#ifndef _LINUX_SEM_H
#define _LINUX_SEM_H

#include <linux/atomic.h>
#include <linux/rcupdate.h>
#include <linux/cache.h>
#include <uapi/linux/sem.h>

struct task_struct;

/* One sem_array data structure for each set of semaphores in the system. */
struct sem_array {
struct kern_ipc_perm ____cacheline_aligned_in_smp
sem_perm; /* permissions .. see ipc.h */
time_t sem_ctime; /* last change time */
struct sem *sem_base; /* ptr to first semaphore in array */
struct list_head pending_alter; /* pending operations */
/* that alter the array */
struct list_head pending_const; /* pending complex operations */
/* that do not alter semvals */
struct list_head list_id; /* undo requests on this array */
int sem_nsems; /* no. of semaphores in array */
int complex_count; /* pending complex operations */
};

#ifdef CONFIG_SYSVIPC

struct sysv_sem {
struct sem_undo_list *undo_list;
};

extern int copy_semundo(unsigned long clone_flags, struct task_struct *tsk);
extern void exit_sem(struct task_struct *tsk);

#else

struct sysv_sem {
/* empty */
};

static inline int copy_semundo(unsigned long clone_flags, struct task_struct *tsk)
{
return 0;
}

static inline void exit_sem(struct task_struct *tsk)
{
return;
}
#endif

#endif /* _LINUX_SEM_H */