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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [libgomp/] [config/] [linux/] [bar.h] - Rev 288
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/* Copyright (C) 2005, 2008, 2009 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 a Linux specific implementation of a barrier synchronization mechanism for libgomp. This type is private to the library. This implementation uses atomic instructions and the futex syscall. */ #ifndef GOMP_BARRIER_H #define GOMP_BARRIER_H 1 #include "mutex.h" typedef struct { /* Make sure total/generation is in a mostly read cacheline, while awaited in a separate cacheline. */ unsigned total __attribute__((aligned (64))); unsigned generation; unsigned awaited __attribute__((aligned (64))); } gomp_barrier_t; typedef unsigned int gomp_barrier_state_t; static inline void gomp_barrier_init (gomp_barrier_t *bar, unsigned count) { bar->total = count; bar->awaited = count; bar->generation = 0; } static inline void gomp_barrier_reinit (gomp_barrier_t *bar, unsigned count) { __sync_fetch_and_add (&bar->awaited, count - bar->total); bar->total = count; } static inline void gomp_barrier_destroy (gomp_barrier_t *bar) { } extern void gomp_barrier_wait (gomp_barrier_t *); extern void gomp_barrier_wait_last (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 = bar->generation & ~3; /* Do we need any barrier here or is __sync_add_and_fetch acting as the needed LoadLoad barrier already? */ ret += __sync_add_and_fetch (&bar->awaited, -1) == 0; return ret; } static inline bool gomp_barrier_last_thread (gomp_barrier_state_t state) { return state & 1; } /* 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 */
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