projects / urcu.git / blame
| Commit | Line | Data |
|---|---|---|
| 49617de1 MD |
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 | * | |
| 3282a76b MD |
9 | * Copyright 2011-2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 10 | * | |
| 49617de1 MD |
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 | |
| 36bc70a8 MD |
29 | #ifdef __cplusplus |
| 30 | extern "C" { | |
| 31 | #endif | |
| 32 | ||
| 49617de1 MD |
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. | |
| 11eb040f MD |
45 | * |
| 46 | * BEWARE: sys_futex() FUTEX_WAIT may return early if interrupted | |
| 47 | * (returns EINTR). | |
| 49617de1 MD |
48 | */ |
| 49 | ||
| 02be5561 | 50 | #ifdef CONFIG_RCU_HAVE_FUTEX |
| 49617de1 MD |
51 | #include <sys/syscall.h> |
| 52 | #define futex(...) syscall(__NR_futex, __VA_ARGS__) | |
| 53 | #define futex_noasync(uaddr, op, val, timeout, uaddr2, val3) \ | |
| 54 | futex(uaddr, op, val, timeout, uaddr2, val3) | |
| 55 | #define futex_async(uaddr, op, val, timeout, uaddr2, val3) \ | |
| 56 | futex(uaddr, op, val, timeout, uaddr2, val3) | |
| 57 | #else | |
| 6d841bc2 MD |
58 | extern int compat_futex_noasync(int32_t *uaddr, int op, int32_t val, |
| 59 | const struct timespec *timeout, int32_t *uaddr2, int32_t val3); | |
| 49617de1 MD |
60 | #define futex_noasync(uaddr, op, val, timeout, uaddr2, val3) \ |
| 61 | compat_futex_noasync(uaddr, op, val, timeout, uaddr2, val3) | |
| 6d841bc2 MD |
62 | extern int compat_futex_async(int32_t *uaddr, int op, int32_t val, |
| 63 | const struct timespec *timeout, int32_t *uaddr2, int32_t val3); | |
| 49617de1 MD |
64 | #define futex_async(uaddr, op, val, timeout, uaddr2, val3) \ |
| 65 | compat_futex_async(uaddr, op, val, timeout, uaddr2, val3) | |
| 66 | #endif | |
| 67 | ||
| 36bc70a8 MD |
68 | #ifdef __cplusplus |
| 69 | } | |
| 70 | #endif | |
| 71 | ||
| 49617de1 | 72 | #endif /* _URCU_FUTEX_H */ |