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621934ee PM |
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 | ||
27 | struct srcu_struct_array { | |
28 | int c[2]; | |
29 | }; | |
30 | ||
31 | struct srcu_struct { | |
32 | int completed; | |
33 | struct srcu_struct_array *per_cpu_ref; | |
34 | struct mutex mutex; | |
35 | }; | |
36 | ||
37 | #ifndef CONFIG_PREEMPT | |
38 | #define srcu_barrier() barrier() | |
39 | #else /* #ifndef CONFIG_PREEMPT */ | |
40 | #define srcu_barrier() | |
41 | #endif /* #else #ifndef CONFIG_PREEMPT */ | |
42 | ||
43 | void init_srcu_struct(struct srcu_struct *sp); | |
44 | void cleanup_srcu_struct(struct srcu_struct *sp); | |
45 | int srcu_read_lock(struct srcu_struct *sp) __acquires(sp); | |
46 | void srcu_read_unlock(struct srcu_struct *sp, int idx) __releases(sp); | |
47 | void synchronize_srcu(struct srcu_struct *sp); | |
48 | long srcu_batches_completed(struct srcu_struct *sp); | |
49 | void cleanup_srcu_struct(struct srcu_struct *sp); |