root/include/linux/sem.h

INCLUDED FROM

DEFINITIONS

1. copy_semundo
2. exit_sem

#ifndef _LINUX_SEM_H
#define _LINUX_SEM_H

#include <linux/atomic.h>
#include <linux/rcupdate.h>
#include <linux/cache.h>
#include <uapi/linux/sem.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_ctime;      /* last change time */
        struct sem              *sem_base;      /* ptr to first semaphore in array */
        struct list_head        pending_alter;  /* pending operations */
                                                /* that alter the array */
        struct list_head        pending_const;  /* pending complex operations */
                                                /* that do not alter semvals */
        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 /* _LINUX_SEM_H */