(j3.2006) 16-126

Craig Dedo CAPM craig
Tue Jan 26 21:58:28 EST 2016


            Why did we prohibit mixing Asynchronous I/O and User-Defined Derived Type I/O
(UDDTIO)?  In a private conversation with Richard Bleikamp, the main author of the UDDTIO
feature, I asked him this very question.  His answer was very simple and straightforward.
He said, "Because it's too damned hard!  I have no idea how we would implement such a


            Please feel free to contact me at any time with any questions or concerns that
you may have.  I am looking forward to hearing from you soon.



Craig T. Dedo, CAPM

17130 W. Burleigh Place

P. O. Box 423                         Mobile Phone:  (414) 412-5869

Brookfield, WI   53008-0423    E-mail:  < <mailto:craig at ctdedo.com> craig at ctdedo.com>


Linked-In:   <http://www.linkedin.com/in/craigdedo> http://www.linkedin.com/in/craigdedo

> -----Original Message-----

> From: j3-bounces at mailman.j3-fortran.org [mailto:j3-bounces at mailman.j3-fortran.org]

> On Behalf Of Bill Long

> Sent: Tuesday, January 26, 2016 14:06

> To: Van Snyder; fortran standards email list for J3

> Subject: Re: (j3.2006) 16-126



> On Jan 26, 2016, at 1:43 PM, Van Snyder < <mailto:Van.Snyder at jpl.nasa.gov>
Van.Snyder at jpl.nasa.gov> wrote:


> > On Tue, 2016-01-26 at 19:36 +0000, Bill Long wrote:

> >> Paper 16-126 on mixing defined I/O and asynchronous I/O seems to have

> >> missed this restriction:  "Neither a parent nor child data transfer

> >> statement shall be asynchronous."

> >

> > Good catch.  One less interp to worry about.

> >

> > But why did we do that?  There's no harm in it?


> It is probably too big of a hammer.  For example, defined I/O for a file opened for

> read only, and asynchronous, is not too hard to handle.  Of course, you can always

> do the I/O directly, not using defined I/O procedures, and it works fine.  But I

> imagine that OOP programmers would prefer type-bound defined I/O.


> Cheers,

> Bill





> Bill Long

>  <mailto:longb at cray.com> longb at cray.com

> Fortran Technical Support  &                                  voice:  651-605-9024

> Bioinformatics Software Development                     fax:  651-605-9142

> Cray Inc./ Cray Plaza, Suite 210/ 380 Jackson St./ St. Paul, MN 55101



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