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}; 25 26#ifdef CONFIG_SYSVIPC 27 28struct sysv_sem { 29 struct sem_undo_list *undo_list; 30}; 31 32extern int copy_semundo(unsigned long clone_flags, struct task_struct *tsk); 33extern void exit_sem(struct task_struct *tsk); 34 35#else 36 37struct sysv_sem { 38 /* empty */ 39}; 40 41static inline int copy_semundo(unsigned long clone_flags, struct task_struct *tsk) 42{ 43 return 0; 44} 45 46static inline void exit_sem(struct task_struct *tsk) 47{ 48 return; 49} 50#endif 51 52#endif /* _LINUX_SEM_H */ 53