63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
/* Copyright (C) 2015-2022 Free Software Foundation, Inc.
|
|
Contributed by Jakub Jelinek <jakub@redhat.com>.
|
|
|
|
This file is part of the GNU Offloading and Multi Processing Library
|
|
(libgomp).
|
|
|
|
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
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
/* This is a generic implementation of doacross spinning. */
|
|
|
|
#ifndef GOMP_DOACROSS_H
|
|
#define GOMP_DOACROSS_H 1
|
|
|
|
#include "libgomp.h"
|
|
#include <errno.h>
|
|
|
|
#ifdef HAVE_ATTRIBUTE_VISIBILITY
|
|
# pragma GCC visibility push(hidden)
|
|
#endif
|
|
|
|
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. */
|
|
do
|
|
{
|
|
cpu_relax ();
|
|
cur = __atomic_load_n (addr, MEMMODEL_RELAXED);
|
|
if (expected < cur)
|
|
return;
|
|
}
|
|
while (1);
|
|
}
|
|
|
|
#ifdef HAVE_ATTRIBUTE_VISIBILITY
|
|
# pragma GCC visibility pop
|
|
#endif
|
|
|
|
#endif /* GOMP_DOACROSS_H */
|