/usr/include/IceUtil/Atomic.h is in libzeroc-ice-dev 3.7.0-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// Copyright (c) 2003-2017 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************
#ifndef ICE_UTIL_ATOMIC_H
#define ICE_UTIL_ATOMIC_H
#if ((defined(ICE_CPP11_COMPILER) && defined(_MSC_VER) && (_MSC_VER > 1600)) || \
(defined(ICE_CPP11_COMPILER) && !defined(_MSC_VER)))
# define ICE_CPP11_COMPILER_HAS_ATOMIC
#endif
#if defined(ICE_CPP11_COMPILER_HAS_ATOMIC)
# include <atomic>
#elif defined(ICE_USE_MUTEX_SHARED)
# include <IceUtil/Mutex.h>
// Using the gcc builtins requires gcc 4.1 or better. For Linux, i386
// doesn't work. Apple is supported for all architectures. Sun only
// supports sparc (32 and 64 bit).
#elif ((defined(__GNUC__) && (((__GNUC__* 100) + __GNUC_MINOR__) >= 401)) || __clang__) && \
((defined(__sun) && (defined(__sparc) || defined(__sparcv9))) || \
defined(__APPLE__) || \
(defined(__linux) && \
(defined(__i486) || defined(__i586) || \
defined(__i686) || defined(__x86_64))))
# define ICE_HAS_GCC_BUILTINS
#elif defined(_WIN32)
// Nothing to include
#else
// Use a simple mutex
# include <IceUtil/Mutex.h>
#endif
namespace IceUtilInternal
{
#ifdef ICE_CPP11_COMPILER_HAS_ATOMIC
typedef std::atomic<int> Atomic;
#else
#if defined(_WIN32)
//
// volatile here is required by InterlockedExchangeXXX
// family functions.
//
# if defined(__MINGW32__) || (defined(_MSC_VER) && (_MSC_VER <= 1500))
typedef volatile LONG ATOMIC_T;
# else
typedef unsigned int ATOMIC_T;
# endif
#else
typedef int ATOMIC_T;
#endif
//
// This is temporary and very partial placeholder for std::atomic,
// which is not yet widely available.
//
class ICE_API Atomic : public IceUtil::noncopyable
{
public:
Atomic() :
_ref(0)
{
}
Atomic(int desired) :
_ref(desired)
{
}
inline int fetch_add(int value)
{
#if defined(_WIN32)
return InterlockedExchangeAdd(&_ref, value);
#elif defined(ICE_HAS_GCC_BUILTINS)
return __sync_fetch_and_add(&_ref, value);
#else
IceUtil::Mutex::Lock sync(_mutex);
int tmp = _ref;
_ref += value;
return tmp;
#endif
}
inline int fetch_sub(int value)
{
#if defined(_WIN32)
# if defined(__MINGW32__) || (defined(_MSC_VER) && (_MSC_VER <= 1500))
return InterlockedExchangeAdd(&_ref, -value);
# else
return InterlockedExchangeSubtract(&_ref, value);
#endif
#elif defined(ICE_HAS_GCC_BUILTINS)
return __sync_fetch_and_sub(&_ref, value);
#else
IceUtil::Mutex::Lock sync(_mutex);
ATOMIC_T tmp = _ref;
_ref -= value;
return tmp;
#endif
}
inline int load() const
{
#if defined(_WIN32)
return InterlockedExchangeAdd(const_cast<ATOMIC_T*>(&_ref), 0);
#elif defined(ICE_HAS_GCC_BUILTINS)
return __sync_fetch_and_add(const_cast<ATOMIC_T*>(&_ref), 0);
#else
IceUtil::Mutex::Lock sync(_mutex);
return _ref;
#endif
}
inline int exchange(int value)
{
#if defined(_WIN32)
return InterlockedExchange(&_ref, value);
#elif defined(ICE_HAS_GCC_BUILTINS)
__sync_synchronize();
return __sync_lock_test_and_set(&_ref, value);
#else
IceUtil::Mutex::Lock sync(_mutex);
int tmp = _ref;
_ref = value;
return tmp;
#endif
}
inline int operator++()
{
return fetch_add(1) + 1;
}
inline int operator--()
{
return fetch_sub(1) - 1;
}
inline int operator++(int)
{
return fetch_add(1);
}
inline int operator--(int)
{
return fetch_sub(1);
}
inline operator int()
{
return load();
}
inline operator int() const
{
return load();
}
private:
ATOMIC_T _ref;
#if !defined(_WIN32) && !defined(ICE_HAS_GCC_BUILTINS)
IceUtil::Mutex _mutex;
#endif
};
#endif
}
#endif
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