Android: add a compat layer for 'syscall.h'
[urcu.git] / urcu / futex.h
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 *
9 * Copyright 2011-2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
10 *
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>
27 #include <stdint.h>
28
29 #ifdef __cplusplus
30 extern "C" {
31 #endif
32
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
47 #ifdef CONFIG_RCU_HAVE_FUTEX
48 #include <urcu/syscall-compat.h>
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
55 extern int compat_futex_noasync(int32_t *uaddr, int op, int32_t val,
56 const struct timespec *timeout, int32_t *uaddr2, int32_t val3);
57 #define futex_noasync(uaddr, op, val, timeout, uaddr2, val3) \
58 compat_futex_noasync(uaddr, op, val, timeout, uaddr2, val3)
59 extern int compat_futex_async(int32_t *uaddr, int op, int32_t val,
60 const struct timespec *timeout, int32_t *uaddr2, int32_t val3);
61 #define futex_async(uaddr, op, val, timeout, uaddr2, val3) \
62 compat_futex_async(uaddr, op, val, timeout, uaddr2, val3)
63 #endif
64
65 #ifdef __cplusplus
66 }
67 #endif
68
69 #endif /* _URCU_FUTEX_H */
This page took 0.039496 seconds and 4 git commands to generate.