gcc/libgcc/config/nvptx/reduction.c

/* Oversized reductions lock  variable
   Copyright (C) 2015-2022 Free Software Foundation, Inc.
   Contributed by Mentor Graphics.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
<http://www.gnu.org/licenses/>.  */


/* We use a global lock variable for reductions on objects larger than
   64 bits.  Until and unless proven that lock contention for
   different reduction is a problem, a single lock will suffice.  */

unsigned volatile __reduction_lock = 0;