| | 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 <syscall.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 */ |
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