Release 4.12 include/linux/sem.h

#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	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 */
	
unsigned int		use_global_lock;/* >0: global lock required */
};

#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;
}

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static inline void exit_sem(struct task_struct *tsk)
{
	return;
}
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#endif

#endif /* _LINUX_SEM_H */
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Directory: include/linux

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