Index: talk/app/webrtc/java/android/org/webrtc/ThreadUtils.java |
diff --git a/talk/app/webrtc/java/android/org/webrtc/ThreadUtils.java b/talk/app/webrtc/java/android/org/webrtc/ThreadUtils.java |
new file mode 100644 |
index 0000000000000000000000000000000000000000..bd4fa44b9a8f9e7d289fedecc57dc382378b063a |
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+++ b/talk/app/webrtc/java/android/org/webrtc/ThreadUtils.java |
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+/* |
+ * 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 android.os.Handler; |
+import android.os.SystemClock; |
+ |
+import java.util.concurrent.Callable; |
+import java.util.concurrent.CountDownLatch; |
+import java.util.concurrent.TimeUnit; |
+ |
+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 boolean joinUninterruptibly(final Thread thread, long timeoutMs) { |
+ 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(); |
+ } |
+ |
+ 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(); |
+ } |
+ }); |
+ } |
+ |
+ 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); |
+ } |
+} |