//------------------------------------------------------------------------------
/*
	Copyright (c) 2011-2013, OpenCoin, Inc.

	Permission to use, copy, modify, and/or distribute this software for any
	purpose with  or without fee is hereby granted,  provided that the above
	copyright notice and this permission notice appear in all copies.

	THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES OF
	MERCHANTABILITY  AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	ANY SPECIAL,  DIRECT, INDIRECT,  OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	WHATSOEVER  RESULTING  FROM LOSS OF USE, DATA OR PROFITS,  WHETHER IN AN
	ACTION OF CONTRACT, NEGLIGENCE  OR OTHER TORTIOUS ACTION, ARISING OUT OF
	OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================

#ifndef RIPPLE_UPTIMETIMER_H
#define RIPPLE_UPTIMETIMER_H

/** Tracks program uptime.

	The timer can be switched to a manual system of updating, to reduce
	system calls. (?)
*/
// VFALCO TODO determine if the non-manual timing is actually needed
class UptimeTimer
{
private:
	UptimeTimer ();
	~UptimeTimer ();

public:
	int getElapsedSeconds () const;

	void beginManualUpdates ();
	void endManualUpdates ();

	void incrementElapsedTime ();

	static UptimeTimer& getInstance ();

private:
	// VFALCO DEPRECATED, Use a memory barrier instead of forcing a cache line
	int m_pad1; // make sure m_elapsedTime fits in its own cache line
	int volatile m_elapsedTime;
	int m_pad2;

	time_t m_startTime;

	bool m_isUpdatingManually;
};

#endif