绗旇锛歓ygote鍜孲ystemServer杩涚▼鍚姩杩囩▼
Zygote鐨勫惎鍔?/h1>
瀹冧互鏈嶅姟鐨勫舰寮忚鍚姩銆?/p>
/* start the virtual machine. */startVM(&mJavaVM, &env);/* Register android functions. */startReg(env);
鎺ヤ笅鏉ユ墽琛屸€渃om.android.internal.os.ZygoteInit鈥滼ava绫荤殑main鏂规硶缁х画鎵ц鍚姩銆?/p>
ZygoteInit.main
package com.android.internal.os;import android.net.LocalServerSocket;...public class ZygoteInit { private static LocalServerSocket sServerSocket; public static void main(String argv[]) { ... registerZygoteSocket(); ... if (argv[1].equals("true")) { startSystemServer(); } else if (!argv[1].equals("false")) { throw new RuntimeException(argv[0] + USAGE_STRING); } ... if (ZYGOTE_FORK_MODE) { runForkMode(); } else { runSelectLoopMode(); } ... closeServerSocket(); ... }}鍒涘缓Socket
Zygote璋冪敤registerZygoteSocket();鍒涘缓涓€涓?code>LocalServerSocket sServerSocket鐨凷erver绔疭ocket锛岀瓑寰呬互鍚庤繍琛屽湪System杩涚▼涓殑鏈嶅姟ActivityManagerService鍒涘缓鐨凜lient绔疭ocket杩炴帴锛岀劧鍚庨€氳繃Socket杩涚▼闂撮€氫俊閫氱煡Zygote鍒涘缓鏂扮殑搴旂敤绋嬪簭杩涚▼銆?/p>
鍒涘缓System杩涚▼
/** * Prepare the arguments and fork for the system server process. */private static boolean startSystemServer() throws MethodAndArgsCaller, RuntimeException { /* Hardcoded command line to start the system server */ String args[] = new String[] { "--setuid=1000", "--setgid=1000", "--setgroups=1001,1002,1003,1004,1005,1006,1007,1008,1009,1010,1018,3001,3002,3003,3006", "--capabilities=130104352,130104352", "--rlimit=8,", "--runtime-init", "--nice-name=system_server", "com.android.server.SystemServer", }; ... ZygoteConnection.Arguments parsedArgs = null; int pid; try { parsedArgs = new ZygoteConnection.Arguments(args); /* Request to fork the system server process */ pid = Zygote.forkSystemServer( parsedArgs.uid, parsedArgs.gid, parsedArgs.gids, debugFlags, rlimits, parsedArgs.permittedCapabilities, parsedArgs.effectiveCapabilities); } catch (IllegalArgumentException ex) { throw new RuntimeException(ex); } /* For child process */ if (pid == 0) { handleSystemServerProcess(parsedArgs); } return true;}鍙橀噺args淇濆瓨鍚姩System杩涚▼鐨勫弬鏁般€?br> Zygote.forkSystemServer()澶嶅埗褰撳墠杩涚▼鏉ュ垱寤哄瓙杩涚▼銆?br> handleSystemServerProcess()缁х画澶勭悊System杩涚▼鐨勫惎鍔ㄣ€?/p>
杞绛夊緟AMS璇锋眰鍒涘缓App杩涚▼
private static void runSelectLoopMode() throws MethodAndArgsCaller { ArrayList fds = new ArrayList(); ArrayList peers = new ArrayList(); FileDescriptor[] fdArray = new FileDescriptor[4]; fds.add(sServerSocket.getFileDescriptor()); peers.add(null); while (true) { ... try { fdArray = fds.toArray(fdArray); index = selectReadable(fdArray); } catch (IOException ex) { throw new RuntimeException("Error in select()", ex); } if (index < 0) { throw new RuntimeException("Error in select()"); } else if (index == 0) { ZygoteConnection newPeer = acceptCommandPeer(); peers.add(newPeer); fds.add(newPeer.getFileDesciptor()); } else { boolean done; done = peers.get(index).runOnce(); if (done) { peers.remove(index); fds.remove(index); } } }}/** * Waits for and accepts a single command connection. Throws * RuntimeException on failure. */private static ZygoteConnection acceptCommandPeer() { try { return new ZygoteConnection(sServerSocket.accept()); } catch (IOException ex) { throw new RuntimeException( "IOException during accept()", ex); }} 鏃犻檺寰幆锛岀瓑寰呮潵鑷狝MS鍒涘缓鐨凷ocket杩炴帴銆?br> sServerSocket鍦╢ds[0]浣嶇疆銆?br> 姣忓綋accept()杩斿洖涓€涓繛鎺ュ悗锛屽皢瀵瑰簲姝よ繛鎺ョ殑newPeer.getFileDesciptor()濂楁帴瀛楁弿杩版坊鍔犲埌fds锛堢0浣嶇疆鍚庯級锛屼笅涓€娆¤鍙栧埌鏁版嵁鏃讹紝鑻ュ湪fds[0]浠ュ悗鐨勶紝璇存槑鏄墠闈㈢殑newPeer杩炴帴鏀跺埌鐨凙MS鐨勫垱寤烘柊搴旂敤绋嬪簭杩涚▼鐨勮姹傘€?br> runOnce()鐢ㄦ潵澶勭悊AMS鍒涘缓鏂板簲鐢ㄧ▼搴忚繘绋嬬殑璇锋眰銆?/p>
ZygoteInit.handleSystemServerProcess() private static void handleSystemServerProcess( ZygoteConnection.Arguments parsedArgs) throws ZygoteInit.MethodAndArgsCaller { closeServerSocket(); /* * Pass the remaining arguments to SystemServer. * "--nice-name=system_server com.android.server.SystemServer" */ RuntimeInit.zygoteInit(parsedArgs.remainingArgs); /* should never reach here */}
private static void handleSystemServerProcess( ZygoteConnection.Arguments parsedArgs) throws ZygoteInit.MethodAndArgsCaller { closeServerSocket(); /* * Pass the remaining arguments to SystemServer. * "--nice-name=system_server com.android.server.SystemServer" */ RuntimeInit.zygoteInit(parsedArgs.remainingArgs); /* should never reach here */}Zygote澶嶅埗鑷韩鍒涘缓鐨勫瓙杩涚▼鍋氫负System杩涚▼锛岃繖鏍峰畠寰楀埌浜哯ygote鐨凷erver Socket锛屼絾鏄敤涓嶅埌锛屾墍浠ョ涓€鍙?code>closeServerSocket()鍏抽棴姝ゅ鎺ュ瓧銆?/p>
RuntimeInit.zygoteInit
package com.android.internal.os;public class RuntimeInit { public static final void zygoteInit(String[] argv) throws ZygoteInit.MethodAndArgsCaller { ... commonInit(); zygoteInitNative(); ... // Remaining arguments are passed to the start class's static main String startClass = argv[curArg++]; String[] startArgs = new String[argv.length - curArg]; System.arraycopy(argv, curArg, startArgs, 0, startArgs.length); invokeStaticMain(startClass, startArgs); } }zygoteInitNative()鍦⊿ystem杩涚▼涓惎鍔ㄤ竴涓狟inder绾跨▼姹犮€?br> RuntimeInit.invokeStaticMain()闈欐€佹柟娉曡皟鐢?code>"com.android.server.SystemServer"鐨刴ain鏂规硶銆?/p>
SystemServer.main
浼犻€掕皟鐢╪ative鏂规硶init1()锛?/p>
class SystemServer { /** * This method is called from Zygote to initialize the system. This will cause the native * services (SurfaceFlinger, AudioFlinger, etc..) to be started. After that it will call back * up into init2() to start the Android services. */ native public static void init1(String[] args);}init1()鐨勫伐浣滐細
娉ㄥ唽Service Manager鐨勬浜￠€氱煡锛氳皟鐢╞inderDied()銆係ystem杩涚▼鎵цkill缁撴潫鑷繁銆?/p>
鍒涘缓SurfaceFlinger銆佸拰SensorService涓や釜鏈嶅姟銆?/p>
杩斿洖SystemServer.init2()缁х画鍚姩java璇█寮€鍙戠殑绯荤粺鏈嶅姟銆?/p>
SystemServer.init2
public static final void init2() { Thread thr = new ServerThread(); thr.setName("android.server.ServerThread"); thr.start();}ServerThread缁ф壙鑷猅hread銆?/p>
ServerThread.run
class ServerThread extends Thread { @Override public void run() { Looper.prepare(); ... // Critical services... try { ... Slog.i(TAG, "Activity Manager"); context = ActivityManagerService.main(factoryTest); ... Slog.i(TAG, "Package Manager"); pm = PackageManagerService.main(context, factoryTest != SystemServer.FACTORY_TEST_OFF); ... Slog.i(TAG, "Content Manager"); ContentService.main(context, factoryTest == SystemServer.FACTORY_TEST_LOW_LEVEL); ... Slog.i(TAG, "Window Manager"); wm = WindowManagerService.main(context, power, factoryTest != SystemServer.FACTORY_TEST_LOW_LEVEL); ServiceManager.addService(Context.WINDOW_SERVICE, wm); ... ((ActivityManagerService)ServiceManager.getService("activity")) .setWindowManager(wm); ... } catch (RuntimeException e) { Slog.e("System", "Failure starting core service", e); } ... Looper.loop(); Slog.d(TAG, "System ServerThread is exiting!"); }}鍚姩鍚勪釜Service鐒跺悗娉ㄥ唽鍒癝erviceManager銆?br> 鍚勪釜鏈嶅姟閮戒娇鐢˙inder鍜屽叾瀹冩湇鍔′娇鐢ㄨ€呰繘绋嬭繘琛屽氨琛屼氦浜掋€?/p>
锛堟湰鏂囦娇鐢ˋtom缂栧啓锛?/p>
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