| /* Copyright (C) 2005-2013 Free Software Foundation, Inc. |
| Contributed by Richard Henderson <rth@redhat.com>. |
| |
| 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 default implementation of a barrier synchronization mechanism |
| for libgomp. This type is private to the library. Note that we rely on |
| being able to adjust the barrier count while threads are blocked, so the |
| POSIX pthread_barrier_t won't work. */ |
| |
| #ifndef GOMP_BARRIER_H |
| #define GOMP_BARRIER_H 1 |
| |
| #include <pthread.h> |
| |
| typedef struct |
| { |
| gomp_mutex_t mutex1; |
| #ifndef HAVE_SYNC_BUILTINS |
| gomp_mutex_t mutex2; |
| #endif |
| gomp_sem_t sem1; |
| gomp_sem_t sem2; |
| unsigned total; |
| unsigned arrived; |
| unsigned generation; |
| } gomp_barrier_t; |
| typedef unsigned int gomp_barrier_state_t; |
| |
| extern void gomp_barrier_init (gomp_barrier_t *, unsigned); |
| extern void gomp_barrier_reinit (gomp_barrier_t *, unsigned); |
| extern void gomp_barrier_destroy (gomp_barrier_t *); |
| |
| extern void gomp_barrier_wait (gomp_barrier_t *); |
| extern void gomp_barrier_wait_end (gomp_barrier_t *, gomp_barrier_state_t); |
| extern void gomp_team_barrier_wait (gomp_barrier_t *); |
| extern void gomp_team_barrier_wait_end (gomp_barrier_t *, |
| gomp_barrier_state_t); |
| extern void gomp_team_barrier_wake (gomp_barrier_t *, int); |
| |
| static inline gomp_barrier_state_t |
| gomp_barrier_wait_start (gomp_barrier_t *bar) |
| { |
| unsigned int ret; |
| gomp_mutex_lock (&bar->mutex1); |
| ret = bar->generation & ~3; |
| ret += ++bar->arrived == bar->total; |
| return ret; |
| } |
| |
| static inline bool |
| gomp_barrier_last_thread (gomp_barrier_state_t state) |
| { |
| return state & 1; |
| } |
| |
| static inline void |
| gomp_barrier_wait_last (gomp_barrier_t *bar) |
| { |
| gomp_barrier_wait (bar); |
| } |
| |
| /* All the inlines below must be called with team->task_lock |
| held. */ |
| |
| static inline void |
| gomp_team_barrier_set_task_pending (gomp_barrier_t *bar) |
| { |
| bar->generation |= 1; |
| } |
| |
| static inline void |
| gomp_team_barrier_clear_task_pending (gomp_barrier_t *bar) |
| { |
| bar->generation &= ~1; |
| } |
| |
| static inline void |
| gomp_team_barrier_set_waiting_for_tasks (gomp_barrier_t *bar) |
| { |
| bar->generation |= 2; |
| } |
| |
| static inline bool |
| gomp_team_barrier_waiting_for_tasks (gomp_barrier_t *bar) |
| { |
| return (bar->generation & 2) != 0; |
| } |
| |
| static inline void |
| gomp_team_barrier_done (gomp_barrier_t *bar, gomp_barrier_state_t state) |
| { |
| bar->generation = (state & ~3) + 4; |
| } |
| |
| #endif /* GOMP_BARRIER_H */ |