Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Futex2 library addons for futex tests
4 *
5 * Copyright 2021 Collabora Ltd.
6 */
7#include <linux/time_types.h>
8#include <stdint.h>
9
10#define u64_to_ptr(x) ((void *)(uintptr_t)(x))
11
12#ifndef __NR_futex_waitv
13#define __NR_futex_waitv 449
14struct futex_waitv {
15 __u64 val;
16 __u64 uaddr;
17 __u32 flags;
18 __u32 __reserved;
19};
20#endif
21
22#ifndef __NR_futex_wake
23#define __NR_futex_wake 454
24#endif
25
26#ifndef __NR_futex_wait
27#define __NR_futex_wait 455
28#endif
29
30#ifndef FUTEX2_SIZE_U32
31#define FUTEX2_SIZE_U32 0x02
32#endif
33
34#ifndef FUTEX2_NUMA
35#define FUTEX2_NUMA 0x04
36#endif
37
38#ifndef FUTEX2_MPOL
39#define FUTEX2_MPOL 0x08
40#endif
41
42#ifndef FUTEX2_PRIVATE
43#define FUTEX2_PRIVATE FUTEX_PRIVATE_FLAG
44#endif
45
46#ifndef FUTEX2_NO_NODE
47#define FUTEX_NO_NODE (-1)
48#endif
49
50#ifndef FUTEX_32
51#define FUTEX_32 FUTEX2_SIZE_U32
52#endif
53
54struct futex32_numa {
55 futex_t futex;
56 futex_t numa;
57};
58
59/**
60 * futex_waitv - Wait at multiple futexes, wake on any
61 * @waiters: Array of waiters
62 * @nr_waiters: Length of waiters array
63 * @flags: Operation flags
64 * @timo: Optional timeout for operation
65 */
66static inline int futex_waitv(volatile struct futex_waitv *waiters, unsigned long nr_waiters,
67 unsigned long flags, struct timespec *timo, clockid_t clockid)
68{
69 struct __kernel_timespec ts = {
70 .tv_sec = timo->tv_sec,
71 .tv_nsec = timo->tv_nsec,
72 };
73
74 return syscall(__NR_futex_waitv, waiters, nr_waiters, flags, &ts, clockid);
75}
76
77/*
78 * futex_wait() - block on uaddr with optional timeout
79 * @val: Expected value
80 * @flags: FUTEX2 flags
81 * @timeout: Relative timeout
82 * @clockid: Clock id for the timeout
83 */
84static inline int futex2_wait(void *uaddr, long val, unsigned int flags,
85 struct timespec *timeout, clockid_t clockid)
86{
87 return syscall(__NR_futex_wait, uaddr, val, ~0U, flags, timeout, clockid);
88}
89
90/*
91 * futex2_wake() - Wake a number of futexes
92 * @nr: Number of threads to wake at most
93 * @flags: FUTEX2 flags
94 */
95static inline int futex2_wake(void *uaddr, int nr, unsigned int flags)
96{
97 return syscall(__NR_futex_wake, uaddr, ~0U, nr, flags);
98}