am 402120a2: Merge "Wait for secondary zygote before bringing up the system_server." (be3dc575) · Commits · e / os / android_frameworks_base

core/java/android/os/Process.java

+61 −94

Original line number	Diff line number	Diff line
		@@ -31,13 +31,17 @@ import java.util.Arrays;
		import java.util.List;

		/package/ class ZygoteStartFailedEx extends Exception {
		/**
		* Something prevented the zygote process startup from happening normally
		*/
		ZygoteStartFailedEx(String s) {
		super(s);
		}

		ZygoteStartFailedEx() {};
		ZygoteStartFailedEx(String s) {super(s);}
		ZygoteStartFailedEx(Throwable cause) {super(cause);}
		ZygoteStartFailedEx(Throwable cause) {
		super(cause);
		}

		ZygoteStartFailedEx(String s, Throwable cause) {
		super(s, cause);
		}
		}

		/**
		@@ -46,9 +50,15 @@ import java.util.List;
		public class Process {
		private static final String LOG_TAG = "Process";

		private static final String ZYGOTE_SOCKET = "zygote";
		/**
		* @hide for internal use only.
		*/
		public static final String ZYGOTE_SOCKET = "zygote";

		private static final String SECONDARY_ZYGOTE_SOCKET = "zygote_secondary";
		/**
		* @hide for internal use only.
		*/
		public static final String SECONDARY_ZYGOTE_SOCKET = "zygote_secondary";

		/**
		* Defines the UID/GID under which system code runs.
		@@ -338,8 +348,10 @@ public class Process {

		/**
		* State for communicating with the zygote process.
		*
		* @hide for internal use only.
		*/
		static class ZygoteState {
		public static class ZygoteState {
		final LocalSocket socket;
		final DataInputStream inputStream;
		final BufferedWriter writer;
		@@ -355,32 +367,12 @@ public class Process {
		this.abiList = abiList;
		}

		static ZygoteState connect(String socketAddress, int tries) throws ZygoteStartFailedEx {
		LocalSocket zygoteSocket = null;
		public static ZygoteState connect(String socketAddress) throws IOException {
		DataInputStream zygoteInputStream = null;
		BufferedWriter zygoteWriter = null;

		/*
		* See bug #811181: Sometimes runtime can make it up before zygote.
		* Really, we'd like to do something better to avoid this condition,
		* but for now just wait a bit...
		*
		* TODO: This bug was filed in 2007. Get rid of this code. The zygote
		* forks the system_server so it shouldn't be possible for the zygote
		* socket to be brought up after the system_server is.
		*/
		for (int i = 0; i < tries; i++) {
		if (i > 0) {
		try {
		Log.i(LOG_TAG, "Zygote not up yet, sleeping...");
		Thread.sleep(ZYGOTE_RETRY_MILLIS);
		} catch (InterruptedException ex) {
		throw new ZygoteStartFailedEx(ex);
		}
		}
		final LocalSocket zygoteSocket = new LocalSocket();

		try {
		zygoteSocket = new LocalSocket();
		zygoteSocket.connect(new LocalSocketAddress(socketAddress,
		LocalSocketAddress.Namespace.RESERVED));

		@@ -388,22 +380,13 @@ public class Process {

		zygoteWriter = new BufferedWriter(new OutputStreamWriter(
		zygoteSocket.getOutputStream()), 256);
		break;
		} catch (IOException ex) {
		if (zygoteSocket != null) {
		try {
		zygoteSocket.close();
		} catch (IOException ex2) {
		Log.e(LOG_TAG,"I/O exception on close after exception", ex2);
		}
		} catch (IOException ignore) {
		}

		zygoteSocket = null;
		}
		}

		if (zygoteSocket == null) {
		throw new ZygoteStartFailedEx("connect failed");
		throw ex;
		}

		String abiListString = getAbiList(zygoteWriter, zygoteInputStream);
		@@ -417,7 +400,7 @@ public class Process {
		return abiList.contains(abi);
		}

		void close() {
		public void close() {
		try {
		socket.close();
		} catch (IOException ex) {
		@@ -503,9 +486,7 @@ public class Process {
		* @throws ZygoteStartFailedEx if the query failed.
		*/
		private static String getAbiList(BufferedWriter writer, DataInputStream inputStream)
		throws ZygoteStartFailedEx {
		try {

		throws IOException {
		// Each query starts with the argument count (1 in this case)
		writer.write("1");
		// ... followed by a new-line.
		@@ -521,9 +502,6 @@ public class Process {
		inputStream.readFully(bytes);

		return new String(bytes, StandardCharsets.US_ASCII);
		} catch (IOException ioe) {
		throw new ZygoteStartFailedEx(ioe);
		}
		}

		/**
		@@ -676,31 +654,17 @@ public class Process {
		}
		}

		/**
		* Returns the number of times we attempt a connection to the zygote. We
		* sleep for {@link #ZYGOTE_RETRY_MILLIS} milliseconds between each try.
		*
		* This could probably be removed, see TODO in {@code ZygoteState#connect}.
		*/
		private static int getNumTries(ZygoteState state) {
		// Retry 10 times for the first connection to each zygote.
		if (state == null) {
		return 11;
		}

		// This means the connection has already been established, but subsequently
		// closed, possibly due to an IOException. We retry just once if that's the
		// case.
		return 1;
		}

		/**
		* Tries to open socket to Zygote process if not already open. If
		* already open, does nothing. May block and retry.
		*/
		private static ZygoteState openZygoteSocketIfNeeded(String abi) throws ZygoteStartFailedEx {
		if (primaryZygoteState == null \|\| primaryZygoteState.isClosed()) {
		primaryZygoteState = ZygoteState.connect(ZYGOTE_SOCKET, getNumTries(primaryZygoteState));
		try {
		primaryZygoteState = ZygoteState.connect(ZYGOTE_SOCKET);
		} catch (IOException ioe) {
		throw new ZygoteStartFailedEx("Error connecting to primary zygote", ioe);
		}
		}

		if (primaryZygoteState.matches(abi)) {
		@@ -709,8 +673,11 @@ public class Process {

		// The primary zygote didn't match. Try the secondary.
		if (secondaryZygoteState == null \|\| secondaryZygoteState.isClosed()) {
		secondaryZygoteState = ZygoteState.connect(SECONDARY_ZYGOTE_SOCKET,
		getNumTries(secondaryZygoteState));
		try {
		secondaryZygoteState = ZygoteState.connect(SECONDARY_ZYGOTE_SOCKET);
		} catch (IOException ioe) {
		throw new ZygoteStartFailedEx("Error connecting to secondary zygote", ioe);
		}
		}

		if (secondaryZygoteState.matches(abi)) {

core/java/com/android/internal/os/ZygoteInit.java

+37 −2

Original line number	Diff line number	Diff line
		@@ -23,6 +23,7 @@ import android.content.res.Resources;
		import android.content.res.TypedArray;
		import android.net.LocalServerSocket;
		import android.opengl.EGL14;
		import android.os.Build;
		import android.os.Debug;
		import android.os.Process;
		import android.os.SystemClock;
		@@ -505,7 +506,7 @@ public class ZygoteInit {
		/**
		* Prepare the arguments and fork for the system server process.
		*/
		private static boolean startSystemServer()
		private static boolean startSystemServer(String abiList, String socketName)
		throws MethodAndArgsCaller, RuntimeException {
		long capabilities = posixCapabilitiesAsBits(
		OsConstants.CAP_BLOCK_SUSPEND,
		@@ -553,6 +554,10 @@ public class ZygoteInit {

		/* For child process */
		if (pid == 0) {
		if (hasSecondZygote(abiList)) {
		waitForSecondaryZygote(socketName);
		}

		handleSystemServerProcess(parsedArgs);
		}

		@@ -615,7 +620,7 @@ public class ZygoteInit {
		Trace.setTracingEnabled(false);

		if (startSystemServer) {
		startSystemServer();
		startSystemServer(abiList, socketName);
		}

		Log.i(TAG, "Accepting command socket connections");
		@@ -631,6 +636,36 @@ public class ZygoteInit {
		}
		}

		/**
		* Return {@code true} if this device configuration has another zygote.
		*
		* We determine this by comparing the device ABI list with this zygotes
		* list. If this zygote supports all ABIs this device supports, there won't
		* be another zygote.
		*/
		private static boolean hasSecondZygote(String abiList) {
		return !SystemProperties.get("ro.product.cpu.abilist").equals(abiList);
		}

		private static void waitForSecondaryZygote(String socketName) {
		String otherZygoteName = Process.ZYGOTE_SOCKET.equals(socketName) ?
		Process.SECONDARY_ZYGOTE_SOCKET : Process.ZYGOTE_SOCKET;
		while (true) {
		try {
		final Process.ZygoteState zs = Process.ZygoteState.connect(otherZygoteName);
		zs.close();
		break;
		} catch (IOException ioe) {
		Log.w(TAG, "Got error connecting to zygote, retrying. msg= " + ioe.getMessage());
		}

		try {
		Thread.sleep(1000);
		} catch (InterruptedException ie) {
		}
		}
		}

		/**
		* Runs the zygote process's select loop. Accepts new connections as
		* they happen, and reads commands from connections one spawn-request's