Gitiles
Code Review Sign In
gerrit-public.fairphone.software / kernel / msm-5.4 / 29dee3c03abce04cd527878ef5f9e5f91b7b83f4 / . / include / linux / refcount.h
blob: 0e8cfb2ce91e7e6d109023e4483780c3bd4e6694 [file] [log] [blame]
Peter Zijlstraf405df52016-11-14 18:06:19 +0100[diff] [blame]1#ifndef _LINUX_REFCOUNT_H
2#define _LINUX_REFCOUNT_H
3
Peter Zijlstraf405df52016-11-14 18:06:19 +0100[diff] [blame]4#include <linux/atomic.h>
Peter Zijlstraf405df52016-11-14 18:06:19 +0100[diff] [blame]5#include <linux/mutex.h>
6#include <linux/spinlock.h>
7
Peter Zijlstraf405df52016-11-14 18:06:19 +0100[diff] [blame]8typedef struct refcount_struct {
9 atomic_t refs;
10} refcount_t;
11
12#define REFCOUNT_INIT(n) { .refs = ATOMIC_INIT(n), }
13
14static inline void refcount_set(refcount_t *r, unsigned int n)
15{
16 atomic_set(&r->refs, n);
17}
18
19static inline unsigned int refcount_read(const refcount_t *r)
20{
21 return atomic_read(&r->refs);
22}
23
Peter Zijlstra29dee3c2017-02-10 16:27:52 +0100[diff] [blame^]24extern __must_check bool refcount_add_not_zero(unsigned int i, refcount_t *r);
25extern void refcount_add(unsigned int i, refcount_t *r);
Peter Zijlstraf405df52016-11-14 18:06:19 +0100[diff] [blame]26
Peter Zijlstra29dee3c2017-02-10 16:27:52 +0100[diff] [blame^]27extern __must_check bool refcount_inc_not_zero(refcount_t *r);
28extern void refcount_inc(refcount_t *r);
Peter Zijlstraf405df52016-11-14 18:06:19 +0100[diff] [blame]29
Peter Zijlstra29dee3c2017-02-10 16:27:52 +0100[diff] [blame^]30extern __must_check bool refcount_sub_and_test(unsigned int i, refcount_t *r);
31extern void refcount_sub(unsigned int i, refcount_t *r);
Peter Zijlstraf405df52016-11-14 18:06:19 +0100[diff] [blame]32
Peter Zijlstra29dee3c2017-02-10 16:27:52 +0100[diff] [blame^]33extern __must_check bool refcount_dec_and_test(refcount_t *r);
34extern void refcount_dec(refcount_t *r);
Peter Zijlstraf405df52016-11-14 18:06:19 +0100[diff] [blame]35
Peter Zijlstra29dee3c2017-02-10 16:27:52 +0100[diff] [blame^]36extern __must_check bool refcount_dec_if_one(refcount_t *r);
37extern __must_check bool refcount_dec_not_one(refcount_t *r);
38extern __must_check bool refcount_dec_and_mutex_lock(refcount_t *r, struct mutex *lock);
39extern __must_check bool refcount_dec_and_lock(refcount_t *r, spinlock_t *lock);
Peter Zijlstraf405df52016-11-14 18:06:19 +0100[diff] [blame]40
41#endif /* _LINUX_REFCOUNT_H */