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1 | /* Copyright (C) 2005 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 Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) 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 Lesser General Public License for | |
14 | more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with libgomp; see the file COPYING.LIB. If not, write to the | |
18 | Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, | |
19 | MA 02110-1301, USA. */ | |
20 | ||
21 | /* As a special exception, if you link this library with other files, some | |
22 | of which are compiled with GCC, to produce an executable, this library | |
23 | does not by itself cause the resulting executable to be covered by the | |
24 | GNU General Public License. This exception does not however invalidate | |
25 | any other reasons why the executable file might be covered by the GNU | |
26 | General Public License. */ | |
27 | ||
28 | /* Provide target-specific access to the futex system call. */ | |
29 | ||
30 | #include <sys/syscall.h> | |
31 | #define FUTEX_WAIT 0 | |
32 | #define FUTEX_WAKE 1 | |
33 | ||
34 | static inline void | |
35 | sys_futex0 (int *addr, int op, int val) | |
36 | { | |
37 | register long int gpr2 __asm__ ("2"); | |
38 | register long int gpr3 __asm__ ("3"); | |
39 | register long int gpr4 __asm__ ("4"); | |
40 | register long int gpr5 __asm__ ("5"); | |
41 | ||
42 | gpr2 = (long) addr; | |
43 | gpr3 = op; | |
44 | gpr4 = val; | |
45 | gpr5 = 0; | |
46 | ||
47 | __asm volatile ("svc %b1" | |
48 | : "=d" (gpr2) | |
49 | : "i" (SYS_futex), | |
50 | "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5) | |
51 | : "memory"); | |
52 | } | |
53 | ||
54 | static inline void | |
55 | futex_wait (int *addr, int val) | |
56 | { | |
57 | sys_futex0 (addr, FUTEX_WAIT, val); | |
58 | } | |
59 | ||
60 | static inline void | |
61 | futex_wake (int *addr, int count) | |
62 | { | |
63 | sys_futex0 (addr, FUTEX_WAKE, count); | |
64 | } |