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1 | /* |
2 | * Read-Copy Update mechanism for mutual exclusion (RT implementation) | |
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 | * Based on the original work by Paul McKenney <paul.mckenney@us.ibm.com> | |
23 | * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen. | |
24 | * Papers: | |
25 | * http://www.rdrop.com/users/paulmck/paper/rclockpdcsproof.pdf | |
26 | * http://lse.sourceforge.net/locking/rclock_OLS.2001.05.01c.sc.pdf (OLS2001) | |
27 | * | |
28 | * For detailed explanation of Read-Copy Update mechanism see - | |
29 | * Documentation/RCU | |
30 | * | |
31 | */ | |
32 | ||
33 | #ifndef __LINUX_RCUPREEMPT_H | |
34 | #define __LINUX_RCUPREEMPT_H | |
35 | ||
36 | #ifdef __KERNEL__ | |
37 | ||
38 | #include <linux/cache.h> | |
39 | #include <linux/spinlock.h> | |
40 | #include <linux/threads.h> | |
41 | #include <linux/percpu.h> | |
42 | #include <linux/cpumask.h> | |
43 | #include <linux/seqlock.h> | |
44 | ||
45 | #define rcu_qsctr_inc(cpu) | |
46 | #define rcu_bh_qsctr_inc(cpu) | |
47 | #define call_rcu_bh(head, rcu) call_rcu(head, rcu) | |
48 | ||
49 | extern void __rcu_read_lock(void); | |
50 | extern void __rcu_read_unlock(void); | |
51 | extern int rcu_pending(int cpu); | |
52 | extern int rcu_needs_cpu(int cpu); | |
53 | ||
54 | #define __rcu_read_lock_bh() { rcu_read_lock(); local_bh_disable(); } | |
55 | #define __rcu_read_unlock_bh() { local_bh_enable(); rcu_read_unlock(); } | |
56 | ||
57 | extern void __synchronize_sched(void); | |
58 | ||
59 | extern void __rcu_init(void); | |
60 | extern void rcu_check_callbacks(int cpu, int user); | |
61 | extern void rcu_restart_cpu(int cpu); | |
62 | extern long rcu_batches_completed(void); | |
63 | ||
64 | /* | |
65 | * Return the number of RCU batches processed thus far. Useful for debug | |
66 | * and statistic. The _bh variant is identifcal to straight RCU | |
67 | */ | |
68 | static inline long rcu_batches_completed_bh(void) | |
69 | { | |
70 | return rcu_batches_completed(); | |
71 | } | |
72 | ||
73 | #ifdef CONFIG_RCU_TRACE | |
74 | struct rcupreempt_trace; | |
75 | extern long *rcupreempt_flipctr(int cpu); | |
76 | extern long rcupreempt_data_completed(void); | |
77 | extern int rcupreempt_flip_flag(int cpu); | |
78 | extern int rcupreempt_mb_flag(int cpu); | |
79 | extern char *rcupreempt_try_flip_state_name(void); | |
80 | extern struct rcupreempt_trace *rcupreempt_trace_cpu(int cpu); | |
81 | #endif | |
82 | ||
83 | struct softirq_action; | |
84 | ||
85 | #endif /* __KERNEL__ */ | |
86 | #endif /* __LINUX_RCUPREEMPT_H */ |