mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-16 08:44:21 +08:00
f567a18590
For the sysvsem undo, each task struct contains a sysv_sem structure with a pointer to the undo information. This pointer is only necessary if sysvipc is enabled - thus the pointer can be made conditional on CONFIG_SYSVIPC. Signed-off-by: Manfred Spraul <manfred@colorfullife.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Mike Galbraith <efault@gmx.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
128 lines
3.7 KiB
C
128 lines
3.7 KiB
C
#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 */
|