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
36typedef int _Atomic_word;
37
38static inline _Atomic_word
39__attribute__ ((__unused__))
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
59static inline void
60__attribute__ ((__unused__))
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
80namespace
81{
82  __gnu_cxx::__mutex atomic_mutex;
83} // anonymous namespace
84
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__))
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