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_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 bool complex_mode; /* no parallel simple ops */
25};
26
27#ifdef CONFIG_SYSVIPC
28
29struct sysv_sem {
30 struct sem_undo_list *undo_list;
31};
32
33extern int copy_semundo(unsigned long clone_flags, struct task_struct *tsk);
34extern void exit_sem(struct task_struct *tsk);
35
36#else
37
38struct sysv_sem {
39 /* empty */
40};
41
42static inline int copy_semundo(unsigned long clone_flags, struct task_struct *tsk)
43{
44 return 0;
45}
46
47static inline void exit_sem(struct task_struct *tsk)
48{
49 return;
50}
51#endif
52
53#endif /* _LINUX_SEM_H */