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