| /* Copyright (C) 2005-2019 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" |