8d044e8bc2
This introduces four generic thread that services can use in the system process: - Background: part of the framework for all processes, for work that is purely background (no timing constraint). - UI: for time-critical display of UI. - Foreground: normal foreground work. - IO: performing IO operations. I went through and moved services into these threads in the places I felt relatively comfortable about understanding what they are doing. There are still a bunch more we need to look at -- lots of networking stuff left, 3 or so different native daemon connectors which I didn't know how much would block, audio stuff, etc. Also updated Watchdog to be aware of and check these new threads, with a new API for other threads to also participate in this checking. Change-Id: Ie2f11061cebde5f018d7383b3a910fbbd11d5e11
66 lines
2.1 KiB
Java
66 lines
2.1 KiB
Java
/*
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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.HandlerThread;
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/**
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* Shared singleton foreground thread for the system. This is a thread for regular
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* foreground service operations, which shouldn't be blocked by anything running in
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* the background. In particular, the shared background thread could be doing
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* relatively long-running operations like saving state to disk (in addition to
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* simply being a background priority), which can cause operations scheduled on it
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* to be delayed for a user-noticeable amount of time.
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*/
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public final class FgThread extends HandlerThread {
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private static FgThread sInstance;
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private static Handler sHandler;
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private FgThread() {
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super("android.fg", android.os.Process.THREAD_PRIORITY_DEFAULT);
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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 FgThread();
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sInstance.start();
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sHandler = new Handler(sInstance.getLooper());
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sHandler.post(new Runnable() {
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@Override
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public void run() {
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android.os.Process.setCanSelfBackground(false);
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}
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});
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}
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}
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public static FgThread get() {
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synchronized (UiThread.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 (UiThread.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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