18d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn/* 28d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * Copyright (C) 2013 The Android Open Source Project 38d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * 48d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * Licensed under the Apache License, Version 2.0 (the "License"); 58d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * you may not use this file except in compliance with the License. 68d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * You may obtain a copy of the License at 78d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * 88d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * http://www.apache.org/licenses/LICENSE-2.0 98d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * 108d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * Unless required by applicable law or agreed to in writing, software 118d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * distributed under the License is distributed on an "AS IS" BASIS, 128d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 138d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * See the License for the specific language governing permissions and 148d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * limitations under the License. 158d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn */ 168d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn 178d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackbornpackage com.android.internal.os; 188d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn 198d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackbornimport android.os.Handler; 208d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackbornimport android.os.HandlerThread; 21712886fd979f58b0de7cefc3bce885ad7f4493b6Makoto Onukiimport android.os.Looper; 2274cd3de6f4889d54a3da930de5e7ad00b97f03e9Jeff Sharkeyimport android.os.Trace; 238d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn 248d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn/** 258d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn * Shared singleton background thread for each process. 268d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn */ 278d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackbornpublic final class BackgroundThread extends HandlerThread { 28712886fd979f58b0de7cefc3bce885ad7f4493b6Makoto Onuki private static final long SLOW_DISPATCH_THRESHOLD_MS = 10_000; 29712886fd979f58b0de7cefc3bce885ad7f4493b6Makoto Onuki private static final long SLOW_DELIVERY_THRESHOLD_MS = 30_000; 308d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn private static BackgroundThread sInstance; 318d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn private static Handler sHandler; 328d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn 338d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn private BackgroundThread() { 348d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn super("android.bg", android.os.Process.THREAD_PRIORITY_BACKGROUND); 358d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn } 368d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn 378d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn private static void ensureThreadLocked() { 388d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn if (sInstance == null) { 398d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn sInstance = new BackgroundThread(); 408d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn sInstance.start(); 41712886fd979f58b0de7cefc3bce885ad7f4493b6Makoto Onuki final Looper looper = sInstance.getLooper(); 42712886fd979f58b0de7cefc3bce885ad7f4493b6Makoto Onuki looper.setTraceTag(Trace.TRACE_TAG_SYSTEM_SERVER); 43712886fd979f58b0de7cefc3bce885ad7f4493b6Makoto Onuki looper.setSlowLogThresholdMs( 44712886fd979f58b0de7cefc3bce885ad7f4493b6Makoto Onuki SLOW_DISPATCH_THRESHOLD_MS, SLOW_DELIVERY_THRESHOLD_MS); 458d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn sHandler = new Handler(sInstance.getLooper()); 468d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn } 478d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn } 488d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn 498d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn public static BackgroundThread get() { 508d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn synchronized (BackgroundThread.class) { 518d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn ensureThreadLocked(); 528d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn return sInstance; 538d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn } 548d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn } 558d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn 568d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn public static Handler getHandler() { 578d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn synchronized (BackgroundThread.class) { 588d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn ensureThreadLocked(); 598d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn return sHandler; 608d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn } 618d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn } 628d044e8bc287c1a567d82aedbe30085b011544c3Dianne Hackborn} 63