Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Read-Copy Update mechanism for mutual exclusion (tree-based version) |
| 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 IBM Corporation, 2008 |
| 19 | * |
| 20 | * Author: Dipankar Sarma <dipankar@in.ibm.com> |
| 21 | * Paul E. McKenney <paulmck@linux.vnet.ibm.com> Hierarchical algorithm |
| 22 | * |
| 23 | * Based on the original work by Paul McKenney <paulmck@us.ibm.com> |
| 24 | * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen. |
| 25 | * |
| 26 | * For detailed explanation of Read-Copy Update mechanism see - |
Paul E. McKenney | a71fca5 | 2009-09-18 10:28:19 -0700 | [diff] [blame] | 27 | * Documentation/RCU |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 28 | */ |
| 29 | |
| 30 | #ifndef __LINUX_RCUTREE_H |
| 31 | #define __LINUX_RCUTREE_H |
| 32 | |
Paul E. McKenney | b2c0710 | 2010-09-09 13:40:39 -0700 | [diff] [blame] | 33 | extern void rcu_init(void); |
Paul E. McKenney | 25502a6 | 2010-04-01 17:37:01 -0700 | [diff] [blame] | 34 | extern void rcu_note_context_switch(int cpu); |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 35 | extern int rcu_needs_cpu(int cpu); |
Paul E. McKenney | 53d84e0 | 2010-08-10 14:28:53 -0700 | [diff] [blame] | 36 | extern void rcu_cpu_stall_reset(void); |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 37 | |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 38 | #ifdef CONFIG_TREE_PREEMPT_RCU |
| 39 | |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 40 | extern void exit_rcu(void); |
| 41 | |
| 42 | #else /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
| 43 | |
Paul E. McKenney | f41d911 | 2009-08-22 13:56:52 -0700 | [diff] [blame] | 44 | static inline void exit_rcu(void) |
| 45 | { |
| 46 | } |
| 47 | |
| 48 | #endif /* #else #ifdef CONFIG_TREE_PREEMPT_RCU */ |
| 49 | |
Paul E. McKenney | da848c4 | 2010-03-30 15:46:01 -0700 | [diff] [blame] | 50 | extern void synchronize_rcu_bh(void); |
Lai Jiangshan | 7b27d54 | 2010-10-21 11:29:05 +0800 | [diff] [blame^] | 51 | extern void synchronize_sched_expedited(void); |
Paul E. McKenney | 019129d5 | 2009-10-14 10:15:56 -0700 | [diff] [blame] | 52 | extern void synchronize_rcu_expedited(void); |
Paul E. McKenney | 03b042b | 2009-06-25 09:08:16 -0700 | [diff] [blame] | 53 | |
| 54 | static inline void synchronize_rcu_bh_expedited(void) |
| 55 | { |
| 56 | synchronize_sched_expedited(); |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 57 | } |
| 58 | |
Paul E. McKenney | a57eb94 | 2010-06-29 16:49:16 -0700 | [diff] [blame] | 59 | extern void rcu_barrier(void); |
| 60 | |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 61 | extern long rcu_batches_completed(void); |
| 62 | extern long rcu_batches_completed_bh(void); |
Paul E. McKenney | d6714c2 | 2009-08-22 13:56:46 -0700 | [diff] [blame] | 63 | extern long rcu_batches_completed_sched(void); |
Paul E. McKenney | bf66f18 | 2010-01-04 15:09:10 -0800 | [diff] [blame] | 64 | extern void rcu_force_quiescent_state(void); |
| 65 | extern void rcu_bh_force_quiescent_state(void); |
| 66 | extern void rcu_sched_force_quiescent_state(void); |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 67 | |
Paul E. McKenney | 1eba8f8 | 2009-09-23 09:50:42 -0700 | [diff] [blame] | 68 | /* A context switch is a grace period for RCU-sched and RCU-bh. */ |
Paul E. McKenney | a682604 | 2009-02-25 18:03:42 -0800 | [diff] [blame] | 69 | static inline int rcu_blocking_is_gp(void) |
| 70 | { |
| 71 | return num_online_cpus() == 1; |
| 72 | } |
| 73 | |
Paul E. McKenney | bbad937 | 2010-04-02 16:17:17 -0700 | [diff] [blame] | 74 | extern void rcu_scheduler_starting(void); |
| 75 | extern int rcu_scheduler_active __read_mostly; |
| 76 | |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 77 | #endif /* __LINUX_RCUTREE_H */ |