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#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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