Paul E. McKenney | 621934e | 2006-10-04 02:17:02 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Sleepable Read-Copy Update mechanism for mutual exclusion |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | * |
| 18 | * Copyright (C) IBM Corporation, 2006 |
| 19 | * |
| 20 | * Author: Paul McKenney <paulmck@us.ibm.com> |
| 21 | * |
| 22 | * For detailed explanation of Read-Copy Update mechanism see - |
| 23 | * Documentation/RCU/ *.txt |
| 24 | * |
| 25 | */ |
| 26 | |
Alan Stern | eabc069 | 2006-10-04 02:17:04 -0700 | [diff] [blame] | 27 | #ifndef _LINUX_SRCU_H |
| 28 | #define _LINUX_SRCU_H |
| 29 | |
Paul E. McKenney | 621934e | 2006-10-04 02:17:02 -0700 | [diff] [blame] | 30 | struct srcu_struct_array { |
| 31 | int c[2]; |
| 32 | }; |
| 33 | |
| 34 | struct srcu_struct { |
| 35 | int completed; |
| 36 | struct srcu_struct_array *per_cpu_ref; |
| 37 | struct mutex mutex; |
| 38 | }; |
| 39 | |
| 40 | #ifndef CONFIG_PREEMPT |
| 41 | #define srcu_barrier() barrier() |
| 42 | #else /* #ifndef CONFIG_PREEMPT */ |
| 43 | #define srcu_barrier() |
| 44 | #endif /* #else #ifndef CONFIG_PREEMPT */ |
| 45 | |
Alan Stern | e6a9201 | 2006-10-04 02:17:05 -0700 | [diff] [blame] | 46 | int init_srcu_struct(struct srcu_struct *sp); |
Paul E. McKenney | 621934e | 2006-10-04 02:17:02 -0700 | [diff] [blame] | 47 | void cleanup_srcu_struct(struct srcu_struct *sp); |
| 48 | int srcu_read_lock(struct srcu_struct *sp) __acquires(sp); |
| 49 | void srcu_read_unlock(struct srcu_struct *sp, int idx) __releases(sp); |
| 50 | void synchronize_srcu(struct srcu_struct *sp); |
Paul E. McKenney | 0cd397d | 2009-10-25 19:03:51 -0700 | [diff] [blame] | 51 | void synchronize_srcu_expedited(struct srcu_struct *sp); |
Paul E. McKenney | 621934e | 2006-10-04 02:17:02 -0700 | [diff] [blame] | 52 | long srcu_batches_completed(struct srcu_struct *sp); |
Alan Stern | eabc069 | 2006-10-04 02:17:04 -0700 | [diff] [blame] | 53 | |
| 54 | #endif |