7 * Userspace RCU - sys_futex/compat_futex header.
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.
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.
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
24 #include <urcu/config.h>
35 * sys_futex compatibility header.
36 * Use *only* *either of* futex_noasync OR futex_async on a given address.
38 * futex_noasync cannot be executed in signal handlers, but ensures that
39 * it will be put in a wait queue even in compatibility mode.
41 * futex_async is signal-handler safe for the wakeup. It uses polling
42 * on the wait-side in compatibility mode.
45 #ifdef CONFIG_RCU_HAVE_FUTEX
46 #include <sys/syscall.h>
47 #define futex(...) syscall(__NR_futex, __VA_ARGS__)
48 #define futex_noasync(uaddr, op, val, timeout, uaddr2, val3) \
49 futex(uaddr, op, val, timeout, uaddr2, val3)
50 #define futex_async(uaddr, op, val, timeout, uaddr2, val3) \
51 futex(uaddr, op, val, timeout, uaddr2, val3)
53 extern int compat_futex_noasync(int32_t *uaddr
, int op
, int32_t val
,
54 const struct timespec
*timeout
, int32_t *uaddr2
, int32_t val3
);
55 #define futex_noasync(uaddr, op, val, timeout, uaddr2, val3) \
56 compat_futex_noasync(uaddr, op, val, timeout, uaddr2, val3)
57 extern int compat_futex_async(int32_t *uaddr
, int op
, int32_t val
,
58 const struct timespec
*timeout
, int32_t *uaddr2
, int32_t val3
);
59 #define futex_async(uaddr, op, val, timeout, uaddr2, val3) \
60 compat_futex_async(uaddr, op, val, timeout, uaddr2, val3)
67 #endif /* _URCU_FUTEX_H */
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