blob: 5dfdbb0fd2d49d20bfc2a1537495d06622e86f05 [file] [log] [blame]
/* Copyright (C) 2015-2021 Free Software Foundation, Inc.
Contributed by Jakub Jelinek <>.
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 is a generic implementation of doacross spinning. */
#include "libgomp.h"
#include <errno.h>
# pragma GCC visibility push(hidden)
static inline void
cpu_relax (void)
__asm volatile ("" : : : "memory");
static inline void doacross_spin (unsigned long *addr, unsigned long expected,
unsigned long cur)
/* FIXME: back off depending on how large expected - cur is. */
cpu_relax ();
cur = __atomic_load_n (addr, MEMMODEL_RELAXED);
if (expected < cur)
while (1);
# pragma GCC visibility pop
#endif /* GOMP_DOACROSS_H */