// Copyright 2016 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.runtime; import com.google.devtools.build.lib.server.signal.AbstractSignalHandler; import com.google.devtools.build.lib.util.ExitCode; import com.google.devtools.build.lib.util.OS; import com.google.devtools.build.lib.util.io.OutErr; import sun.misc.Signal; import java.util.logging.Logger; /** * Class that causes Blaze to exit with {@link ExitCode#OOM_ERROR} when the JVM receives a * {@code SIGUSR2} signal. * *
The Blaze client can be configured to send {@code SIGUSR2} on an OOM.
*/
class OomSignalHandler extends AbstractSignalHandler {
private static final Logger LOG = Logger.getLogger(OomSignalHandler.class.getName());
private static final Signal SIGUSR2 = (OS.getCurrent() != OS.WINDOWS) ? new Signal("USR2") : null;
private static final String MESSAGE = "SIGUSR2 received, presumably from JVM due to OOM";
// Pre-allocate memory for object that will be used during an OOM, because there may not be spare
// memory when we're OOMing. That's kind of the point of an OOM.
private static final OutOfMemoryError OUT_OF_MEMORY_ERROR =
withNoStack(new OutOfMemoryError(MESSAGE));
private static