/usr/include/asio/detail/std_mutex.hpp is in libasio-dev 1:1.10.8-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// detail/std_mutex.hpp
// ~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// 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)
//
#ifndef ASIO_DETAIL_STD_MUTEX_HPP
#define ASIO_DETAIL_STD_MUTEX_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#if defined(ASIO_HAS_STD_MUTEX_AND_CONDVAR)
#include <mutex>
#include "asio/detail/noncopyable.hpp"
#include "asio/detail/scoped_lock.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
class std_event;
class std_mutex
: private noncopyable
{
public:
typedef asio::detail::scoped_lock<std_mutex> scoped_lock;
// Constructor.
std_mutex()
{
}
// Destructor.
~std_mutex()
{
}
// Lock the mutex.
void lock()
{
mutex_.lock();
}
// Unlock the mutex.
void unlock()
{
mutex_.unlock();
}
private:
friend class std_event;
std::mutex mutex_;
};
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // defined(ASIO_HAS_STD_MUTEX_AND_CONDVAR)
#endif // ASIO_DETAIL_STD_MUTEX_HPP
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