/usr/include/omnithread/atomic.h is in libomnithread4-dev 4.2.2-0.8.
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 | // -*- Mode: C++; -*-
// Package : omnithread
// omnithread/atomic.h Created : 2011/04/14 dgrisby
//
// Copyright (C) 2011 Apasphere Ltd
//
// This file is part of the omnithread library
//
// The omnithread library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library. If not, see http://www.gnu.org/licenses/
//
//
// Atomic operations for platforms that support them.
#ifndef __omnithread_atomic_h_
#define __omnithread_atomic_h_
#ifdef OMNI_HAVE_SYNC_ADD_AND_FETCH
# define OMNI_REFCOUNT_DEFINED
class _OMNITHREAD_NTDLL_ omni_refcount {
public:
inline omni_refcount(int start) : count(start) {}
inline ~omni_refcount() {}
// Atomically increment reference count and return new value
inline int inc() {
return __sync_add_and_fetch(&count, 1);
}
// Atomically decrement reference count and return new value
inline int dec() {
return __sync_sub_and_fetch(&count, 1);
}
// Return snapshot of current value. Real count may have changed by
// the time the value is looked at!
inline int value() {
return count;
}
private:
volatile int count;
};
#endif // OMNI_ATOMIC_GCC_SYNC
#if defined(_MSC_VER) && !defined(OMNI_REFCOUNT_DEFINED)
# define OMNI_REFCOUNT_DEFINED
class _OMNITHREAD_NTDLL_ omni_refcount {
public:
inline omni_refcount(int start) : count(start) {}
inline ~omni_refcount() {}
// Atomically increment reference count and return new value
inline int inc() {
return InterlockedIncrement(&count);
}
// Atomically decrement reference count and return new value
inline int dec() {
return InterlockedDecrement(&count);
}
// Return snapshot of current value. Real count may have changed by
// the time the value is looked at!
inline int value() {
return count;
}
private:
volatile LONG count;
};
#endif // _MSC_VER
#endif // __omnithread_atomic_h_
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