1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
/* Copyright (C) 2011-2015 Free Software Foundation, Inc.
Contributed by Walter Lee (walt@tilera.com)
This file is part of the GNU Offloading and Multi Processing Library
(libgomp).
Libgomp is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
/* Provide target-specific access to the futex system call. */
#include <sys/syscall.h>
#include <linux/futex.h>
static inline void
sys_futex0 (int *addr, int op, int val)
{
long _sys_result;
long _clobber_r2, _clobber_r3, _clobber_r4, _clobber_r5, _clobber_r10;
int err;
__asm__ __volatile__ (
"swint1"
: "=R00" (_sys_result), "=R01" (err), "=R02" (_clobber_r2),
"=R03" (_clobber_r3), "=R04" (_clobber_r4), "=R05" (_clobber_r5),
"=R10" (_clobber_r10)
: "R10" (SYS_futex), "R00" (addr), "R01" (op), "R02" (val),
"R03" (0)
: "r6", "r7",
"r8", "r9", "r11", "r12", "r13", "r14", "r15",
"r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
"r24", "r25", "r26", "r27", "r28", "r29", "memory");
}
static inline void
futex_wait (int *addr, int val)
{
sys_futex0 (addr, FUTEX_WAIT, val);
}
static inline void
futex_wake (int *addr, int count)
{
sys_futex0 (addr, FUTEX_WAKE, count);
}
static inline void
cpu_relax (void)
{
__asm volatile ("" : : : "memory");
}
static inline void
atomic_write_barrier (void)
{
__sync_synchronize ();
}
|
