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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;
import android.os.HandlerThread;
/**
* Shared singleton foreground thread for the system. This is a thread for regular
* foreground service operations, which shouldn't be blocked by anything running in
* the background. In particular, the shared background thread could be doing
* relatively long-running operations like saving state to disk (in addition to
* simply being a background priority), which can cause operations scheduled on it
* to be delayed for a user-noticeable amount of time.
*/
public final class FgThread extends HandlerThread {
private static FgThread sInstance;
private static Handler sHandler;
private FgThread() {
super("android.fg", android.os.Process.THREAD_PRIORITY_DEFAULT);
}
private static void ensureThreadLocked() {
if (sInstance == null) {
sInstance = new FgThread();
sInstance.start();
sHandler = new Handler(sInstance.getLooper());
sHandler.post(new Runnable() {
@Override
public void run() {
android.os.Process.setCanSelfBackground(false);
}
});
}
}
public static FgThread get() {
synchronized (UiThread.class) {
ensureThreadLocked();
return sInstance;
}
}
public static Handler getHandler() {
synchronized (UiThread.class) {
ensureThreadLocked();
return sHandler;
}
}
}
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