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/*
* Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#ifndef SHARE_RUNTIME_TIMER_HPP
#define SHARE_RUNTIME_TIMER_HPP
#include "utilities/globalDefinitions.hpp"
// Timers for simple measurement.
class elapsedTimer {
friend class VMStructs;
private:
jlong _counter;
jlong _start_counter;
bool _active;
public:
elapsedTimer() { _active = false; reset(); }
void add(elapsedTimer t);
void add_nanoseconds(jlong ns);
void start();
void stop();
void reset() { _counter = 0; }
double seconds() const;
jlong milliseconds() const;
jlong ticks() const { return _counter; }
jlong active_ticks() const;
bool is_active() const { return _active; }
};
// TimeStamp is used for recording when an event took place.
class TimeStamp {
private:
jlong _counter;
public:
TimeStamp() { _counter = 0; }
// has the timestamp been updated since being created or cleared?
bool is_updated() const { return _counter != 0; }
// update to current elapsed time
void update();
// update to given elapsed time
void update_to(jlong ticks);
// returns seconds since updated
// (must not be in a cleared state: must have been previously updated)
double seconds() const;
jlong milliseconds() const;
// ticks elapsed between VM start and last update
jlong ticks() const { return _counter; }
// ticks elapsed since last update
jlong ticks_since_update() const;
};
class TimeHelper {
public:
static double counter_to_seconds(jlong counter);
static double counter_to_millis(jlong counter);
static jlong millis_to_counter(jlong millis);
static jlong micros_to_counter(jlong micros);
};
#endif // SHARE_RUNTIME_TIMER_HPP
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