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 sem_perm; /* permissions .. see ipc.h */
14 time_t sem_ctime; /* last change time */
15 struct sem *sem_base; /* ptr to first semaphore in array */
16 struct list_head pending_alter; /* pending operations */
17 /* that alter the array */
18 struct list_head pending_const; /* pending complex operations */
19 /* that do not alter semvals */
20 struct list_head list_id; /* undo requests on this array */
21 int sem_nsems; /* no. of semaphores in array */
22 int complex_count; /* pending complex operations */
23 unsigned int use_global_lock;/* >0: global lock required */
24};
25
26#ifdef CONFIG_SYSVIPC
27
28struct sysv_sem {
29 struct sem_undo_list *undo_list;
30};
31
32extern int copy_semundo(unsigned long clone_flags, struct task_struct *tsk);
33extern void exit_sem(struct task_struct *tsk);
34
35#else
36
37struct sysv_sem {
38 /* empty */
39};
40
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
52#endif /* _LINUX_SEM_H */