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/*
* 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 (DisplayThread.class) {
ensureThreadLocked();
return sInstance;
}
}
public static Handler getHandler() {
synchronized (DisplayThread.class) {
ensureThreadLocked();
return sHandler;
}
}
}
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