Merge tag 'for-linus-20160523' of git://git.infradead.org/linux-mtd
[linux-2.6-block.git] / include / linux / sem.h
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1#ifndef _LINUX_SEM_H
2#define _LINUX_SEM_H
3
60063497 4#include <linux/atomic.h>
380af1b3 5#include <linux/rcupdate.h>
31a7c474 6#include <linux/cache.h>
607ca46e 7#include <uapi/linux/sem.h>
1da177e4 8
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9struct task_struct;
10
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11/* One sem_array data structure for each set of semaphores in the system. */
12struct sem_array {
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13 struct kern_ipc_perm ____cacheline_aligned_in_smp
14 sem_perm; /* permissions .. see ipc.h */
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15 time_t sem_ctime; /* last change time */
16 struct sem *sem_base; /* ptr to first semaphore in array */
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17 struct list_head pending_alter; /* pending operations */
18 /* that alter the array */
19 struct list_head pending_const; /* pending complex operations */
20 /* that do not alter semvals */
4daa28f6 21 struct list_head list_id; /* undo requests on this array */
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22 int sem_nsems; /* no. of semaphores in array */
23 int complex_count; /* pending complex operations */
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24};
25
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26#ifdef CONFIG_SYSVIPC
27
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28struct sysv_sem {
29 struct sem_undo_list *undo_list;
30};
31
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32extern int copy_semundo(unsigned long clone_flags, struct task_struct *tsk);
33extern void exit_sem(struct task_struct *tsk);
34
35#else
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36
37struct sysv_sem {
38 /* empty */
39};
40
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41static inline int copy_semundo(unsigned long clone_flags, struct task_struct *tsk)
42{
43 return 0;
44}
45
46static inline void exit_sem(struct task_struct *tsk)
47{
48 return;
49}
50#endif
51
1da177e4 52#endif /* _LINUX_SEM_H */