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- /* 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 */
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