projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 <[email protected]> | |
| 21 | * Paul E. McKenney <[email protected]> Hierarchical algorithm | |
| 22 | * | |
| 23 | * Based on the original work by Paul McKenney <[email protected]> | |
| 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 | ||
| b2c0710c | 33 | extern void rcu_init(void); |
| 25502a6c | 34 | extern void rcu_note_context_switch(int cpu); |
| 64db4cff | 35 | extern int rcu_needs_cpu(int cpu); |
| 53d84e00 | 36 | extern void rcu_cpu_stall_reset(void); |
| 64db4cff | 37 | |
| 29ce8310 GN |
38 | /* |
| 39 | * Note a virtualization-based context switch. This is simply a | |
| 40 | * wrapper around rcu_note_context_switch(), which allows TINY_RCU | |
| 41 | * to save a few bytes. | |
| 42 | */ | |
| 43 | static inline void rcu_virt_note_context_switch(int cpu) | |
| 44 | { | |
| 45 | rcu_note_context_switch(cpu); | |
| 46 | } | |
| 47 | ||
| f41d911f PM |
48 | #ifdef CONFIG_TREE_PREEMPT_RCU |
| 49 | ||
| f41d911f PM |
50 | extern void exit_rcu(void); |
| 51 | ||
| 52 | #else /* #ifdef CONFIG_TREE_PREEMPT_RCU */ | |
| 53 | ||
| f41d911f PM |
54 | static inline void exit_rcu(void) |
| 55 | { | |
| 56 | } | |
| 57 | ||
| 58 | #endif /* #else #ifdef CONFIG_TREE_PREEMPT_RCU */ | |
| 59 | ||
| da848c47 | 60 | extern void synchronize_rcu_bh(void); |
| 7b27d547 | 61 | extern void synchronize_sched_expedited(void); |
| 019129d5 | 62 | extern void synchronize_rcu_expedited(void); |
| 03b042bf PM |
63 | |
| 64 | static inline void synchronize_rcu_bh_expedited(void) | |
| 64db4cff | 65 | { |
| 03b042bf | 66 | synchronize_sched_expedited(); |
| 64db4cff PM |
67 | } |
| 68 | ||
| a57eb940 PM |
69 | extern void rcu_barrier(void); |
| 70 | ||
| 4a298656 PM |
71 | extern unsigned long rcutorture_testseq; |
| 72 | extern unsigned long rcutorture_vernum; | |
| 64db4cff PM |
73 | extern long rcu_batches_completed(void); |
| 74 | extern long rcu_batches_completed_bh(void); | |
| d6714c22 | 75 | extern long rcu_batches_completed_sched(void); |
| 4a298656 | 76 | |
| bf66f18e PM |
77 | extern void rcu_force_quiescent_state(void); |
| 78 | extern void rcu_bh_force_quiescent_state(void); | |
| 79 | extern void rcu_sched_force_quiescent_state(void); | |
| 64db4cff | 80 | |
| 1eba8f84 | 81 | /* A context switch is a grace period for RCU-sched and RCU-bh. */ |
| a6826048 PM |
82 | static inline int rcu_blocking_is_gp(void) |
| 83 | { | |
| 84 | return num_online_cpus() == 1; | |
| 85 | } | |
| 86 | ||
| bbad9379 PM |
87 | extern void rcu_scheduler_starting(void); |
| 88 | extern int rcu_scheduler_active __read_mostly; | |
| 89 | ||
| 64db4cff | 90 | #endif /* __LINUX_RCUTREE_H */ |