1 /* $OpenBSD: futex.h,v 1.2 2018/08/26 06:50:30 visa Exp $ */
2 /*
3 * Copyright (c) 2017 Martin Pieuchot
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 static inline int
futex_wake(volatile uint32_t * p,int n,int priv)19 futex_wake(volatile uint32_t *p, int n, int priv)
20 {
21 return futex(p, FUTEX_WAKE | priv, n, NULL, NULL);
22 }
23
24 static inline void
futex_wait(volatile uint32_t * p,int val,int priv)25 futex_wait(volatile uint32_t *p, int val, int priv)
26 {
27 while (*p != (uint32_t)val)
28 futex(p, FUTEX_WAIT | priv, val, NULL, NULL);
29 }
30
31 static inline int
futex_twait(volatile uint32_t * p,int val,clockid_t clockid,const struct timespec * timeout,int priv)32 futex_twait(volatile uint32_t *p, int val, clockid_t clockid,
33 const struct timespec *timeout, int priv)
34 {
35 return futex(p, FUTEX_WAIT | priv, val, timeout, NULL);
36 }
37
38 static inline int
futex_requeue(volatile uint32_t * p,int n,int m,volatile uint32_t * q)39 futex_requeue(volatile uint32_t *p, int n, int m, volatile uint32_t *q)
40 {
41 return futex(p, FUTEX_REQUEUE, n, (void *)(long)m, q);
42 }
43