Merge changes I881f63b8,I4c5edd2d,I8ff0d29c,I6578c3a4,Iea286ab0, ... (2ce034f7) · Commits · e / devices / smdk4412 / android_frameworks_native

libs/binder/RpcAddress.cpp

+24 −3

Original line number	Original line	Diff line number	Diff line
	@@ -29,7 +29,7 @@ RpcAddress RpcAddress::zero() {
	}		}

	bool RpcAddress::isZero() const {		bool RpcAddress::isZero() const {
	RpcWireAddress ZERO{0};		RpcWireAddress ZERO{.options = 0};
	return memcmp(mRawAddr.get(), &ZERO, sizeof(RpcWireAddress)) == 0;		return memcmp(mRawAddr.get(), &ZERO, sizeof(RpcWireAddress)) == 0;
	}		}

	@@ -51,13 +51,34 @@ static void ReadRandomBytes(uint8_t* buf, size_t len) {
	close(fd);		close(fd);
	}		}

	RpcAddress RpcAddress::unique() {		RpcAddress RpcAddress::random(bool forServer) {
			// The remainder of this header acts as reserved space for different kinds
			// of binder objects.
			uint64_t options = RPC_WIRE_ADDRESS_OPTION_CREATED;

			// servers and clients allocate addresses independently, so this bit can
			// tell you where an address originates
			if (forServer) options \|= RPC_WIRE_ADDRESS_OPTION_FOR_SERVER;

	RpcAddress ret;		RpcAddress ret;
	ReadRandomBytes((uint8_t*)ret.mRawAddr.get(), sizeof(RpcWireAddress));		RpcWireAddress* raw = ret.mRawAddr.get();

			raw->options = options;
			ReadRandomBytes(raw->address, sizeof(raw->address));

	LOG_RPC_DETAIL("Creating new address: %s", ret.toString().c_str());		LOG_RPC_DETAIL("Creating new address: %s", ret.toString().c_str());
	return ret;		return ret;
	}		}

			bool RpcAddress::isForServer() const {
			return mRawAddr.get()->options & RPC_WIRE_ADDRESS_OPTION_FOR_SERVER;
			}

			bool RpcAddress::isRecognizedType() const {
			uint64_t allKnownOptions = RPC_WIRE_ADDRESS_OPTION_CREATED \| RPC_WIRE_ADDRESS_OPTION_FOR_SERVER;
			return (mRawAddr.get()->options & ~allKnownOptions) == 0;
			}

	RpcAddress RpcAddress::fromRawEmbedded(const RpcWireAddress* raw) {		RpcAddress RpcAddress::fromRawEmbedded(const RpcWireAddress* raw) {
	RpcAddress addr;		RpcAddress addr;
	memcpy(addr.mRawAddr.get(), raw, sizeof(RpcWireAddress));		memcpy(addr.mRawAddr.get(), raw, sizeof(RpcWireAddress));

libs/binder/RpcServer.cpp

+27 −13

Original line number	Original line	Diff line number	Diff line
	@@ -270,14 +270,25 @@ void RpcServer::establishConnection(sp<RpcServer>&& server, base::unique_fd clie
	return;		return;
	}		}

	if (header.sessionId == RPC_SESSION_ID_NEW) {		RpcAddress sessionId = RpcAddress::fromRawEmbedded(&header.sessionId);

			if (sessionId.isZero()) {
	if (reverse) {		if (reverse) {
	ALOGE("Cannot create a new session with a reverse connection, would leak");		ALOGE("Cannot create a new session with a reverse connection, would leak");
	return;		return;
	}		}

	LOG_ALWAYS_FATAL_IF(server->mSessionIdCounter >= INT32_MAX, "Out of session IDs");		RpcAddress sessionId = RpcAddress::zero();
	server->mSessionIdCounter++;		size_t tries = 0;
			do {
			// don't block if there is some entropy issue
			if (tries++ > 5) {
			ALOGE("Cannot find new address: %s", sessionId.toString().c_str());
			return;
			}

			sessionId = RpcAddress::random(true /forServer/);
			} while (server->mSessions.end() != server->mSessions.find(sessionId));

	session = RpcSession::make();		session = RpcSession::make();
	session->setMaxThreads(server->mMaxThreads);		session->setMaxThreads(server->mMaxThreads);
	@@ -285,23 +296,24 @@ void RpcServer::establishConnection(sp<RpcServer>&& server, base::unique_fd clie
	sp<RpcServer::EventListener>::fromExisting(		sp<RpcServer::EventListener>::fromExisting(
	static_cast<RpcServer::EventListener*>(		static_cast<RpcServer::EventListener*>(
	server.get())),		server.get())),
	server->mSessionIdCounter)) {		sessionId)) {
	ALOGE("Failed to attach server to session");		ALOGE("Failed to attach server to session");
	return;		return;
	}		}

	server->mSessions[server->mSessionIdCounter] = session;		server->mSessions[sessionId] = session;
	} else {		} else {
	auto it = server->mSessions.find(header.sessionId);		auto it = server->mSessions.find(sessionId);
	if (it == server->mSessions.end()) {		if (it == server->mSessions.end()) {
	ALOGE("Cannot add thread, no record of session with ID %d", header.sessionId);		ALOGE("Cannot add thread, no record of session with ID %s",
			sessionId.toString().c_str());
	return;		return;
	}		}
	session = it->second;		session = it->second;
	}		}

	if (reverse) {		if (reverse) {
	LOG_ALWAYS_FATAL_IF(!session->addClientConnection(std::move(clientFd)),		LOG_ALWAYS_FATAL_IF(!session->addOutgoingConnection(std::move(clientFd), true),
	"server state must already be initialized");		"server state must already be initialized");
	return;		return;
	}		}
	@@ -350,19 +362,21 @@ bool RpcServer::setupSocketServer(const RpcSocketAddress& addr) {
	return true;		return true;
	}		}

	void RpcServer::onSessionLockedAllServerThreadsEnded(const sp<RpcSession>& session) {		void RpcServer::onSessionLockedAllIncomingThreadsEnded(const sp<RpcSession>& session) {
	auto id = session->mId;		auto id = session->mId;
	LOG_ALWAYS_FATAL_IF(id == std::nullopt, "Server sessions must be initialized with ID");		LOG_ALWAYS_FATAL_IF(id == std::nullopt, "Server sessions must be initialized with ID");
	LOG_RPC_DETAIL("Dropping session %d", *id);		LOG_RPC_DETAIL("Dropping session with address %s", id->toString().c_str());

	std::lock_guard<std::mutex> _l(mLock);		std::lock_guard<std::mutex> _l(mLock);
	auto it = mSessions.find(*id);		auto it = mSessions.find(*id);
	LOG_ALWAYS_FATAL_IF(it == mSessions.end(), "Bad state, unknown session id %d", *id);		LOG_ALWAYS_FATAL_IF(it == mSessions.end(), "Bad state, unknown session id %s",
	LOG_ALWAYS_FATAL_IF(it->second != session, "Bad state, session has id mismatch %d", *id);		id->toString().c_str());
			LOG_ALWAYS_FATAL_IF(it->second != session, "Bad state, session has id mismatch %s",
			id->toString().c_str());
	(void)mSessions.erase(it);		(void)mSessions.erase(it);
	}		}

	void RpcServer::onSessionServerThreadEnded() {		void RpcServer::onSessionIncomingThreadEnded() {
	mShutdownCv.notify_all();		mShutdownCv.notify_all();
	}		}

libs/binder/RpcSession.cpp

+78 −57

Original line number	Original line	Diff line number	Diff line
	@@ -51,7 +51,7 @@ RpcSession::~RpcSession() {
	LOG_RPC_DETAIL("RpcSession destroyed %p", this);		LOG_RPC_DETAIL("RpcSession destroyed %p", this);

	std::lock_guard<std::mutex> _l(mMutex);		std::lock_guard<std::mutex> _l(mMutex);
	LOG_ALWAYS_FATAL_IF(mServerConnections.size() != 0,		LOG_ALWAYS_FATAL_IF(mIncomingConnections.size() != 0,
	"Should not be able to destroy a session with servers in use.");		"Should not be able to destroy a session with servers in use.");
	}		}

	@@ -61,10 +61,10 @@ sp<RpcSession> RpcSession::make() {

	void RpcSession::setMaxThreads(size_t threads) {		void RpcSession::setMaxThreads(size_t threads) {
	std::lock_guard<std::mutex> _l(mMutex);		std::lock_guard<std::mutex> _l(mMutex);
	LOG_ALWAYS_FATAL_IF(!mClientConnections.empty() \|\| !mServerConnections.empty(),		LOG_ALWAYS_FATAL_IF(!mOutgoingConnections.empty() \|\| !mIncomingConnections.empty(),
	"Must set max threads before setting up connections, but has %zu client(s) "		"Must set max threads before setting up connections, but has %zu client(s) "
	"and %zu server(s)",		"and %zu server(s)",
	mClientConnections.size(), mServerConnections.size());		mOutgoingConnections.size(), mIncomingConnections.size());
	mMaxThreads = threads;		mMaxThreads = threads;
	}		}

	@@ -100,7 +100,7 @@ bool RpcSession::addNullDebuggingClient() {
	return false;		return false;
	}		}

	return addClientConnection(std::move(serverFd));		return addOutgoingConnection(std::move(serverFd), false);
	}		}

	sp<IBinder> RpcSession::getRootObject() {		sp<IBinder> RpcSession::getRootObject() {
	@@ -108,7 +108,7 @@ sp<IBinder> RpcSession::getRootObject() {
	status_t status = ExclusiveConnection::find(sp<RpcSession>::fromExisting(this),		status_t status = ExclusiveConnection::find(sp<RpcSession>::fromExisting(this),
	ConnectionUse::CLIENT, &connection);		ConnectionUse::CLIENT, &connection);
	if (status != OK) return nullptr;		if (status != OK) return nullptr;
	return state()->getRootObject(connection.fd(), sp<RpcSession>::fromExisting(this));		return state()->getRootObject(connection.get(), sp<RpcSession>::fromExisting(this));
	}		}

	status_t RpcSession::getRemoteMaxThreads(size_t* maxThreads) {		status_t RpcSession::getRemoteMaxThreads(size_t* maxThreads) {
	@@ -116,7 +116,7 @@ status_t RpcSession::getRemoteMaxThreads(size_t* maxThreads) {
	status_t status = ExclusiveConnection::find(sp<RpcSession>::fromExisting(this),		status_t status = ExclusiveConnection::find(sp<RpcSession>::fromExisting(this),
	ConnectionUse::CLIENT, &connection);		ConnectionUse::CLIENT, &connection);
	if (status != OK) return status;		if (status != OK) return status;
	return state()->getMaxThreads(connection.fd(), sp<RpcSession>::fromExisting(this), maxThreads);		return state()->getMaxThreads(connection.get(), sp<RpcSession>::fromExisting(this), maxThreads);
	}		}

	bool RpcSession::shutdownAndWait(bool wait) {		bool RpcSession::shutdownAndWait(bool wait) {
	@@ -146,7 +146,7 @@ status_t RpcSession::transact(const sp<IBinder>& binder, uint32_t code, const Pa
	: ConnectionUse::CLIENT,		: ConnectionUse::CLIENT,
	&connection);		&connection);
	if (status != OK) return status;		if (status != OK) return status;
	return state()->transact(connection.fd(), binder, code, data,		return state()->transact(connection.get(), binder, code, data,
	sp<RpcSession>::fromExisting(this), reply, flags);		sp<RpcSession>::fromExisting(this), reply, flags);
	}		}

	@@ -155,7 +155,7 @@ status_t RpcSession::sendDecStrong(const RpcAddress& address) {
	status_t status = ExclusiveConnection::find(sp<RpcSession>::fromExisting(this),		status_t status = ExclusiveConnection::find(sp<RpcSession>::fromExisting(this),
	ConnectionUse::CLIENT_REFCOUNT, &connection);		ConnectionUse::CLIENT_REFCOUNT, &connection);
	if (status != OK) return status;		if (status != OK) return status;
	return state()->sendDecStrong(connection.fd(), sp<RpcSession>::fromExisting(this), address);		return state()->sendDecStrong(connection.get(), sp<RpcSession>::fromExisting(this), address);
	}		}

	std::unique_ptr<RpcSession::FdTrigger> RpcSession::FdTrigger::make() {		std::unique_ptr<RpcSession::FdTrigger> RpcSession::FdTrigger::make() {
	@@ -218,28 +218,27 @@ status_t RpcSession::readId() {
	LOG_ALWAYS_FATAL_IF(mForServer != nullptr, "Can only update ID for client.");		LOG_ALWAYS_FATAL_IF(mForServer != nullptr, "Can only update ID for client.");
	}		}

	int32_t id;

	ExclusiveConnection connection;		ExclusiveConnection connection;
	status_t status = ExclusiveConnection::find(sp<RpcSession>::fromExisting(this),		status_t status = ExclusiveConnection::find(sp<RpcSession>::fromExisting(this),
	ConnectionUse::CLIENT, &connection);		ConnectionUse::CLIENT, &connection);
	if (status != OK) return status;		if (status != OK) return status;

	status = state()->getSessionId(connection.fd(), sp<RpcSession>::fromExisting(this), &id);		mId = RpcAddress::zero();
			status = state()->getSessionId(connection.get(), sp<RpcSession>::fromExisting(this),
			&mId.value());
	if (status != OK) return status;		if (status != OK) return status;

	LOG_RPC_DETAIL("RpcSession %p has id %d", this, id);		LOG_RPC_DETAIL("RpcSession %p has id %s", this, mId->toString().c_str());
	mId = id;
	return OK;		return OK;
	}		}

	void RpcSession::WaitForShutdownListener::onSessionLockedAllServerThreadsEnded(		void RpcSession::WaitForShutdownListener::onSessionLockedAllIncomingThreadsEnded(
	const sp<RpcSession>& session) {		const sp<RpcSession>& session) {
	(void)session;		(void)session;
	mShutdown = true;		mShutdown = true;
	}		}

	void RpcSession::WaitForShutdownListener::onSessionServerThreadEnded() {		void RpcSession::WaitForShutdownListener::onSessionIncomingThreadEnded() {
	mCv.notify_all();		mCv.notify_all();
	}		}

	@@ -263,10 +262,9 @@ void RpcSession::preJoinThreadOwnership(std::thread thread) {
	RpcSession::PreJoinSetupResult RpcSession::preJoinSetup(base::unique_fd fd) {		RpcSession::PreJoinSetupResult RpcSession::preJoinSetup(base::unique_fd fd) {
	// must be registered to allow arbitrary client code executing commands to		// must be registered to allow arbitrary client code executing commands to
	// be able to do nested calls (we can't only read from it)		// be able to do nested calls (we can't only read from it)
	sp<RpcConnection> connection = assignServerToThisThread(std::move(fd));		sp<RpcConnection> connection = assignIncomingConnectionToThisThread(std::move(fd));

	status_t status =		status_t status = mState->readConnectionInit(connection, sp<RpcSession>::fromExisting(this));
	mState->readConnectionInit(connection->fd, sp<RpcSession>::fromExisting(this));

	return PreJoinSetupResult{		return PreJoinSetupResult{
	.connection = std::move(connection),		.connection = std::move(connection),
	@@ -279,7 +277,7 @@ void RpcSession::join(sp<RpcSession>&& session, PreJoinSetupResult&& setupResult

	if (setupResult.status == OK) {		if (setupResult.status == OK) {
	while (true) {		while (true) {
	status_t status = session->state()->getAndExecuteCommand(connection->fd, session,		status_t status = session->state()->getAndExecuteCommand(connection, session,
	RpcState::CommandType::ANY);		RpcState::CommandType::ANY);
	if (status != OK) {		if (status != OK) {
	LOG_RPC_DETAIL("Binder connection thread closing w/ status %s",		LOG_RPC_DETAIL("Binder connection thread closing w/ status %s",
	@@ -292,7 +290,7 @@ void RpcSession::join(sp<RpcSession>&& session, PreJoinSetupResult&& setupResult
	statusToString(setupResult.status).c_str());		statusToString(setupResult.status).c_str());
	}		}

	LOG_ALWAYS_FATAL_IF(!session->removeServerConnection(connection),		LOG_ALWAYS_FATAL_IF(!session->removeIncomingConnection(connection),
	"bad state: connection object guaranteed to be in list");		"bad state: connection object guaranteed to be in list");

	sp<RpcSession::EventListener> listener;		sp<RpcSession::EventListener> listener;
	@@ -309,23 +307,28 @@ void RpcSession::join(sp<RpcSession>&& session, PreJoinSetupResult&& setupResult
	session = nullptr;		session = nullptr;

	if (listener != nullptr) {		if (listener != nullptr) {
	listener->onSessionServerThreadEnded();		listener->onSessionIncomingThreadEnded();
	}		}
	}		}

	wp<RpcServer> RpcSession::server() {		sp<RpcServer> RpcSession::server() {
	return mForServer;		RpcServer* unsafeServer = mForServer.unsafe_get();
			sp<RpcServer> server = mForServer.promote();

			LOG_ALWAYS_FATAL_IF((unsafeServer == nullptr) != (server == nullptr),
			"wp<> is to avoid strong cycle only");
			return server;
	}		}

	bool RpcSession::setupSocketClient(const RpcSocketAddress& addr) {		bool RpcSession::setupSocketClient(const RpcSocketAddress& addr) {
	{		{
	std::lock_guard<std::mutex> _l(mMutex);		std::lock_guard<std::mutex> _l(mMutex);
	LOG_ALWAYS_FATAL_IF(mClientConnections.size() != 0,		LOG_ALWAYS_FATAL_IF(mOutgoingConnections.size() != 0,
	"Must only setup session once, but already has %zu clients",		"Must only setup session once, but already has %zu clients",
	mClientConnections.size());		mOutgoingConnections.size());
	}		}

	if (!setupOneSocketConnection(addr, RPC_SESSION_ID_NEW, false /reverse/)) return false;		if (!setupOneSocketConnection(addr, RpcAddress::zero(), false /reverse/)) return false;

	// TODO(b/189955605): we should add additional sessions dynamically		// TODO(b/189955605): we should add additional sessions dynamically
	// instead of all at once.		// instead of all at once.
	@@ -362,7 +365,8 @@ bool RpcSession::setupSocketClient(const RpcSocketAddress& addr) {
	return true;		return true;
	}		}

	bool RpcSession::setupOneSocketConnection(const RpcSocketAddress& addr, int32_t id, bool reverse) {		bool RpcSession::setupOneSocketConnection(const RpcSocketAddress& addr, const RpcAddress& id,
			bool reverse) {
	for (size_t tries = 0; tries < 5; tries++) {		for (size_t tries = 0; tries < 5; tries++) {
	if (tries > 0) usleep(10000);		if (tries > 0) usleep(10000);

	@@ -386,9 +390,9 @@ bool RpcSession::setupOneSocketConnection(const RpcSocketAddress& addr, int32_t
	return false;		return false;
	}		}

	RpcConnectionHeader header{		RpcConnectionHeader header{.options = 0};
	.sessionId = id,		memcpy(&header.sessionId, &id.viewRawEmbedded(), sizeof(RpcWireAddress));
	};
	if (reverse) header.options \|= RPC_CONNECTION_OPTION_REVERSE;		if (reverse) header.options \|= RPC_CONNECTION_OPTION_REVERSE;

	if (sizeof(header) != TEMP_FAILURE_RETRY(write(serverFd.get(), &header, sizeof(header)))) {		if (sizeof(header) != TEMP_FAILURE_RETRY(write(serverFd.get(), &header, sizeof(header)))) {
	@@ -428,7 +432,7 @@ bool RpcSession::setupOneSocketConnection(const RpcSocketAddress& addr, int32_t
	LOG_ALWAYS_FATAL_IF(!ownershipTransferred);		LOG_ALWAYS_FATAL_IF(!ownershipTransferred);
	return true;		return true;
	} else {		} else {
	return addClientConnection(std::move(serverFd));		return addOutgoingConnection(std::move(serverFd), true);
	}		}
	}		}

	@@ -436,7 +440,7 @@ bool RpcSession::setupOneSocketConnection(const RpcSocketAddress& addr, int32_t
	return false;		return false;
	}		}

	bool RpcSession::addClientConnection(unique_fd fd) {		bool RpcSession::addOutgoingConnection(unique_fd fd, bool init) {
	sp<RpcConnection> connection = sp<RpcConnection>::make();		sp<RpcConnection> connection = sp<RpcConnection>::make();
	{		{
	std::lock_guard<std::mutex> _l(mMutex);		std::lock_guard<std::mutex> _l(mMutex);
	@@ -451,11 +455,13 @@ bool RpcSession::addClientConnection(unique_fd fd) {

	connection->fd = std::move(fd);		connection->fd = std::move(fd);
	connection->exclusiveTid = gettid();		connection->exclusiveTid = gettid();
	mClientConnections.push_back(connection);		mOutgoingConnections.push_back(connection);
	}		}

	status_t status =		status_t status = OK;
	mState->sendConnectionInit(connection->fd, sp<RpcSession>::fromExisting(this));		if (init) {
			mState->sendConnectionInit(connection, sp<RpcSession>::fromExisting(this));
			}

	{		{
	std::lock_guard<std::mutex> _l(mMutex);		std::lock_guard<std::mutex> _l(mMutex);
	@@ -466,7 +472,7 @@ bool RpcSession::addClientConnection(unique_fd fd) {
	}		}

	bool RpcSession::setForServer(const wp<RpcServer>& server, const wp<EventListener>& eventListener,		bool RpcSession::setForServer(const wp<RpcServer>& server, const wp<EventListener>& eventListener,
	int32_t sessionId) {		const RpcAddress& sessionId) {
	LOG_ALWAYS_FATAL_IF(mForServer != nullptr);		LOG_ALWAYS_FATAL_IF(mForServer != nullptr);
	LOG_ALWAYS_FATAL_IF(server == nullptr);		LOG_ALWAYS_FATAL_IF(server == nullptr);
	LOG_ALWAYS_FATAL_IF(mEventListener != nullptr);		LOG_ALWAYS_FATAL_IF(mEventListener != nullptr);
	@@ -482,25 +488,26 @@ bool RpcSession::setForServer(const wp<RpcServer>& server, const wp<EventListene
	return true;		return true;
	}		}

	sp<RpcSession::RpcConnection> RpcSession::assignServerToThisThread(unique_fd fd) {		sp<RpcSession::RpcConnection> RpcSession::assignIncomingConnectionToThisThread(unique_fd fd) {
	std::lock_guard<std::mutex> _l(mMutex);		std::lock_guard<std::mutex> _l(mMutex);
	sp<RpcConnection> session = sp<RpcConnection>::make();		sp<RpcConnection> session = sp<RpcConnection>::make();
	session->fd = std::move(fd);		session->fd = std::move(fd);
	session->exclusiveTid = gettid();		session->exclusiveTid = gettid();
	mServerConnections.push_back(session);		mIncomingConnections.push_back(session);

	return session;		return session;
	}		}

	bool RpcSession::removeServerConnection(const sp<RpcConnection>& connection) {		bool RpcSession::removeIncomingConnection(const sp<RpcConnection>& connection) {
	std::lock_guard<std::mutex> _l(mMutex);		std::lock_guard<std::mutex> _l(mMutex);
	if (auto it = std::find(mServerConnections.begin(), mServerConnections.end(), connection);		if (auto it = std::find(mIncomingConnections.begin(), mIncomingConnections.end(), connection);
	it != mServerConnections.end()) {		it != mIncomingConnections.end()) {
	mServerConnections.erase(it);		mIncomingConnections.erase(it);
	if (mServerConnections.size() == 0) {		if (mIncomingConnections.size() == 0) {
	sp<EventListener> listener = mEventListener.promote();		sp<EventListener> listener = mEventListener.promote();
	if (listener) {		if (listener) {
	listener->onSessionLockedAllServerThreadsEnded(sp<RpcSession>::fromExisting(this));		listener->onSessionLockedAllIncomingThreadsEnded(
			sp<RpcSession>::fromExisting(this));
	}		}
	}		}
	return true;		return true;
	@@ -525,11 +532,11 @@ status_t RpcSession::ExclusiveConnection::find(const sp<RpcSession>& session, Co
	// CHECK FOR DEDICATED CLIENT SOCKET		// CHECK FOR DEDICATED CLIENT SOCKET
	//		//
	// A server/looper should always use a dedicated connection if available		// A server/looper should always use a dedicated connection if available
	findConnection(tid, &exclusive, &available, session->mClientConnections,		findConnection(tid, &exclusive, &available, session->mOutgoingConnections,
	session->mClientConnectionsOffset);		session->mOutgoingConnectionsOffset);

	// WARNING: this assumes a server cannot request its client to send		// WARNING: this assumes a server cannot request its client to send
	// a transaction, as mServerConnections is excluded below.		// a transaction, as mIncomingConnections is excluded below.
	//		//
	// Imagine we have more than one thread in play, and a single thread		// Imagine we have more than one thread in play, and a single thread
	// sends a synchronous, then an asynchronous command. Imagine the		// sends a synchronous, then an asynchronous command. Imagine the
	@@ -539,17 +546,31 @@ status_t RpcSession::ExclusiveConnection::find(const sp<RpcSession>& session, Co
	// command. So, we move to considering the second available thread		// command. So, we move to considering the second available thread
	// for subsequent calls.		// for subsequent calls.
	if (use == ConnectionUse::CLIENT_ASYNC && (exclusive != nullptr \|\| available != nullptr)) {		if (use == ConnectionUse::CLIENT_ASYNC && (exclusive != nullptr \|\| available != nullptr)) {
	session->mClientConnectionsOffset =		session->mOutgoingConnectionsOffset = (session->mOutgoingConnectionsOffset + 1) %
	(session->mClientConnectionsOffset + 1) % session->mClientConnections.size();		session->mOutgoingConnections.size();
	}		}

	// USE SERVING SOCKET (for nested transaction)		// USE SERVING SOCKET (e.g. nested transaction)
	//
	// asynchronous calls cannot be nested
	if (use != ConnectionUse::CLIENT_ASYNC) {		if (use != ConnectionUse::CLIENT_ASYNC) {
			sp<RpcConnection> exclusiveIncoming;
	// server connections are always assigned to a thread		// server connections are always assigned to a thread
	findConnection(tid, &exclusive, nullptr /available/, session->mServerConnections,		findConnection(tid, &exclusiveIncoming, nullptr /available/,
	0 /* index hint */);		session->mIncomingConnections, 0 /* index hint */);

			// asynchronous calls cannot be nested, we currently allow ref count
			// calls to be nested (so that you can use this without having extra
			// threads). Note 'drainCommands' is used so that these ref counts can't
			// build up.
			if (exclusiveIncoming != nullptr) {
			if (exclusiveIncoming->allowNested) {
			// guaranteed to be processed as nested command
			exclusive = exclusiveIncoming;
			} else if (use == ConnectionUse::CLIENT_REFCOUNT && available == nullptr) {
			// prefer available socket, but if we don't have one, don't
			// wait for one
			exclusive = exclusiveIncoming;
			}
			}
	}		}

	// if our thread is already using a connection, prioritize using that		// if our thread is already using a connection, prioritize using that
	@@ -563,16 +584,16 @@ status_t RpcSession::ExclusiveConnection::find(const sp<RpcSession>& session, Co
	break;		break;
	}		}

	if (session->mClientConnections.size() == 0) {		if (session->mOutgoingConnections.size() == 0) {
	ALOGE("Session has no client connections. This is required for an RPC server to make "		ALOGE("Session has no client connections. This is required for an RPC server to make "
	"any non-nested (e.g. oneway or on another thread) calls. Use: %d. Server "		"any non-nested (e.g. oneway or on another thread) calls. Use: %d. Server "
	"connections: %zu",		"connections: %zu",
	static_cast<int>(use), session->mServerConnections.size());		static_cast<int>(use), session->mIncomingConnections.size());
	return WOULD_BLOCK;		return WOULD_BLOCK;
	}		}

	LOG_RPC_DETAIL("No available connections (have %zu clients and %zu servers). Waiting...",		LOG_RPC_DETAIL("No available connections (have %zu clients and %zu servers). Waiting...",
	session->mClientConnections.size(), session->mServerConnections.size());		session->mOutgoingConnections.size(), session->mIncomingConnections.size());
	session->mAvailableConnectionCv.wait(_l);		session->mAvailableConnectionCv.wait(_l);
	}		}
	session->mWaitingThreads--;		session->mWaitingThreads--;

libs/binder/RpcState.cpp

+143 −94

File changed.

Preview size limit exceeded, changes collapsed.

libs/binder/RpcState.h

+38 −32

Original line number	Original line	Diff line number	Diff line
	@@ -51,34 +51,37 @@ public:
	RpcState();		RpcState();
	~RpcState();		~RpcState();

	status_t sendConnectionInit(const base::unique_fd& fd, const sp<RpcSession>& session);		status_t sendConnectionInit(const sp<RpcSession::RpcConnection>& connection,
	status_t readConnectionInit(const base::unique_fd& fd, const sp<RpcSession>& session);		const sp<RpcSession>& session);
			status_t readConnectionInit(const sp<RpcSession::RpcConnection>& connection,
			const sp<RpcSession>& session);

	// TODO(b/182940634): combine some special transactions into one "getServerInfo" call?		// TODO(b/182940634): combine some special transactions into one "getServerInfo" call?
	sp<IBinder> getRootObject(const base::unique_fd& fd, const sp<RpcSession>& session);		sp<IBinder> getRootObject(const sp<RpcSession::RpcConnection>& connection,
	status_t getMaxThreads(const base::unique_fd& fd, const sp<RpcSession>& session,		const sp<RpcSession>& session);
	size_t* maxThreadsOut);		status_t getMaxThreads(const sp<RpcSession::RpcConnection>& connection,
	status_t getSessionId(const base::unique_fd& fd, const sp<RpcSession>& session,		const sp<RpcSession>& session, size_t* maxThreadsOut);
	int32_t* sessionIdOut);		status_t getSessionId(const sp<RpcSession::RpcConnection>& connection,
			const sp<RpcSession>& session, RpcAddress* sessionIdOut);
	[[nodiscard]] status_t transact(const base::unique_fd& fd, const sp<IBinder>& address,
	uint32_t code, const Parcel& data,		[[nodiscard]] status_t transact(const sp<RpcSession::RpcConnection>& connection,
			const sp<IBinder>& address, uint32_t code, const Parcel& data,
	const sp<RpcSession>& session, Parcel* reply, uint32_t flags);		const sp<RpcSession>& session, Parcel* reply, uint32_t flags);
	[[nodiscard]] status_t transactAddress(const base::unique_fd& fd, const RpcAddress& address,		[[nodiscard]] status_t transactAddress(const sp<RpcSession::RpcConnection>& connection,
	uint32_t code, const Parcel& data,		const RpcAddress& address, uint32_t code,
	const sp<RpcSession>& session, Parcel* reply,		const Parcel& data, const sp<RpcSession>& session,
	uint32_t flags);		Parcel* reply, uint32_t flags);
	[[nodiscard]] status_t sendDecStrong(const base::unique_fd& fd, const sp<RpcSession>& session,		[[nodiscard]] status_t sendDecStrong(const sp<RpcSession::RpcConnection>& connection,
	const RpcAddress& address);		const sp<RpcSession>& session, const RpcAddress& address);

	enum class CommandType {		enum class CommandType {
	ANY,		ANY,
	CONTROL_ONLY,		CONTROL_ONLY,
	};		};
	[[nodiscard]] status_t getAndExecuteCommand(const base::unique_fd& fd,		[[nodiscard]] status_t getAndExecuteCommand(const sp<RpcSession::RpcConnection>& connection,
			const sp<RpcSession>& session, CommandType type);
			[[nodiscard]] status_t drainCommands(const sp<RpcSession::RpcConnection>& connection,
	const sp<RpcSession>& session, CommandType type);		const sp<RpcSession>& session, CommandType type);
	[[nodiscard]] status_t drainCommands(const base::unique_fd& fd, const sp<RpcSession>& session,
	CommandType type);

	/**		/**
	* Called by Parcel for outgoing binders. This implies one refcount of		* Called by Parcel for outgoing binders. This implies one refcount of
	@@ -133,22 +136,25 @@ private:
	size_t mSize;		size_t mSize;
	};		};

	[[nodiscard]] status_t rpcSend(const base::unique_fd& fd, const sp<RpcSession>& session,		[[nodiscard]] status_t rpcSend(const sp<RpcSession::RpcConnection>& connection,
	const char* what, const void* data, size_t size);		const sp<RpcSession>& session, const char* what,
	[[nodiscard]] status_t rpcRec(const base::unique_fd& fd, const sp<RpcSession>& session,		const void* data, size_t size);
	const char* what, void* data, size_t size);		[[nodiscard]] status_t rpcRec(const sp<RpcSession::RpcConnection>& connection,
			const sp<RpcSession>& session, const char* what, void* data,
			size_t size);

	[[nodiscard]] status_t waitForReply(const base::unique_fd& fd, const sp<RpcSession>& session,		[[nodiscard]] status_t waitForReply(const sp<RpcSession::RpcConnection>& connection,
	Parcel* reply);		const sp<RpcSession>& session, Parcel* reply);
	[[nodiscard]] status_t processServerCommand(const base::unique_fd& fd,		[[nodiscard]] status_t processCommand(const sp<RpcSession::RpcConnection>& connection,
	const sp<RpcSession>& session,		const sp<RpcSession>& session,
	const RpcWireHeader& command, CommandType type);		const RpcWireHeader& command, CommandType type);
	[[nodiscard]] status_t processTransact(const base::unique_fd& fd, const sp<RpcSession>& session,		[[nodiscard]] status_t processTransact(const sp<RpcSession::RpcConnection>& connection,
			const sp<RpcSession>& session,
	const RpcWireHeader& command);		const RpcWireHeader& command);
	[[nodiscard]] status_t processTransactInternal(const base::unique_fd& fd,		[[nodiscard]] status_t processTransactInternal(const sp<RpcSession::RpcConnection>& connection,
	const sp<RpcSession>& session,		const sp<RpcSession>& session,
	CommandData transactionData);		CommandData transactionData);
	[[nodiscard]] status_t processDecStrong(const base::unique_fd& fd,		[[nodiscard]] status_t processDecStrong(const sp<RpcSession::RpcConnection>& connection,
	const sp<RpcSession>& session,		const sp<RpcSession>& session,
	const RpcWireHeader& command);		const RpcWireHeader& command);