/usr/include/pion/net/TCPTimer.hpp is in libpion-net-dev 4.0.7+dfsg-3.1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// pion-net: a C++ framework for building lightweight HTTP interfaces
// ------------------------------------------------------------------
// Copyright (C) 2007-2010 Atomic Labs, Inc.  (http://www.atomiclabs.com)
//
// Distributed under the Boost Software License, Version 1.0.
// See http://www.boost.org/LICENSE_1_0.txt
//
#ifndef __PION_TCPTIMER_HEADER__
#define __PION_TCPTIMER_HEADER__
#include <boost/asio.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/enable_shared_from_this.hpp>
#include <boost/thread/mutex.hpp>
#include <pion/PionConfig.hpp>
#include <pion/net/TCPConnection.hpp>
namespace pion {	// begin namespace pion
namespace net {		// begin namespace net (Pion Network Library)
///
/// TCPTimer: helper class used to time-out TCP connections
///
class TCPTimer
	: public boost::enable_shared_from_this<TCPTimer>
{
public:
	/**
	 * creates a new TCP connection timer
	 *
	 * @param conn_ptr pointer to TCP connection to monitor
	 */
	TCPTimer(TCPConnectionPtr& conn_ptr);
	/**
	 * starts a timer for closing a TCP connection
	 *
	 * @param seconds number of seconds before the timeout triggers
	 */
	void start(const boost::uint32_t seconds);
	/// cancel the timer (operation completed)
	void cancel(void);
private:
	/**
	 * Callback handler for the deadline timer
	 *
	 * @param ec deadline timer error status code
	 */
	void timerCallback(const boost::system::error_code& ec);
	/// pointer to the TCP connection that is being monitored
	TCPConnectionPtr						m_conn_ptr;
	/// deadline timer used to timeout TCP operations
	boost::asio::deadline_timer				m_timer;
	
	/// mutex used to synchronize the TCP connection timer
	boost::mutex							m_mutex;
	/// true if the deadline timer is active
	bool									m_timer_active;	
	/// true if the timer was cancelled (operation completed)
	bool									m_was_cancelled;	
};
/// shared pointer to a TCPTimer object
typedef boost::shared_ptr<TCPTimer>		TCPTimerPtr;
}	// end namespace net
}	// end namespace pion
#endif
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