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1da177e4 LT |
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 | |
8c65b4a6 TS |
9 | struct task_struct; |
10 | ||
1da177e4 LT |
11 | /* One sem_array data structure for each set of semaphores in the system. */ |
12 | struct sem_array { | |
31a7c474 MS |
13 | struct kern_ipc_perm ____cacheline_aligned_in_smp |
14 | sem_perm; /* permissions .. see ipc.h */ | |
1da177e4 LT |
15 | time_t sem_ctime; /* last change time */ |
16 | struct sem *sem_base; /* ptr to first semaphore in array */ | |
1a82e9e1 MS |
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 */ |
b97e820f MS |
22 | int sem_nsems; /* no. of semaphores in array */ |
23 | int complex_count; /* pending complex operations */ | |
5864a2fd | 24 | bool complex_mode; /* no parallel simple ops */ |
1da177e4 LT |
25 | }; |
26 | ||
f567a185 MS |
27 | #ifdef CONFIG_SYSVIPC |
28 | ||
1da177e4 LT |
29 | struct sysv_sem { |
30 | struct sem_undo_list *undo_list; | |
31 | }; | |
32 | ||
1da177e4 LT |
33 | extern int copy_semundo(unsigned long clone_flags, struct task_struct *tsk); |
34 | extern void exit_sem(struct task_struct *tsk); | |
35 | ||
36 | #else | |
f567a185 MS |
37 | |
38 | struct sysv_sem { | |
39 | /* empty */ | |
40 | }; | |
41 | ||
1da177e4 LT |
42 | static inline int copy_semundo(unsigned long clone_flags, struct task_struct *tsk) |
43 | { | |
44 | return 0; | |
45 | } | |
46 | ||
47 | static inline void exit_sem(struct task_struct *tsk) | |
48 | { | |
49 | return; | |
50 | } | |
51 | #endif | |
52 | ||
1da177e4 | 53 | #endif /* _LINUX_SEM_H */ |