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
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
/* Copyright (C) 2005, 2008, 2009 Free Software Foundation, Inc.
Contributed by Richard Henderson <rth@redhat.com>.
This file is part of the GNU OpenMP 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. */
#ifdef __LP64__
# ifndef SYS_futex
# define SYS_futex 202
# endif
static inline void
futex_wait (int *addr, int val)
{
register long r10 __asm__("%r10");
long res;
r10 = 0;
__asm volatile ("syscall"
: "=a" (res)
: "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wait),
"d" (val), "r" (r10)
: "r11", "rcx", "memory");
if (__builtin_expect (res == -ENOSYS, 0))
{
gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
r10 = 0;
__asm volatile ("syscall"
: "=a" (res)
: "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wait),
"d" (val), "r" (r10)
: "r11", "rcx", "memory");
}
}
static inline void
futex_wake (int *addr, int count)
{
long res;
__asm volatile ("syscall"
: "=a" (res)
: "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wake),
"d" (count)
: "r11", "rcx", "memory");
if (__builtin_expect (res == -ENOSYS, 0))
{
gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
__asm volatile ("syscall"
: "=a" (res)
: "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wake),
"d" (count)
: "r11", "rcx", "memory");
}
}
#else
# ifndef SYS_futex
# define SYS_futex 240
# endif
# ifdef __PIC__
static inline long
sys_futex0 (int *addr, int op, int val)
{
long res;
__asm volatile ("xchgl\t%%ebx, %2\n\t"
"int\t$0x80\n\t"
"xchgl\t%%ebx, %2"
: "=a" (res)
: "0"(SYS_futex), "r" (addr), "c"(op),
"d"(val), "S"(0)
: "memory");
return res;
}
# else
static inline long
sys_futex0 (int *addr, int op, int val)
{
long res;
__asm volatile ("int $0x80"
: "=a" (res)
: "0"(SYS_futex), "b" (addr), "c"(op),
"d"(val), "S"(0)
: "memory");
return res;
}
# endif /* __PIC__ */
static inline void
futex_wait (int *addr, int val)
{
long res = sys_futex0 (addr, gomp_futex_wait, val);
if (__builtin_expect (res == -ENOSYS, 0))
{
gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
sys_futex0 (addr, gomp_futex_wait, val);
}
}
static inline void
futex_wake (int *addr, int count)
{
long res = sys_futex0 (addr, gomp_futex_wake, count);
if (__builtin_expect (res == -ENOSYS, 0))
{
gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
sys_futex0 (addr, gomp_futex_wake, count);
}
}
#endif /* __LP64__ */
static inline void
cpu_relax (void)
{
__asm volatile ("rep; nop" : : : "memory");
}
static inline void
atomic_write_barrier (void)
{
__sync_synchronize ();
}
|
