[linux.git] / include / linux / sem.h

#ifndef _LINUX_SEM_H
#define _LINUX_SEM_H

#include <linux/ipc.h>

/* semop flags */
#define SEM_UNDO        0x1000  /* undo the operation on exit */

/* semctl Command Definitions. */
#define GETPID  11       /* get sempid */
#define GETVAL  12       /* get semval */
#define GETALL  13       /* get all semval's */
#define GETNCNT 14       /* get semncnt */
#define GETZCNT 15       /* get semzcnt */
#define SETVAL  16       /* set semval */
#define SETALL  17       /* set all semval's */

/* ipcs ctl cmds */
#define SEM_STAT 18
#define SEM_INFO 19

/* Obsolete, used only for backwards compatibility and libc5 compiles */
struct semid_ds {
	struct ipc_perm	sem_perm;		/* permissions .. see ipc.h */
	__kernel_time_t	sem_otime;		/* last semop time */
	__kernel_time_t	sem_ctime;		/* last change time */
	struct sem	*sem_base;		/* ptr to first semaphore in array */
	struct sem_queue *sem_pending;		/* pending operations to be processed */
	struct sem_queue **sem_pending_last;	/* last pending operation */
	struct sem_undo	*undo;			/* undo requests on this array */
	unsigned short	sem_nsems;		/* no. of semaphores in array */
};

/* Include the definition of semid64_ds */
#include <asm/sembuf.h>

/* semop system calls takes an array of these. */
struct sembuf {
	unsigned short  sem_num;	/* semaphore index in array */
	short		sem_op;		/* semaphore operation */
	short		sem_flg;	/* operation flags */
};

/* arg for semctl system calls. */
union semun {
	int val;			/* value for SETVAL */
	struct semid_ds __user *buf;	/* buffer for IPC_STAT & IPC_SET */
	unsigned short __user *array;	/* array for GETALL & SETALL */
	struct seminfo __user *__buf;	/* buffer for IPC_INFO */
	void __user *__pad;
};

struct  seminfo {
	int semmap;
	int semmni;
	int semmns;
	int semmnu;
	int semmsl;
	int semopm;
	int semume;
	int semusz;
	int semvmx;
	int semaem;
};

#define SEMMNI  128             /* <= IPCMNI  max # of semaphore identifiers */
#define SEMMSL  250             /* <= 8 000 max num of semaphores per id */
#define SEMMNS  (SEMMNI*SEMMSL) /* <= INT_MAX max # of semaphores in system */
#define SEMOPM  32	        /* <= 1 000 max num of ops per semop call */
#define SEMVMX  32767           /* <= 32767 semaphore maximum value */
#define SEMAEM  SEMVMX          /* adjust on exit max value */

/* unused */
#define SEMUME  SEMOPM          /* max num of undo entries per process */
#define SEMMNU  SEMMNS          /* num of undo structures system wide */
#define SEMMAP  SEMMNS          /* # of entries in semaphore map */
#define SEMUSZ  20		/* sizeof struct sem_undo */

#ifdef __KERNEL__
#include <linux/atomic.h>
#include <linux/rcupdate.h>
#include <linux/cache.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_otime;	/* last semop time */
	time_t			sem_ctime;	/* last change time */
	struct sem		*sem_base;	/* ptr to first semaphore in array */
	struct list_head	sem_pending;	/* pending operations to be processed */
	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 /* __KERNEL__ */

#endif /* _LINUX_SEM_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_SEM_H
	2	#define _LINUX_SEM_H
	3
	4	#include <linux/ipc.h>
1da177e4 LT	5
	6	/* semop flags */
	7	#define SEM_UNDO 0x1000 /* undo the operation on exit */
	8
	9	/* semctl Command Definitions. */
	10	#define GETPID 11 /* get sempid */
	11	#define GETVAL 12 /* get semval */
	12	#define GETALL 13 /* get all semval's */
	13	#define GETNCNT 14 /* get semncnt */
	14	#define GETZCNT 15 /* get semzcnt */
	15	#define SETVAL 16 /* set semval */
	16	#define SETALL 17 /* set all semval's */
	17
	18	/* ipcs ctl cmds */
	19	#define SEM_STAT 18
	20	#define SEM_INFO 19
	21
	22	/* Obsolete, used only for backwards compatibility and libc5 compiles */
	23	struct semid_ds {
	24	struct ipc_perm sem_perm; /* permissions .. see ipc.h */
	25	__kernel_time_t sem_otime; /* last semop time */
	26	__kernel_time_t sem_ctime; /* last change time */
	27	struct sem sem_base; / ptr to first semaphore in array */
	28	struct sem_queue sem_pending; / pending operations to be processed */
	29	struct sem_queue *sem_pending_last; / last pending operation */
	30	struct sem_undo undo; / undo requests on this array */
	31	unsigned short sem_nsems; /* no. of semaphores in array */
	32	};
	33
	34	/* Include the definition of semid64_ds */
	35	#include <asm/sembuf.h>
	36
	37	/* semop system calls takes an array of these. */
	38	struct sembuf {
	39	unsigned short sem_num; /* semaphore index in array */
	40	short sem_op; /* semaphore operation */
	41	short sem_flg; /* operation flags */
	42	};
	43
	44	/* arg for semctl system calls. */
	45	union semun {
	46	int val; /* value for SETVAL */
	47	struct semid_ds __user buf; / buffer for IPC_STAT & IPC_SET */
	48	unsigned short __user array; / array for GETALL & SETALL */
	49	struct seminfo __user __buf; / buffer for IPC_INFO */
	50	void __user *__pad;
	51	};
	52
	53	struct seminfo {
	54	int semmap;
	55	int semmni;
	56	int semmns;
	57	int semmnu;
	58	int semmsl;
	59	int semopm;
	60	int semume;
	61	int semusz;
	62	int semvmx;
	63	int semaem;
	64	};
	65
	66	#define SEMMNI 128 /* <= IPCMNI max # of semaphore identifiers */
	67	#define SEMMSL 250 /* <= 8 000 max num of semaphores per id */
	68	#define SEMMNS (SEMMNISEMMSL) / <= INT_MAX max # of semaphores in system */
69	#define SEMOPM 32 /* <= 1 000 max num of ops per semop call */
70	#define SEMVMX 32767 /* <= 32767 semaphore maximum value */
71	#define SEMAEM SEMVMX /* adjust on exit max value */
72
73	/* unused */
74	#define SEMUME SEMOPM /* max num of undo entries per process */
75	#define SEMMNU SEMMNS /* num of undo structures system wide */
76	#define SEMMAP SEMMNS /* # of entries in semaphore map */
77	#define SEMUSZ 20 /* sizeof struct sem_undo */
78
79	#ifdef __KERNEL__
60063497	80	#include <linux/atomic.h>
380af1b3	81	#include <linux/rcupdate.h>
31a7c474	82	#include <linux/cache.h>
1da177e4	83
8c65b4a6 TS	84	struct task_struct;
8c65b4a6 TS	85
1da177e4 LT	86	/* One sem_array data structure for each set of semaphores in the system. */
1da177e4 LT	87	struct sem_array {
31a7c474 MS	88	struct kern_ipc_perm ____cacheline_aligned_in_smp
31a7c474 MS	89	sem_perm; /* permissions .. see ipc.h */
1da177e4 LT	90	time_t sem_otime; /* last semop time */
	91	time_t sem_ctime; /* last change time */
	92	struct sem sem_base; / ptr to first semaphore in array */
a1193f8e	93	struct list_head sem_pending; /* pending operations to be processed */
4daa28f6	94	struct list_head list_id; /* undo requests on this array */
b97e820f MS	95	int sem_nsems; /* no. of semaphores in array */
b97e820f MS	96	int complex_count; /* pending complex operations */
1da177e4 LT	97	};
1da177e4 LT	98
f567a185 MS	99	#ifdef CONFIG_SYSVIPC
f567a185 MS	100
1da177e4 LT	101	struct sysv_sem {
	102	struct sem_undo_list *undo_list;
	103	};
	104
1da177e4 LT	105	extern int copy_semundo(unsigned long clone_flags, struct task_struct *tsk);
	106	extern void exit_sem(struct task_struct *tsk);
	107
	108	#else
f567a185 MS	109
	110	struct sysv_sem {
	111	/* empty */
	112	};
	113
1da177e4 LT	114	static inline int copy_semundo(unsigned long clone_flags, struct task_struct *tsk)
	115	{
	116	return 0;
	117	}
	118
	119	static inline void exit_sem(struct task_struct *tsk)
	120	{
	121	return;
	122	}
	123	#endif
	124
	125	#endif /* __KERNEL__ */
	126
	127	#endif /* _LINUX_SEM_H */