blob: 4765d97dcafb98a5e8fde93684f9293c08d88804 [file] [log] [blame]
Paul E. McKenney621934e2006-10-04 02:17:02 -07001/*
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
Alan Sterneabc0692006-10-04 02:17:04 -070027#ifndef _LINUX_SRCU_H
28#define _LINUX_SRCU_H
29
Paul E. McKenney621934e2006-10-04 02:17:02 -070030struct srcu_struct_array {
31 int c[2];
32};
33
34struct 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
Alan Sterne6a92012006-10-04 02:17:05 -070046int init_srcu_struct(struct srcu_struct *sp);
Paul E. McKenney621934e2006-10-04 02:17:02 -070047void cleanup_srcu_struct(struct srcu_struct *sp);
48int srcu_read_lock(struct srcu_struct *sp) __acquires(sp);
49void srcu_read_unlock(struct srcu_struct *sp, int idx) __releases(sp);
50void synchronize_srcu(struct srcu_struct *sp);
Paul E. McKenney0cd397d2009-10-25 19:03:51 -070051void synchronize_srcu_expedited(struct srcu_struct *sp);
Paul E. McKenney621934e2006-10-04 02:17:02 -070052long srcu_batches_completed(struct srcu_struct *sp);
Alan Sterneabc0692006-10-04 02:17:04 -070053
54#endif