root/include/linux/percpu-rwsem.h

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INCLUDED FROM

#ifndef _LINUX_PERCPU_RWSEM_H
#define _LINUX_PERCPU_RWSEM_H

#include <linux/atomic.h>
#include <linux/rwsem.h>
#include <linux/percpu.h>
#include <linux/wait.h>
#include <linux/lockdep.h>

struct percpu_rw_semaphore {
        unsigned int __percpu   *fast_read_ctr;
        atomic_t                write_ctr;
        struct rw_semaphore     rw_sem;
        atomic_t                slow_read_ctr;
        wait_queue_head_t       write_waitq;
};

extern void percpu_down_read(struct percpu_rw_semaphore *);
extern void percpu_up_read(struct percpu_rw_semaphore *);

extern void percpu_down_write(struct percpu_rw_semaphore *);
extern void percpu_up_write(struct percpu_rw_semaphore *);

extern int __percpu_init_rwsem(struct percpu_rw_semaphore *,
                                const char *, struct lock_class_key *);
extern void percpu_free_rwsem(struct percpu_rw_semaphore *);

#define percpu_init_rwsem(brw)  \
({                                                              \
        static struct lock_class_key rwsem_key;                 \
        __percpu_init_rwsem(brw, #brw, &rwsem_key);             \
})

#endif
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