/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.server;
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import android.os.Handler;
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import android.os.Process;
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import android.os.Trace;
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/**
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* Shared singleton foreground thread for the system. This is a thread for
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* operations that affect what's on the display, which needs to have a minimum
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* of latency. This thread should pretty much only be used by the WindowManager,
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* DisplayManager, and InputManager to perform quick operations in real time.
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*/
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public final class DisplayThread extends ServiceThread {
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private static DisplayThread sInstance;
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private static Handler sHandler;
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private DisplayThread() {
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// DisplayThread runs important stuff, but these are not as important as things running in
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// AnimationThread. Thus, set the priority to one lower.
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super("android.display", Process.THREAD_PRIORITY_DISPLAY + 1, false /*allowIo*/);
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}
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private static void ensureThreadLocked() {
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if (sInstance == null) {
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sInstance = new DisplayThread();
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sInstance.start();
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sInstance.getLooper().setTraceTag(Trace.TRACE_TAG_SYSTEM_SERVER);
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sHandler = new Handler(sInstance.getLooper());
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}
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}
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public static DisplayThread get() {
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synchronized (DisplayThread.class) {
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ensureThreadLocked();
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return sInstance;
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}
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}
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public static Handler getHandler() {
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synchronized (DisplayThread.class) {
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ensureThreadLocked();
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return sHandler;
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}
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}
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}
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