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/* Copyright (C) 2005-2017 Free Software Foundation, Inc.
Contributed by Richard Henderson <>.
This file is part of the GNU Offloading and Multi Processing Library
Libgomp 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.
Libgomp 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
<>. */
/* This file contains helpers for the ATOMIC construct. */
#include "libgomp.h"
/* This mutex is used when atomic operations don't exist for the target
in the mode requested. The result is not globally atomic, but works so
long as all parallel references are within #pragma omp atomic directives.
According to responses received from, appears to be within
spec. Which makes sense, since that's how several other compilers
handle this situation as well. */
static gomp_mutex_t atomic_lock;
GOMP_atomic_start (void)
gomp_mutex_lock (&atomic_lock);
GOMP_atomic_end (void)
gomp_mutex_unlock (&atomic_lock);
static void __attribute__((constructor))
initialize_atomic (void)
gomp_mutex_init (&atomic_lock);