git://bbs.cooldavid.org / net-next-2.6.git / blame
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|---|---|---|
| 64db4cff PM |
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 - | |
| a71fca58 | 27 | * Documentation/RCU |
| 64db4cff PM |
28 | */ |
| 29 | ||
| 30 | #ifndef __LINUX_RCUTREE_H | |
| 31 | #define __LINUX_RCUTREE_H | |
| 32 | ||
| 25502a6c | 33 | extern void rcu_note_context_switch(int cpu); |
| 64db4cff | 34 | extern int rcu_needs_cpu(int cpu); |
| 53d84e00 | 35 | extern void rcu_cpu_stall_reset(void); |
| 64db4cff | 36 | |
| f41d911f PM |
37 | #ifdef CONFIG_TREE_PREEMPT_RCU |
| 38 | ||
| f41d911f PM |
39 | extern void exit_rcu(void); |
| 40 | ||
| 41 | #else /* #ifdef CONFIG_TREE_PREEMPT_RCU */ | |
| 42 | ||
| f41d911f PM |
43 | static inline void exit_rcu(void) |
| 44 | { | |
| 45 | } | |
| 46 | ||
| 47 | #endif /* #else #ifdef CONFIG_TREE_PREEMPT_RCU */ | |
| 48 | ||
| da848c47 | 49 | extern void synchronize_rcu_bh(void); |
| 019129d5 | 50 | extern void synchronize_rcu_expedited(void); |
| 03b042bf PM |
51 | |
| 52 | static inline void synchronize_rcu_bh_expedited(void) | |
| 64db4cff | 53 | { |
| 03b042bf | 54 | synchronize_sched_expedited(); |
| 64db4cff PM |
55 | } |
| 56 | ||
| a57eb940 PM |
57 | extern void rcu_barrier(void); |
| 58 | ||
| 64db4cff PM |
59 | extern long rcu_batches_completed(void); |
| 60 | extern long rcu_batches_completed_bh(void); | |
| d6714c22 | 61 | extern long rcu_batches_completed_sched(void); |
| bf66f18e PM |
62 | extern void rcu_force_quiescent_state(void); |
| 63 | extern void rcu_bh_force_quiescent_state(void); | |
| 64 | extern void rcu_sched_force_quiescent_state(void); | |
| 64db4cff | 65 | |
| 1eba8f84 | 66 | /* A context switch is a grace period for RCU-sched and RCU-bh. */ |
| a6826048 PM |
67 | static inline int rcu_blocking_is_gp(void) |
| 68 | { | |
| 69 | return num_online_cpus() == 1; | |
| 70 | } | |
| 71 | ||
| bbad9379 PM |
72 | extern void rcu_scheduler_starting(void); |
| 73 | extern int rcu_scheduler_active __read_mostly; | |
| 74 | ||
| 64db4cff | 75 | #endif /* __LINUX_RCUTREE_H */ |