[linux-2.6-block.git] / include / linux / sem.h

#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 */
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_SEM_H
	2	#define _LINUX_SEM_H
	3
60063497	4	#include <linux/atomic.h>
380af1b3	5	#include <linux/rcupdate.h>
31a7c474	6	#include <linux/cache.h>
607ca46e	7	#include <uapi/linux/sem.h>
1da177e4	8
8c65b4a6 TS	9	struct task_struct;
8c65b4a6 TS	10
1da177e4 LT	11	/* One sem_array data structure for each set of semaphores in the system. */
1da177e4 LT	12	struct sem_array {
31a7c474 MS	13	struct kern_ipc_perm ____cacheline_aligned_in_smp
31a7c474 MS	14	sem_perm; /* permissions .. see ipc.h */
1da177e4 LT	15	time_t sem_ctime; /* last change time */
1da177e4 LT	16	struct sem sem_base; / ptr to first semaphore in array */
1a82e9e1 MS	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 */
4daa28f6	21	struct list_head list_id; /* undo requests on this array */
b97e820f MS	22	int sem_nsems; /* no. of semaphores in array */
b97e820f MS	23	int complex_count; /* pending complex operations */
1da177e4 LT	24	};
1da177e4 LT	25
f567a185 MS	26	#ifdef CONFIG_SYSVIPC
f567a185 MS	27
1da177e4 LT	28	struct sysv_sem {
	29	struct sem_undo_list *undo_list;
	30	};
	31
1da177e4 LT	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
f567a185 MS	36
	37	struct sysv_sem {
	38	/* empty */
	39	};
	40
1da177e4 LT	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
1da177e4	52	#endif /* _LINUX_SEM_H */