Line data Source code
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 : #ifndef _LINUX_SRCU_H
28 : #define _LINUX_SRCU_H
29 :
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 :
46 : int init_srcu_struct(struct srcu_struct *sp);
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);
51 : void synchronize_srcu_expedited(struct srcu_struct *sp);
52 : long srcu_batches_completed(struct srcu_struct *sp);
53 1 :
54 : #endif
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