// Copyright 2014 The Bazel Authors. All rights reserved.
//
// 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.google.devtools.build.lib.util;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Utility methods relating to threads and stack traces.
*/
public class ThreadUtils {
private static final Logger LOG = Logger.getLogger(ThreadUtils.class.getName());
private ThreadUtils() {
}
/** Write a thread dump to the blaze.INFO log if interrupt took too long. */
public static synchronized void warnAboutSlowInterrupt() {
LOG.warning("Interrupt took too long. Dumping thread state.");
for (Map.Entry <Thread, StackTraceElement[]> e : Thread.getAllStackTraces().entrySet()) {
Thread t = e.getKey();
LOG.warning("\"" + t.getName() + "\"" + " "
+ " Thread id=" + t.getId() + " " + t.getState());
for (StackTraceElement line : e.getValue()) {
LOG.warning("\t" + line);
}
LOG.warning("");
}
LoggingUtil.logToRemote(Level.WARNING, "Slow interrupt", new SlowInterruptException());
}
private static final class SlowInterruptException extends RuntimeException {
public SlowInterruptException() {
super("Slow interruption...");
}
}
}