1 files changed, 50 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/util/ThreadUtils.java b/src/main/java/com/google/devtools/build/lib/util/ThreadUtils.java
new file mode 100644
index 0000000000..7b8ebed8bd
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+++ b/src/main/java/com/google/devtools/build/lib/util/ThreadUtils.java
@@ -0,0 +1,50 @@
+// Copyright 2014 Google Inc. 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 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...");
+    }
+  }
+}