1 /* Copyright (C) 2000, 2002, 2003, 2004 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Maciej W. Rozycki <macro@ds2.pg.gda.pl>, 2000.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19 #ifndef _SYS_TAS_H
20 #define _SYS_TAS_H 1
21
22 #include <features.h>
23 #include <sgidefs.h>
24
25 __BEGIN_DECLS
26
27 extern int _test_and_set (int *p, int v) __THROW;
28
29 #ifdef __USE_EXTERN_INLINES
30
31 # ifndef _EXTERN_INLINE
32 # define _EXTERN_INLINE __extern_inline
33 # endif
34
35 _EXTERN_INLINE int
__NTH(_test_and_set (int * p,int v))36 __NTH (_test_and_set (int *p, int v))
37 {
38 int r, t;
39
40 __asm__ __volatile__
41 ("/* Inline test and set */\n"
42 "1:\n\t"
43 ".set push\n\t"
44 #if _MIPS_SIM == _ABIO32
45 ".set mips2\n\t"
46 #endif
47 "ll %0,%3\n\t"
48 "move %1,%4\n\t"
49 "beq %0,%4,2f\n\t"
50 "sc %1,%2\n\t"
51 ".set pop\n\t"
52 "beqz %1,1b\n"
53 "2:\n\t"
54 "/* End test and set */"
55 : "=&r" (r), "=&r" (t), "=m" (*p)
56 : "m" (*p), "r" (v)
57 : "memory");
58
59 return r;
60 }
61
62 #endif /* __USE_EXTERN_INLINES */
63
64 __END_DECLS
65
66 #endif /* sys/tas.h */
67