atomicity.h (__compare_and_swap): Remove unused function.
[gcc.git] / libstdc++-v3 / config / cpu / mips / bits / atomicity.h
1 // Low-level functions for atomic operations. MIPS II version.
2
3 // Copyright (C) 2001 Free Software Foundation, Inc.
4 //
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 2, or (at your option)
9 // any later version.
10
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
15
16 // You should have received a copy of the GNU General Public License along
17 // with this library; see the file COPYING. If not, write to the Free
18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
19 // USA.
20
21 // As a special exception, you may use this file as part of a free software
22 // library without restriction. Specifically, if other files instantiate
23 // templates or use macros or inline functions from this file, or you compile
24 // this file and link it with other files to produce an executable, this
25 // file does not by itself cause the resulting executable to be covered by
26 // the GNU General Public License. This exception does not however
27 // invalidate any other reasons why the executable file might be covered by
28 // the GNU General Public License.
29
30 #ifndef _BITS_ATOMICITY_H
31 #define _BITS_ATOMICITY_H 1
32
33 // #include <sgidefs.h>
34 // #ifdef (_MIPS_ISA_MIPS2)
35
36 typedef int _Atomic_word;
37
38 static inline int
39 __attribute__ ((unused))
40 __exchange_and_add (volatile _Atomic_word *__mem, int __val)
41 {
42 int __result, __tmp;
43
44 __asm__ __volatile__
45 ("/* Inline exchange & add */\n\t"
46 "1:\n\t"
47 "ll %0,%3\n\t"
48 "addu %1,%4,%0\n\t"
49 "sc %1,%2\n\t"
50 "beqz %1,1b\n\t"
51 "/* End exchange & add */"
52 : "=&r"(__result), "=&r"(__tmp), "=m"(*__mem)
53 : "m" (*__mem), "r"(__val)
54 : "memory");
55
56 return __result;
57 }
58
59 static inline void
60 __attribute__ ((unused))
61 __atomic_add (volatile _Atomic_word *__mem, int __val)
62 {
63 int __result;
64
65 __asm__ __volatile__
66 ("/* Inline atomic add */\n\t"
67 "1:\n\t"
68 "ll %0,%2\n\t"
69 "addu %0,%3,%0\n\t"
70 "sc %0,%1\n\t"
71 "beqz %0,1b\n\t"
72 "/* End atomic add */"
73 : "=&r"(__result), "=m"(*__mem)
74 : "m" (*__mem), "r"(__val)
75 : "memory");
76 }
77
78 #endif /* atomicity.h */