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/*
* Copyright 2009 Phil Burk, Mobileer Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.jsyn.research;
import org.junit.jupiter.api.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import static org.junit.jupiter.api.Assertions.assertEquals;
// TODO: Use thread pools, or maybe JMH?
public class BenchMultiThreading {
private static final Logger LOGGER = LoggerFactory.getLogger(BenchMultiThreading.class);
private static final int FRAMES_PER_BLOCK = 64;
int numThreads = 4;
int numLoops = 100000;
private ArrayList<CustomThread> threadList;
static class CustomThread extends Thread {
long frameCount = 0;
long desiredFrame = 0;
Object semaphore = new Object();
Object goSemaphore = new Object();
volatile boolean go = true;
long startNano;
long stopNano;
long maxElapsed;
@Override
public void run() {
try {
startNano = System.nanoTime();
while (go) {
// Watch for long delays.
stopNano = System.nanoTime();
long elapsed = stopNano - startNano;
startNano = System.nanoTime();
if (elapsed > maxElapsed) {
maxElapsed = elapsed;
}
synchronized (semaphore) {
// Audio synthesis would occur here.
frameCount += 1;
// LOGGER.debug( this + " generating frame " +
// frameCount );
semaphore.notify();
}
synchronized (goSemaphore) {
while (desiredFrame <= frameCount) {
goSemaphore.wait();
}
}
long stopNano = System.nanoTime();
}
} catch (InterruptedException e) {
LOGGER.debug("CustomThread interrupted. ");
}
LOGGER.debug("Finishing " + this);
}
public void abort() {
go = false;
interrupt();
}
public void waitForFrame(long targetFrame) throws InterruptedException {
synchronized (semaphore) {
while (frameCount < targetFrame) {
semaphore.wait();
}
}
}
public void generateFrame(long desiredFrame) {
synchronized (goSemaphore) {
this.desiredFrame = desiredFrame;
goSemaphore.notify();
}
}
}
@Test
public void testMultiThreads() {
threadList = new ArrayList<>();
for (int i = 0; i < numThreads; i++) {
CustomThread thread = new CustomThread();
threadList.add(thread);
thread.start();
}
long frameCount = 0;
long startTime = System.currentTimeMillis();
try {
for (int i = 0; i < numLoops; i++) {
frameCount += 1;
waitForThreads(frameCount);
// LOGGER.debug("got frame " + frameCount );
}
} catch (InterruptedException e) {
e.printStackTrace();
}
long stopTime = System.currentTimeMillis();
long elapsedTime = stopTime - startTime;
double elapsedSeconds = 0.001 * elapsedTime;
double blocksPerSecond = numLoops / elapsedSeconds;
System.out.format("blocksPerSecond = %10.3f\n", blocksPerSecond);
double framesPerSecond = blocksPerSecond * FRAMES_PER_BLOCK;
System.out.format("audio framesPerSecond = %10.3f at %d frames per block\n",
framesPerSecond, FRAMES_PER_BLOCK);
for (CustomThread thread : threadList) {
System.out.format("max elapsed time is %d nanos or %f msec\n", thread.maxElapsed,
(thread.maxElapsed / 1000000.0));
}
for (CustomThread thread : threadList) {
assertEquals(frameCount, thread.frameCount, "BlockCount must match ");
thread.abort();
}
}
private void waitForThreads(long frameCount) throws InterruptedException {
for (CustomThread thread : threadList) {
// Ask threads to wake up and generate up to this frame.
thread.generateFrame(frameCount);
}
for (CustomThread thread : threadList) {
// Wait for all the threads to catch up.
thread.waitForFrame(frameCount);
}
}
}
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