subclause 15.5}".

[29113:31 end of 6.9 insert additional edit]
"In subclause 15.5.1 paragraph 4 append a sentence 'A C function shall
not invoke a Fortran procedure that is not interoperable.'"