mirror of https://gitee.com/openkylin/linux.git
93 lines
2.7 KiB
C
93 lines
2.7 KiB
C
/*
|
|
* Read-Copy Update mechanism for mutual exclusion (tree-based version)
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*
|
|
* Copyright IBM Corporation, 2008
|
|
*
|
|
* Author: Dipankar Sarma <dipankar@in.ibm.com>
|
|
* Paul E. McKenney <paulmck@linux.vnet.ibm.com> Hierarchical algorithm
|
|
*
|
|
* Based on the original work by Paul McKenney <paulmck@us.ibm.com>
|
|
* and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen.
|
|
*
|
|
* For detailed explanation of Read-Copy Update mechanism see -
|
|
* Documentation/RCU
|
|
*/
|
|
|
|
#ifndef __LINUX_RCUTREE_H
|
|
#define __LINUX_RCUTREE_H
|
|
|
|
extern void rcu_init(void);
|
|
extern void rcu_note_context_switch(int cpu);
|
|
extern int rcu_needs_cpu(int cpu);
|
|
extern void rcu_cpu_stall_reset(void);
|
|
|
|
/*
|
|
* Note a virtualization-based context switch. This is simply a
|
|
* wrapper around rcu_note_context_switch(), which allows TINY_RCU
|
|
* to save a few bytes.
|
|
*/
|
|
static inline void rcu_virt_note_context_switch(int cpu)
|
|
{
|
|
rcu_note_context_switch(cpu);
|
|
}
|
|
|
|
#ifdef CONFIG_TREE_PREEMPT_RCU
|
|
|
|
extern void exit_rcu(void);
|
|
|
|
#else /* #ifdef CONFIG_TREE_PREEMPT_RCU */
|
|
|
|
static inline void exit_rcu(void)
|
|
{
|
|
}
|
|
|
|
#endif /* #else #ifdef CONFIG_TREE_PREEMPT_RCU */
|
|
|
|
extern void synchronize_rcu_bh(void);
|
|
extern void synchronize_sched_expedited(void);
|
|
extern void synchronize_rcu_expedited(void);
|
|
|
|
static inline void synchronize_rcu_bh_expedited(void)
|
|
{
|
|
synchronize_sched_expedited();
|
|
}
|
|
|
|
extern void rcu_barrier(void);
|
|
extern void rcu_barrier_bh(void);
|
|
extern void rcu_barrier_sched(void);
|
|
|
|
extern unsigned long rcutorture_testseq;
|
|
extern unsigned long rcutorture_vernum;
|
|
extern long rcu_batches_completed(void);
|
|
extern long rcu_batches_completed_bh(void);
|
|
extern long rcu_batches_completed_sched(void);
|
|
|
|
extern void rcu_force_quiescent_state(void);
|
|
extern void rcu_bh_force_quiescent_state(void);
|
|
extern void rcu_sched_force_quiescent_state(void);
|
|
|
|
/* A context switch is a grace period for RCU-sched and RCU-bh. */
|
|
static inline int rcu_blocking_is_gp(void)
|
|
{
|
|
return num_online_cpus() == 1;
|
|
}
|
|
|
|
extern void rcu_scheduler_starting(void);
|
|
extern int rcu_scheduler_active __read_mostly;
|
|
|
|
#endif /* __LINUX_RCUTREE_H */
|