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34 lines
927 B
34 lines
927 B
#ifndef _LINUX_PERCPU_RWSEM_H
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#define _LINUX_PERCPU_RWSEM_H
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#include <linux/atomic.h>
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#include <linux/rwsem.h>
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#include <linux/percpu.h>
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#include <linux/wait.h>
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#include <linux/lockdep.h>
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struct percpu_rw_semaphore {
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unsigned int __percpu *fast_read_ctr;
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atomic_t write_ctr;
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struct rw_semaphore rw_sem;
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atomic_t slow_read_ctr;
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wait_queue_head_t write_waitq;
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};
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extern void percpu_down_read(struct percpu_rw_semaphore *);
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extern void percpu_up_read(struct percpu_rw_semaphore *);
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extern void percpu_down_write(struct percpu_rw_semaphore *);
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extern void percpu_up_write(struct percpu_rw_semaphore *);
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extern int __percpu_init_rwsem(struct percpu_rw_semaphore *,
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const char *, struct lock_class_key *);
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extern void percpu_free_rwsem(struct percpu_rw_semaphore *);
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#define percpu_init_rwsem(brw) \
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({ \
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static struct lock_class_key rwsem_key; \
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__percpu_init_rwsem(brw, #brw, &rwsem_key); \
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})
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#endif
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