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- /* Copyright (C) 2005-2022 Free Software Foundation, Inc.
- Contributed by Richard Henderson <rth@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 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;
- bool cancellable;
- } gomp_barrier_t;
- typedef unsigned int gomp_barrier_state_t;
- /* The generation field contains a counter in the high bits, with a few
- low bits dedicated to flags. Note that TASK_PENDING and WAS_LAST can
- share space because WAS_LAST is never stored back to generation. */
- #define BAR_TASK_PENDING 1
- #define BAR_WAS_LAST 1
- #define BAR_WAITING_FOR_TASK 2
- #define BAR_CANCELLED 4
- #define BAR_INCR 8
- 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 bool gomp_team_barrier_wait_cancel (gomp_barrier_t *);
- extern bool gomp_team_barrier_wait_cancel_end (gomp_barrier_t *,
- gomp_barrier_state_t);
- extern void gomp_team_barrier_wake (gomp_barrier_t *, int);
- struct gomp_team;
- extern void gomp_team_barrier_cancel (struct gomp_team *);
- 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 & (-BAR_INCR | BAR_CANCELLED);
- if (++bar->arrived == bar->total)
- ret |= BAR_WAS_LAST;
- return ret;
- }
- static inline gomp_barrier_state_t
- gomp_barrier_wait_cancel_start (gomp_barrier_t *bar)
- {
- unsigned int ret;
- gomp_mutex_lock (&bar->mutex1);
- ret = bar->generation & (-BAR_INCR | BAR_CANCELLED);
- if (ret & BAR_CANCELLED)
- return ret;
- if (++bar->arrived == bar->total)
- ret |= BAR_WAS_LAST;
- return ret;
- }
- static inline void
- gomp_team_barrier_wait_final (gomp_barrier_t *bar)
- {
- gomp_team_barrier_wait (bar);
- }
- static inline bool
- gomp_barrier_last_thread (gomp_barrier_state_t state)
- {
- return state & BAR_WAS_LAST;
- }
- 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 |= BAR_TASK_PENDING;
- }
- static inline void
- gomp_team_barrier_clear_task_pending (gomp_barrier_t *bar)
- {
- bar->generation &= ~BAR_TASK_PENDING;
- }
- static inline void
- gomp_team_barrier_set_waiting_for_tasks (gomp_barrier_t *bar)
- {
- bar->generation |= BAR_WAITING_FOR_TASK;
- }
- static inline bool
- gomp_team_barrier_waiting_for_tasks (gomp_barrier_t *bar)
- {
- return (bar->generation & BAR_WAITING_FOR_TASK) != 0;
- }
- static inline bool
- gomp_team_barrier_cancelled (gomp_barrier_t *bar)
- {
- return __builtin_expect ((bar->generation & BAR_CANCELLED) != 0, 0);
- }
- static inline void
- gomp_team_barrier_done (gomp_barrier_t *bar, gomp_barrier_state_t state)
- {
- bar->generation = (state & -BAR_INCR) + BAR_INCR;
- }
- #endif /* GOMP_BARRIER_H */
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