Thread
# ps -T 969
1 969 Runnable 539 663 main
*2 977 Wait 0 0 Signal Catcher
*3 978 Runnable 0 0
*4 979 Runnable 37 623 ADB-JDWP Connection Control Thread
*5 980 Runnable 208 180 Jit thread pool worker thread 0
*6 981 Wait 5351 1483 HeapTaskDaemon
*7 982 Wait 541 1911 ReferenceQueueDaemon
*8 983 Wait 28 29 FinalizerDaemon
*9 984 Wait 4 13 FinalizerWatchdogDaemon
10 989 Runnable 3652 4364 Binder:969_1
11 990 Runnable 5743 6888 Binder:969_2
12 1009 Runnable 679 659 android.fg
13 1010 Runnable 2028 3703 android.ui
14 1011 Runnable 27 109 android.io
15 1012 Runnable 89 111 android.display
16 1013 Runnable 245 217 android.anim
17 1014 Runnable 41 79 android.anim.lf
18 1015 Wait 29 139 watchdog
19 2776 Runnable 0 0 OsuServerHandler
20 1020 Runnable 3631 6663 android.bg
21 1022 Runnable 42 130 HwBinder:969_1
22 1026 Runnable 1060 2220 ActivityManager
23 1027 Runnable 2645 4393 ActivityManager:procStart
24 1030 Runnable 1687 9002 ActivityManager:kill
25 1031 Runnable 1205 1533 ActivityManager:killHandler
26 1033 Runnable 19 383 OomAdjuster
27 1032 Runnable 0 0 Thread-2
28 1040 Wait 388 90 batterystats-worker
29 1090 Runnable 3586 5096 FileObserver
30 1095 Wait 15 184 CpuTracker
31 1100 Runnable 0 0 Thread-3
32 1101 Runnable 27 175 Thread-4
33 1099 Runnable 0 0 Thread-5
34 1104 Runnable 3509 5769 PowerManagerService
35 1119 Runnable 0 0 BatteryStats_wakeupReason
36 1137 Runnable 0 0 PackageManager
37 1146 Runnable 10 26 PackageManager
38 1150 Runnable 5344 6359 Binder:969_4
39 2794 Runnable 6244 7399 Binder:969_A
40 1635 Runnable 4 3 PackageInstaller
41 3044 Runnable 4632 5501 Binder:969_B
42 1744 Runnable 0 0 SensorService
43 1743 Runnable 0 0 SensorEventAckReceiver
44 1755 Runnable 0 0 HealthServiceHwbinder
45 1759 Runnable 0 0 RollbackPackageHealthObserver
46 1760 Runnable 0 0 RollbackManagerServiceHandler
47 3067 Wait 8 36 LazyTaskWriterThread
48 3103 Wait 64 38 pool-6-thread-1
49 1763 Runnable 0 0 AccountManagerService
50 1766 Runnable 3 15 SettingsProvider
51 1770 Runnable 6 2475 CachedAppOptimizerThread
52 1771 Runnable 89 279 AlarmManager
53 1774 Runnable 5251 6078 Binder:969_5
54 3090 Runnable 6 13 backup-0
55 1778 Runnable 11 54 InputReader
56 1777 Runnable 45 122 InputDispatcher
57 1775 Runnable 14 134 UEventObserver
58 1782 Runnable 0 4 NetworkWatchlistService
59 1783 Runnable 627 1560 HwBinder:969_2
60 1784 Runnable 0 0 hidl_ssvc_poll
61 1785 Runnable 416 1089 HwBinder:969_3
62 1787 Runnable 617 1019 EventHandlerThread
63 1788 Runnable 6 0 AppIntegrityManagerServiceHandler
64 1793 Runnable 0 2 StorageManagerService
65 3372 Runnable 7685 8960 Binder:969_C
66 1798 Runnable 0 0 LockSettingsService
67 3454 Runnable 5625 6455 Binder:969_D
68 1805 Runnable 78 285 NetworkStats
69 1806 Runnable 24 69 NetworkPolicy
70 1807 Runnable 53 212 NetworkPolicy.uid
71 1809 Runnable 0 0 AsyncChannelHandlerThread
72 1810 Runnable 3306 8920 WifiHandlerThread
73 1813 Runnable 4 1 WifiP2pService
74 1814 Runnable 4 0 PasspointProvisionerHandlerThread
75 1823 Runnable 154 60 WifiScanningService
76 1825 Runnable 590 454 ConnectivityServiceThread
77 1826 Runnable 0 0 android.pacmanager
78 1827 Runnable 0 0 NsdService
79 1828 Runnable 0 0 mDnsConnector
80 1830 Runnable 1 0 ranker
81 1831 Runnable 0 5 notification-sqlite-log
82 1832 Runnable 0 2 ConditionProviders.ECP
83 1834 Runnable 24 142 DeviceStorageMonitorService
84 1836 Runnable 5 7 AS.SfxWorker
85 1838 Runnable 0 3 AudioService
86 1840 Runnable 0 0 AudioDeviceBroker
87 1851 Wait 0 0 Thread-8
88 1857 Runnable 68 26 ConnectivityThread
89 2573 Runnable 4689 5607 Binder:969_9
90 1858 Runnable 5 3 backup
91 1860 Runnable 0 2 GraphicsStats-disk
92 1862 Runnable 0 0 BlobStore
93 1864 Runnable 0 0 SessionRecordThread
94 1865 Runnable 0 0 SliceManagerService
95 1866 Runnable 0 0 CameraService_proxy
96 1867 Runnable 0 0 StatsCompanionService
97 1872 Runnable 1 1 wifiRttService
98 1873 Runnable 23 25 wifiAwareService
99 1875 Runnable 48 27 EthernetServiceThread
100 1876 Runnable 42 20 WifiManagerThread
101 1880 Wait 78 148 TaskSnapshotPersister
102 1886 Wait 0 0 PhotonicModulator
103 1887 Runnable 0 0 HealthServiceHwbinder
104 1906 Runnable 0 0 SyncManager
105 1931 Runnable 0 0 UsbService host thread
106 3526 Wait 0 0 Timer-0
107 2758 Runnable 0 0 AdbDebuggingManager
108 2756 Runnable 0 0 RedirectListenerHandler
109 3528 Wait 1 0 pool-4-thread-1
110 1946 Runnable 88 305 Thread-10
111 1948 Runnable 6 34 SyncHandler-0
112 1947 Wait 5 14 AsyncTask #1
113 1953 Runnable 0 4 NetworkStatsObservers
114 2019 Runnable 457 1187 HwBinder:969_4
115 2029 Runnable 0 0 EmergencyAffordanceService
116 2070 Runnable 11 8 SunmiNetworkTimeUpdateService
117 2054 Runnable 728 1950 HwBinder:969_5
118 2124 Runnable 4551 5443 Binder:969_6
119 2160 Runnable 5438 6567 Binder:969_7
120 2184 Runnable 5567 6687 Binder:969_8
121 2491 Runnable 0 6 SyncHandler-1
122 2291 Runnable 0 0 BluetoothRouteManager
123 2292 Runnable 0 0 AudioPortEventHandler
124 2299 Runnable 0 0 com.android.server.telecom.CallAudioRouteStateMachine
125 2301 Runnable 0 0 CallAudioModeStateMachine
126 2308 Runnable 0 0 ConnectionSvrFocusMgr
127 2476 Runnable 0 0 queued-work-looper
128 3530 Wait 0 1 pool-4-thread-3
129 3541 Wait 0 1 pool-4-thread-8
130 3529 Wait 2 0 pool-4-thread-2
131 3532 Wait 0 1 pool-4-thread-5
132 3531 Wait 1 0 pool-4-thread-4
133 3533 Wait 0 1 pool-4-thread-6
134 3540 Wait 0 2 pool-4-thread-7
135 3549 Wait 0 1 pool-4-thread-9
136 3552 Wait 0 2 pool-4-thread-10
137 3893 Runnable 6624 7837 Binder:969_E
138 5506 Runnable 0 2 AudioTrack
139 4063 Runnable 0 1 AsyncQueryWorker
*140 4364 Runnable 61 125 RenderThread
141 4227 Runnable 8276 9516 Binder:969_F
142 29433 Runnable 16 23 Binder:969_15
143 5978 Runnable 7466 8805 Binder:969_10
144 8795 Runnable 0 0 AudioTrack
145 11994 Runnable 7421 8887 Binder:969_11
146 13411 Runnable 2314 2848 Binder:969_12
147 13413 Runnable 4434 5370 Binder:969_13
148 13435 Runnable 4814 5648 Binder:969_14
149 20887 Runnable 8 22 SyncHandler-2
151 30294 Runnable 2920 3406 Binder:969_16
UML
主线程
public final class SystemServer {
/**
* The main entry point from zygote.
*/
public static void main(String[] args) {
new SystemServer().run();
}
private void run() {
Looper.prepareMainLooper();
// Loop forever.
Looper.loop();
throw new RuntimeException("Main thread loop unexpectedly exited");
}
}
ServiceThread
线程基类
public class ServiceThread extends HandlerThread {
private static final String TAG = "ServiceThread";
private final boolean mAllowIo;
public ServiceThread(String name, int priority, boolean allowIo) {
super(name, priority);
mAllowIo = allowIo;
}
@Override
public void run() {
Process.setCanSelfBackground(false);
if (!mAllowIo) {
StrictMode.initThreadDefaults(null);
}
super.run();
}
}
android.fg
系统共享的后台线程，用于执行一些比较耗时的操作，例如磁盘读写
/**
* 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 ServiceThread {
private static final long SLOW_DISPATCH_THRESHOLD_MS = 100;
private static final long SLOW_DELIVERY_THRESHOLD_MS = 200;
private static FgThread sInstance;
private static Handler sHandler;
private static HandlerExecutor sHandlerExecutor;
private FgThread() {
super("android.fg", android.os.Process.THREAD_PRIORITY_DEFAULT, true /*allowIo*/);
}
private static void ensureThreadLocked() {
if (sInstance == null) {
sInstance = new FgThread();
sInstance.start();
final Looper looper = sInstance.getLooper();
looper.setTraceTag(Trace.TRACE_TAG_SYSTEM_SERVER);
looper.setSlowLogThresholdMs(
SLOW_DISPATCH_THRESHOLD_MS, SLOW_DELIVERY_THRESHOLD_MS);
sHandler = new Handler(sInstance.getLooper());
sHandlerExecutor = new HandlerExecutor(sHandler);
}
}
public static FgThread get() {
synchronized (FgThread.class) {
ensureThreadLocked();
return sInstance;
}
}
public static Handler getHandler() {
synchronized (FgThread.class) {
ensureThreadLocked();
return sHandler;
}
}
public static Executor getExecutor() {
synchronized (FgThread.class) {
ensureThreadLocked();
return sHandlerExecutor;
}
}
}
android.ui
UI线程
/**
* Shared singleton thread for showing UI. This is a foreground thread, and in
* additional should not have operations that can take more than a few ms scheduled
* on it to avoid UI jank.
*/
public final class UiThread extends ServiceThread {
private UiThread() {
super("android.ui", Process.THREAD_PRIORITY_FOREGROUND, false /*allowIo*/);
}
android.io
IO线程
/**
* Shared singleton I/O thread for the system. This is a thread for non-background
* service operations that can potential block briefly on network IO operations
* (not waiting for data itself, but communicating with network daemons).
*/
public final class IoThread extends ServiceThread {
private IoThread() {
super("android.io", android.os.Process.THREAD_PRIORITY_DEFAULT, true /*allowIo*/);
}
}
android.display
/**
* 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 DisplayThread() {
// DisplayThread runs important stuff, but these are not as important as things running in
// AnimationThread. Thus, set the priority to one lower.
super("android.display", Process.THREAD_PRIORITY_DISPLAY + 1, false /*allowIo*/);
}
}
android.anim
/**
* Thread for handling all legacy window animations, or anything that's directly impacting
* animations like starting windows or traversals.
*/
public final class AnimationThread extends ServiceThread {
private AnimationThread() {
super("android.anim", THREAD_PRIORITY_DISPLAY, false /*allowIo*/);
}
}
android.bg
package com.android.internal.os;
/**
* Shared singleton background thread for each process.
*/
public final class BackgroundThread extends HandlerThread {
private BackgroundThread() {
super("android.bg", android.os.Process.THREAD_PRIORITY_BACKGROUND);
}
}
Binder线程
1 27841 Runnable 30 28 main
2 12870 Runnable 0 0 Binder:27841_4
*6 27856 Wait 0 0 Signal Catcher
*7 27857 Runnable 0 0
*8 27858 Runnable 0 3 ADB-JDWP Connection Control Thread
*9 27859 Runnable 3 3 Jit thread pool worker thread 0
*10 27860 Wait 0 2 HeapTaskDaemon
*11 27861 Wait 0 0 ReferenceQueueDaemon
*12 27862 Wait 0 0 FinalizerDaemon
*13 27863 Wait 0 0 FinalizerWatchdogDaemon
14 27864 Runnable 0 0 Binder:27841_1 //Binder主线程
15 27865 Runnable 0 0 Binder:27841_2
16 27867 Runnable 0 0 Binder:27841_3
*17 27870 Runnable 1 0 Profile Saver
*18 27872 Runnable 21 19 RenderThread
19 28086 Runnable 0 0 Thread-2
20 28073 Runnable 77130 10908 Thread-3
*21 28119 Runnable 184 82 Thread-4
*22 28121 Runnable 20 105 Thread-5
23 28153 TimedWait 555 611 Studio:InputCon
- Binder主线程：进程创建过程会调用startThreadPool()过程中再进入spawnPooledThread(true)，来创建Binder主线程。编号从1开始，也就是意味着binder主线程名为binder_1，并且主线程是不会退出的
- Binder普通线程：是由Binder Driver来根据是否有空闲的binder线程来决定是否创建binder线程，回调spawnPooledThread(false) ，isMain=false，该线程名格式为binder_x
- Binder其他线程：其他线程是指并没有调用spawnPooledThread方法，而是直接调用IPC.joinThreadPool()，将当前线程直接加入binder线程队列。例如： mediaserver和servicemanager的主线程都是binder线程，但system_server的主线程并非binder线程
