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- /* Copyright (C) 2005-2022 Free Software Foundation, Inc.
- Contributed by Sebastian Huber <sebastian.huber@embedded-brains.de>.
- This file is part of the GNU OpenMP 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 the RTEMS implementation of a barrier synchronization
- mechanism for libgomp. It is identical to the Linux implementation, except
- that the futex API is slightly different. This type is private to the
- library. */
- #include "libgomp.h"
- #include "bar.h"
- #include <limits.h>
- static gomp_barrier_t *
- generation_to_barrier (int *addr)
- {
- return (gomp_barrier_t *)
- ((char *) addr - __builtin_offsetof (gomp_barrier_t, generation));
- }
- static void
- futex_wait (int *addr, int val)
- {
- gomp_barrier_t *bar = generation_to_barrier (addr);
- _Futex_Wait (&bar->futex, addr, val);
- }
- static void
- futex_wake (int *addr, int count)
- {
- gomp_barrier_t *bar = generation_to_barrier (addr);
- _Futex_Wake (&bar->futex, count);
- }
- static int
- do_spin (int *addr, int val)
- {
- unsigned long long i, count = gomp_spin_count_var;
- if (__builtin_expect (gomp_managed_threads > gomp_available_cpus, 0))
- count = gomp_throttled_spin_count_var;
- for (i = 0; i < count; i++)
- if (__builtin_expect (__atomic_load_n (addr, MEMMODEL_RELAXED) != val, 0))
- return 0;
- return 1;
- }
- static void
- do_wait (int *addr, int val)
- {
- if (do_spin (addr, val))
- futex_wait (addr, val);
- }
- #define GOMP_WAIT_H 1
- #include "../linux/bar.c"
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