Merge branch 'for_linus' of git://cavan.codon.org.uk/platform-drivers-x86
[platform/adaptation/renesas_rcar/renesas_kernel.git] / include / linux / sem.h
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 */