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/*

 * Sleepable Read-Copy Update mechanism for mutual exclusion

 *

 * 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 (C) IBM Corporation, 2006

 *

 * Author: Paul McKenney <paulmck@us.ibm.com>

 *

 * For detailed explanation of Read-Copy Update mechanism see -

 *              Documentation/RCU/ *.txt

 *

 */

#ifndef _LINUX_SRCU_H

#define _LINUX_SRCU_H

struct srcu_struct_array {

        int c[2];

};

struct srcu_struct {

        int completed;

        struct srcu_struct_array *per_cpu_ref;

        struct mutex mutex;

};

#ifndef CONFIG_PREEMPT

#define srcu_barrier() barrier()

#else /* #ifndef CONFIG_PREEMPT */

#define srcu_barrier()

#endif /* #else #ifndef CONFIG_PREEMPT */

int init_srcu_struct(struct srcu_struct *sp);

void cleanup_srcu_struct(struct srcu_struct *sp);

int srcu_read_lock(struct srcu_struct *sp) __acquires(sp);

void srcu_read_unlock(struct srcu_struct *sp, int idx) __releases(sp);

void synchronize_srcu(struct srcu_struct *sp);

long srcu_batches_completed(struct srcu_struct *sp);

#endif