Introduce android.anim thread in system_server
We create a new thread on which everything is running that
directly impacts window animations, i.e. layout, anim tick and
starting window creation. This is such that any work on
android.display can not lead to jank in the window animation,
specifically lock contention on activity manager lock that blocks
callbacks from android.display into AM can not lead to window
animation jank.
Test: Run animation, take systrace, make sure animation is on
android.anim
Test: AppWindowContainerControllerTestTest: AppWindowContainerControllerTestss
Fixes: 36792959
Change-Id: I5d41419a709b7984724e7053a3afdcc1ffe1aaa2
diff --git a/services/core/java/com/android/server/AnimationThread.java b/services/core/java/com/android/server/AnimationThread.java
new file mode 100644
index 0000000..08392b0
--- /dev/null
+++ b/services/core/java/com/android/server/AnimationThread.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * 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.android.server;
+
+import static android.os.Process.THREAD_PRIORITY_DISPLAY;
+
+import android.os.Handler;
+import android.os.Trace;
+
+/**
+ * Thread for handling all window animations, or anything that's directly impacting animations like
+ * starting windows or traversals.
+ */
+public final class AnimationThread extends ServiceThread {
+ private static AnimationThread sInstance;
+ private static Handler sHandler;
+
+ private AnimationThread() {
+ super("android.anim", THREAD_PRIORITY_DISPLAY, false /*allowIo*/);
+ }
+
+ private static void ensureThreadLocked() {
+ if (sInstance == null) {
+ sInstance = new AnimationThread();
+ sInstance.start();
+ sInstance.getLooper().setTraceTag(Trace.TRACE_TAG_WINDOW_MANAGER);
+ sHandler = new Handler(sInstance.getLooper());
+ }
+ }
+
+ public static AnimationThread get() {
+ synchronized (AnimationThread.class) {
+ ensureThreadLocked();
+ return sInstance;
+ }
+ }
+
+ public static Handler getHandler() {
+ synchronized (AnimationThread.class) {
+ ensureThreadLocked();
+ return sHandler;
+ }
+ }
+}