1621934eeSPaul E. McKenney /* 2621934eeSPaul E. McKenney * Sleepable Read-Copy Update mechanism for mutual exclusion 3621934eeSPaul E. McKenney * 4621934eeSPaul E. McKenney * This program is free software; you can redistribute it and/or modify 5621934eeSPaul E. McKenney * it under the terms of the GNU General Public License as published by 6621934eeSPaul E. McKenney * the Free Software Foundation; either version 2 of the License, or 7621934eeSPaul E. McKenney * (at your option) any later version. 8621934eeSPaul E. McKenney * 9621934eeSPaul E. McKenney * This program is distributed in the hope that it will be useful, 10621934eeSPaul E. McKenney * but WITHOUT ANY WARRANTY; without even the implied warranty of 11621934eeSPaul E. McKenney * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12621934eeSPaul E. McKenney * GNU General Public License for more details. 13621934eeSPaul E. McKenney * 14621934eeSPaul E. McKenney * You should have received a copy of the GNU General Public License 15621934eeSPaul E. McKenney * along with this program; if not, write to the Free Software 16621934eeSPaul E. McKenney * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 17621934eeSPaul E. McKenney * 18621934eeSPaul E. McKenney * Copyright (C) IBM Corporation, 2006 19621934eeSPaul E. McKenney * 20621934eeSPaul E. McKenney * Author: Paul McKenney <[email protected]> 21621934eeSPaul E. McKenney * 22621934eeSPaul E. McKenney * For detailed explanation of Read-Copy Update mechanism see - 23621934eeSPaul E. McKenney * Documentation/RCU/ *.txt 24621934eeSPaul E. McKenney * 25621934eeSPaul E. McKenney */ 26621934eeSPaul E. McKenney 27eabc0694SAlan Stern #ifndef _LINUX_SRCU_H 28eabc0694SAlan Stern #define _LINUX_SRCU_H 29eabc0694SAlan Stern 30621934eeSPaul E. McKenney struct srcu_struct_array { 31621934eeSPaul E. McKenney int c[2]; 32621934eeSPaul E. McKenney }; 33621934eeSPaul E. McKenney 34621934eeSPaul E. McKenney struct srcu_struct { 35621934eeSPaul E. McKenney int completed; 36*43cf38ebSTejun Heo struct srcu_struct_array __percpu *per_cpu_ref; 37621934eeSPaul E. McKenney struct mutex mutex; 38621934eeSPaul E. McKenney }; 39621934eeSPaul E. McKenney 40621934eeSPaul E. McKenney #ifndef CONFIG_PREEMPT 41621934eeSPaul E. McKenney #define srcu_barrier() barrier() 42621934eeSPaul E. McKenney #else /* #ifndef CONFIG_PREEMPT */ 43621934eeSPaul E. McKenney #define srcu_barrier() 44621934eeSPaul E. McKenney #endif /* #else #ifndef CONFIG_PREEMPT */ 45621934eeSPaul E. McKenney 46e6a92013SAlan Stern int init_srcu_struct(struct srcu_struct *sp); 47621934eeSPaul E. McKenney void cleanup_srcu_struct(struct srcu_struct *sp); 48621934eeSPaul E. McKenney int srcu_read_lock(struct srcu_struct *sp) __acquires(sp); 49621934eeSPaul E. McKenney void srcu_read_unlock(struct srcu_struct *sp, int idx) __releases(sp); 50621934eeSPaul E. McKenney void synchronize_srcu(struct srcu_struct *sp); 510cd397d3SPaul E. McKenney void synchronize_srcu_expedited(struct srcu_struct *sp); 52621934eeSPaul E. McKenney long srcu_batches_completed(struct srcu_struct *sp); 53eabc0694SAlan Stern 54eabc0694SAlan Stern #endif 55