| /* |
| * libjingle |
| * Copyright 2015 Google Inc. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * 3. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
| * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
| * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| package org.webrtc; |
| |
| import java.util.concurrent.CountDownLatch; |
| |
| final class ThreadUtils { |
| /** |
| * Utility class to be used for checking that a method is called on the correct thread. |
| */ |
| public static class ThreadChecker { |
| private Thread thread = Thread.currentThread(); |
| |
| public void checkIsOnValidThread() { |
| if (thread == null) { |
| thread = Thread.currentThread(); |
| } |
| if (Thread.currentThread() != thread) { |
| throw new IllegalStateException("Wrong thread"); |
| } |
| } |
| |
| public void detachThread() { |
| thread = null; |
| } |
| } |
| |
| /** |
| * Utility interface to be used with executeUninterruptibly() to wait for blocking operations |
| * to complete without getting interrupted.. |
| */ |
| public interface BlockingOperation { |
| void run() throws InterruptedException; |
| } |
| |
| /** |
| * Utility method to make sure a blocking operation is executed to completion without getting |
| * interrupted. This should be used in cases where the operation is waiting for some critical |
| * work, e.g. cleanup, that must complete before returning. If the thread is interrupted during |
| * the blocking operation, this function will re-run the operation until completion, and only then |
| * re-interrupt the thread. |
| */ |
| public static void executeUninterruptibly(BlockingOperation operation) { |
| boolean wasInterrupted = false; |
| while (true) { |
| try { |
| operation.run(); |
| break; |
| } catch (InterruptedException e) { |
| // Someone is asking us to return early at our convenience. We can't cancel this operation, |
| // but we should preserve the information and pass it along. |
| wasInterrupted = true; |
| } |
| } |
| // Pass interruption information along. |
| if (wasInterrupted) { |
| Thread.currentThread().interrupt(); |
| } |
| } |
| |
| public static void joinUninterruptibly(final Thread thread) { |
| executeUninterruptibly(new BlockingOperation() { |
| @Override |
| public void run() throws InterruptedException { |
| thread.join(); |
| } |
| }); |
| } |
| |
| public static void awaitUninterruptibly(final CountDownLatch latch) { |
| executeUninterruptibly(new BlockingOperation() { |
| @Override |
| public void run() throws InterruptedException { |
| latch.await(); |
| } |
| }); |
| } |
| } |