Refactor display manager service to new pattern.
Transform DisplayManagerService into a SystemService and start cleaning
up other local services that it uses from window manager and input manager.
Clean up service thread initialization.
Remove unnecessary static variables from ActivityManagerService.
It's starting to become clear that we really need a better way to manage
service dependencies. Boot phases don't quite cut it.
Change-Id: If319dbd7cbfbd4812fe55ece969e818d4b20755b
diff --git a/services/core/java/com/android/server/DisplayThread.java b/services/core/java/com/android/server/DisplayThread.java
new file mode 100644
index 0000000..528ba0a
--- /dev/null
+++ b/services/core/java/com/android/server/DisplayThread.java
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2013 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 android.os.Handler;
+
+/**
+ * Shared singleton foreground thread for the system. This is a thread for
+ * operations that affect what's on the display, which needs to have a minimum
+ * of latency. This thread should pretty much only be used by the WindowManager,
+ * DisplayManager, and InputManager to perform quick operations in real time.
+ */
+public final class DisplayThread extends ServiceThread {
+ private static DisplayThread sInstance;
+ private static Handler sHandler;
+
+ private DisplayThread() {
+ super("android.display", android.os.Process.THREAD_PRIORITY_DISPLAY, false /*allowIo*/);
+ }
+
+ private static void ensureThreadLocked() {
+ if (sInstance == null) {
+ sInstance = new DisplayThread();
+ sInstance.start();
+ sHandler = new Handler(sInstance.getLooper());
+ }
+ }
+
+ public static DisplayThread get() {
+ synchronized (UiThread.class) {
+ ensureThreadLocked();
+ return sInstance;
+ }
+ }
+
+ public static Handler getHandler() {
+ synchronized (UiThread.class) {
+ ensureThreadLocked();
+ return sHandler;
+ }
+ }
+}