/*
* Copyright 2000-2016 JetBrains s.r.o.
*
* 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.intellij.concurrency;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.ForkJoinWorkerThread;
import java.util.concurrent.atomic.AtomicLong;
// must be accessible via "ClassLoader.getSystemClassLoader().loadClass(fp).newInstance()" from java.util.concurrent.ForkJoinPool.makeCommonPool()
public class IdeaForkJoinWorkerThreadFactory implements ForkJoinPool.ForkJoinWorkerThreadFactory {
private static final int PARALLELISM = Runtime.getRuntime().availableProcessors();
// must be called in the earliest possible moment on startup
public static void setupForkJoinCommonPool() {
System.setProperty("java.util.concurrent.ForkJoinPool.common.parallelism", String.valueOf(PARALLELISM));
System.setProperty("java.util.concurrent.ForkJoinPool.common.threadFactory", IdeaForkJoinWorkerThreadFactory.class.getName());
}
private static final AtomicLong bits = new AtomicLong();
@Override
public ForkJoinWorkerThread newThread(ForkJoinPool pool) {
final int n = setNextBit();
ForkJoinWorkerThread thread = new ForkJoinWorkerThread(pool) {
@Override
protected void onTermination(Throwable exception) {
clearBit(n);
super.onTermination(exception);
}
};
thread.setName("JobScheduler FJ pool " + n + "/" + PARALLELISM);
thread.setPriority(Thread.NORM_PRIORITY - 1);
return thread;
}
private static int setNextBit() {
long oldValue = bits.getAndUpdate(value -> value + 1 | value);
return Long.numberOfTrailingZeros(oldValue + 1);
}
private static void clearBit(int n) {
bits.updateAndGet(value -> value & ~(1L << n));
}
}