2
* Copyright © 2015 Intel
4
* Permission is hereby granted, free of charge, to any person obtaining a
5
* copy of this software and associated documentation files (the "Software"),
6
* to deal in the Software without restriction, including without limitation
7
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
8
* and/or sell copies of the Software, and to permit persons to whom the
9
* Software is furnished to do so, subject to the following conditions:
11
* The above copyright notice and this permission notice (including the next
12
* paragraph) shall be included in all copies or substantial portions of the
15
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
27
#if defined(HAVE_LINUX_FUTEX_H)
28
#define UTIL_FUTEX_SUPPORTED 1
33
#include <linux/futex.h>
34
#include <sys/syscall.h>
37
static inline long sys_futex(void *addr1, int op, int val1, const struct timespec *timeout, void *addr2, int val3)
39
return syscall(SYS_futex, addr1, op, val1, timeout, addr2, val3);
42
static inline int futex_wake(uint32_t *addr, int count)
44
return sys_futex(addr, FUTEX_WAKE, count, NULL, NULL, 0);
47
static inline int futex_wait(uint32_t *addr, int32_t value, const struct timespec *timeout)
49
/* FUTEX_WAIT_BITSET with FUTEX_BITSET_MATCH_ANY is equivalent to
50
* FUTEX_WAIT, except that it treats the timeout as absolute. */
51
return sys_futex(addr, FUTEX_WAIT_BITSET, value, timeout, NULL,
52
FUTEX_BITSET_MATCH_ANY);
55
#elif defined(__FreeBSD__)
56
#define UTIL_FUTEX_SUPPORTED 1
61
#include <sys/types.h>
65
static inline int futex_wake(uint32_t *addr, int count)
67
assert(count == (int)(uint32_t)count); /* Check that bits weren't discarded */
68
return _umtx_op(addr, UMTX_OP_WAKE, (uint32_t)count, NULL, NULL) == -1 ? errno : 0;
71
static inline int futex_wait(uint32_t *addr, int32_t value, struct timespec *timeout)
73
void *uaddr = NULL, *uaddr2 = NULL;
74
struct _umtx_time tmo = {
75
._flags = UMTX_ABSTIME,
76
._clockid = CLOCK_MONOTONIC
79
assert(value == (int)(uint32_t)value); /* Check that bits weren't discarded */
81
if (timeout != NULL) {
82
tmo._timeout = *timeout;
83
uaddr = (void *)(uintptr_t)sizeof(tmo);
84
uaddr2 = (void *)&tmo;
87
return _umtx_op(addr, UMTX_OP_WAIT_UINT, (uint32_t)value, uaddr, uaddr2) == -1 ? errno : 0;
90
#elif defined(__OpenBSD__)
91
#define UTIL_FUTEX_SUPPORTED 1
94
#include <sys/futex.h>
96
static inline int futex_wake(uint32_t *addr, int count)
98
return futex(addr, FUTEX_WAKE, count, NULL, NULL);
101
static inline int futex_wait(uint32_t *addr, int32_t value, const struct timespec *timeout)
103
struct timespec tsnow, tsrel;
106
return futex(addr, FUTEX_WAIT, value, NULL, NULL);
108
clock_gettime(CLOCK_MONOTONIC, &tsnow);
109
if (timespeccmp(&tsnow, timeout, <))
110
timespecsub(timeout, &tsnow, &tsrel);
112
timespecclear(&tsrel);
113
return futex(addr, FUTEX_WAIT, value, &tsrel, NULL);
117
#define UTIL_FUTEX_SUPPORTED 0
120
#endif /* UTIL_FUTEX_H */