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/**
* Author: Sven Gothel <sgothel@jausoft.com>
* Copyright (c) 2020-2023 Gothel Software e.K.
* Copyright (c) 2020-2023 JogAmp Community.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package com.jogamp.common.os;
import java.time.Instant;
public class Clock {
private static long t0;
static {
Platform.initSingleton(); // loads native gluegen_rt library
t0 = currentTimeMillis();
}
/**
* Returns current monotonic time since Unix Epoch `00:00:00 UTC on 1970-01-01`.
*
* Returned fraction_timespec is passing machine precision and range of the underlying native API.
*
* Monotonic time shall be used for high-performance measurements of durations,
* since the underlying OS shall support fast calls.
*
* @see getWallClockTime()
*/
public static Instant getMonotonicTime() {
final long[/*2*/] val = { 0, 0 };
getMonotonicTimeImpl(val);
return Instant.ofEpochSecond(val[0], val[1]);
}
private static native void getMonotonicTimeImpl(final long[/*2*/] val);
/**
* Returns current wall-clock real-time since Unix Epoch `00:00:00 UTC on 1970-01-01`.
*
* Returned Instant is passing machine precision and range of the underlying native API.
*
* Wall-Clock time shall be used for accurate measurements of the actual time only,
* since the underlying OS unlikely supports fast calls.
*
* @see getMonotonicTime()
*/
public static Instant getWallClockTime() {
final long[/*2*/] val = { 0, 0 };
getWallClockTimeImpl(val);
return Instant.ofEpochSecond(val[0], val[1]);
}
private static native void getWallClockTimeImpl(final long[/*2*/] val);
/**
* Returns current monotonic time in milliseconds.
*/
public static native long currentTimeMillis();
/**
* Returns current wall-clock system `time of day` in seconds since Unix Epoch
* `00:00:00 UTC on 1 January 1970`.
*/
public static native long wallClockSeconds();
/**
* Returns the startup time in monotonic time in milliseconds of the native module.
*/
public static long startupTimeMillis() { return t0; }
/**
* Returns current elapsed monotonic time in milliseconds since module startup, see {@link #startupTimeMillis()}.
*/
public static long elapsedTimeMillis() { return currentTimeMillis() - t0; }
/**
* Returns elapsed monotonic time in milliseconds since module startup comparing against the given timestamp, see {@link #startupTimeMillis()}.
*/
public static long elapsedTimeMillis(final long current_ts) { return current_ts - t0; }
}
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