1/* Copyright (C) 2000-2026 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library. If not, see
16 <https://www.gnu.org/licenses/>. */
17
18#ifndef _SYS_TAS_H
19#define _SYS_TAS_H 1
20
21#include <features.h>
22#include <sgidefs.h>
23
24__BEGIN_DECLS
25
26extern int _test_and_set (int *__p, int __v)
27 __THROW __attribute__ ((__nomips16__));
28
29#ifdef __USE_EXTERN_INLINES
30
31# ifndef _EXTERN_INLINE
32# define _EXTERN_INLINE __extern_inline
33# endif
34
35_EXTERN_INLINE int __attribute__ ((__nomips16__))
36__NTH (_test_and_set (int *__p, int __v))
37{
38 int __r, __t;
39
40 /* The R5900 reports itself as MIPS III but it does not have LL/SC. */
41 __asm__ __volatile__
42 ("/* Inline test and set */\n"
43 ".set push\n\t"
44#if _MIPS_SIM == _ABIO32 && (__mips < 2 || defined (_MIPS_ARCH_R5900))
45 ".set mips2\n\t"
46#endif
47 "sync\n\t"
48 "1:\n\t"
49 "ll %0,%3\n\t"
50 "move %1,%4\n\t"
51 "beq %0,%4,2f\n\t"
52 "sc %1,%2\n\t"
53 "beqz %1,1b\n"
54 "sync\n\t"
55 ".set pop\n\t"
56 "2:\n\t"
57 "/* End test and set */"
58 : "=&r" (__r), "=&r" (__t), "=m" (*__p)
59 : "m" (*__p), "r" (__v)
60 : "memory");
61
62 return __r;
63}
64
65#endif /* __USE_EXTERN_INLINES */
66
67__END_DECLS
68
69#endif /* sys/tas.h */