/usr/include/boost/smart_ptr/detail/atomic_count_pthreads.hpp is in libboost1.55-dev 1.55.0+dfsg-3.
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 | #ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_PTHREADS_HPP_INCLUDED
#define BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_PTHREADS_HPP_INCLUDED
//
// boost/detail/atomic_count_pthreads.hpp
//
// Copyright (c) 2001, 2002 Peter Dimov and Multi Media Ltd.
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
#include <pthread.h>
//
// The generic pthread_mutex-based implementation sometimes leads to
// inefficiencies. Example: a class with two atomic_count members
// can get away with a single mutex.
//
// Users can detect this situation by checking BOOST_AC_USE_PTHREADS.
//
namespace boost
{
namespace detail
{
class atomic_count
{
private:
class scoped_lock
{
public:
scoped_lock(pthread_mutex_t & m): m_(m)
{
pthread_mutex_lock(&m_);
}
~scoped_lock()
{
pthread_mutex_unlock(&m_);
}
private:
pthread_mutex_t & m_;
};
public:
explicit atomic_count(long v): value_(v)
{
pthread_mutex_init(&mutex_, 0);
}
~atomic_count()
{
pthread_mutex_destroy(&mutex_);
}
long operator++()
{
scoped_lock lock(mutex_);
return ++value_;
}
long operator--()
{
scoped_lock lock(mutex_);
return --value_;
}
operator long() const
{
scoped_lock lock(mutex_);
return value_;
}
private:
atomic_count(atomic_count const &);
atomic_count & operator=(atomic_count const &);
mutable pthread_mutex_t mutex_;
long value_;
};
} // namespace detail
} // namespace boost
#endif // #ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_PTHREADS_HPP_INCLUDED
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