| Index: talk/app/webrtc/java/android/org/webrtc/ThreadUtils.java
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| diff --git a/talk/app/webrtc/java/android/org/webrtc/ThreadUtils.java b/talk/app/webrtc/java/android/org/webrtc/ThreadUtils.java
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| new file mode 100644
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| index 0000000000000000000000000000000000000000..bd4fa44b9a8f9e7d289fedecc57dc382378b063a
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| --- /dev/null
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| +++ b/talk/app/webrtc/java/android/org/webrtc/ThreadUtils.java
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| @@ -0,0 +1,192 @@
|
| +/*
|
| + * libjingle
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| + * 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,
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| + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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| + * 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.
|
| + */
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| +
|
| +package org.webrtc;
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| +
|
| +import android.os.Handler;
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| +import android.os.SystemClock;
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| +
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| +import java.util.concurrent.Callable;
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| +import java.util.concurrent.CountDownLatch;
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| +import java.util.concurrent.TimeUnit;
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| +
|
| +final class ThreadUtils {
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| + /**
|
| + * 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();
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| +
|
| + public void checkIsOnValidThread() {
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| + if (thread == null) {
|
| + thread = Thread.currentThread();
|
| + }
|
| + if (Thread.currentThread() != thread) {
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| + throw new IllegalStateException("Wrong thread");
|
| + }
|
| + }
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| +
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| + public void detachThread() {
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| + thread = null;
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| + }
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| + }
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| +
|
| + /**
|
| + * Utility interface to be used with executeUninterruptibly() to wait for blocking operations
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| + * to complete without getting interrupted..
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| + */
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| + public interface BlockingOperation {
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| + void run() throws InterruptedException;
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| + }
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| +
|
| + /**
|
| + * Utility method to make sure a blocking operation is executed to completion without getting
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| + * 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
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| + * the blocking operation, this function will re-run the operation until completion, and only then
|
| + * re-interrupt the thread.
|
| + */
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| + public static void executeUninterruptibly(BlockingOperation operation) {
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| + 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) {
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| + Thread.currentThread().interrupt();
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| + }
|
| + }
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| +
|
| + public static boolean joinUninterruptibly(final Thread thread, long timeoutMs) {
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| + final long startTimeMs = SystemClock.elapsedRealtime();
|
| + long timeRemainingMs = timeoutMs;
|
| + boolean wasInterrupted = false;
|
| + while (timeRemainingMs > 0) {
|
| + try {
|
| + thread.join(timeRemainingMs);
|
| + 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;
|
| + final long elapsedTimeMs = SystemClock.elapsedRealtime() - startTimeMs;
|
| + timeRemainingMs = timeoutMs - elapsedTimeMs;
|
| + }
|
| + }
|
| + // Pass interruption information along.
|
| + if (wasInterrupted) {
|
| + Thread.currentThread().interrupt();
|
| + }
|
| + return !thread.isAlive();
|
| + }
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| +
|
| + public static void joinUninterruptibly(final Thread thread) {
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| + executeUninterruptibly(new BlockingOperation() {
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| + @Override
|
| + public void run() throws InterruptedException {
|
| + thread.join();
|
| + }
|
| + });
|
| + }
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| +
|
| + public static void awaitUninterruptibly(final CountDownLatch latch) {
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| + executeUninterruptibly(new BlockingOperation() {
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| + @Override
|
| + public void run() throws InterruptedException {
|
| + latch.await();
|
| + }
|
| + });
|
| + }
|
| +
|
| + public static boolean awaitUninterruptibly(CountDownLatch barrier, long timeoutMs) {
|
| + final long startTimeMs = SystemClock.elapsedRealtime();
|
| + long timeRemainingMs = timeoutMs;
|
| + boolean wasInterrupted = false;
|
| + boolean result = false;
|
| + do {
|
| + try {
|
| + result = barrier.await(timeRemainingMs, TimeUnit.MILLISECONDS);
|
| + 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;
|
| + final long elapsedTimeMs = SystemClock.elapsedRealtime() - startTimeMs;
|
| + timeRemainingMs = timeoutMs - elapsedTimeMs;
|
| + }
|
| + } while (timeRemainingMs > 0);
|
| + // Pass interruption information along.
|
| + if (wasInterrupted) {
|
| + Thread.currentThread().interrupt();
|
| + }
|
| + return result;
|
| + }
|
| +
|
| + /**
|
| + * Post |callable| to |handler| and wait for the result.
|
| + */
|
| + public static <V> V invokeUninterruptibly(final Handler handler, final Callable<V> callable) {
|
| + class Result {
|
| + public V value;
|
| + }
|
| + final Result result = new Result();
|
| + final CountDownLatch barrier = new CountDownLatch(1);
|
| + handler.post(new Runnable() {
|
| + @Override public void run() {
|
| + try {
|
| + result.value = callable.call();
|
| + } catch (Exception e) {
|
| + throw new RuntimeException("Callable threw exception: " + e);
|
| + }
|
| + barrier.countDown();
|
| + }
|
| + });
|
| + awaitUninterruptibly(barrier);
|
| + return result.value;
|
| + }
|
| +
|
| + /**
|
| + * Post |runner| to |handler| and wait for the result.
|
| + */
|
| + public static void invokeUninterruptibly(final Handler handler, final Runnable runner) {
|
| + final CountDownLatch barrier = new CountDownLatch(1);
|
| + handler.post(new Runnable() {
|
| + @Override public void run() {
|
| + runner.run();
|
| + barrier.countDown();
|
| + }
|
| + });
|
| + awaitUninterruptibly(barrier);
|
| + }
|
| +}
|
|
|