1 // Low-level functions for atomic operations: sh version -*- C++ -*-
3 // Copyright (C) 1999, 2001, 2002, 2003, 2004, 2005, 2006
4 // Free Software Foundation, Inc.
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
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14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
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18 // with this library; see the file COPYING. If not, write to the Free
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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
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29 // the GNU General Public License.
31 #ifndef _BITS_ATOMICITY_H
32 #define _BITS_ATOMICITY_H 1
36 typedef int _Atomic_word;
38 static inline _Atomic_word
39 __attribute__ ((__unused__))
40 __exchange_and_add (volatile _Atomic_word* __mem, int __val)
42 _Atomic_word __result;
51 : "+m" (*__mem), "=r" (__result)
52 : "r" (__mem), "rI08" (__val)
60 __attribute__ ((__unused__))
61 __atomic_add (volatile _Atomic_word* __mem, int __val)
69 : "r" (__mem), "rI08" (__val)
75 /* This is generic/atomicity.h */
77 #include <ext/atomicity.h>
78 #include <ext/concurrence.h>
82 __gnu_cxx::__mutex atomic_mutex;
83 } // anonymous namespace
85 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
88 __attribute__ ((__unused__))
89 __exchange_and_add(volatile _Atomic_word* __mem, int __val)
91 __gnu_cxx::__scoped_lock sentry(atomic_mutex);
92 _Atomic_word __result;
99 __attribute__ ((__unused__))
100 __atomic_add(volatile _Atomic_word* __mem, int __val)
101 { __exchange_and_add(__mem, __val); }
103 _GLIBCXX_END_NAMESPACE
105 #endif /* !__SH4A__ */
107 #endif /* atomicity.h */