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TOMOYO Linux Cross Reference
Linux/include/linux/sem.h

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  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    sem_perm;       /* permissions .. see ipc.h */
 14         time_t                  sem_ctime;      /* last change time */
 15         struct sem              *sem_base;      /* ptr to first semaphore in array */
 16         struct list_head        pending_alter;  /* pending operations */
 17                                                 /* that alter the array */
 18         struct list_head        pending_const;  /* pending complex operations */
 19                                                 /* that do not alter semvals */
 20         struct list_head        list_id;        /* undo requests on this array */
 21         int                     sem_nsems;      /* no. of semaphores in array */
 22         int                     complex_count;  /* pending complex operations */
 23         unsigned int            use_global_lock;/* >0: global lock required */
 24 };
 25 
 26 #ifdef CONFIG_SYSVIPC
 27 
 28 struct sysv_sem {
 29         struct sem_undo_list *undo_list;
 30 };
 31 
 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
 36 
 37 struct sysv_sem {
 38         /* empty */
 39 };
 40 
 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 
 52 #endif /* _LINUX_SEM_H */
 53 

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