cregit-Linux how code gets into the kernel

Release 4.15 include/linux/sem.h

Directory: include/linux
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_SEM_H

#define _LINUX_SEM_H

#include <linux/atomic.h>
#include <linux/rcupdate.h>
#include <linux/cache.h>
#include <linux/time64.h>
#include <uapi/linux/sem.h>

struct task_struct;

/* One semaphore structure for each semaphore in the system. */

struct sem {
	
int	semval;		/* current value */
	/*
         * PID of the process that last modified the semaphore. For
         * Linux, specifically these are:
         *  - semop
         *  - semctl, via SETVAL and SETALL.
         *  - at task exit when performing undo adjustments (see exit_sem).
         */
	
int	sempid;
	
spinlock_t	lock;	/* spinlock for fine-grained semtimedop */
	
struct list_head pending_alter; /* pending single-sop operations */
					/* that alter the semaphore */
	
struct list_head pending_const; /* pending single-sop operations */
					/* that do not alter the semaphore*/
	
time_t	sem_otime;	/* candidate for sem_otime */

} ____cacheline_aligned_in_smp;

/* 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 */
	
time64_t		sem_ctime;	/* create/last semctl() time */
	
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 */

	
struct sem		sems[];

} __randomize_layout;

#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; }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton19100.00%1100.00%
Total19100.00%1100.00%


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

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton13100.00%1100.00%
Total13100.00%1100.00%

#endif #endif /* _LINUX_SEM_H */

Overall Contributors

PersonTokensPropCommitsCommitProp
Manfred Spraul7639.38%1152.38%
Andrew Morton6031.09%29.52%
Linus Torvalds (pre-git)3417.62%29.52%
Dave Olien105.18%14.76%
David Howells42.07%14.76%
Deepa Dinamani42.07%14.76%
Tim Schmielau31.55%14.76%
Greg Kroah-Hartman10.52%14.76%
Kees Cook10.52%14.76%
Davidlohr Bueso A0.00%00.00%
Total193100.00%21100.00%
Directory: include/linux
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.