2 * Copyright © 2013 Keith Packard
4 * Permission to use, copy, modify, distribute, and sell this software and its
5 * documentation for any purpose is hereby granted without fee, provided that
6 * the above copyright notice appear in all copies and that both that copyright
7 * notice and this permission notice appear in supporting documentation, and
8 * that the name of the copyright holders not be used in advertising or
9 * publicity pertaining to distribution of the software without specific,
10 * written prior permission. The copyright holders make no representations
11 * about the suitability of this software for any purpose. It is provided "as
12 * is" without express or implied warranty.
14 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
15 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
16 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
17 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
18 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
19 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
23 #ifndef _XSHMFENCE_FUTEX_H_
24 #define _XSHMFENCE_FUTEX_H_
29 #include <linux/futex.h>
31 #include <sys/syscall.h>
33 static inline long sys_futex(void *addr1, int op, int val1, struct timespec *timeout, void *addr2, int val3)
35 return syscall(SYS_futex, addr1, op, val1, timeout, addr2, val3);
38 static inline int futex_wake(int32_t *addr) {
39 return sys_futex(addr, FUTEX_WAKE, MAXINT, NULL, NULL, 0);
42 static inline int futex_wait(int32_t *addr, int32_t value) {
43 return sys_futex(addr, FUTEX_WAIT, value, NULL, NULL, 0);
46 #define barrier() __asm__ __volatile__("": : :"memory")
48 static inline void atomic_store(int32_t *f, int32_t v)
55 static inline int32_t atomic_fetch(int32_t *a)
68 #define xshmfence_init(fd)
70 #endif /* _XSHMFENCE_FUTEX_H_ */