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comparison libgomp/config/linux/x86/futex.h @ 0:a06113de4d67

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author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
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-1:000000000000 0:a06113de4d67
1 /* Copyright (C) 2005, 2008, 2009 Free Software Foundation, Inc.
2 Contributed by Richard Henderson <rth@redhat.com>.
3
4 This file is part of the GNU OpenMP Library (libgomp).
5
6 Libgomp is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3, or (at your option)
9 any later version.
10
11 Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
13 FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 more details.
15
16 Under Section 7 of GPL version 3, you are granted additional
17 permissions described in the GCC Runtime Library Exception, version
18 3.1, as published by the Free Software Foundation.
19
20 You should have received a copy of the GNU General Public License and
21 a copy of the GCC Runtime Library Exception along with this program;
22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 <http://www.gnu.org/licenses/>. */
24
25 /* Provide target-specific access to the futex system call. */
26
27 #ifdef __LP64__
28 # ifndef SYS_futex
29 # define SYS_futex 202
30 # endif
31
32 static inline void
33 futex_wait (int *addr, int val)
34 {
35 register long r10 __asm__("%r10");
36 long res;
37
38 r10 = 0;
39 __asm volatile ("syscall"
40 : "=a" (res)
41 : "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wait),
42 "d" (val), "r" (r10)
43 : "r11", "rcx", "memory");
44 if (__builtin_expect (res == -ENOSYS, 0))
45 {
46 gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
47 gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
48 r10 = 0;
49 __asm volatile ("syscall"
50 : "=a" (res)
51 : "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wait),
52 "d" (val), "r" (r10)
53 : "r11", "rcx", "memory");
54 }
55 }
56
57 static inline void
58 futex_wake (int *addr, int count)
59 {
60 long res;
61
62 __asm volatile ("syscall"
63 : "=a" (res)
64 : "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wake),
65 "d" (count)
66 : "r11", "rcx", "memory");
67 if (__builtin_expect (res == -ENOSYS, 0))
68 {
69 gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
70 gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
71 __asm volatile ("syscall"
72 : "=a" (res)
73 : "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wake),
74 "d" (count)
75 : "r11", "rcx", "memory");
76 }
77 }
78 #else
79 # ifndef SYS_futex
80 # define SYS_futex 240
81 # endif
82
83 # ifdef __PIC__
84
85 static inline long
86 sys_futex0 (int *addr, int op, int val)
87 {
88 long res;
89
90 __asm volatile ("xchgl\t%%ebx, %2\n\t"
91 "int\t$0x80\n\t"
92 "xchgl\t%%ebx, %2"
93 : "=a" (res)
94 : "0"(SYS_futex), "r" (addr), "c"(op),
95 "d"(val), "S"(0)
96 : "memory");
97 return res;
98 }
99
100 # else
101
102 static inline long
103 sys_futex0 (int *addr, int op, int val)
104 {
105 long res;
106
107 __asm volatile ("int $0x80"
108 : "=a" (res)
109 : "0"(SYS_futex), "b" (addr), "c"(op),
110 "d"(val), "S"(0)
111 : "memory");
112 return res;
113 }
114
115 # endif /* __PIC__ */
116
117 static inline void
118 futex_wait (int *addr, int val)
119 {
120 long res = sys_futex0 (addr, gomp_futex_wait, val);
121 if (__builtin_expect (res == -ENOSYS, 0))
122 {
123 gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
124 gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
125 sys_futex0 (addr, gomp_futex_wait, val);
126 }
127 }
128
129 static inline void
130 futex_wake (int *addr, int count)
131 {
132 long res = sys_futex0 (addr, gomp_futex_wake, count);
133 if (__builtin_expect (res == -ENOSYS, 0))
134 {
135 gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
136 gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
137 sys_futex0 (addr, gomp_futex_wake, count);
138 }
139 }
140
141 #endif /* __LP64__ */
142
143 static inline void
144 cpu_relax (void)
145 {
146 __asm volatile ("rep; nop" : : : "memory");
147 }
148
149 static inline void
150 atomic_write_barrier (void)
151 {
152 __sync_synchronize ();
153 }