Android: add a compat layer for 'syscall.h'
[urcu.git] / urcu / futex.h
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1#ifndef _URCU_FUTEX_H
2#define _URCU_FUTEX_H
3
4/*
5 * urcu-futex.h
6 *
7 * Userspace RCU - sys_futex/compat_futex header.
8 *
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9 * Copyright 2011-2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
10 *
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11 * This library is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU Lesser General Public
13 * License as published by the Free Software Foundation; either
14 * version 2.1 of the License, or (at your option) any later version.
15 *
16 * This library is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * Lesser General Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser General Public
22 * License along with this library; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 */
25
26#include <urcu/config.h>
6d841bc2 27#include <stdint.h>
49617de1 28
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29#ifdef __cplusplus
30extern "C" {
31#endif
32
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33#define FUTEX_WAIT 0
34#define FUTEX_WAKE 1
35
36/*
37 * sys_futex compatibility header.
38 * Use *only* *either of* futex_noasync OR futex_async on a given address.
39 *
40 * futex_noasync cannot be executed in signal handlers, but ensures that
41 * it will be put in a wait queue even in compatibility mode.
42 *
43 * futex_async is signal-handler safe for the wakeup. It uses polling
44 * on the wait-side in compatibility mode.
45 */
46
02be5561 47#ifdef CONFIG_RCU_HAVE_FUTEX
9ba261bd 48#include <urcu/syscall-compat.h>
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49#define futex(...) syscall(__NR_futex, __VA_ARGS__)
50#define futex_noasync(uaddr, op, val, timeout, uaddr2, val3) \
51 futex(uaddr, op, val, timeout, uaddr2, val3)
52#define futex_async(uaddr, op, val, timeout, uaddr2, val3) \
53 futex(uaddr, op, val, timeout, uaddr2, val3)
54#else
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55extern int compat_futex_noasync(int32_t *uaddr, int op, int32_t val,
56 const struct timespec *timeout, int32_t *uaddr2, int32_t val3);
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57#define futex_noasync(uaddr, op, val, timeout, uaddr2, val3) \
58 compat_futex_noasync(uaddr, op, val, timeout, uaddr2, val3)
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59extern int compat_futex_async(int32_t *uaddr, int op, int32_t val,
60 const struct timespec *timeout, int32_t *uaddr2, int32_t val3);
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61#define futex_async(uaddr, op, val, timeout, uaddr2, val3) \
62 compat_futex_async(uaddr, op, val, timeout, uaddr2, val3)
63#endif
64
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65#ifdef __cplusplus
66}
67#endif
68
49617de1 69#endif /* _URCU_FUTEX_H */
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