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1 | #ifndef _LINUX_SEM_H | |
2 | #define _LINUX_SEM_H | |
3 | ||
4 | #include <linux/atomic.h> | |
5 | #include <linux/rcupdate.h> | |
6 | #include <linux/cache.h> | |
7 | #include <uapi/linux/sem.h> | |
8 | ||
9 | struct task_struct; | |
10 | ||
11 | /* One sem_array data structure for each set of semaphores in the system. */ | |
12 | struct sem_array { | |
13 | struct kern_ipc_perm ____cacheline_aligned_in_smp | |
14 | sem_perm; /* permissions .. see ipc.h */ | |
15 | time_t sem_ctime; /* last change time */ | |
16 | struct sem *sem_base; /* ptr to first semaphore in array */ | |
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 */ | |
21 | struct list_head list_id; /* undo requests on this array */ | |
22 | int sem_nsems; /* no. of semaphores in array */ | |
23 | int complex_count; /* pending complex operations */ | |
24 | }; | |
25 | ||
26 | #ifdef CONFIG_SYSVIPC | |
27 | ||
28 | struct sysv_sem { | |
29 | struct sem_undo_list *undo_list; | |
30 | }; | |
31 | ||
32 | extern int copy_semundo(unsigned long clone_flags, struct task_struct *tsk); | |
33 | extern void exit_sem(struct task_struct *tsk); | |
34 | ||
35 | #else | |
36 | ||
37 | struct sysv_sem { | |
38 | /* empty */ | |
39 | }; | |
40 | ||
41 | static inline int copy_semundo(unsigned long clone_flags, struct task_struct *tsk) | |
42 | { | |
43 | return 0; | |
44 | } | |
45 | ||
46 | static inline void exit_sem(struct task_struct *tsk) | |
47 | { | |
48 | return; | |
49 | } | |
50 | #endif | |
51 | ||
52 | #endif /* _LINUX_SEM_H */ |