1 // Low-level functions for atomic operations: sh version -*- C++ -*-
2
3 // Copyright (C) 1999, 2001, 2002, 2003, 2004, 2005, 2006
4 // Free Software Foundation, Inc.
5 //
6 // This file is part of the GNU ISO C++ Library. This library is free
7 // software; you can redistribute it and/or modify it under the
8 // terms of the GNU General Public License as published by the
9 // Free Software Foundation; either version 2, or (at your option)
10 // any later version.
11
12 // This library is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
16
17 // You should have received a copy of the GNU General Public License along
18 // with this library; see the file COPYING. If not, write to the Free
19 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
20 // USA.
21
22 // As a special exception, you may use this file as part of a free software
23 // library without restriction. Specifically, if other files instantiate
24 // templates or use macros or inline functions from this file, or you compile
25 // this file and link it with other files to produce an executable, this
26 // file does not by itself cause the resulting executable to be covered by
27 // the GNU General Public License. This exception does not however
28 // invalidate any other reasons why the executable file might be covered by
29 // the GNU General Public License.
30
31 #ifndef _BITS_ATOMICITY_H
32 #define _BITS_ATOMICITY_H 1
33
34 #ifdef __SH4A__
35
36 typedef int _Atomic_word;
37
38 static inline _Atomic_word
39 __attribute__ ((__unused__))
__exchange_and_add(volatile _Atomic_word * __mem,int __val)40 __exchange_and_add (volatile _Atomic_word* __mem, int __val)
41 {
42 _Atomic_word __result;
43
44 __asm__ __volatile__
45 ("0:\n"
46 "\tmovli.l\t@%2,r0\n"
47 "\tmov\tr0,%1\n"
48 "\tadd\t%3,r0\n"
49 "\tmovco.l\tr0,@%2\n"
50 "\tbf\t0b"
51 : "+m" (*__mem), "=r" (__result)
52 : "r" (__mem), "rI08" (__val)
53 : "r0");
54
55 return __result;
56 }
57
58
59 static inline void
60 __attribute__ ((__unused__))
__atomic_add(volatile _Atomic_word * __mem,int __val)61 __atomic_add (volatile _Atomic_word* __mem, int __val)
62 {
63 asm("0:\n"
64 "\tmovli.l\t@%1,r0\n"
65 "\tadd\t%2,r0\n"
66 "\tmovco.l\tr0,@%1\n"
67 "\tbf\t0b"
68 : "+m" (*__mem)
69 : "r" (__mem), "rI08" (__val)
70 : "r0");
71 }
72
73 #else /* !__SH4A__ */
74
75 /* This is generic/atomicity.h */
76
77 #include <ext/atomicity.h>
78 #include <ext/concurrence.h>
79
80 namespace
81 {
82 __gnu_cxx::__mutex atomic_mutex;
83 } // anonymous namespace
84
_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)85 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
86
87 _Atomic_word
88 __attribute__ ((__unused__))
89 __exchange_and_add(volatile _Atomic_word* __mem, int __val)
90 {
91 __gnu_cxx::__scoped_lock sentry(atomic_mutex);
92 _Atomic_word __result;
93 __result = *__mem;
94 *__mem += __val;
95 return __result;
96 }
97
98 void
99 __attribute__ ((__unused__))
__atomic_add(volatile _Atomic_word * __mem,int __val)100 __atomic_add(volatile _Atomic_word* __mem, int __val)
101 { __exchange_and_add(__mem, __val); }
102
103 _GLIBCXX_END_NAMESPACE
104
105 #endif /* !__SH4A__ */
106
107 #endif /* atomicity.h */
108