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comparison libgomp/config/linux/s390/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 Jakub Jelinek <jakub@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 #include <sys/syscall.h>
28
29 static inline long
30 sys_futex0 (int *addr, int op, int val)
31 {
32 register long int gpr2 __asm__ ("2");
33 register long int gpr3 __asm__ ("3");
34 register long int gpr4 __asm__ ("4");
35 register long int gpr5 __asm__ ("5");
36
37 gpr2 = (long) addr;
38 gpr3 = op;
39 gpr4 = val;
40 gpr5 = 0;
41
42 __asm volatile ("svc %b1"
43 : "=d" (gpr2)
44 : "i" (SYS_futex),
45 "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5)
46 : "memory");
47 return gpr2;
48 }
49
50 static inline void
51 futex_wait (int *addr, int val)
52 {
53 long err = sys_futex0 (addr, gomp_futex_wait, val);
54 if (__builtin_expect (err == -ENOSYS, 0))
55 {
56 gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
57 gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
58 sys_futex0 (addr, gomp_futex_wait, val);
59 }
60 }
61
62 static inline void
63 futex_wake (int *addr, int count)
64 {
65 long err = sys_futex0 (addr, gomp_futex_wake, count);
66 if (__builtin_expect (err == -ENOSYS, 0))
67 {
68 gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
69 gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
70 sys_futex0 (addr, gomp_futex_wake, count);
71 }
72 }
73
74 static inline void
75 cpu_relax (void)
76 {
77 __asm volatile ("" : : : "memory");
78 }
79
80 static inline void
81 atomic_write_barrier (void)
82 {
83 __sync_synchronize ();
84 }