To:        J3                                      11-176
From:      Bill Long
Subject:   Coarray TR place holder
Date: 2011 June 09
Reference: J3/10-166, WG5/N1835, J3/09-184

A subordinate agenda item for this meeting (after completing the
Interop TR) is to resume work on the Coarray TR. While I do not expect
major progress on the Coarray TR at this meeting, there are two
features that are important in the near term because of pressure to
have implementations delivered.

1) At the WG5 meeting in May, 2009 (Las Vegas) paper J3/09-184
proposing an atomic compare-and-swap (ATOMIC_CAS) was considered and
deferred to the TR. This, along with the other standard atomic
operations are of significant interest. The complete list is in
WG5/N1835, Proposal 2.

2) Numerous users have lamented the lack of collectives operations for
coarrays. The current list in the TR draft is a duplication of the
list of reduction functions in legacy Fortran.  This is almost
universally seen as the wrong set of functions for coarrays, and needs
to be replaced. See WG5/N1835, Proposal 1, for more details.

The main purpose of this paper is as a place holder to get a meeting
paper number.  I will rebuild J3/10-166 changing only the name to
match this paper number and the dates to create a base document for
this meeting. Separate papers to address the issues above will follow.