// Copyright (C) 2017-2021  Nexedi SA and Contributors.
//                          Kirill Smelkov <kirr@nexedi.com>
//
// This program is free software: you can Use, Study, Modify and Redistribute
// it under the terms of the GNU General Public License version 3, or (at your
// option) any later version, as published by the Free Software Foundation.
//
// You can also Link and Combine this program with other software covered by
// the terms of any of the Free Software licenses or any of the Open Source
// Initiative approved licenses and Convey the resulting work. Corresponding
// source of such a combination shall include the source code for all other
// software used.
//
// This program is distributed WITHOUT ANY WARRANTY; without even the implied
// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
//
// See COPYING file for full licensing terms.
// See https://www.nexedi.com/licensing for rationale and options.

// Package xtime complements standard package time.
package xtime

import (
	"time"
)

// Mono returns time passed since program start.
// It uses monothonic time for measurments and is robust to OS clock adjustments
//
// XXX better return time.Duration?
func Mono() float64 {
	// time.Sub uses monotonic clock readings for the difference
	return time.Now().Sub(tstart).Seconds()
}

// FIXME py retruns it since epoch
var tstart time.Time = time.Now()
