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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 | * | |
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 | #define FUTEX_WAIT 0 | |
27 | #define FUTEX_WAKE 1 | |
28 | ||
29 | /* | |
30 | * sys_futex compatibility header. | |
31 | * Use *only* *either of* futex_noasync OR futex_async on a given address. | |
32 | * | |
33 | * futex_noasync cannot be executed in signal handlers, but ensures that | |
34 | * it will be put in a wait queue even in compatibility mode. | |
35 | * | |
36 | * futex_async is signal-handler safe for the wakeup. It uses polling | |
37 | * on the wait-side in compatibility mode. | |
38 | */ | |
39 | ||
40 | #ifdef CONFIG_URCU_HAVE_FUTEX | |
41 | #include <sys/syscall.h> | |
42 | #define futex(...) syscall(__NR_futex, __VA_ARGS__) | |
43 | #define futex_noasync(uaddr, op, val, timeout, uaddr2, val3) \ | |
44 | futex(uaddr, op, val, timeout, uaddr2, val3) | |
45 | #define futex_async(uaddr, op, val, timeout, uaddr2, val3) \ | |
46 | futex(uaddr, op, val, timeout, uaddr2, val3) | |
47 | #else | |
48 | extern int compat_futex_noasync(int *uaddr, int op, int val, | |
49 | const struct timespec *timeout, int *uaddr2, int val3); | |
50 | #define futex_noasync(uaddr, op, val, timeout, uaddr2, val3) \ | |
51 | compat_futex_noasync(uaddr, op, val, timeout, uaddr2, val3) | |
52 | extern int compat_futex_async(int *uaddr, int op, int val, | |
53 | const struct timespec *timeout, int *uaddr2, int val3); | |
54 | #define futex_async(uaddr, op, val, timeout, uaddr2, val3) \ | |
55 | compat_futex_async(uaddr, op, val, timeout, uaddr2, val3) | |
56 | #endif | |
57 | ||
58 | #endif /* _URCU_FUTEX_H */ |