/usr/include/root/TAtomicCountGcc.h is in libroot-core-dev 5.34.00-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Author: Fons Rademakers 14/11/06
/*************************************************************************
* Copyright (C) 1995-2006, Rene Brun and Fons Rademakers. *
* All rights reserved. *
* *
* For the licensing terms see $ROOTSYS/LICENSE. *
* For the list of contributors see $ROOTSYS/README/CREDITS. *
*************************************************************************/
#ifndef ROOT_TAtomicCountGcc
#define ROOT_TAtomicCountGcc
//////////////////////////////////////////////////////////////////////////
// //
// TAtomicCountGcc //
// //
// Class providing atomic operations on a long. Setting, getting, //
// incrementing and decrementing are atomic, thread safe, operations. //
// //
// This implementation uses GNU libstdc++ v3 atomic primitives, see //
// http://gcc.gnu.org/onlinedocs/porting/Thread-safety.html. //
// //
// ATTENTION: Don't use this file directly, it is included by //
// TAtomicCount.h. //
// //
//////////////////////////////////////////////////////////////////////////
#if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 2) || \
(defined(__APPLE_CC__) && __APPLE_CC__ > 5000 && !defined(MAC_OS_X_VERSION_10_6))
#include <bits/atomicity.h>
#else
#include <ext/atomicity.h>
#endif
#if defined(__GLIBCXX__) // g++ 3.4+
using __gnu_cxx::__atomic_add;
using __gnu_cxx::__exchange_and_add;
#endif
class TAtomicCount {
private:
mutable _Atomic_word fCnt; // counter
TAtomicCount(const TAtomicCount &); // not implemented
TAtomicCount &operator=(const TAtomicCount &); // not implemented
public:
explicit TAtomicCount(Long_t v) : fCnt(v) { }
void operator++() { __atomic_add(&fCnt, 1); }
Long_t operator--() { return __exchange_and_add(&fCnt, -1) - 1; }
operator long() const { return __exchange_and_add(&fCnt, 0); }
void Set(Long_t v) {
fCnt = v;
#ifdef _GLIBCXX_WRITE_MEM_BARRIER
#if !(defined(__INTEL_COMPILER) && defined(__ia64__)) //ICC doesn't support inline asm on IA-64
_GLIBCXX_WRITE_MEM_BARRIER;
#endif
#endif
}
Long_t Get() const { return __exchange_and_add(&fCnt, 0); }
};
#endif
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