Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
9struct task_struct;
10
11/* One sem_array data structure for each set of semaphores in the system. */
12struct sem_array {
13 struct kern_ipc_perm ____cacheline_aligned_in_smp
14 sem_perm; /* permissions .. see ipc.h */
15 time_t sem_otime; /* last semop time */
16 time_t sem_ctime; /* last change time */
17 struct sem *sem_base; /* ptr to first semaphore in array */
18 struct list_head sem_pending; /* pending operations to be processed */
19 struct list_head list_id; /* undo requests on this array */
20 int sem_nsems; /* no. of semaphores in array */
21 int complex_count; /* pending complex operations */
22};
23
24#ifdef CONFIG_SYSVIPC
25
26struct sysv_sem {
27 struct sem_undo_list *undo_list;
28};
29
30extern int copy_semundo(unsigned long clone_flags, struct task_struct *tsk);
31extern void exit_sem(struct task_struct *tsk);
32
33#else
34
35struct sysv_sem {
36 /* empty */
37};
38
39static inline int copy_semundo(unsigned long clone_flags, struct task_struct *tsk)
40{
41 return 0;
42}
43
44static inline void exit_sem(struct task_struct *tsk)
45{
46 return;
47}
48#endif
49
50#endif /* _LINUX_SEM_H */