Release 4.17 include/linux/futex.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_FUTEX_H

#define _LINUX_FUTEX_H

#include <linux/ktime.h>
#include <uapi/linux/futex.h>

struct inode;
struct mm_struct;
struct task_struct;

extern int
handle_futex_death(u32 __user *uaddr, struct task_struct *curr, int pi);

/*
 * Futexes are matched on equal values of this key.
 * The key type depends on whether it's a shared or private mapping.
 * Don't rearrange members without looking at hash_futex().
 *
 * offset is aligned to a multiple of sizeof(u32) (== 4) by definition.
 * We use the two low order bits of offset to tell what is the kind of key :
 *  00 : Private process futex (PTHREAD_PROCESS_PRIVATE)
 *       (no reference on an inode or mm)
 *  01 : Shared futex (PTHREAD_PROCESS_SHARED)
 *      mapped on a file (reference on the underlying inode)
 *  10 : Shared futex (PTHREAD_PROCESS_SHARED)
 *       (but private mapping on an mm, and reference taken on it)
*/


#define FUT_OFF_INODE    1 
/* We set bit 0 if key has a reference on inode */

#define FUT_OFF_MMSHARED 2 
/* We set bit 1 if key has a reference on mm */


union futex_key {
	
struct {
		
unsigned long pgoff;
		
struct inode *inode;
		
int offset;
	
} shared;
	
struct {
		
unsigned long address;
		
struct mm_struct *mm;
		
int offset;
	
} private;
	
struct {
		
unsigned long word;
		
void *ptr;
		
int offset;
	
} both;
};


#define FUTEX_KEY_INIT (union futex_key) { .both = { .ptr = NULL } }

#ifdef CONFIG_FUTEX
extern void exit_robust_list(struct task_struct *curr);

long do_futex(u32 __user *uaddr, int op, u32 val, ktime_t *timeout,
	      u32 __user *uaddr2, u32 val2, u32 val3);
#ifdef CONFIG_HAVE_FUTEX_CMPXCHG

#define futex_cmpxchg_enabled 1
#else
extern int futex_cmpxchg_enabled;
#endif
#else


static inline void exit_robust_list(struct task_struct *curr)
{
}

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static inline long do_futex(u32 __user *uaddr, int op, u32 val,
			    ktime_t *timeout, u32 __user *uaddr2,
			    u32 val2, u32 val3)
{
	return -EINVAL;
}
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#endif

#ifdef CONFIG_FUTEX_PI
extern void exit_pi_state_list(struct task_struct *curr);
#else


static inline void exit_pi_state_list(struct task_struct *curr)
{
}
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#endif

#endif
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Rusty Russell
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24.40%
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Ingo Molnar
59
23.60%
4
23.53%
Nico Pitre
17
6.80%
1
5.88%
Heiko Carstens
11
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1
5.88%
Eric Dumazet
11
4.40%
1
5.88%
Mike Frysinger
9
3.60%
1
5.88%
Thomas Gleixner
7
2.80%
2
11.76%
Peter Zijlstra
4
1.60%
1
5.88%
David Woodhouse
2
0.80%
1
5.88%
Greg Kroah-Hartman
1
0.40%
1
5.88%
David Howells
1
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1
5.88%
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250
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Directory: include/linux

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