77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
/* Copyright (C) 2005-2021 Free Software Foundation, Inc.
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Contributed by Sebastian Huber <sebastian.huber@embedded-brains.de>.
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This file is part of the GNU OpenMP Library (libgomp).
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Libgomp is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* This is the RTEMS implementation of a barrier synchronization
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mechanism for libgomp. It is identical to the Linux implementation, except
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that the futex API is slightly different. This type is private to the
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library. */
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#include "libgomp.h"
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#include "bar.h"
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#include <limits.h>
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static gomp_barrier_t *
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generation_to_barrier (int *addr)
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{
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return (gomp_barrier_t *)
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((char *) addr - __builtin_offsetof (gomp_barrier_t, generation));
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}
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static void
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futex_wait (int *addr, int val)
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{
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gomp_barrier_t *bar = generation_to_barrier (addr);
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_Futex_Wait (&bar->futex, addr, val);
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}
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static void
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futex_wake (int *addr, int count)
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{
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gomp_barrier_t *bar = generation_to_barrier (addr);
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_Futex_Wake (&bar->futex, count);
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}
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static int
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do_spin (int *addr, int val)
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{
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unsigned long long i, count = gomp_spin_count_var;
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if (__builtin_expect (gomp_managed_threads > gomp_available_cpus, 0))
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count = gomp_throttled_spin_count_var;
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for (i = 0; i < count; i++)
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if (__builtin_expect (__atomic_load_n (addr, MEMMODEL_RELAXED) != val, 0))
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return 0;
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return 1;
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}
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static void
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do_wait (int *addr, int val)
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{
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if (do_spin (addr, val))
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futex_wait (addr, val);
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}
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#define GOMP_WAIT_H 1
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#include "../linux/bar.c"
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