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/*
* Quasar: lightweight threads and actors for the JVM.
* Copyright (c) 2013-2014, Parallel Universe Software Co. All rights reserved.
*
* This program and the accompanying materials are dual-licensed under
* either the terms of the Eclipse Public License v1.0 as published by
* the Eclipse Foundation
*
* or (per the licensee's choosing)
*
* under the terms of the GNU Lesser General Public License version 3.0
* as published by the Free Software Foundation.
*/
package co.paralleluniverse.strands;
import co.paralleluniverse.common.monitoring.FlightRecorder;
import co.paralleluniverse.common.monitoring.FlightRecorderMessage;
import co.paralleluniverse.common.util.Debug;
import co.paralleluniverse.fibers.Fiber;
import co.paralleluniverse.fibers.SuspendExecution;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.TimeUnit;
/**
*
* @author pron
*/
public abstract class ConditionSynchronizer implements Condition {
private static final boolean MP = Runtime.getRuntime().availableProcessors() > 1;
private static final int SPINS = MP ? 1 << 6 : 0;
final Object owner;
public ConditionSynchronizer(Object owner) {
this.owner = owner != null ? owner : this;
}
@Override
public void await(int iter) throws InterruptedException, SuspendExecution {
final int spins;
final Fiber fib = Fiber.currentFiber();
if (fib != null) {
spins = 0;
if (iter > 0)
fib.getMonitor().spuriousWakeup();
} else
spins = SPINS - iter;
if (spins > 0) {
if (ThreadLocalRandom.current().nextInt(SPINS) == 0)
Strand.yield();
} else {
if (isRecording())
record("await", "%s parking", Strand.currentStrand());
Strand.park(owner);
if (isRecording())
record("await", "%s awoke", Strand.currentStrand());
}
if (Strand.interrupted())
throw new InterruptedException();
}
public void awaitNanos(int iter, long timeoutNanos) throws InterruptedException, SuspendExecution {
final int spins;
final Fiber fib = Fiber.currentFiber();
if (fib != null) {
spins = 0;
if (iter > 0)
fib.getMonitor().spuriousWakeup();
} else
spins = SPINS - iter;
if (spins > 0) {
if (ThreadLocalRandom.current().nextInt(SPINS) == 0)
Strand.yield();
} else {
if (isRecording())
record("await", "%s parking", Strand.currentStrand());
Strand.parkNanos(owner, timeoutNanos);
if (isRecording())
record("await", "%s awoke", Strand.currentStrand());
}
if (Strand.interrupted())
throw new InterruptedException();
}
@Override
public void await(int iter, long timeout, TimeUnit unit) throws InterruptedException, SuspendExecution {
awaitNanos(iter, unit.toNanos(timeout));
}
////////////////////////////
public static final FlightRecorder RECORDER = Debug.isDebug() ? Debug.getGlobalFlightRecorder() : null;
boolean isRecording() {
return RECORDER != null;
}
static void record(String method, String format) {
if (RECORDER != null)
RECORDER.record(1, new FlightRecorderMessage("ConditionSynchronizer", method, format, null));
}
static void record(String method, String format, Object arg1) {
if (RECORDER != null)
RECORDER.record(1, new FlightRecorderMessage("ConditionSynchronizer", method, format, new Object[]{arg1}));
}
static void record(String method, String format, Object arg1, Object arg2) {
if (RECORDER != null)
RECORDER.record(1, new FlightRecorderMessage("ConditionSynchronizer", method, format, new Object[]{arg1, arg2}));
}
static void record(String method, String format, Object arg1, Object arg2, Object arg3) {
if (RECORDER != null)
RECORDER.record(1, new FlightRecorderMessage("ConditionSynchronizer", method, format, new Object[]{arg1, arg2, arg3}));
}
static void record(String method, String format, Object arg1, Object arg2, Object arg3, Object arg4) {
if (RECORDER != null)
RECORDER.record(1, new FlightRecorderMessage("ConditionSynchronizer", method, format, new Object[]{arg1, arg2, arg3, arg4}));
}
static void record(String method, String format, Object arg1, Object arg2, Object arg3, Object arg4, Object arg5) {
if (RECORDER != null)
RECORDER.record(1, new FlightRecorderMessage("ConditionSynchronizer", method, format, new Object[]{arg1, arg2, arg3, arg4, arg5}));
}
}
