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 9 struct task_struct; 10 11 /* One sem_array data structure for each set of semaphores in the system. */ 12 struct 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 bool complex_mode; /* no parallel simple ops */ 25 }; 26 27 #ifdef CONFIG_SYSVIPC 28 29 struct sysv_sem { 30 struct sem_undo_list *undo_list; 31 }; 32 33 extern int copy_semundo(unsigned long clone_flags, struct task_struct *tsk); 34 extern void exit_sem(struct task_struct *tsk); 35 36 #else 37 38 struct sysv_sem { 39 /* empty */ 40 }; 41 copy_semundo(unsigned long clone_flags,struct task_struct * tsk)42static inline int copy_semundo(unsigned long clone_flags, struct task_struct *tsk) 43 { 44 return 0; 45 } 46 exit_sem(struct task_struct * tsk)47static inline void exit_sem(struct task_struct *tsk) 48 { 49 return; 50 } 51 #endif 52 53 #endif /* _LINUX_SEM_H */ 54