1 /* Copyright (C) 2000, 2002, 2003, 2004, 2007 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, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
19
20 #ifndef _SYS_TAS_H
21 #define _SYS_TAS_H 1
22
23 #include <features.h>
24 #include <sgidefs.h>
25
26 __BEGIN_DECLS
27
28 extern int _test_and_set (int *p, int v) __THROW;
29
30 #ifdef __USE_EXTERN_INLINES
31
32 # ifndef _EXTERN_INLINE
33 # define _EXTERN_INLINE __extern_inline
34 # endif
35
36 _EXTERN_INLINE int
__NTH(_test_and_set (int * p,int v))37 __NTH (_test_and_set (int *p, int v))
38 {
39 int r, t;
40
41 __asm__ __volatile__
42 ("/* Inline test and set */\n"
43 ".set push\n\t"
44 #if _MIPS_SIM == _ABIO32
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 */
70