/usr/include/simgear/structure/SGAtomic.hxx is in libsimgear-dev 3.0.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 | /* -*-c++-*-
*
* Copyright (C) 2005-2009,2011 Mathias Froehlich
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#ifndef SGAtomic_HXX
#define SGAtomic_HXX
#if defined(__GNUC__) && ((4 < __GNUC__)||(4 == __GNUC__ && 1 <= __GNUC_MINOR__)) && \
defined(__x86_64__)
// No need to include something. Is a Compiler API ...
# define SGATOMIC_USE_GCC4_BUILTINS
#elif defined(__GNUC__) && defined(__i386__)
# define SGATOMIC_USE_LIBRARY_FUNCTIONS
#elif defined(__sgi) && defined(_COMPILER_VERSION) && (_COMPILER_VERSION>=730)
// No need to include something. Is a Compiler API ...
# define SGATOMIC_USE_MIPSPRO_BUILTINS
#elif defined(_WIN32)
# define SGATOMIC_USE_LIBRARY_FUNCTIONS
#else
// The sledge hammer ...
# define SGATOMIC_USE_LIBRARY_FUNCTIONS
# define SGATOMIC_USE_MUTEX
# include <simgear/threads/SGThread.hxx>
#endif
class SGAtomic {
public:
SGAtomic(unsigned value = 0) : mValue(value)
{ }
#if defined(SGATOMIC_USE_LIBRARY_FUNCTIONS)
unsigned operator++();
#else
unsigned operator++()
{
# if defined(SGATOMIC_USE_GCC4_BUILTINS)
return __sync_add_and_fetch(&mValue, 1);
# elif defined(SGATOMIC_USE_MIPOSPRO_BUILTINS)
return __add_and_fetch(&mValue, 1);
# else
# error
# endif
}
#endif
#if defined(SGATOMIC_USE_LIBRARY_FUNCTIONS)
unsigned operator--();
#else
unsigned operator--()
{
# if defined(SGATOMIC_USE_GCC4_BUILTINS)
return __sync_sub_and_fetch(&mValue, 1);
# elif defined(SGATOMIC_USE_MIPOSPRO_BUILTINS)
return __sub_and_fetch(&mValue, 1);
# else
# error
# endif
}
#endif
#if defined(SGATOMIC_USE_LIBRARY_FUNCTIONS)
operator unsigned() const;
#else
operator unsigned() const
{
# if defined(SGATOMIC_USE_GCC4_BUILTINS)
__sync_synchronize();
return mValue;
# elif defined(SGATOMIC_USE_MIPOSPRO_BUILTINS)
__synchronize();
return mValue;
# else
# error
# endif
}
#endif
#if defined(SGATOMIC_USE_LIBRARY_FUNCTIONS)
bool compareAndExchange(unsigned oldValue, unsigned newValue);
#else
bool compareAndExchange(unsigned oldValue, unsigned newValue)
{
# if defined(SGATOMIC_USE_GCC4_BUILTINS)
return __sync_bool_compare_and_swap(&mValue, oldValue, newValue);
# elif defined(SGATOMIC_USE_MIPOSPRO_BUILTINS)
return __compare_and_swap(&mValue, oldValue, newValue);
# else
# error
# endif
}
#endif
private:
SGAtomic(const SGAtomic&);
SGAtomic& operator=(const SGAtomic&);
#if defined(SGATOMIC_USE_MUTEX)
mutable SGMutex mMutex;
#endif
unsigned mValue;
};
namespace simgear
{
// Typesafe wrapper around SGSwappable
template <typename T>
class Swappable : private SGAtomic
{
public:
Swappable(const T& value) : SGAtomic(static_cast<unsigned>(value))
{
}
T operator() () const
{
return static_cast<T>(SGAtomic::operator unsigned ());
}
Swappable& operator=(const Swappable& rhs)
{
for (unsigned oldval = unsigned(*this);
!compareAndExchange(oldval, unsigned(rhs));
oldval = unsigned(*this))
;
return *this;
}
bool compareAndSwap(const T& oldVal, const T& newVal)
{
return SGAtomic::compareAndExchange(static_cast<unsigned>(oldVal),
static_cast<unsigned>(newVal));
}
};
}
#endif
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